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-rw-r--r--mesalib/src/mesa/main/matrix.c1580
1 files changed, 787 insertions, 793 deletions
diff --git a/mesalib/src/mesa/main/matrix.c b/mesalib/src/mesa/main/matrix.c
index 4b8c00b5b..3fae85cad 100644
--- a/mesalib/src/mesa/main/matrix.c
+++ b/mesalib/src/mesa/main/matrix.c
@@ -1,793 +1,787 @@
-/*
- * 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.
- */
-
-
-/**
- * \file matrix.c
- * Matrix operations.
- *
- * \note
- * -# 4x4 transformation matrices are stored in memory in column major order.
- * -# Points/vertices are to be thought of as column vectors.
- * -# Transformation of a point p by a matrix M is: p' = M * p
- */
-
-
-#include "glheader.h"
-#include "imports.h"
-#include "context.h"
-#include "enums.h"
-#include "macros.h"
-#include "matrix.h"
-#include "mtypes.h"
-#include "math/m_matrix.h"
-
-
-/**
- * Apply a perspective projection matrix.
- *
- * \param left left clipping plane coordinate.
- * \param right right clipping plane coordinate.
- * \param bottom bottom clipping plane coordinate.
- * \param top top clipping plane coordinate.
- * \param nearval distance to the near clipping plane.
- * \param farval distance to the far clipping plane.
- *
- * \sa glFrustum().
- *
- * Flushes vertices and validates parameters. Calls _math_matrix_frustum() with
- * the top matrix of the current matrix stack and sets
- * __GLcontextRec::NewState.
- */
-void GLAPIENTRY
-_mesa_Frustum( GLdouble left, GLdouble right,
- GLdouble bottom, GLdouble top,
- GLdouble nearval, GLdouble farval )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
- if (nearval <= 0.0 ||
- farval <= 0.0 ||
- nearval == farval ||
- left == right ||
- top == bottom)
- {
- _mesa_error( ctx, GL_INVALID_VALUE, "glFrustum" );
- return;
- }
-
- _math_matrix_frustum( ctx->CurrentStack->Top,
- (GLfloat) left, (GLfloat) right,
- (GLfloat) bottom, (GLfloat) top,
- (GLfloat) nearval, (GLfloat) farval );
- ctx->NewState |= ctx->CurrentStack->DirtyFlag;
-}
-
-
-/**
- * Apply an orthographic projection matrix.
- *
- * \param left left clipping plane coordinate.
- * \param right right clipping plane coordinate.
- * \param bottom bottom clipping plane coordinate.
- * \param top top clipping plane coordinate.
- * \param nearval distance to the near clipping plane.
- * \param farval distance to the far clipping plane.
- *
- * \sa glOrtho().
- *
- * Flushes vertices and validates parameters. Calls _math_matrix_ortho() with
- * the top matrix of the current matrix stack and sets
- * __GLcontextRec::NewState.
- */
-void GLAPIENTRY
-_mesa_Ortho( GLdouble left, GLdouble right,
- GLdouble bottom, GLdouble top,
- GLdouble nearval, GLdouble farval )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
- left, right, bottom, top, nearval, farval);
-
- if (left == right ||
- bottom == top ||
- nearval == farval)
- {
- _mesa_error( ctx, GL_INVALID_VALUE, "glOrtho" );
- return;
- }
-
- _math_matrix_ortho( ctx->CurrentStack->Top,
- (GLfloat) left, (GLfloat) right,
- (GLfloat) bottom, (GLfloat) top,
- (GLfloat) nearval, (GLfloat) farval );
- ctx->NewState |= ctx->CurrentStack->DirtyFlag;
-}
-
-
-/**
- * Set the current matrix stack.
- *
- * \param mode matrix stack.
- *
- * \sa glMatrixMode().
- *
- * Flushes the vertices, validates the parameter and updates
- * __GLcontextRec::CurrentStack and gl_transform_attrib::MatrixMode with the
- * specified matrix stack.
- */
-void GLAPIENTRY
-_mesa_MatrixMode( GLenum mode )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (ctx->Transform.MatrixMode == mode && mode != GL_TEXTURE)
- return;
- FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
-
- switch (mode) {
- case GL_MODELVIEW:
- ctx->CurrentStack = &ctx->ModelviewMatrixStack;
- break;
- case GL_PROJECTION:
- ctx->CurrentStack = &ctx->ProjectionMatrixStack;
- break;
- case GL_TEXTURE:
- /* This error check is disabled because if we're called from
- * glPopAttrib() when the active texture unit is >= MaxTextureCoordUnits
- * we'll generate an unexpected error.
