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Diffstat (limited to 'mesalib/src/mesa/main/light.c')
-rw-r--r--mesalib/src/mesa/main/light.c2863
1 files changed, 1433 insertions, 1430 deletions
diff --git a/mesalib/src/mesa/main/light.c b/mesalib/src/mesa/main/light.c
index 888e5622e..60daa89a3 100644
--- a/mesalib/src/mesa/main/light.c
+++ b/mesalib/src/mesa/main/light.c
@@ -1,1430 +1,1433 @@
-/*
- * Mesa 3-D graphics library
- * Version: 7.5
- *
- * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
- * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-#include "glheader.h"
-#include "imports.h"
-#include "context.h"
-#include "enums.h"
-#include "light.h"
-#include "macros.h"
-#include "simple_list.h"
-#include "mtypes.h"
-#include "math/m_matrix.h"
-
-
-void GLAPIENTRY
-_mesa_ShadeModel( GLenum mode )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glShadeModel %s\n", _mesa_lookup_enum_by_nr(mode));
-
- if (mode != GL_FLAT && mode != GL_SMOOTH) {
- _mesa_error(ctx, GL_INVALID_ENUM, "glShadeModel");
- return;
- }
-
- if (ctx->Light.ShadeModel == mode)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- ctx->Light.ShadeModel = mode;
- if (mode == GL_FLAT)
- ctx->_TriangleCaps |= DD_FLATSHADE;
- else
- ctx->_TriangleCaps &= ~DD_FLATSHADE;
-
- if (ctx->Driver.ShadeModel)
- ctx->Driver.ShadeModel( ctx, mode );
-}
-
-
-/**
- * Set the provoking vertex (the vertex which specifies the prim's
- * color when flat shading) to either the first or last vertex of the
- * triangle or line.
- */
-void GLAPIENTRY
-_mesa_ProvokingVertexEXT(GLenum mode)
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE&VERBOSE_API)
- _mesa_debug(ctx, "glProvokingVertexEXT 0x%x\n", mode);
-
- switch (mode) {
- case GL_FIRST_VERTEX_CONVENTION_EXT:
- case GL_LAST_VERTEX_CONVENTION_EXT:
- break;
- default:
- _mesa_error(ctx, GL_INVALID_ENUM, "glProvokingVertexEXT(0x%x)", mode);
- return;
- }
-
- if (ctx->Light.ProvokingVertex == mode)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- ctx->Light.ProvokingVertex = mode;
-}
-
-
-/**
- * Helper function called by _mesa_Lightfv and _mesa_PopAttrib to set
- * per-light state.
- * For GL_POSITION and GL_SPOT_DIRECTION the params position/direction
- * will have already been transformed by the modelview matrix!
- * Also, all error checking should have already been done.
- */
-void
-_mesa_light(struct gl_context *ctx, GLuint lnum, GLenum pname, const GLfloat *params)
-{
- struct gl_light *light;
-
- ASSERT(lnum < MAX_LIGHTS);
- light = &ctx->Light.Light[lnum];
-
- switch (pname) {
- case GL_AMBIENT:
- if (TEST_EQ_4V(light->Ambient, params))
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- COPY_4V( light->Ambient, params );
- break;
- case GL_DIFFUSE:
- if (TEST_EQ_4V(light->Diffuse, params))
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- COPY_4V( light->Diffuse, params );
- break;
- case GL_SPECULAR:
- if (TEST_EQ_4V(light->Specular, params))
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- COPY_4V( light->Specular, params );
- break;
- case GL_POSITION:
- /* NOTE: position has already been transformed by ModelView! */
- if (TEST_EQ_4V(light->EyePosition, params))
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- COPY_4V(light->EyePosition, params);
- if (light->EyePosition[3] != 0.0F)
- light->_Flags |= LIGHT_POSITIONAL;
- else
- light->_Flags &= ~LIGHT_POSITIONAL;
- break;
- case GL_SPOT_DIRECTION:
- /* NOTE: Direction already transformed by inverse ModelView! */
- if (TEST_EQ_3V(light->SpotDirection, params))
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- COPY_3V(light->SpotDirection, params);
- break;
- case GL_SPOT_EXPONENT:
- ASSERT(params[0] >= 0.0);
- ASSERT(params[0] <= ctx->Const.MaxSpotExponent);
- if (light->SpotExponent == params[0])
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- light->SpotExponent = params[0];
- _mesa_invalidate_spot_exp_table(light);
- break;
- case GL_SPOT_CUTOFF:
- ASSERT(params[0] == 180.0 || (params[0] >= 0.0 && params[0] <= 90.0));
- if (light->SpotCutoff == params[0])
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- light->SpotCutoff = params[0];
- light->_CosCutoffNeg = (GLfloat) (cos(light->SpotCutoff * DEG2RAD));
- if (light->_CosCutoffNeg < 0)
- light->_CosCutoff = 0;
- else
- light->_CosCutoff = light->_CosCutoffNeg;
- if (light->SpotCutoff != 180.0F)
- light->_Flags |= LIGHT_SPOT;
- else
- light->_Flags &= ~LIGHT_SPOT;
- break;
- case GL_CONSTANT_ATTENUATION:
- ASSERT(params[0] >= 0.0);
- if (light->ConstantAttenuation == params[0])
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- light->ConstantAttenuation = params[0];
- break;
- case GL_LINEAR_ATTENUATION:
- ASSERT(params[0] >= 0.0);
- if (light->LinearAttenuation == params[0])
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- light->LinearAttenuation = params[0];
- break;
- case GL_QUADRATIC_ATTENUATION:
- ASSERT(params[0] >= 0.0);
- if (light->QuadraticAttenuation == params[0])
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- light->QuadraticAttenuation = params[0];
- break;
- default:
- _mesa_problem(ctx, "Unexpected pname in _mesa_light()");
- return;
- }
-
- if (ctx->Driver.Lightfv)
- ctx->Driver.Lightfv( ctx, GL_LIGHT0 + lnum, pname, params );
-}
-
-
-void GLAPIENTRY
-_mesa_Lightf( GLenum light, GLenum pname, GLfloat param )
-{
- GLfloat fparam[4];
- fparam[0] = param;
- fparam[1] = fparam[2] = fparam[3] = 0.0F;
- _mesa_Lightfv( light, pname, fparam );
-}
-
-
-void GLAPIENTRY
-_mesa_Lightfv( GLenum light, GLenum pname, const GLfloat *params )
-{
- GET_CURRENT_CONTEXT(ctx);
- GLint i = (GLint) (light - GL_LIGHT0);
- GLfloat temp[4];
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (i < 0 || i >= (GLint) ctx->Const.MaxLights) {
- _mesa_error( ctx, GL_INVALID_ENUM, "glLight(light=0x%x)", light );
- return;
- }
-
- /* do particular error checks, transformations */
- switch (pname) {
- case GL_AMBIENT:
- case GL_DIFFUSE:
- case GL_SPECULAR:
- /* nothing */
- break;
- case GL_POSITION:
- /* transform position by ModelView matrix */
- TRANSFORM_POINT(temp, ctx->ModelviewMatrixStack.Top->m, params);
- params = temp;
- break;
- case GL_SPOT_DIRECTION:
- /* transform direction by inverse modelview */
- if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {
- _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
- }
- TRANSFORM_DIRECTION(temp, params, ctx->ModelviewMatrixStack.Top->m);
- params = temp;
- break;
- case GL_SPOT_EXPONENT:
- if (params[0] < 0.0 || params[0] > ctx->Const.MaxSpotExponent) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
- return;
- }
- break;
- case GL_SPOT_CUTOFF:
- if ((params[0] < 0.0 || params[0] > 90.0) && params[0] != 180.0) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
- return;
- }
- break;
- case GL_CONSTANT_ATTENUATION:
- if (params[0] < 0.0) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
- return;
- }
- break;
- case GL_LINEAR_ATTENUATION:
- if (params[0] < 0.0) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
- return;
- }
- break;
- case GL_QUADRATIC_ATTENUATION:
- if (params[0] < 0.0) {
- _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
- return;
- }
- break;
- default:
- _mesa_error(ctx, GL_INVALID_ENUM, "glLight(pname=0x%x)", pname);
- return;
- }
-
- _mesa_light(ctx, i, pname, params);
-}
-
-
-void GLAPIENTRY
-_mesa_Lighti( GLenum light, GLenum pname, GLint param )
-{
- GLint iparam[4];
- iparam[0] = param;
- iparam[1] = iparam[2] = iparam[3] = 0;
- _mesa_Lightiv( light, pname, iparam );
-}
-
-
-void GLAPIENTRY
-_mesa_Lightiv( GLenum light, GLenum pname, const GLint *params )
-{
- GLfloat fparam[4];
-
- switch (pname) {
- case GL_AMBIENT:
- case GL_DIFFUSE:
- case GL_SPECULAR:
- fparam[0] = INT_TO_FLOAT( params[0] );
- fparam[1] = INT_TO_FLOAT( params[1] );
- fparam[2] = INT_TO_FLOAT( params[2] );
- fparam[3] = INT_TO_FLOAT( params[3] );
- break;
- case GL_POSITION:
- fparam[0] = (GLfloat) params[0];
- fparam[1] = (GLfloat) params[1];
- fparam[2] = (GLfloat) params[2];
- fparam[3] = (GLfloat) params[3];
- break;
- case GL_SPOT_DIRECTION:
- fparam[0] = (GLfloat) params[0];
- fparam[1] = (GLfloat) params[1];
- fparam[2] = (GLfloat) params[2];
- break;
- case GL_SPOT_EXPONENT:
- case GL_SPOT_CUTOFF:
- case GL_CONSTANT_ATTENUATION:
- case GL_LINEAR_ATTENUATION:
- case GL_QUADRATIC_ATTENUATION:
- fparam[0] = (GLfloat) params[0];
- break;
- default:
- /* error will be caught later in gl_Lightfv */
- ;
- }
-
- _mesa_Lightfv( light, pname, fparam );
-}
-
-
-
-void GLAPIENTRY
-_mesa_GetLightfv( GLenum light, GLenum pname, GLfloat *params )
-{
- GET_CURRENT_CONTEXT(ctx);
- GLint l = (GLint) (light - GL_LIGHT0);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (l < 0 || l >= (GLint) ctx->Const.MaxLights) {
- _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
- return;
- }
-
- switch (pname) {
- case GL_AMBIENT:
- COPY_4V( params, ctx->Light.Light[l].Ambient );
- break;
- case GL_DIFFUSE:
- COPY_4V( params, ctx->Light.Light[l].Diffuse );
- break;
- case GL_SPECULAR:
- COPY_4V( params, ctx->Light.Light[l].Specular );
- break;
- case GL_POSITION:
- COPY_4V( params, ctx->Light.Light[l].EyePosition );
- break;
- case GL_SPOT_DIRECTION:
- COPY_3V( params, ctx->Light.Light[l].SpotDirection );
- break;
- case GL_SPOT_EXPONENT:
- params[0] = ctx->Light.Light[l].SpotExponent;
- break;
- case GL_SPOT_CUTOFF:
- params[0] = ctx->Light.Light[l].SpotCutoff;
- break;
- case GL_CONSTANT_ATTENUATION:
- params[0] = ctx->Light.Light[l].ConstantAttenuation;
- break;
- case GL_LINEAR_ATTENUATION:
- params[0] = ctx->Light.Light[l].LinearAttenuation;
