Added MesaLib-7.6

1 files changed, 1427 insertions, 0 deletions

diff --git a/mesalib/src/mesa/main/light.c b/mesalib/src/mesa/main/light.c
new file mode 100644
index 000000000..10c89f436
--- /dev/null
+++ b/mesalib/src/mesa/main/light.c
@@ -0,0 +1,1427 @@
+/*
+ * 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(GLcontext *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) (_mesa_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 )
+{
+   _mesa_Lightfv( light, pname, &param );
+}
+
+
+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 )
+{
+   _mesa_Lightiv( light, pname, &param );
+}
+
+
+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 )
+{
+   _mesa_LightModeliv( pname, &param );
+}
+
+
+void GLAPIENTRY
+_mesa_LightModelf( GLenum pname, GLfloat param )
+{
+   _mesa_LightModelfv( pname, &param );
+}
+
+
+
+/********** MATERIAL **********/
+
+
+/*
+ * Given a face and pname value (ala glColorMaterial), compute a bitmask
+ * of the targeted material values.
+ */
+GLuint
+_mesa_material_bitmask( GLcontext *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, 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, where );
+      return 0;
+   }
+
+   if (bitmask & ~legal) {
+      _mesa_error( ctx, GL_INVALID_ENUM, 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( GLcontext *ctx, GLuint bitmask )
+{
+   struct gl_light *light, *list = &ctx->Light.EnabledList;
+   GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
+
+   if (MESA_VERBOSE&VERBOSE_IMMEDIATE) 
+      _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( GLcontext *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 = _mesa_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( GLcontext *ctx, GLuint side )
+{
+   ASSERT(side < 2);
+   if (ctx->_ShineTable[side])
+      ctx->_ShineTable[side]->refcount--;
+   ctx->_ShineTable[side] = NULL;
+}
+
+
+static void
+validate_shine_table( GLcontext *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 = _mesa_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( GLcontext *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( GLcontext *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->Visual.rgbMode) {
+      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);
+   }
+   else {
+      static const GLfloat ci[3] = { .30F, .59F, .11F };
+      foreach(light, &ctx->Light.EnabledList) {
+	 light->_dli = DOT3(ci, light->Diffuse);
+	 light->_sli = DOT3(ci, light->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( GLcontext *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( GLcontext *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( GLcontext *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( GLcontext *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( GLcontext *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( GLcontext *ctx )
+{
+   struct gl_shine_tab *s, *tmps;
+
+   /* Free lighting shininess exponentiation table */
+   foreach_s( s, tmps, ctx->_ShineTabList ) {
+      _mesa_free( s );
+   }
+   _mesa_free( ctx->_ShineTabList );
+}