- * From the GL_ARB_vertex_shader spec it sounds like we should instead
- * do error checking in other places when we actually try to access
- * texture matrices beyond MaxTextureCoordUnits.
- */
-#if 0
- if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
- _mesa_error(ctx, GL_INVALID_OPERATION, "glMatrixMode(invalid tex unit %d)",
- ctx->Texture.CurrentUnit);
- return;
- }
-#endif
- ASSERT(ctx->Texture.CurrentUnit < Elements(ctx->TextureMatrixStack));
- ctx->CurrentStack = &ctx->TextureMatrixStack[ctx->Texture.CurrentUnit];
- break;
- case GL_COLOR:
- ctx->CurrentStack = &ctx->ColorMatrixStack;
- break;
- case GL_MATRIX0_NV:
- case GL_MATRIX1_NV:
- case GL_MATRIX2_NV:
- case GL_MATRIX3_NV:
- case GL_MATRIX4_NV:
- case GL_MATRIX5_NV:
- case GL_MATRIX6_NV:
- case GL_MATRIX7_NV:
- if (ctx->Extensions.NV_vertex_program) {
- ctx->CurrentStack = &ctx->ProgramMatrixStack[mode - GL_MATRIX0_NV];
- }
- else {
- _mesa_error( ctx, GL_INVALID_ENUM, "glMatrixMode(mode)" );
- return;
- }
- break;
- case GL_MATRIX0_ARB:
- case GL_MATRIX1_ARB:
- case GL_MATRIX2_ARB:
- case GL_MATRIX3_ARB:
- case GL_MATRIX4_ARB:
- case GL_MATRIX5_ARB:
- case GL_MATRIX6_ARB:
- case GL_MATRIX7_ARB:
- if (ctx->Extensions.ARB_vertex_program ||
- ctx->Extensions.ARB_fragment_program) {
- const GLuint m = mode - GL_MATRIX0_ARB;
- if (m > ctx->Const.MaxProgramMatrices) {
- _mesa_error(ctx, GL_INVALID_ENUM,
- "glMatrixMode(GL_MATRIX%d_ARB)", m);
- return;
- }
- ctx->CurrentStack = &ctx->ProgramMatrixStack[m];
- }
- else {
- _mesa_error( ctx, GL_INVALID_ENUM, "glMatrixMode(mode)" );
- return;
- }
- break;
- default:
- _mesa_error( ctx, GL_INVALID_ENUM, "glMatrixMode(mode)" );
- return;
- }
-
- ctx->Transform.MatrixMode = mode;
-}
-
-
-/**
- * Push the current matrix stack.
- *
- * \sa glPushMatrix().
- *
- * Verifies the current matrix stack is not full, and duplicates the top-most
- * matrix in the stack. Marks __GLcontextRec::NewState with the stack dirty
- * flag.
- */
-void GLAPIENTRY
-_mesa_PushMatrix( void )
-{
- GET_CURRENT_CONTEXT(ctx);
- struct gl_matrix_stack *stack = ctx->CurrentStack;
- ASSERT_OUTSIDE_BEGIN_END(ctx);
-
- if (MESA_VERBOSE&VERBOSE_API)
- _mesa_debug(ctx, "glPushMatrix %s\n",
- _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
-
- if (stack->Depth + 1 >= stack->MaxDepth) {
- if (ctx->Transform.MatrixMode == GL_TEXTURE) {
- _mesa_error(ctx, GL_STACK_OVERFLOW,
- "glPushMatrix(mode=GL_TEXTURE, unit=%d)",
- ctx->Texture.CurrentUnit);
- }
- else {
- _mesa_error(ctx, GL_STACK_OVERFLOW, "glPushMatrix(mode=%s)",
- _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
- }
- return;
- }
- _math_matrix_copy( &stack->Stack[stack->Depth + 1],
- &stack->Stack[stack->Depth] );
- stack->Depth++;
- stack->Top = &(stack->Stack[stack->Depth]);
- ctx->NewState |= stack->DirtyFlag;
-}
-
-
-/**
- * Pop the current matrix stack.
- *
- * \sa glPopMatrix().
- *
- * Flushes the vertices, verifies the current matrix stack is not empty, and
- * moves the stack head down. Marks __GLcontextRec::NewState with the dirty
- * stack flag.