- break;
- case GL_QUADRATIC_ATTENUATION:
- params[0] = ctx->Light.Light[l].QuadraticAttenuation;
- break;
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
- break;
- }
-}
-
-
-void GLAPIENTRY
-_mesa_GetLightiv( GLenum light, GLenum pname, GLint *params )
-{
- GET_CURRENT_CONTEXT(ctx);
- GLint l = (GLint) (light - GL_LIGHT0);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (l < 0 || l >= (GLint) ctx->Const.MaxLights) {
- _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
- return;
- }
-
- switch (pname) {
- case GL_AMBIENT:
- params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[0]);
- params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[1]);
- params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[2]);
- params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[3]);
- break;
- case GL_DIFFUSE:
- params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[0]);
- params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[1]);
- params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[2]);
- params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[3]);
- break;
- case GL_SPECULAR:
- params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[0]);
- params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[1]);
- params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[2]);
- params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[3]);
- break;
- case GL_POSITION:
- params[0] = (GLint) ctx->Light.Light[l].EyePosition[0];
- params[1] = (GLint) ctx->Light.Light[l].EyePosition[1];
- params[2] = (GLint) ctx->Light.Light[l].EyePosition[2];
- params[3] = (GLint) ctx->Light.Light[l].EyePosition[3];
- break;
- case GL_SPOT_DIRECTION:
- params[0] = (GLint) ctx->Light.Light[l].SpotDirection[0];
- params[1] = (GLint) ctx->Light.Light[l].SpotDirection[1];
- params[2] = (GLint) ctx->Light.Light[l].SpotDirection[2];
- break;
- case GL_SPOT_EXPONENT:
- params[0] = (GLint) ctx->Light.Light[l].SpotExponent;
- break;
- case GL_SPOT_CUTOFF:
- params[0] = (GLint) ctx->Light.Light[l].SpotCutoff;
- break;
- case GL_CONSTANT_ATTENUATION:
- params[0] = (GLint) ctx->Light.Light[l].ConstantAttenuation;
- break;
- case GL_LINEAR_ATTENUATION:
- params[0] = (GLint) ctx->Light.Light[l].LinearAttenuation;
- break;
- case GL_QUADRATIC_ATTENUATION:
- params[0] = (GLint) ctx->Light.Light[l].QuadraticAttenuation;
- break;
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
- break;
- }
-}
-
-
-
-/**********************************************************************/
-/*** Light Model ***/
-/**********************************************************************/
-
-
-void GLAPIENTRY
-_mesa_LightModelfv( GLenum pname, const GLfloat *params )
-{
- GLenum newenum;
- GLboolean newbool;
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- switch (pname) {
- case GL_LIGHT_MODEL_AMBIENT:
- if (TEST_EQ_4V( ctx->Light.Model.Ambient, params ))
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- COPY_4V( ctx->Light.Model.Ambient, params );
- break;
- case GL_LIGHT_MODEL_LOCAL_VIEWER:
- newbool = (params[0]!=0.0);
- if (ctx->Light.Model.LocalViewer == newbool)
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- ctx->Light.Model.LocalViewer = newbool;
- break;
- case GL_LIGHT_MODEL_TWO_SIDE:
- newbool = (params[0]!=0.0);
- if (ctx->Light.Model.TwoSide == newbool)
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- ctx->Light.Model.TwoSide = newbool;
- if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
- ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
- else
- ctx->_TriangleCaps &= ~DD_TRI_LIGHT_TWOSIDE;
- break;
- case GL_LIGHT_MODEL_COLOR_CONTROL:
- if (params[0] == (GLfloat) GL_SINGLE_COLOR)
- newenum = GL_SINGLE_COLOR;
- else if (params[0] == (GLfloat) GL_SEPARATE_SPECULAR_COLOR)
- newenum = GL_SEPARATE_SPECULAR_COLOR;
- else {
- _mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(param=0x0%x)",
- (GLint) params[0] );
- return;
- }
- if (ctx->Light.Model.ColorControl == newenum)
- return;
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- ctx->Light.Model.ColorControl = newenum;
- break;
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(pname=0x%x)", pname );
- break;
- }
-
- if (ctx->Driver.LightModelfv)
- ctx->Driver.LightModelfv( ctx, pname, params );
-}
-
-
-void GLAPIENTRY
-_mesa_LightModeliv( GLenum pname, const GLint *params )
-{
- GLfloat fparam[4];
-
- switch (pname) {
- case GL_LIGHT_MODEL_AMBIENT:
- fparam[0] = INT_TO_FLOAT( params[0] );
- fparam[1] = INT_TO_FLOAT( params[1] );
- fparam[2] = INT_TO_FLOAT( params[2] );
- fparam[3] = INT_TO_FLOAT( params[3] );
- break;
- case GL_LIGHT_MODEL_LOCAL_VIEWER:
- case GL_LIGHT_MODEL_TWO_SIDE:
- case GL_LIGHT_MODEL_COLOR_CONTROL:
- fparam[0] = (GLfloat) params[0];
- break;
- default:
- /* Error will be caught later in gl_LightModelfv */
- ASSIGN_4V(fparam, 0.0F, 0.0F, 0.0F, 0.0F);
- }
- _mesa_LightModelfv( pname, fparam );
-}
-
-
-void GLAPIENTRY
-_mesa_LightModeli( GLenum pname, GLint param )
-{
- GLint iparam[4];
- iparam[0] = param;
- iparam[1] = iparam[2] = iparam[3] = 0;
- _mesa_LightModeliv( pname, iparam );
-}
-
-
-void GLAPIENTRY
-_mesa_LightModelf( GLenum pname, GLfloat param )
-{
- GLfloat fparam[4];
- fparam[0] = param;
- fparam[1] = fparam[2] = fparam[3] = 0.0F;
- _mesa_LightModelfv( pname, fparam );
-}
-
-
-
-/********** MATERIAL **********/
-
-
-/*
- * Given a face and pname value (ala glColorMaterial), compute a bitmask
- * of the targeted material values.
- */
-GLuint
-_mesa_material_bitmask( struct gl_context *ctx, GLenum face, GLenum pname,
- GLuint legal, const char *where )
-{
- GLuint bitmask = 0;
-
- /* Make a bitmask indicating what material attribute(s) we're updating */
- switch (pname) {
- case GL_EMISSION:
- bitmask |= MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION;
- break;
- case GL_AMBIENT:
- bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
- break;
- case GL_DIFFUSE:
- bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
- break;
- case GL_SPECULAR:
- bitmask |= MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR;
- break;
- case GL_SHININESS:
- bitmask |= MAT_BIT_FRONT_SHININESS | MAT_BIT_BACK_SHININESS;
- break;
- case GL_AMBIENT_AND_DIFFUSE:
- bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
- bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
- break;
- case GL_COLOR_INDEXES:
- bitmask |= MAT_BIT_FRONT_INDEXES | MAT_BIT_BACK_INDEXES;
- break;
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
- return 0;
- }
-
- if (face==GL_FRONT) {
- bitmask &= FRONT_MATERIAL_BITS;
- }
- else if (face==GL_BACK) {
- bitmask &= BACK_MATERIAL_BITS;
- }
- else if (face != GL_FRONT_AND_BACK) {
- _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
- return 0;
- }
-
- if (bitmask & ~legal) {
- _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
- return 0;
- }
-
- return bitmask;
-}
-
-
-
-/* Perform a straight copy between materials.
- */
-void
-_mesa_copy_materials( struct gl_material *dst,
- const struct gl_material *src,
- GLuint bitmask )
-{
- int i;
-
- for (i = 0 ; i < MAT_ATTRIB_MAX ; i++)
- if (bitmask & (1<<i))
- COPY_4FV( dst->Attrib[i], src->Attrib[i] );
-}
-
-
-
-/* Update derived values following a change in ctx->Light.Material
- */
-void
-_mesa_update_material( struct gl_context *ctx, GLuint bitmask )
-{
- struct gl_light *light, *list = &ctx->Light.EnabledList;
- GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
-
- if (MESA_VERBOSE & VERBOSE_MATERIAL)
- _mesa_debug(ctx, "_mesa_update_material, mask 0x%x\n", bitmask);
-
- if (!bitmask)
- return;
-
- /* update material ambience */
- if (bitmask & MAT_BIT_FRONT_AMBIENT) {
- foreach (light, list) {
- SCALE_3V( light->_MatAmbient[0], light->Ambient,
- mat[MAT_ATTRIB_FRONT_AMBIENT]);
- }
- }
-
- if (bitmask & MAT_BIT_BACK_AMBIENT) {
- foreach (light, list) {
- SCALE_3V( light->_MatAmbient[1], light->Ambient,
- mat[MAT_ATTRIB_BACK_AMBIENT]);
- }
- }
-
- /* update BaseColor = emission + scene's ambience * material's ambience */
- if (bitmask & (MAT_BIT_FRONT_EMISSION | MAT_BIT_FRONT_AMBIENT)) {
- COPY_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_EMISSION] );
- ACC_SCALE_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_AMBIENT],
- ctx->Light.Model.Ambient );
- }
-
- if (bitmask & (MAT_BIT_BACK_EMISSION | MAT_BIT_BACK_AMBIENT)) {
- COPY_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_EMISSION] );
- ACC_SCALE_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_AMBIENT],
- ctx->Light.Model.Ambient );
- }
-
- /* update material diffuse values */
- if (bitmask & MAT_BIT_FRONT_DIFFUSE) {
- foreach (light, list) {
- SCALE_3V( light->_MatDiffuse[0], light->Diffuse,
- mat[MAT_ATTRIB_FRONT_DIFFUSE] );
- }
- }
-
- if (bitmask & MAT_BIT_BACK_DIFFUSE) {
- foreach (light, list) {
- SCALE_3V( light->_MatDiffuse[1], light->Diffuse,
- mat[MAT_ATTRIB_BACK_DIFFUSE] );
- }
- }
-
- /* update material specular values */
- if (bitmask & MAT_BIT_FRONT_SPECULAR) {
- foreach (light, list) {
- SCALE_3V( light->_MatSpecular[0], light->Specular,
- mat[MAT_ATTRIB_FRONT_SPECULAR]);
- }
- }
-
- if (bitmask & MAT_BIT_BACK_SPECULAR) {
- foreach (light, list) {
- SCALE_3V( light->_MatSpecular[1], light->Specular,
- mat[MAT_ATTRIB_BACK_SPECULAR]);
- }
- }
-
- if (bitmask & MAT_BIT_FRONT_SHININESS) {
- _mesa_invalidate_shine_table( ctx, 0 );
- }
-
- if (bitmask & MAT_BIT_BACK_SHININESS) {
- _mesa_invalidate_shine_table( ctx, 1 );
- }
-}
-
-
-/*
- * Update the current materials from the given rgba color
- * according to the bitmask in ColorMaterialBitmask, which is
- * set by glColorMaterial().
- */
-void
-_mesa_update_color_material( struct gl_context *ctx, const GLfloat color[4] )
-{
- GLuint bitmask = ctx->Light.ColorMaterialBitmask;
- struct gl_material *mat = &ctx->Light.Material;
- int i;
-
- for (i = 0 ; i < MAT_ATTRIB_MAX ; i++)
- if (bitmask & (1<<i))
- COPY_4FV( mat->Attrib[i], color );
-
- _mesa_update_material( ctx, bitmask );
-}
-
-
-void GLAPIENTRY
-_mesa_ColorMaterial( GLenum face, GLenum mode )
-{
- GET_CURRENT_CONTEXT(ctx);
- GLuint bitmask;
- GLuint legal = (MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION |
- MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR |
- MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE |
- MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE&VERBOSE_API)
- _mesa_debug(ctx, "glColorMaterial %s %s\n",
- _mesa_lookup_enum_by_nr(face),
- _mesa_lookup_enum_by_nr(mode));
-
- bitmask = _mesa_material_bitmask(ctx, face, mode, legal, "glColorMaterial");
-
- if (ctx->Light.ColorMaterialBitmask == bitmask &&
- ctx->Light.ColorMaterialFace == face &&
- ctx->Light.ColorMaterialMode == mode)
- return;
-
- FLUSH_VERTICES(ctx, _NEW_LIGHT);
- ctx->Light.ColorMaterialBitmask = bitmask;
- ctx->Light.ColorMaterialFace = face;
- ctx->Light.ColorMaterialMode = mode;
-
- if (ctx->Light.ColorMaterialEnabled) {
- FLUSH_CURRENT( ctx, 0 );
- _mesa_update_color_material(ctx,ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
- }
-
- if (ctx->Driver.ColorMaterial)
- ctx->Driver.ColorMaterial( ctx, face, mode );
-}
-
-
-void GLAPIENTRY
-_mesa_GetMaterialfv( GLenum face, GLenum pname, GLfloat *params )
-{
- GET_CURRENT_CONTEXT(ctx);
- GLuint f;
- GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* update materials */
-
- FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
-
- if (face==GL_FRONT) {
- f = 0;
- }
- else if (face==GL_BACK) {
- f = 1;
- }
- else {
- _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(face)" );
- return;
- }
-
- switch (pname) {
- case GL_AMBIENT:
- COPY_4FV( params, mat[MAT_ATTRIB_AMBIENT(f)] );
- break;
- case GL_DIFFUSE:
- COPY_4FV( params, mat[MAT_ATTRIB_DIFFUSE(f)] );
- break;
- case GL_SPECULAR:
- COPY_4FV( params, mat[MAT_ATTRIB_SPECULAR(f)] );
- break;
- case GL_EMISSION:
- COPY_4FV( params, mat[MAT_ATTRIB_EMISSION(f)] );
- break;
- case GL_SHININESS:
- *params = mat[MAT_ATTRIB_SHININESS(f)][0];
- break;
- case GL_COLOR_INDEXES:
- params[0] = mat[MAT_ATTRIB_INDEXES(f)][0];
- params[1] = mat[MAT_ATTRIB_INDEXES(f)][1];
- params[2] = mat[MAT_ATTRIB_INDEXES(f)][2];
- break;
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
- }
-}
-
-
-void GLAPIENTRY
-_mesa_GetMaterialiv( GLenum face, GLenum pname, GLint *params )
-{
- GET_CURRENT_CONTEXT(ctx);
- GLuint f;
- GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* update materials */
-
- FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
-
- if (face==GL_FRONT) {
- f = 0;
- }
- else if (face==GL_BACK) {
- f = 1;
- }
- else {
- _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialiv(face)" );
- return;
- }
- switch (pname) {
- case GL_AMBIENT:
- params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][0] );
- params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][1] );
- params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][2] );
- params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][3] );
- break;
- case GL_DIFFUSE:
- params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][0] );
- params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][1] );
- params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][2] );
- params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][3] );
- break;
- case GL_SPECULAR:
- params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][0] );
- params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][1] );
- params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][2] );
- params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][3] );
- break;
- case GL_EMISSION:
- params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][0] );
- params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][1] );
- params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][2] );
- params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][3] );
- break;
- case GL_SHININESS:
- *params = IROUND( mat[MAT_ATTRIB_SHININESS(f)][0] );
- break;
- case GL_COLOR_INDEXES:
- params[0] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][0] );
- params[1] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][1] );
- params[2] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][2] );
- break;
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
- }
-}
-
-
-
-/**********************************************************************/
-/***** Lighting computation *****/
-/**********************************************************************/
-
-
-/*
- * Notes:
- * When two-sided lighting is enabled we compute the color (or index)
- * for both the front and back side of the primitive. Then, when the
- * orientation of the facet is later learned, we can determine which
- * color (or index) to use for rendering.
- *
- * KW: We now know orientation in advance and only shade for
- * the side or sides which are actually required.
- *
- * Variables:
- * n = normal vector
- * V = vertex position
- * P = light source position
- * Pe = (0,0,0,1)
- *
- * Precomputed:
- * IF P[3]==0 THEN
- * // light at infinity
- * IF local_viewer THEN
- * _VP_inf_norm = unit vector from V to P // Precompute
- * ELSE
- * // eye at infinity
- * _h_inf_norm = Normalize( VP + <0,0,1> ) // Precompute
- * ENDIF
- * ENDIF
- *
- * Functions:
- * Normalize( v ) = normalized vector v
- * Magnitude( v ) = length of vector v
- */
-
-
-
-/*
- * Whenever the spotlight exponent for a light changes we must call
- * this function to recompute the exponent lookup table.
- */
-void
-_mesa_invalidate_spot_exp_table( struct gl_light *l )
-{
- l->_SpotExpTable[0][0] = -1;
-}
-
-
-static void
-validate_spot_exp_table( struct gl_light *l )
-{
- GLint i;
- GLdouble exponent = l->SpotExponent;
- GLdouble tmp = 0;
- GLint clamp = 0;
-
- l->_SpotExpTable[0][0] = 0.0;
-
- for (i = EXP_TABLE_SIZE - 1; i > 0 ;i--) {
- if (clamp == 0) {
- tmp = pow(i / (GLdouble) (EXP_TABLE_SIZE - 1), exponent);
- if (tmp < FLT_MIN * 100.0) {
- tmp = 0.0;
- clamp = 1;
- }
- }
- l->_SpotExpTable[i][0] = (GLfloat) tmp;
- }
- for (i = 0; i < EXP_TABLE_SIZE - 1; i++) {
- l->_SpotExpTable[i][1] = (l->_SpotExpTable[i+1][0] -
- l->_SpotExpTable[i][0]);
- }
- l->_SpotExpTable[EXP_TABLE_SIZE-1][1] = 0.0;
-}
-
-
-
-/* Calculate a new shine table. Doing this here saves a branch in
- * lighting, and the cost of doing it early may be partially offset
- * by keeping a MRU cache of shine tables for various shine values.
- */
-void
-_mesa_invalidate_shine_table( struct gl_context *ctx, GLuint side )
-{
- ASSERT(side < 2);
- if (ctx->_ShineTable[side])
- ctx->_ShineTable[side]->refcount--;
- ctx->_ShineTable[side] = NULL;
-}
-
-
-static void
-validate_shine_table( struct gl_context *ctx, GLuint side, GLfloat shininess )
-{
- struct gl_shine_tab *list = ctx->_ShineTabList;
- struct gl_shine_tab *s;
-
- ASSERT(side < 2);
-
- foreach(s, list)
- if ( s->shininess == shininess )
- break;
-
- if (s == list) {
- GLint j;
- GLfloat *m;
-
- foreach(s, list)
- if (s->refcount == 0)
- break;
-
- m = s->tab;
- m[0] = 0.0;
- if (shininess == 0.0) {
- for (j = 1 ; j <= SHINE_TABLE_SIZE ; j++)
- m[j] = 1.0;
- }
- else {
- for (j = 1 ; j < SHINE_TABLE_SIZE ; j++) {
- GLdouble t, x = j / (GLfloat) (SHINE_TABLE_SIZE - 1);
- if (x < 0.005) /* underflow check */
- x = 0.005;
- t = pow(x, shininess);
- if (t > 1e-20)
- m[j] = (GLfloat) t;
- else
- m[j] = 0.0;
- }
- m[SHINE_TABLE_SIZE] = 1.0;
- }
-
- s->shininess = shininess;
- }
-
- if (ctx->_ShineTable[side])
- ctx->_ShineTable[side]->refcount--;
-
- ctx->_ShineTable[side] = s;
- move_to_tail( list, s );
- s->refcount++;
-}
-
-
-void
-_mesa_validate_all_lighting_tables( struct gl_context *ctx )
-{
- GLuint i;
- GLfloat shininess;
-
- shininess = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
- if (!ctx->_ShineTable[0] || ctx->_ShineTable[0]->shininess != shininess)
- validate_shine_table( ctx, 0, shininess );
-
- shininess = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
- if (!ctx->_ShineTable[1] || ctx->_ShineTable[1]->shininess != shininess)
- validate_shine_table( ctx, 1, shininess );
-
- for (i = 0; i < ctx->Const.MaxLights; i++)
- if (ctx->Light.Light[i]._SpotExpTable[0][0] == -1)
- validate_spot_exp_table( &ctx->Light.Light[i] );
-}
-
-
-/**
- * Examine current lighting parameters to determine if the optimized lighting
- * function can be used.
- * Also, precompute some lighting values such as the products of light
- * source and material ambient, diffuse and specular coefficients.
- */
-void
-_mesa_update_lighting( struct gl_context *ctx )
-{
- struct gl_light *light;
- ctx->Light._NeedEyeCoords = GL_FALSE;
- ctx->Light._Flags = 0;
-
- if (!ctx->Light.Enabled)
- return;
-
- foreach(light, &ctx->Light.EnabledList) {
- ctx->Light._Flags |= light->_Flags;
- }
-
- ctx->Light._NeedVertices =
- ((ctx->Light._Flags & (LIGHT_POSITIONAL|LIGHT_SPOT)) ||
- ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR ||
- ctx->Light.Model.LocalViewer);
-
- ctx->Light._NeedEyeCoords = ((ctx->Light._Flags & LIGHT_POSITIONAL) ||
- ctx->Light.Model.LocalViewer);
-
- /* XXX: This test is overkill & needs to be fixed both for software and
- * hardware t&l drivers. The above should be sufficient & should
- * be tested to verify this.
- */
- if (ctx->Light._NeedVertices)
- ctx->Light._NeedEyeCoords = GL_TRUE;
-
- /* Precompute some shading values. Although we reference
- * Light.Material here, we can get away without flushing
- * FLUSH_UPDATE_CURRENT, as when any outstanding material changes
- * are flushed, they will update the derived state at that time.
- */
- if (ctx->Light.Model.TwoSide)
- _mesa_update_material(ctx,
- MAT_BIT_FRONT_EMISSION |
- MAT_BIT_FRONT_AMBIENT |
- MAT_BIT_FRONT_DIFFUSE |
- MAT_BIT_FRONT_SPECULAR |
- MAT_BIT_BACK_EMISSION |
- MAT_BIT_BACK_AMBIENT |
- MAT_BIT_BACK_DIFFUSE |
- MAT_BIT_BACK_SPECULAR);
- else
- _mesa_update_material(ctx,
- MAT_BIT_FRONT_EMISSION |
- MAT_BIT_FRONT_AMBIENT |
- MAT_BIT_FRONT_DIFFUSE |
- MAT_BIT_FRONT_SPECULAR);
-}
-
-
-/**
- * Update state derived from light position, spot direction.
- * Called upon:
- * _NEW_MODELVIEW
- * _NEW_LIGHT
- * _TNL_NEW_NEED_EYE_COORDS
- *
- * Update on (_NEW_MODELVIEW | _NEW_LIGHT) when lighting is enabled.