- */
-void GLAPIENTRY
-_mesa_PopMatrix( void )
-{
- GET_CURRENT_CONTEXT(ctx);
- struct gl_matrix_stack *stack = ctx->CurrentStack;
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
- if (MESA_VERBOSE&VERBOSE_API)
- _mesa_debug(ctx, "glPopMatrix %s\n",
- _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
-
- if (stack->Depth == 0) {
- if (ctx->Transform.MatrixMode == GL_TEXTURE) {
- _mesa_error(ctx, GL_STACK_UNDERFLOW,
- "glPopMatrix(mode=GL_TEXTURE, unit=%d)",
- ctx->Texture.CurrentUnit);
- }
- else {
- _mesa_error(ctx, GL_STACK_UNDERFLOW, "glPopMatrix(mode=%s)",
- _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
- }
- return;
- }
- stack->Depth--;
- stack->Top = &(stack->Stack[stack->Depth]);
- ctx->NewState |= stack->DirtyFlag;
-}
-
-
-/**
- * Replace the current matrix with the identity matrix.
- *
- * \sa glLoadIdentity().
- *
- * Flushes the vertices and calls _math_matrix_set_identity() with the top-most
- * matrix in the current stack. Marks __GLcontextRec::NewState with the stack
- * dirty flag.
- */
-void GLAPIENTRY
-_mesa_LoadIdentity( void )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx, "glLoadIdentity()\n");
-
- _math_matrix_set_identity( ctx->CurrentStack->Top );
- ctx->NewState |= ctx->CurrentStack->DirtyFlag;
-}
-
-
-/**
- * Replace the current matrix with a given matrix.
- *
- * \param m matrix.
- *
- * \sa glLoadMatrixf().
- *
- * Flushes the vertices and calls _math_matrix_loadf() with the top-most matrix
- * in the current stack and the given matrix. Marks __GLcontextRec::NewState
- * with the dirty stack flag.
- */
-void GLAPIENTRY
-_mesa_LoadMatrixf( const GLfloat *m )
-{
- GET_CURRENT_CONTEXT(ctx);
- if (!m) return;
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx,
- "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
- m[0], m[4], m[8], m[12],
- m[1], m[5], m[9], m[13],
- m[2], m[6], m[10], m[14],
- m[3], m[7], m[11], m[15]);
-
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
- _math_matrix_loadf( ctx->CurrentStack->Top, m );
- ctx->NewState |= ctx->CurrentStack->DirtyFlag;
-}
-
-
-/**
- * Multiply the current matrix with a given matrix.
- *
- * \param m matrix.
- *
- * \sa glMultMatrixf().
- *
- * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
- * matrix in the current stack and the given matrix. Marks
- * __GLcontextRec::NewState with the dirty stack flag.
- */
-void GLAPIENTRY
-_mesa_MultMatrixf( const GLfloat *m )
-{
- GET_CURRENT_CONTEXT(ctx);
- if (!m) return;
- if (MESA_VERBOSE & VERBOSE_API)
- _mesa_debug(ctx,
- "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
- m[0], m[4], m[8], m[12],
- m[1], m[5], m[9], m[13],
- m[2], m[6], m[10], m[14],
- m[3], m[7], m[11], m[15]);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
- _math_matrix_mul_floats( ctx->CurrentStack->Top, m );
- ctx->NewState |= ctx->CurrentStack->DirtyFlag;
-}
-
-
-/**
- * Multiply the current matrix with a rotation matrix.
- *
- * \param angle angle of rotation, in degrees.
- * \param x rotation vector x coordinate.
- * \param y rotation vector y coordinate.
- * \param z rotation vector z coordinate.
- *
- * \sa glRotatef().
- *
- * Flushes the vertices and calls _math_matrix_rotate() with the top-most
- * matrix in the current stack and the given parameters. Marks
- * __GLcontextRec::NewState with the dirty stack flag.
- */
-void GLAPIENTRY
-_mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
- if (angle != 0.0F) {
- _math_matrix_rotate( ctx->CurrentStack->Top, angle, x, y, z);
- ctx->NewState |= ctx->CurrentStack->DirtyFlag;
- }
-}
-
-
-/**
- * Multiply the current matrix with a general scaling matrix.
- *
- * \param x x axis scale factor.
- * \param y y axis scale factor.
- * \param z z axis scale factor.
- *
- * \sa glScalef().