- * Also update on lighting space changes.
- */
-static void
-compute_light_positions( struct gl_context *ctx )
-{
- struct gl_light *light;
- static const GLfloat eye_z[3] = { 0, 0, 1 };
-
- if (!ctx->Light.Enabled)
- return;
-
- if (ctx->_NeedEyeCoords) {
- COPY_3V( ctx->_EyeZDir, eye_z );
- }
- else {
- TRANSFORM_NORMAL( ctx->_EyeZDir, eye_z, ctx->ModelviewMatrixStack.Top->m );
- }
-
- foreach (light, &ctx->Light.EnabledList) {
-
- if (ctx->_NeedEyeCoords) {
- /* _Position is in eye coordinate space */
- COPY_4FV( light->_Position, light->EyePosition );
- }
- else {
- /* _Position is in object coordinate space */
- TRANSFORM_POINT( light->_Position, ctx->ModelviewMatrixStack.Top->inv,
- light->EyePosition );
- }
-
- if (!(light->_Flags & LIGHT_POSITIONAL)) {
- /* VP (VP) = Normalize( Position ) */
- COPY_3V( light->_VP_inf_norm, light->_Position );
- NORMALIZE_3FV( light->_VP_inf_norm );
-
- if (!ctx->Light.Model.LocalViewer) {
- /* _h_inf_norm = Normalize( V_to_P + <0,0,1> ) */
- ADD_3V( light->_h_inf_norm, light->_VP_inf_norm, ctx->_EyeZDir);
- NORMALIZE_3FV( light->_h_inf_norm );
- }
- light->_VP_inf_spot_attenuation = 1.0;
- }
- else {
- /* positional light w/ homogeneous coordinate, divide by W */
- GLfloat wInv = (GLfloat)1.0 / light->_Position[3];
- light->_Position[0] *= wInv;
- light->_Position[1] *= wInv;
- light->_Position[2] *= wInv;
- }
-
- if (light->_Flags & LIGHT_SPOT) {
- /* Note: we normalize the spot direction now */
-
- if (ctx->_NeedEyeCoords) {
- COPY_3V( light->_NormSpotDirection, light->SpotDirection );
- NORMALIZE_3FV( light->_NormSpotDirection );
- }
- else {
- GLfloat spotDir[3];
- COPY_3V(spotDir, light->SpotDirection);
- NORMALIZE_3FV(spotDir);
- TRANSFORM_NORMAL( light->_NormSpotDirection,
- spotDir,
- ctx->ModelviewMatrixStack.Top->m);
- }
-
- NORMALIZE_3FV( light->_NormSpotDirection );
-
- if (!(light->_Flags & LIGHT_POSITIONAL)) {
- GLfloat PV_dot_dir = - DOT3(light->_VP_inf_norm,
- light->_NormSpotDirection);
-
- if (PV_dot_dir > light->_CosCutoff) {
- double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
- int k = (int) x;
- light->_VP_inf_spot_attenuation =
- (GLfloat) (light->_SpotExpTable[k][0] +
- (x-k)*light->_SpotExpTable[k][1]);
- }
- else {
- light->_VP_inf_spot_attenuation = 0;
- }
- }
- }
- }
-}
-
-
-
-static void
-update_modelview_scale( struct gl_context *ctx )
-{
- ctx->_ModelViewInvScale = 1.0F;
- if (!_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top)) {
- const GLfloat *m = ctx->ModelviewMatrixStack.Top->inv;
- GLfloat f = m[2] * m[2] + m[6] * m[6] + m[10] * m[10];
- if (f < 1e-12) f = 1.0;
- if (ctx->_NeedEyeCoords)
- ctx->_ModelViewInvScale = (GLfloat) INV_SQRTF(f);
- else
- ctx->_ModelViewInvScale = (GLfloat) SQRTF(f);
- }
-}
-
-
-/**
- * Bring up to date any state that relies on _NeedEyeCoords.
- */
-void
-_mesa_update_tnl_spaces( struct gl_context *ctx, GLuint new_state )
-{
- const GLuint oldneedeyecoords = ctx->_NeedEyeCoords;
-
- (void) new_state;
- ctx->_NeedEyeCoords = GL_FALSE;
-
- if (ctx->_ForceEyeCoords ||
- (ctx->Texture._GenFlags & TEXGEN_NEED_EYE_COORD) ||
- ctx->Point._Attenuated ||
- ctx->Light._NeedEyeCoords)
- ctx->_NeedEyeCoords = GL_TRUE;
-
- if (ctx->Light.Enabled &&
- !_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top))
- ctx->_NeedEyeCoords = GL_TRUE;
-
- /* Check if the truth-value interpretations of the bitfields have
- * changed:
- */
- if (oldneedeyecoords != ctx->_NeedEyeCoords) {
- /* Recalculate all state that depends on _NeedEyeCoords.
- */
- update_modelview_scale(ctx);
- compute_light_positions( ctx );
-
- if (ctx->Driver.LightingSpaceChange)
- ctx->Driver.LightingSpaceChange( ctx );
- }
- else {
- GLuint new_state2 = ctx->NewState;
-
- /* Recalculate that same state only if it has been invalidated
- * by other statechanges.
- */
- if (new_state2 & _NEW_MODELVIEW)
- update_modelview_scale(ctx);
-
- if (new_state2 & (_NEW_LIGHT|_NEW_MODELVIEW))
- compute_light_positions( ctx );
- }
-}
-
-
-/**
- * Drivers may need this if the hardware tnl unit doesn't support the
- * light-in-modelspace optimization. It's also useful for debugging.
- */
-void
-_mesa_allow_light_in_model( struct gl_context *ctx, GLboolean flag )
-{
- ctx->_ForceEyeCoords = !flag;
- ctx->NewState |= _NEW_POINT; /* one of the bits from
- * _MESA_NEW_NEED_EYE_COORDS.
- */
-}
-
-
-
-/**********************************************************************/
-/***** Initialization *****/
-/**********************************************************************/
-
-/**
- * Initialize the n-th light data structure.
- *
- * \param l pointer to the gl_light structure to be initialized.
- * \param n number of the light.
- * \note The defaults for light 0 are different than the other lights.
- */
-static void
-init_light( struct gl_light *l, GLuint n )
-{
- make_empty_list( l );
-
- ASSIGN_4V( l->Ambient, 0.0, 0.0, 0.0, 1.0 );
- if (n==0) {
- ASSIGN_4V( l->Diffuse, 1.0, 1.0, 1.0, 1.0 );
- ASSIGN_4V( l->Specular, 1.0, 1.0, 1.0, 1.0 );
- }
- else {
- ASSIGN_4V( l->Diffuse, 0.0, 0.0, 0.0, 1.0 );
- ASSIGN_4V( l->Specular, 0.0, 0.0, 0.0, 1.0 );
- }
- ASSIGN_4V( l->EyePosition, 0.0, 0.0, 1.0, 0.0 );
- ASSIGN_3V( l->SpotDirection, 0.0, 0.0, -1.0 );
- l->SpotExponent = 0.0;
- _mesa_invalidate_spot_exp_table( l );
- l->SpotCutoff = 180.0;
- l->_CosCutoffNeg = -1.0f;
- l->_CosCutoff = 0.0; /* KW: -ve values not admitted */
- l->ConstantAttenuation = 1.0;
- l->LinearAttenuation = 0.0;
- l->QuadraticAttenuation = 0.0;
- l->Enabled = GL_FALSE;
-}
-
-
-/**
- * Initialize the light model data structure.
- *
- * \param lm pointer to the gl_lightmodel structure to be initialized.
- */
-static void
-init_lightmodel( struct gl_lightmodel *lm )
-{
- ASSIGN_4V( lm->Ambient, 0.2F, 0.2F, 0.2F, 1.0F );
- lm->LocalViewer = GL_FALSE;
- lm->TwoSide = GL_FALSE;
- lm->ColorControl = GL_SINGLE_COLOR;
-}
-
-
-/**
- * Initialize the material data structure.
- *
- * \param m pointer to the gl_material structure to be initialized.
- */
-static void
-init_material( struct gl_material *m )
-{
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_AMBIENT], 0.2F, 0.2F, 0.2F, 1.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_DIFFUSE], 0.8F, 0.8F, 0.8F, 1.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
-
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_AMBIENT], 0.2F, 0.2F, 0.2F, 1.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_DIFFUSE], 0.8F, 0.8F, 0.8F, 1.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
- ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
-}
-
-
-/**
- * Initialize all lighting state for the given context.
- */
-void
-_mesa_init_lighting( struct gl_context *ctx )
-{
- GLuint i;
-
- /* Lighting group */
- for (i = 0; i < MAX_LIGHTS; i++) {
- init_light( &ctx->Light.Light[i], i );
- }
- make_empty_list( &ctx->Light.EnabledList );
-
- init_lightmodel( &ctx->Light.Model );
- init_material( &ctx->Light.Material );
- ctx->Light.ShadeModel = GL_SMOOTH;
- ctx->Light.ProvokingVertex = GL_LAST_VERTEX_CONVENTION_EXT;
- ctx->Light.Enabled = GL_FALSE;
- ctx->Light.ColorMaterialFace = GL_FRONT_AND_BACK;
- ctx->Light.ColorMaterialMode = GL_AMBIENT_AND_DIFFUSE;
- ctx->Light.ColorMaterialBitmask = _mesa_material_bitmask( ctx,
- GL_FRONT_AND_BACK,
- GL_AMBIENT_AND_DIFFUSE, ~0,
- NULL );
-
- ctx->Light.ColorMaterialEnabled = GL_FALSE;
- ctx->Light.ClampVertexColor = GL_TRUE;
-
- /* Lighting miscellaneous */
- ctx->_ShineTabList = MALLOC_STRUCT( gl_shine_tab );
- make_empty_list( ctx->_ShineTabList );
- /* Allocate 10 (arbitrary) shininess lookup tables */
- for (i = 0 ; i < 10 ; i++) {
- struct gl_shine_tab *s = MALLOC_STRUCT( gl_shine_tab );
- s->shininess = -1;
- s->refcount = 0;
- insert_at_tail( ctx->_ShineTabList, s );
- }
-
- /* Miscellaneous */
- ctx->Light._NeedEyeCoords = GL_FALSE;
- ctx->_NeedEyeCoords = GL_FALSE;
- ctx->_ForceEyeCoords = GL_FALSE;
- ctx->_ModelViewInvScale = 1.0;
-}
-
-
-/**
- * Deallocate malloc'd lighting state attached to given context.
- */
-void
-_mesa_free_lighting_data( struct gl_context *ctx )
-{
- struct gl_shine_tab *s, *tmps;
-
- /* Free lighting shininess exponentiation table */
- foreach_s( s, tmps, ctx->_ShineTabList ) {
- free( s );
- }
- free( ctx->_ShineTabList );
-}
+/*
+ * Mesa 3-D graphics library
+ * Version: 7.5
+ *
+ * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
+ * Copyright (C) 2009 VMware, Inc. All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#include "glheader.h"
+#include "imports.h"
+#include "context.h"
+#include "enums.h"
+#include "light.h"
+#include "macros.h"
+#include "simple_list.h"
+#include "mtypes.h"
+#include "math/m_matrix.h"
+
+
+void GLAPIENTRY
+_mesa_ShadeModel( GLenum mode )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glShadeModel %s\n", _mesa_lookup_enum_by_nr(mode));
+
+ if (mode != GL_FLAT && mode != GL_SMOOTH) {
+ _mesa_error(ctx, GL_INVALID_ENUM, "glShadeModel");
+ return;
+ }
+
+ if (ctx->Light.ShadeModel == mode)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ ctx->Light.ShadeModel = mode;
+ if (mode == GL_FLAT)
+ ctx->_TriangleCaps |= DD_FLATSHADE;
+ else
+ ctx->_TriangleCaps &= ~DD_FLATSHADE;
+
+ if (ctx->Driver.ShadeModel)
+ ctx->Driver.ShadeModel( ctx, mode );
+}
+
+
+/**
+ * Set the provoking vertex (the vertex which specifies the prim's
+ * color when flat shading) to either the first or last vertex of the
+ * triangle or line.
+ */
+void GLAPIENTRY
+_mesa_ProvokingVertexEXT(GLenum mode)
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE&VERBOSE_API)
+ _mesa_debug(ctx, "glProvokingVertexEXT 0x%x\n", mode);
+
+ switch (mode) {
+ case GL_FIRST_VERTEX_CONVENTION_EXT:
+ case GL_LAST_VERTEX_CONVENTION_EXT:
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glProvokingVertexEXT(0x%x)", mode);
+ return;
+ }
+
+ if (ctx->Light.ProvokingVertex == mode)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ ctx->Light.ProvokingVertex = mode;
+}
+
+
+/**
+ * Helper function called by _mesa_Lightfv and _mesa_PopAttrib to set
+ * per-light state.
+ * For GL_POSITION and GL_SPOT_DIRECTION the params position/direction
+ * will have already been transformed by the modelview matrix!
+ * Also, all error checking should have already been done.
+ */
+void
+_mesa_light(struct gl_context *ctx, GLuint lnum, GLenum pname, const GLfloat *params)
+{
+ struct gl_light *light;
+
+ ASSERT(lnum < MAX_LIGHTS);
+ light = &ctx->Light.Light[lnum];
+
+ switch (pname) {
+ case GL_AMBIENT:
+ if (TEST_EQ_4V(light->Ambient, params))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ COPY_4V( light->Ambient, params );
+ break;
+ case GL_DIFFUSE:
+ if (TEST_EQ_4V(light->Diffuse, params))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ COPY_4V( light->Diffuse, params );
+ break;
+ case GL_SPECULAR:
+ if (TEST_EQ_4V(light->Specular, params))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ COPY_4V( light->Specular, params );
+ break;
+ case GL_POSITION:
+ /* NOTE: position has already been transformed by ModelView! */
+ if (TEST_EQ_4V(light->EyePosition, params))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ COPY_4V(light->EyePosition, params);
+ if (light->EyePosition[3] != 0.0F)
+ light->_Flags |= LIGHT_POSITIONAL;
+ else
+ light->_Flags &= ~LIGHT_POSITIONAL;
+ break;
+ case GL_SPOT_DIRECTION:
+ /* NOTE: Direction already transformed by inverse ModelView! */
+ if (TEST_EQ_3V(light->SpotDirection, params))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ COPY_3V(light->SpotDirection, params);
+ break;
+ case GL_SPOT_EXPONENT:
+ ASSERT(params[0] >= 0.0);
+ ASSERT(params[0] <= ctx->Const.MaxSpotExponent);
+ if (light->SpotExponent == params[0])
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ light->SpotExponent = params[0];
+ _mesa_invalidate_spot_exp_table(light);
+ break;
+ case GL_SPOT_CUTOFF:
+ ASSERT(params[0] == 180.0 || (params[0] >= 0.0 && params[0] <= 90.0));
+ if (light->SpotCutoff == params[0])
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ light->SpotCutoff = params[0];
+ light->_CosCutoffNeg = (GLfloat) (cos(light->SpotCutoff * DEG2RAD));
+ if (light->_CosCutoffNeg < 0)
+ light->_CosCutoff = 0;
+ else
+ light->_CosCutoff = light->_CosCutoffNeg;
+ if (light->SpotCutoff != 180.0F)
+ light->_Flags |= LIGHT_SPOT;
+ else
+ light->_Flags &= ~LIGHT_SPOT;
+ break;
+ case GL_CONSTANT_ATTENUATION:
+ ASSERT(params[0] >= 0.0);
+ if (light->ConstantAttenuation == params[0])
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ light->ConstantAttenuation = params[0];
+ break;
+ case GL_LINEAR_ATTENUATION:
+ ASSERT(params[0] >= 0.0);
+ if (light->LinearAttenuation == params[0])
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ light->LinearAttenuation = params[0];
+ break;
+ case GL_QUADRATIC_ATTENUATION:
+ ASSERT(params[0] >= 0.0);
+ if (light->QuadraticAttenuation == params[0])
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ light->QuadraticAttenuation = params[0];
+ break;
+ default:
+ _mesa_problem(ctx, "Unexpected pname in _mesa_light()");
+ return;
+ }
+
+ if (ctx->Driver.Lightfv)
+ ctx->Driver.Lightfv( ctx, GL_LIGHT0 + lnum, pname, params );
+}
+
+
+void GLAPIENTRY
+_mesa_Lightf( GLenum light, GLenum pname, GLfloat param )
+{
+ GLfloat fparam[4];
+ fparam[0] = param;
+ fparam[1] = fparam[2] = fparam[3] = 0.0F;
+ _mesa_Lightfv( light, pname, fparam );
+}
+
+
+void GLAPIENTRY
+_mesa_Lightfv( GLenum light, GLenum pname, const GLfloat *params )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLint i = (GLint) (light - GL_LIGHT0);
+ GLfloat temp[4];
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (i < 0 || i >= (GLint) ctx->Const.MaxLights) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glLight(light=0x%x)", light );
+ return;
+ }
+
+ /* do particular error checks, transformations */
+ switch (pname) {
+ case GL_AMBIENT:
+ case GL_DIFFUSE:
+ case GL_SPECULAR:
+ /* nothing */
+ break;
+ case GL_POSITION:
+ /* transform position by ModelView matrix */
+ TRANSFORM_POINT(temp, ctx->ModelviewMatrixStack.Top->m, params);
+ params = temp;
+ break;
+ case GL_SPOT_DIRECTION:
+ /* transform direction by inverse modelview */
+ if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {
+ _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
+ }
+ TRANSFORM_DIRECTION(temp, params, ctx->ModelviewMatrixStack.Top->m);
+ params = temp;
+ break;
+ case GL_SPOT_EXPONENT:
+ if (params[0] < 0.0 || params[0] > ctx->Const.MaxSpotExponent) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
+ return;
+ }
+ break;
+ case GL_SPOT_CUTOFF:
+ if ((params[0] < 0.0 || params[0] > 90.0) && params[0] != 180.0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
+ return;
+ }
+ break;
+ case GL_CONSTANT_ATTENUATION:
+ if (params[0] < 0.0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
+ return;
+ }
+ break;
+ case GL_LINEAR_ATTENUATION:
+ if (params[0] < 0.0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
+ return;
+ }
+ break;
+ case GL_QUADRATIC_ATTENUATION:
+ if (params[0] < 0.0) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
+ return;
+ }
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glLight(pname=0x%x)", pname);
+ return;
+ }
+
+ _mesa_light(ctx, i, pname, params);
+}
+
+
+void GLAPIENTRY
+_mesa_Lighti( GLenum light, GLenum pname, GLint param )
+{
+ GLint iparam[4];
+ iparam[0] = param;
+ iparam[1] = iparam[2] = iparam[3] = 0;
+ _mesa_Lightiv( light, pname, iparam );
+}
+
+
+void GLAPIENTRY
+_mesa_Lightiv( GLenum light, GLenum pname, const GLint *params )
+{
+ GLfloat fparam[4];
+
+ switch (pname) {
+ case GL_AMBIENT:
+ case GL_DIFFUSE:
+ case GL_SPECULAR:
+ fparam[0] = INT_TO_FLOAT( params[0] );
+ fparam[1] = INT_TO_FLOAT( params[1] );
+ fparam[2] = INT_TO_FLOAT( params[2] );
+ fparam[3] = INT_TO_FLOAT( params[3] );
+ break;
+ case GL_POSITION:
+ fparam[0] = (GLfloat) params[0];
+ fparam[1] = (GLfloat) params[1];
+ fparam[2] = (GLfloat) params[2];
+ fparam[3] = (GLfloat) params[3];
+ break;
+ case GL_SPOT_DIRECTION:
+ fparam[0] = (GLfloat) params[0];
+ fparam[1] = (GLfloat) params[1];
+ fparam[2] = (GLfloat) params[2];
+ break;
+ case GL_SPOT_EXPONENT:
+ case GL_SPOT_CUTOFF:
+ case GL_CONSTANT_ATTENUATION:
+ case GL_LINEAR_ATTENUATION:
+ case GL_QUADRATIC_ATTENUATION:
+ fparam[0] = (GLfloat) params[0];
+ break;
+ default:
+ /* error will be caught later in gl_Lightfv */
+ ;
+ }
+
+ _mesa_Lightfv( light, pname, fparam );
+}
+
+
+
+void GLAPIENTRY
+_mesa_GetLightfv( GLenum light, GLenum pname, GLfloat *params )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLint l = (GLint) (light - GL_LIGHT0);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (l < 0 || l >= (GLint) ctx->Const.MaxLights) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
+ return;
+ }
+
+ switch (pname) {
+ case GL_AMBIENT:
+ COPY_4V( params, ctx->Light.Light[l].Ambient );
+ break;
+ case GL_DIFFUSE:
+ COPY_4V( params, ctx->Light.Light[l].Diffuse );
+ break;
+ case GL_SPECULAR:
+ COPY_4V( params, ctx->Light.Light[l].Specular );
+ break;
+ case GL_POSITION:
+ COPY_4V( params, ctx->Light.Light[l].EyePosition );
+ break;
+ case GL_SPOT_DIRECTION:
+ COPY_3V( params, ctx->Light.Light[l].SpotDirection );
+ break;
+ case GL_SPOT_EXPONENT:
+ params[0] = ctx->Light.Light[l].SpotExponent;
+ break;
+ case GL_SPOT_CUTOFF:
+ params[0] = ctx->Light.Light[l].SpotCutoff;
+ break;
+ case GL_CONSTANT_ATTENUATION:
+ params[0] = ctx->Light.Light[l].ConstantAttenuation;
+ break;
+ case GL_LINEAR_ATTENUATION:
+ params[0] = ctx->Light.Light[l].LinearAttenuation;
+ break;
+ case GL_QUADRATIC_ATTENUATION:
+ params[0] = ctx->Light.Light[l].QuadraticAttenuation;
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
+ break;
+ }
+}
+
+
+void GLAPIENTRY
+_mesa_GetLightiv( GLenum light, GLenum pname, GLint *params )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLint l = (GLint) (light - GL_LIGHT0);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (l < 0 || l >= (GLint) ctx->Const.MaxLights) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
+ return;
+ }
+
+ switch (pname) {
+ case GL_AMBIENT:
+ params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[0]);
+ params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[1]);
+ params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[2]);