- *
- * Flushes the vertices and calls _math_matrix_scale() with the top-most
- * matrix in the current stack and the given parameters. Marks
- * __GLcontextRec::NewState with the dirty stack flag.
- */
-void GLAPIENTRY
-_mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
- _math_matrix_scale( ctx->CurrentStack->Top, x, y, z);
- ctx->NewState |= ctx->CurrentStack->DirtyFlag;
-}
-
-
-/**
- * Multiply the current matrix with a translation matrix.
- *
- * \param x translation vector x coordinate.
- * \param y translation vector y coordinate.
- * \param z translation vector z coordinate.
- *
- * \sa glTranslatef().
- *
- * Flushes the vertices and calls _math_matrix_translate() with the top-most
- * matrix in the current stack and the given parameters. Marks
- * __GLcontextRec::NewState with the dirty stack flag.
- */
-void GLAPIENTRY
-_mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
-{
- GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
- _math_matrix_translate( ctx->CurrentStack->Top, x, y, z);
- ctx->NewState |= ctx->CurrentStack->DirtyFlag;
-}
-
-
-#if _HAVE_FULL_GL
-void GLAPIENTRY
-_mesa_LoadMatrixd( const GLdouble *m )
-{
- GLint i;
- GLfloat f[16];
- if (!m) return;
- for (i = 0; i < 16; i++)
- f[i] = (GLfloat) m[i];
- _mesa_LoadMatrixf(f);
-}
-
-void GLAPIENTRY
-_mesa_MultMatrixd( const GLdouble *m )
-{
- GLint i;
- GLfloat f[16];
- if (!m) return;
- for (i = 0; i < 16; i++)
- f[i] = (GLfloat) m[i];
- _mesa_MultMatrixf( f );
-}
-
-
-void GLAPIENTRY
-_mesa_Rotated( GLdouble angle, GLdouble x, GLdouble y, GLdouble z )
-{
- _mesa_Rotatef((GLfloat) angle, (GLfloat) x, (GLfloat) y, (GLfloat) z);
-}
-
-
-void GLAPIENTRY
-_mesa_Scaled( GLdouble x, GLdouble y, GLdouble z )
-{
- _mesa_Scalef((GLfloat) x, (GLfloat) y, (GLfloat) z);
-}
-
-
-void GLAPIENTRY
-_mesa_Translated( GLdouble x, GLdouble y, GLdouble z )
-{
- _mesa_Translatef((GLfloat) x, (GLfloat) y, (GLfloat) z);
-}
-#endif
-
-
-#if _HAVE_FULL_GL
-void GLAPIENTRY
-_mesa_LoadTransposeMatrixfARB( const GLfloat *m )
-{
- GLfloat tm[16];
- if (!m) return;
- _math_transposef(tm, m);
- _mesa_LoadMatrixf(tm);
-}
-
-
-void GLAPIENTRY
-_mesa_LoadTransposeMatrixdARB( const GLdouble *m )
-{
- GLfloat tm[16];
- if (!m) return;
- _math_transposefd(tm, m);
- _mesa_LoadMatrixf(tm);
-}
-
-
-void GLAPIENTRY
-_mesa_MultTransposeMatrixfARB( const GLfloat *m )
-{
- GLfloat tm[16];
- if (!m) return;
- _math_transposef(tm, m);
- _mesa_MultMatrixf(tm);
-}
-
-
-void GLAPIENTRY
-_mesa_MultTransposeMatrixdARB( const GLdouble *m )
-{
- GLfloat tm[16];
- if (!m) return;
- _math_transposefd(tm, m);
- _mesa_MultMatrixf(tm);
-}
-#endif
-
-
-
-/**********************************************************************/
-/** \name State management */
-/*@{*/
-
-
-/**
- * Update the projection matrix stack.
- *
- * \param ctx GL context.
- *
- * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
- * stack, and recomputes user clip positions if necessary.
- *
- * \note This routine references __GLcontextRec::Tranform attribute values to
- * compute userclip positions in clip space, but is only called on
- * _NEW_PROJECTION. The _mesa_ClipPlane() function keeps these values up to
- * date across changes to the __GLcontextRec::Transform attributes.
- */
-static void
-update_projection( GLcontext *ctx )
-{
- _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
-
-#if FEATURE_userclip
- /* Recompute clip plane positions in clipspace. This is also done
- * in _mesa_ClipPlane().