+ params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[3]);
+ break;
+ case GL_DIFFUSE:
+ params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[0]);
+ params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[1]);
+ params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[2]);
+ params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[3]);
+ break;
+ case GL_SPECULAR:
+ params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[0]);
+ params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[1]);
+ params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[2]);
+ params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[3]);
+ break;
+ case GL_POSITION:
+ params[0] = (GLint) ctx->Light.Light[l].EyePosition[0];
+ params[1] = (GLint) ctx->Light.Light[l].EyePosition[1];
+ params[2] = (GLint) ctx->Light.Light[l].EyePosition[2];
+ params[3] = (GLint) ctx->Light.Light[l].EyePosition[3];
+ break;
+ case GL_SPOT_DIRECTION:
+ params[0] = (GLint) ctx->Light.Light[l].SpotDirection[0];
+ params[1] = (GLint) ctx->Light.Light[l].SpotDirection[1];
+ params[2] = (GLint) ctx->Light.Light[l].SpotDirection[2];
+ break;
+ case GL_SPOT_EXPONENT:
+ params[0] = (GLint) ctx->Light.Light[l].SpotExponent;
+ break;
+ case GL_SPOT_CUTOFF:
+ params[0] = (GLint) ctx->Light.Light[l].SpotCutoff;
+ break;
+ case GL_CONSTANT_ATTENUATION:
+ params[0] = (GLint) ctx->Light.Light[l].ConstantAttenuation;
+ break;
+ case GL_LINEAR_ATTENUATION:
+ params[0] = (GLint) ctx->Light.Light[l].LinearAttenuation;
+ break;
+ case GL_QUADRATIC_ATTENUATION:
+ params[0] = (GLint) ctx->Light.Light[l].QuadraticAttenuation;
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
+ break;
+ }
+}
+
+
+
+/**********************************************************************/
+/*** Light Model ***/
+/**********************************************************************/
+
+
+void GLAPIENTRY
+_mesa_LightModelfv( GLenum pname, const GLfloat *params )
+{
+ GLenum newenum;
+ GLboolean newbool;
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ switch (pname) {
+ case GL_LIGHT_MODEL_AMBIENT:
+ if (TEST_EQ_4V( ctx->Light.Model.Ambient, params ))
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ COPY_4V( ctx->Light.Model.Ambient, params );
+ break;
+ case GL_LIGHT_MODEL_LOCAL_VIEWER:
+ newbool = (params[0]!=0.0);
+ if (ctx->Light.Model.LocalViewer == newbool)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ ctx->Light.Model.LocalViewer = newbool;
+ break;
+ case GL_LIGHT_MODEL_TWO_SIDE:
+ newbool = (params[0]!=0.0);
+ if (ctx->Light.Model.TwoSide == newbool)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ ctx->Light.Model.TwoSide = newbool;
+ if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
+ ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
+ else
+ ctx->_TriangleCaps &= ~DD_TRI_LIGHT_TWOSIDE;
+ break;
+ case GL_LIGHT_MODEL_COLOR_CONTROL:
+ if (params[0] == (GLfloat) GL_SINGLE_COLOR)
+ newenum = GL_SINGLE_COLOR;
+ else if (params[0] == (GLfloat) GL_SEPARATE_SPECULAR_COLOR)
+ newenum = GL_SEPARATE_SPECULAR_COLOR;
+ else {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(param=0x0%x)",
+ (GLint) params[0] );
+ return;
+ }
+ if (ctx->Light.Model.ColorControl == newenum)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ ctx->Light.Model.ColorControl = newenum;
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(pname=0x%x)", pname );
+ break;
+ }
+
+ if (ctx->Driver.LightModelfv)
+ ctx->Driver.LightModelfv( ctx, pname, params );
+}
+
+
+void GLAPIENTRY
+_mesa_LightModeliv( GLenum pname, const GLint *params )
+{
+ GLfloat fparam[4];
+
+ switch (pname) {
+ case GL_LIGHT_MODEL_AMBIENT:
+ fparam[0] = INT_TO_FLOAT( params[0] );
+ fparam[1] = INT_TO_FLOAT( params[1] );
+ fparam[2] = INT_TO_FLOAT( params[2] );
+ fparam[3] = INT_TO_FLOAT( params[3] );
+ break;
+ case GL_LIGHT_MODEL_LOCAL_VIEWER:
+ case GL_LIGHT_MODEL_TWO_SIDE:
+ case GL_LIGHT_MODEL_COLOR_CONTROL:
+ fparam[0] = (GLfloat) params[0];
+ break;
+ default:
+ /* Error will be caught later in gl_LightModelfv */
+ ASSIGN_4V(fparam, 0.0F, 0.0F, 0.0F, 0.0F);
+ }
+ _mesa_LightModelfv( pname, fparam );
+}
+
+
+void GLAPIENTRY
+_mesa_LightModeli( GLenum pname, GLint param )
+{
+ GLint iparam[4];
+ iparam[0] = param;
+ iparam[1] = iparam[2] = iparam[3] = 0;
+ _mesa_LightModeliv( pname, iparam );
+}
+
+
+void GLAPIENTRY
+_mesa_LightModelf( GLenum pname, GLfloat param )
+{
+ GLfloat fparam[4];
+ fparam[0] = param;
+ fparam[1] = fparam[2] = fparam[3] = 0.0F;
+ _mesa_LightModelfv( pname, fparam );
+}
+
+
+
+/********** MATERIAL **********/
+
+
+/*
+ * Given a face and pname value (ala glColorMaterial), compute a bitmask
+ * of the targeted material values.
+ */
+GLuint
+_mesa_material_bitmask( struct gl_context *ctx, GLenum face, GLenum pname,
+ GLuint legal, const char *where )
+{
+ GLuint bitmask = 0;
+
+ /* Make a bitmask indicating what material attribute(s) we're updating */
+ switch (pname) {
+ case GL_EMISSION:
+ bitmask |= MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION;
+ break;
+ case GL_AMBIENT:
+ bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
+ break;
+ case GL_DIFFUSE:
+ bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
+ break;
+ case GL_SPECULAR:
+ bitmask |= MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR;
+ break;
+ case GL_SHININESS:
+ bitmask |= MAT_BIT_FRONT_SHININESS | MAT_BIT_BACK_SHININESS;
+ break;
+ case GL_AMBIENT_AND_DIFFUSE:
+ bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
+ bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
+ break;
+ case GL_COLOR_INDEXES:
+ bitmask |= MAT_BIT_FRONT_INDEXES | MAT_BIT_BACK_INDEXES;
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
+ return 0;
+ }
+
+ if (face==GL_FRONT) {
+ bitmask &= FRONT_MATERIAL_BITS;
+ }
+ else if (face==GL_BACK) {
+ bitmask &= BACK_MATERIAL_BITS;
+ }
+ else if (face != GL_FRONT_AND_BACK) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
+ return 0;
+ }
+
+ if (bitmask & ~legal) {
+ _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
+ return 0;
+ }
+
+ return bitmask;
+}
+
+
+
+/* Perform a straight copy between materials.
+ */
+void
+_mesa_copy_materials( struct gl_material *dst,
+ const struct gl_material *src,
+ GLuint bitmask )
+{
+ int i;
+
+ for (i = 0 ; i < MAT_ATTRIB_MAX ; i++)
+ if (bitmask & (1<<i))
+ COPY_4FV( dst->Attrib[i], src->Attrib[i] );
+}
+
+
+
+/* Update derived values following a change in ctx->Light.Material
+ */
+void
+_mesa_update_material( struct gl_context *ctx, GLuint bitmask )
+{
+ struct gl_light *light, *list = &ctx->Light.EnabledList;
+ GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
+
+ if (MESA_VERBOSE & VERBOSE_MATERIAL)
+ _mesa_debug(ctx, "_mesa_update_material, mask 0x%x\n", bitmask);
+
+ if (!bitmask)
+ return;
+
+ /* update material ambience */
+ if (bitmask & MAT_BIT_FRONT_AMBIENT) {
+ foreach (light, list) {
+ SCALE_3V( light->_MatAmbient[0], light->Ambient,
+ mat[MAT_ATTRIB_FRONT_AMBIENT]);
+ }
+ }
+
+ if (bitmask & MAT_BIT_BACK_AMBIENT) {
+ foreach (light, list) {
+ SCALE_3V( light->_MatAmbient[1], light->Ambient,
+ mat[MAT_ATTRIB_BACK_AMBIENT]);
+ }
+ }
+
+ /* update BaseColor = emission + scene's ambience * material's ambience */
+ if (bitmask & (MAT_BIT_FRONT_EMISSION | MAT_BIT_FRONT_AMBIENT)) {
+ COPY_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_EMISSION] );
+ ACC_SCALE_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_AMBIENT],
+ ctx->Light.Model.Ambient );
+ }
+
+ if (bitmask & (MAT_BIT_BACK_EMISSION | MAT_BIT_BACK_AMBIENT)) {
+ COPY_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_EMISSION] );
+ ACC_SCALE_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_AMBIENT],
+ ctx->Light.Model.Ambient );
+ }
+
+ /* update material diffuse values */
+ if (bitmask & MAT_BIT_FRONT_DIFFUSE) {
+ foreach (light, list) {
+ SCALE_3V( light->_MatDiffuse[0], light->Diffuse,
+ mat[MAT_ATTRIB_FRONT_DIFFUSE] );
+ }
+ }
+
+ if (bitmask & MAT_BIT_BACK_DIFFUSE) {
+ foreach (light, list) {
+ SCALE_3V( light->_MatDiffuse[1], light->Diffuse,
+ mat[MAT_ATTRIB_BACK_DIFFUSE] );
+ }
+ }
+
+ /* update material specular values */
+ if (bitmask & MAT_BIT_FRONT_SPECULAR) {
+ foreach (light, list) {
+ SCALE_3V( light->_MatSpecular[0], light->Specular,
+ mat[MAT_ATTRIB_FRONT_SPECULAR]);
+ }
+ }
+
+ if (bitmask & MAT_BIT_BACK_SPECULAR) {
+ foreach (light, list) {
+ SCALE_3V( light->_MatSpecular[1], light->Specular,
+ mat[MAT_ATTRIB_BACK_SPECULAR]);
+ }
+ }
+
+ if (bitmask & MAT_BIT_FRONT_SHININESS) {
+ _mesa_invalidate_shine_table( ctx, 0 );
+ }
+
+ if (bitmask & MAT_BIT_BACK_SHININESS) {
+ _mesa_invalidate_shine_table( ctx, 1 );
+ }
+}
+
+
+/*
+ * Update the current materials from the given rgba color
+ * according to the bitmask in ColorMaterialBitmask, which is
+ * set by glColorMaterial().
+ */
+void
+_mesa_update_color_material( struct gl_context *ctx, const GLfloat color[4] )
+{
+ GLuint bitmask = ctx->Light.ColorMaterialBitmask;
+ struct gl_material *mat = &ctx->Light.Material;
+ int i;
+
+ for (i = 0 ; i < MAT_ATTRIB_MAX ; i++)
+ if (bitmask & (1<<i))
+ COPY_4FV( mat->Attrib[i], color );
+
+ _mesa_update_material( ctx, bitmask );
+}
+
+
+void GLAPIENTRY
+_mesa_ColorMaterial( GLenum face, GLenum mode )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLuint bitmask;
+ GLuint legal = (MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION |
+ MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR |
+ MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE |
+ MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE&VERBOSE_API)
+ _mesa_debug(ctx, "glColorMaterial %s %s\n",
+ _mesa_lookup_enum_by_nr(face),
+ _mesa_lookup_enum_by_nr(mode));
+
+ bitmask = _mesa_material_bitmask(ctx, face, mode, legal, "glColorMaterial");
+
+ if (ctx->Light.ColorMaterialBitmask == bitmask &&
+ ctx->Light.ColorMaterialFace == face &&
+ ctx->Light.ColorMaterialMode == mode)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_LIGHT);
+ ctx->Light.ColorMaterialBitmask = bitmask;
+ ctx->Light.ColorMaterialFace = face;
+ ctx->Light.ColorMaterialMode = mode;
+
+ if (ctx->Light.ColorMaterialEnabled) {
+ FLUSH_CURRENT( ctx, 0 );
+ _mesa_update_color_material(ctx,ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
+ }
+
+ if (ctx->Driver.ColorMaterial)
+ ctx->Driver.ColorMaterial( ctx, face, mode );
+}
+
+
+void GLAPIENTRY
+_mesa_GetMaterialfv( GLenum face, GLenum pname, GLfloat *params )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLuint f;
+ GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* update materials */
+
+ FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
+
+ if (face==GL_FRONT) {
+ f = 0;
+ }
+ else if (face==GL_BACK) {
+ f = 1;
+ }
+ else {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(face)" );
+ return;
+ }
+
+ switch (pname) {
+ case GL_AMBIENT:
+ COPY_4FV( params, mat[MAT_ATTRIB_AMBIENT(f)] );
+ break;
+ case GL_DIFFUSE:
+ COPY_4FV( params, mat[MAT_ATTRIB_DIFFUSE(f)] );
+ break;
+ case GL_SPECULAR:
+ COPY_4FV( params, mat[MAT_ATTRIB_SPECULAR(f)] );
+ break;
+ case GL_EMISSION:
+ COPY_4FV( params, mat[MAT_ATTRIB_EMISSION(f)] );
+ break;
+ case GL_SHININESS:
+ *params = mat[MAT_ATTRIB_SHININESS(f)][0];
+ break;
+ case GL_COLOR_INDEXES:
+ params[0] = mat[MAT_ATTRIB_INDEXES(f)][0];
+ params[1] = mat[MAT_ATTRIB_INDEXES(f)][1];
+ params[2] = mat[MAT_ATTRIB_INDEXES(f)][2];
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
+ }
+}
+
+
+void GLAPIENTRY
+_mesa_GetMaterialiv( GLenum face, GLenum pname, GLint *params )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ GLuint f;
+ GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* update materials */
+
+ FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
+
+ if (face==GL_FRONT) {
+ f = 0;
+ }
+ else if (face==GL_BACK) {
+ f = 1;
+ }
+ else {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialiv(face)" );
+ return;
+ }
+ switch (pname) {
+ case GL_AMBIENT:
+ params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][0] );
+ params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][1] );
+ params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][2] );
+ params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][3] );
+ break;
+ case GL_DIFFUSE:
+ params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][0] );
+ params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][1] );
+ params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][2] );
+ params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][3] );
+ break;
+ case GL_SPECULAR:
+ params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][0] );
+ params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][1] );
+ params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][2] );
+ params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][3] );
+ break;
+ case GL_EMISSION:
+ params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][0] );
+ params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][1] );
+ params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][2] );
+ params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][3] );
+ break;
+ case GL_SHININESS:
+ *params = IROUND( mat[MAT_ATTRIB_SHININESS(f)][0] );
+ break;
+ case GL_COLOR_INDEXES:
+ params[0] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][0] );
+ params[1] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][1] );
+ params[2] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][2] );
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
+ }
+}
+
+
+
+/**********************************************************************/
+/***** Lighting computation *****/
+/**********************************************************************/
+
+
+/*
+ * Notes:
+ * When two-sided lighting is enabled we compute the color (or index)
+ * for both the front and back side of the primitive. Then, when the
+ * orientation of the facet is later learned, we can determine which
+ * color (or index) to use for rendering.
+ *
+ * KW: We now know orientation in advance and only shade for
+ * the side or sides which are actually required.
+ *
+ * Variables:
+ * n = normal vector
+ * V = vertex position
+ * P = light source position
+ * Pe = (0,0,0,1)
+ *
+ * Precomputed:
+ * IF P[3]==0 THEN
+ * // light at infinity
+ * IF local_viewer THEN
+ * _VP_inf_norm = unit vector from V to P // Precompute
+ * ELSE
+ * // eye at infinity
+ * _h_inf_norm = Normalize( VP + <0,0,1> ) // Precompute
+ * ENDIF
+ * ENDIF
+ *
+ * Functions:
+ * Normalize( v ) = normalized vector v
+ * Magnitude( v ) = length of vector v
+ */
+
+
+
+/*
+ * Whenever the spotlight exponent for a light changes we must call
+ * this function to recompute the exponent lookup table.
+ */
+void
+_mesa_invalidate_spot_exp_table( struct gl_light *l )
+{
+ l->_SpotExpTable[0][0] = -1;
+}
+
+
+static void
+validate_spot_exp_table( struct gl_light *l )
+{
+ GLint i;
+ GLdouble exponent = l->SpotExponent;
+ GLdouble tmp = 0;
+ GLint clamp = 0;
+
+ l->_SpotExpTable[0][0] = 0.0;
+
+ for (i = EXP_TABLE_SIZE - 1; i > 0 ;i--) {
+ if (clamp == 0) {
+ tmp = pow(i / (GLdouble) (EXP_TABLE_SIZE - 1), exponent);
+ if (tmp < FLT_MIN * 100.0) {
+ tmp = 0.0;
+ clamp = 1;
+ }
+ }
+ l->_SpotExpTable[i][0] = (GLfloat) tmp;
+ }
+ for (i = 0; i < EXP_TABLE_SIZE - 1; i++) {
+ l->_SpotExpTable[i][1] = (l->_SpotExpTable[i+1][0] -
+ l->_SpotExpTable[i][0]);
+ }
+ l->_SpotExpTable[EXP_TABLE_SIZE-1][1] = 0.0;
+}
+
+
+
+/* Calculate a new shine table. Doing this here saves a branch in
+ * lighting, and the cost of doing it early may be partially offset
+ * by keeping a MRU cache of shine tables for various shine values.
+ */
+void
+_mesa_invalidate_shine_table( struct gl_context *ctx, GLuint side )
+{
+ ASSERT(side < 2);
+ if (ctx->_ShineTable[side])
+ ctx->_ShineTable[side]->refcount--;
+ ctx->_ShineTable[side] = NULL;
+}
+
+
+static void
+validate_shine_table( struct gl_context *ctx, GLuint side, GLfloat shininess )
+{
+ struct gl_shine_tab *list = ctx->_ShineTabList;
+ struct gl_shine_tab *s;
+
+ ASSERT(side < 2);
+
+ foreach(s, list)
+ if ( s->shininess == shininess )
+ break;
+
+ if (s == list) {
+ GLint j;
+ GLfloat *m;
+
+ foreach(s, list)
+ if (s->refcount == 0)
+ break;
+
+ m = s->tab;
+ m[0] = 0.0;
+ if (shininess == 0.0) {
+ for (j = 1 ; j <= SHINE_TABLE_SIZE ; j++)
+ m[j] = 1.0;
+ }
+ else {
+ for (j = 1 ; j < SHINE_TABLE_SIZE ; j++) {
+ GLdouble t, x = j / (GLfloat) (SHINE_TABLE_SIZE - 1);
+ if (x < 0.005) /* underflow check */
+ x = 0.005;
+ t = pow(x, shininess);
+ if (t > 1e-20)
+ m[j] = (GLfloat) t;
+ else
+ m[j] = 0.0;
+ }
+ m[SHINE_TABLE_SIZE] = 1.0;
+ }
+
+ s->shininess = shininess;
+ }
+
+ if (ctx->_ShineTable[side])
+ ctx->_ShineTable[side]->refcount--;
+
+ ctx->_ShineTable[side] = s;
+ move_to_tail( list, s );
+ s->refcount++;
+}
+
+
+void
+_mesa_validate_all_lighting_tables( struct gl_context *ctx )
+{
+ GLuint i;
+ GLfloat shininess;
+
+ shininess = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
+ if (!ctx->_ShineTable[0] || ctx->_ShineTable[0]->shininess != shininess)
+ validate_shine_table( ctx, 0, shininess );
+
+ shininess = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
+ if (!ctx->_ShineTable[1] || ctx->_ShineTable[1]->shininess != shininess)
+ validate_shine_table( ctx, 1, shininess );
+
+ for (i = 0; i < ctx->Const.MaxLights; i++)
+ if (ctx->Light.Light[i]._SpotExpTable[0][0] == -1)
+ validate_spot_exp_table( &ctx->Light.Light[i] );
+}
+
+
+/**
+ * Examine current lighting parameters to determine if the optimized lighting
+ * function can be used.
+ * Also, precompute some lighting values such as the products of light
+ * source and material ambient, diffuse and specular coefficients.
+ */
+void
+_mesa_update_lighting( struct gl_context *ctx )
+{
+ struct gl_light *light;
+ ctx->Light._NeedEyeCoords = GL_FALSE;
+ ctx->Light._Flags = 0;
+
+ if (!ctx->Light.Enabled)
+ return;
+
+ foreach(light, &ctx->Light.EnabledList) {
+ ctx->Light._Flags |= light->_Flags;
+ }
+
+ ctx->Light._NeedVertices =
+ ((ctx->Light._Flags & (LIGHT_POSITIONAL|LIGHT_SPOT)) ||
+ ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR ||
+ ctx->Light.Model.LocalViewer);
+
+ ctx->Light._NeedEyeCoords = ((ctx->Light._Flags & LIGHT_POSITIONAL) ||
+ ctx->Light.Model.LocalViewer);
+
+ /* XXX: This test is overkill & needs to be fixed both for software and
+ * hardware t&l drivers. The above should be sufficient & should
+ * be tested to verify this.
+ */
+ if (ctx->Light._NeedVertices)
+ ctx->Light._NeedEyeCoords = GL_TRUE;
+
+ /* Precompute some shading values. Although we reference
+ * Light.Material here, we can get away without flushing
+ * FLUSH_UPDATE_CURRENT, as when any outstanding material changes
+ * are flushed, they will update the derived state at that time.
+ */
+ if (ctx->Light.Model.TwoSide)
+ _mesa_update_material(ctx,
+ MAT_BIT_FRONT_EMISSION |
+ MAT_BIT_FRONT_AMBIENT |
+ MAT_BIT_FRONT_DIFFUSE |
+ MAT_BIT_FRONT_SPECULAR |
+ MAT_BIT_BACK_EMISSION |
+ MAT_BIT_BACK_AMBIENT |
+ MAT_BIT_BACK_DIFFUSE |
+ MAT_BIT_BACK_SPECULAR);
+ else
+ _mesa_update_material(ctx,
+ MAT_BIT_FRONT_EMISSION |
+ MAT_BIT_FRONT_AMBIENT |
+ MAT_BIT_FRONT_DIFFUSE |
+ MAT_BIT_FRONT_SPECULAR);
+}
+
+
+/**
+ * Update state derived from light position, spot direction.
+ * Called upon:
+ * _NEW_MODELVIEW
+ * _NEW_LIGHT
+ * _TNL_NEW_NEED_EYE_COORDS
+ *
+ * Update on (_NEW_MODELVIEW | _NEW_LIGHT) when lighting is enabled.
+ * Also update on lighting space changes.