- */
- if (ctx->Transform.ClipPlanesEnabled) {
- GLuint p;
- for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
- if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
- _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
- ctx->Transform.EyeUserPlane[p],
- ctx->ProjectionMatrixStack.Top->inv );
- }
- }
- }
-#endif
-}
-
-
-/**
- * Calculate the combined modelview-projection matrix.
- *
- * \param ctx GL context.
- *
- * Multiplies the top matrices of the projection and model view stacks into
- * __GLcontextRec::_ModelProjectMatrix via _math_matrix_mul_matrix() and
- * analyzes the resulting matrix via _math_matrix_analyse().
- */
-static void
-calculate_model_project_matrix( GLcontext *ctx )
-{
- _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
- ctx->ProjectionMatrixStack.Top,
- ctx->ModelviewMatrixStack.Top );
-
- _math_matrix_analyse( &ctx->_ModelProjectMatrix );
-}
-
-
-/**
- * Updates the combined modelview-projection matrix.
- *
- * \param ctx GL context.
- * \param new_state new state bit mask.
- *
- * If there is a new model view matrix then analyzes it. If there is a new
- * projection matrix, updates it. Finally calls
- * calculate_model_project_matrix() to recalculate the modelview-projection
- * matrix.
- */
-void _mesa_update_modelview_project( GLcontext *ctx, GLuint new_state )
-{
- if (new_state & _NEW_MODELVIEW) {
- _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
-
- /* Bring cull position uptodate.
- */
- TRANSFORM_POINT3( ctx->Transform.CullObjPos,
- ctx->ModelviewMatrixStack.Top->inv,
- ctx->Transform.CullEyePos );
- }
-
-
- if (new_state & _NEW_PROJECTION)
- update_projection( ctx );
-
- /* Keep ModelviewProject uptodate always to allow tnl
- * implementations that go model->clip even when eye is required.
- */
- calculate_model_project_matrix(ctx);
-}
-
-/*@}*/
-
-
-/**********************************************************************/
-/** Matrix stack initialization */
-/*@{*/
-
-
-/**
- * Initialize a matrix stack.
- *
- * \param stack matrix stack.
- * \param maxDepth maximum stack depth.
- * \param dirtyFlag dirty flag.
- *
- * Allocates an array of \p maxDepth elements for the matrix stack and calls
- * _math_matrix_ctr() and _math_matrix_alloc_inv() for each element to
- * initialize it.
- */
-static void
-init_matrix_stack( struct gl_matrix_stack *stack,
- GLuint maxDepth, GLuint dirtyFlag )
-{
- GLuint i;
-
- stack->Depth = 0;
- stack->MaxDepth = maxDepth;
- stack->DirtyFlag = dirtyFlag;
- /* The stack */
- stack->Stack = (GLmatrix *) CALLOC(maxDepth * sizeof(GLmatrix));
- for (i = 0; i < maxDepth; i++) {
- _math_matrix_ctr(&stack->Stack[i]);
- _math_matrix_alloc_inv(&stack->Stack[i]);
- }
- stack->Top = stack->Stack;
-}
-
-/**
- * Free matrix stack.
- *
- * \param stack matrix stack.
- *
- * Calls _math_matrix_dtr() for each element of the matrix stack and
- * frees the array.
- */
-static void
-free_matrix_stack( struct gl_matrix_stack *stack )
-{
- GLuint i;
- for (i = 0; i < stack->MaxDepth; i++) {
- _math_matrix_dtr(&stack->Stack[i]);
- }
- FREE(stack->Stack);
- stack->Stack = stack->Top = NULL;
-}
-
-/*@}*/
-
-
-/**********************************************************************/
-/** \name Initialization */
-/*@{*/
-
-
-/**
- * Initialize the context matrix data.
- *
- * \param ctx GL context.
- *
- * Initializes each of the matrix stacks and the combined modelview-projection
- * matrix.
- */
-void _mesa_init_matrix( GLcontext * ctx )
-{
- GLint i;
-
- /* Initialize matrix stacks */
- init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH,
- _NEW_MODELVIEW);
- init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH,
- _NEW_PROJECTION);
- init_matrix_stack(&ctx->ColorMatrixStack, MAX_COLOR_STACK_DEPTH,
- _NEW_COLOR_MATRIX);
- for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
- init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH,
- _NEW_TEXTURE_MATRIX);
- for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
- init_matrix_stack(&ctx->ProgramMatrixStack[i],
- MAX_PROGRAM_MATRIX_STACK_DEPTH, _NEW_TRACK_MATRIX);
- ctx->CurrentStack = &ctx->ModelviewMatrixStack;
-
- /* Init combined Modelview*Projection matrix */
- _math_matrix_ctr( &ctx->_ModelProjectMatrix );
-}
-
-
-/**
- * Free the context matrix data.