+ */
+static void
+compute_light_positions( struct gl_context *ctx )
+{
+ struct gl_light *light;
+ static const GLfloat eye_z[3] = { 0, 0, 1 };
+
+ if (!ctx->Light.Enabled)
+ return;
+
+ if (ctx->_NeedEyeCoords) {
+ COPY_3V( ctx->_EyeZDir, eye_z );
+ }
+ else {
+ TRANSFORM_NORMAL( ctx->_EyeZDir, eye_z, ctx->ModelviewMatrixStack.Top->m );
+ }
+
+ /* Make sure all the light tables are updated before the computation */
+ _mesa_validate_all_lighting_tables(ctx);
+
+ foreach (light, &ctx->Light.EnabledList) {
+
+ if (ctx->_NeedEyeCoords) {
+ /* _Position is in eye coordinate space */
+ COPY_4FV( light->_Position, light->EyePosition );
+ }
+ else {
+ /* _Position is in object coordinate space */
+ TRANSFORM_POINT( light->_Position, ctx->ModelviewMatrixStack.Top->inv,
+ light->EyePosition );
+ }
+
+ if (!(light->_Flags & LIGHT_POSITIONAL)) {
+ /* VP (VP) = Normalize( Position ) */
+ COPY_3V( light->_VP_inf_norm, light->_Position );
+ NORMALIZE_3FV( light->_VP_inf_norm );
+
+ if (!ctx->Light.Model.LocalViewer) {
+ /* _h_inf_norm = Normalize( V_to_P + <0,0,1> ) */
+ ADD_3V( light->_h_inf_norm, light->_VP_inf_norm, ctx->_EyeZDir);
+ NORMALIZE_3FV( light->_h_inf_norm );
+ }
+ light->_VP_inf_spot_attenuation = 1.0;
+ }
+ else {
+ /* positional light w/ homogeneous coordinate, divide by W */
+ GLfloat wInv = (GLfloat)1.0 / light->_Position[3];
+ light->_Position[0] *= wInv;
+ light->_Position[1] *= wInv;
+ light->_Position[2] *= wInv;
+ }
+
+ if (light->_Flags & LIGHT_SPOT) {
+ /* Note: we normalize the spot direction now */
+
+ if (ctx->_NeedEyeCoords) {
+ COPY_3V( light->_NormSpotDirection, light->SpotDirection );
+ NORMALIZE_3FV( light->_NormSpotDirection );
+ }
+ else {
+ GLfloat spotDir[3];
+ COPY_3V(spotDir, light->SpotDirection);
+ NORMALIZE_3FV(spotDir);
+ TRANSFORM_NORMAL( light->_NormSpotDirection,
+ spotDir,
+ ctx->ModelviewMatrixStack.Top->m);
+ }
+
+ NORMALIZE_3FV( light->_NormSpotDirection );
+
+ if (!(light->_Flags & LIGHT_POSITIONAL)) {
+ GLfloat PV_dot_dir = - DOT3(light->_VP_inf_norm,
+ light->_NormSpotDirection);
+
+ if (PV_dot_dir > light->_CosCutoff) {
+ double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
+ int k = (int) x;
+ light->_VP_inf_spot_attenuation =
+ (GLfloat) (light->_SpotExpTable[k][0] +
+ (x-k)*light->_SpotExpTable[k][1]);
+ }
+ else {
+ light->_VP_inf_spot_attenuation = 0;
+ }
+ }
+ }
+ }
+}
+
+
+
+static void
+update_modelview_scale( struct gl_context *ctx )
+{
+ ctx->_ModelViewInvScale = 1.0F;
+ if (!_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top)) {
+ const GLfloat *m = ctx->ModelviewMatrixStack.Top->inv;
+ GLfloat f = m[2] * m[2] + m[6] * m[6] + m[10] * m[10];
+ if (f < 1e-12) f = 1.0;
+ if (ctx->_NeedEyeCoords)
+ ctx->_ModelViewInvScale = (GLfloat) INV_SQRTF(f);
+ else
+ ctx->_ModelViewInvScale = (GLfloat) SQRTF(f);
+ }
+}
+
+
+/**
+ * Bring up to date any state that relies on _NeedEyeCoords.
+ */
+void
+_mesa_update_tnl_spaces( struct gl_context *ctx, GLuint new_state )
+{
+ const GLuint oldneedeyecoords = ctx->_NeedEyeCoords;
+
+ (void) new_state;
+ ctx->_NeedEyeCoords = GL_FALSE;
+
+ if (ctx->_ForceEyeCoords ||
+ (ctx->Texture._GenFlags & TEXGEN_NEED_EYE_COORD) ||
+ ctx->Point._Attenuated ||
+ ctx->Light._NeedEyeCoords)
+ ctx->_NeedEyeCoords = GL_TRUE;
+
+ if (ctx->Light.Enabled &&
+ !_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top))
+ ctx->_NeedEyeCoords = GL_TRUE;
+
+ /* Check if the truth-value interpretations of the bitfields have
+ * changed:
+ */
+ if (oldneedeyecoords != ctx->_NeedEyeCoords) {
+ /* Recalculate all state that depends on _NeedEyeCoords.
+ */
+ update_modelview_scale(ctx);
+ compute_light_positions( ctx );
+
+ if (ctx->Driver.LightingSpaceChange)
+ ctx->Driver.LightingSpaceChange( ctx );
+ }
+ else {
+ GLuint new_state2 = ctx->NewState;
+
+ /* Recalculate that same state only if it has been invalidated
+ * by other statechanges.
+ */
+ if (new_state2 & _NEW_MODELVIEW)
+ update_modelview_scale(ctx);
+
+ if (new_state2 & (_NEW_LIGHT|_NEW_MODELVIEW))
+ compute_light_positions( ctx );
+ }
+}
+
+
+/**
+ * Drivers may need this if the hardware tnl unit doesn't support the
+ * light-in-modelspace optimization. It's also useful for debugging.
+ */
+void
+_mesa_allow_light_in_model( struct gl_context *ctx, GLboolean flag )
+{
+ ctx->_ForceEyeCoords = !flag;
+ ctx->NewState |= _NEW_POINT; /* one of the bits from
+ * _MESA_NEW_NEED_EYE_COORDS.
+ */
+}
+
+
+
+/**********************************************************************/
+/***** Initialization *****/
+/**********************************************************************/
+
+/**
+ * Initialize the n-th light data structure.
+ *
+ * \param l pointer to the gl_light structure to be initialized.
+ * \param n number of the light.
+ * \note The defaults for light 0 are different than the other lights.
+ */
+static void
+init_light( struct gl_light *l, GLuint n )
+{
+ make_empty_list( l );
+
+ ASSIGN_4V( l->Ambient, 0.0, 0.0, 0.0, 1.0 );
+ if (n==0) {
+ ASSIGN_4V( l->Diffuse, 1.0, 1.0, 1.0, 1.0 );
+ ASSIGN_4V( l->Specular, 1.0, 1.0, 1.0, 1.0 );
+ }
+ else {
+ ASSIGN_4V( l->Diffuse, 0.0, 0.0, 0.0, 1.0 );
+ ASSIGN_4V( l->Specular, 0.0, 0.0, 0.0, 1.0 );
+ }
+ ASSIGN_4V( l->EyePosition, 0.0, 0.0, 1.0, 0.0 );
+ ASSIGN_3V( l->SpotDirection, 0.0, 0.0, -1.0 );
+ l->SpotExponent = 0.0;
+ _mesa_invalidate_spot_exp_table( l );
+ l->SpotCutoff = 180.0;
+ l->_CosCutoffNeg = -1.0f;
+ l->_CosCutoff = 0.0; /* KW: -ve values not admitted */
+ l->ConstantAttenuation = 1.0;
+ l->LinearAttenuation = 0.0;
+ l->QuadraticAttenuation = 0.0;
+ l->Enabled = GL_FALSE;
+}
+
+
+/**
+ * Initialize the light model data structure.
+ *
+ * \param lm pointer to the gl_lightmodel structure to be initialized.
+ */
+static void
+init_lightmodel( struct gl_lightmodel *lm )
+{
+ ASSIGN_4V( lm->Ambient, 0.2F, 0.2F, 0.2F, 1.0F );
+ lm->LocalViewer = GL_FALSE;
+ lm->TwoSide = GL_FALSE;
+ lm->ColorControl = GL_SINGLE_COLOR;
+}
+
+
+/**
+ * Initialize the material data structure.
+ *
+ * \param m pointer to the gl_material structure to be initialized.
+ */
+static void
+init_material( struct gl_material *m )
+{
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_AMBIENT], 0.2F, 0.2F, 0.2F, 1.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_DIFFUSE], 0.8F, 0.8F, 0.8F, 1.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
+
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_AMBIENT], 0.2F, 0.2F, 0.2F, 1.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_DIFFUSE], 0.8F, 0.8F, 0.8F, 1.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
+ ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
+}
+
+
+/**
+ * Initialize all lighting state for the given context.
+ */
+void
+_mesa_init_lighting( struct gl_context *ctx )
+{
+ GLuint i;
+
+ /* Lighting group */
+ for (i = 0; i < MAX_LIGHTS; i++) {
+ init_light( &ctx->Light.Light[i], i );
+ }
+ make_empty_list( &ctx->Light.EnabledList );
+
+ init_lightmodel( &ctx->Light.Model );
+ init_material( &ctx->Light.Material );
+ ctx->Light.ShadeModel = GL_SMOOTH;
+ ctx->Light.ProvokingVertex = GL_LAST_VERTEX_CONVENTION_EXT;
+ ctx->Light.Enabled = GL_FALSE;
+ ctx->Light.ColorMaterialFace = GL_FRONT_AND_BACK;
+ ctx->Light.ColorMaterialMode = GL_AMBIENT_AND_DIFFUSE;
+ ctx->Light.ColorMaterialBitmask = _mesa_material_bitmask( ctx,
+ GL_FRONT_AND_BACK,
+ GL_AMBIENT_AND_DIFFUSE, ~0,
+ NULL );
+
+ ctx->Light.ColorMaterialEnabled = GL_FALSE;
+ ctx->Light.ClampVertexColor = GL_TRUE;
+
+ /* Lighting miscellaneous */
+ ctx->_ShineTabList = MALLOC_STRUCT( gl_shine_tab );
+ make_empty_list( ctx->_ShineTabList );
+ /* Allocate 10 (arbitrary) shininess lookup tables */
+ for (i = 0 ; i < 10 ; i++) {
+ struct gl_shine_tab *s = MALLOC_STRUCT( gl_shine_tab );
+ s->shininess = -1;
+ s->refcount = 0;
+ insert_at_tail( ctx->_ShineTabList, s );
+ }
+
+ /* Miscellaneous */
+ ctx->Light._NeedEyeCoords = GL_FALSE;
+ ctx->_NeedEyeCoords = GL_FALSE;
+ ctx->_ForceEyeCoords = GL_FALSE;
+ ctx->_ModelViewInvScale = 1.0;
+}
+
+
+/**
+ * Deallocate malloc'd lighting state attached to given context.
+ */
+void
+_mesa_free_lighting_data( struct gl_context *ctx )
+{
+ struct gl_shine_tab *s, *tmps;
+
+ /* Free lighting shininess exponentiation table */
+ foreach_s( s, tmps, ctx->_ShineTabList ) {
+ free( s );
+ }
+ free( ctx->_ShineTabList );
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 02:54:28 +0000