- *
- * \param ctx GL context.
- *
- * Frees each of the matrix stacks and the combined modelview-projection
- * matrix.
- */
-void _mesa_free_matrix_data( GLcontext *ctx )
-{
- GLint i;
-
- free_matrix_stack(&ctx->ModelviewMatrixStack);
- free_matrix_stack(&ctx->ProjectionMatrixStack);
- free_matrix_stack(&ctx->ColorMatrixStack);
- for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
- free_matrix_stack(&ctx->TextureMatrixStack[i]);
- for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
- free_matrix_stack(&ctx->ProgramMatrixStack[i]);
- /* combined Modelview*Projection matrix */
- _math_matrix_dtr( &ctx->_ModelProjectMatrix );
-
-}
-
-
-/**
- * Initialize the context transform attribute group.
- *
- * \param ctx GL context.
- *
- * \todo Move this to a new file with other 'transform' routines.
- */
-void _mesa_init_transform( GLcontext *ctx )
-{
- GLint i;
-
- /* Transformation group */
- ctx->Transform.MatrixMode = GL_MODELVIEW;
- ctx->Transform.Normalize = GL_FALSE;
- ctx->Transform.RescaleNormals = GL_FALSE;
- ctx->Transform.RasterPositionUnclipped = GL_FALSE;
- for (i=0;i<MAX_CLIP_PLANES;i++) {
- ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
- }
- ctx->Transform.ClipPlanesEnabled = 0;
-
- ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 );
- ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 );
-}
-
-
-/*@}*/
+/*
+ * 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.
+ */
+
+
+/**
+ * \file matrix.c
+ * Matrix operations.
+ *
+ * \note
+ * -# 4x4 transformation matrices are stored in memory in column major order.
+ * -# Points/vertices are to be thought of as column vectors.
+ * -# Transformation of a point p by a matrix M is: p' = M * p
+ */
+
+
+#include "glheader.h"
+#include "imports.h"
+#include "context.h"
+#include "enums.h"
+#include "macros.h"
+#include "matrix.h"
+#include "mtypes.h"
+#include "math/m_matrix.h"
+
+
+/**
+ * Apply a perspective projection matrix.
+ *
+ * \param left left clipping plane coordinate.
+ * \param right right clipping plane coordinate.
+ * \param bottom bottom clipping plane coordinate.
+ * \param top top clipping plane coordinate.
+ * \param nearval distance to the near clipping plane.
+ * \param farval distance to the far clipping plane.
+ *
+ * \sa glFrustum().
+ *
+ * Flushes vertices and validates parameters. Calls _math_matrix_frustum() with
+ * the top matrix of the current matrix stack and sets
+ * __struct gl_contextRec::NewState.
+ */
+void GLAPIENTRY
+_mesa_Frustum( GLdouble left, GLdouble right,
+ GLdouble bottom, GLdouble top,
+ GLdouble nearval, GLdouble farval )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ if (nearval <= 0.0 ||
+ farval <= 0.0 ||
+ nearval == farval ||
+ left == right ||
+ top == bottom)
+ {
+ _mesa_error( ctx, GL_INVALID_VALUE, "glFrustum" );
+ return;
+ }
+
+ _math_matrix_frustum( ctx->CurrentStack->Top,
+ (GLfloat) left, (GLfloat) right,
+ (GLfloat) bottom, (GLfloat) top,
+ (GLfloat) nearval, (GLfloat) farval );
+ ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+}
+
+
+/**
+ * Apply an orthographic projection matrix.
+ *
+ * \param left left clipping plane coordinate.
+ * \param right right clipping plane coordinate.
+ * \param bottom bottom clipping plane coordinate.
+ * \param top top clipping plane coordinate.
+ * \param nearval distance to the near clipping plane.
+ * \param farval distance to the far clipping plane.
+ *
+ * \sa glOrtho().
+ *
+ * Flushes vertices and validates parameters. Calls _math_matrix_ortho() with
+ * the top matrix of the current matrix stack and sets
+ * __struct gl_contextRec::NewState.
+ */
+void GLAPIENTRY
+_mesa_Ortho( GLdouble left, GLdouble right,
+ GLdouble bottom, GLdouble top,
+ GLdouble nearval, GLdouble farval )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
+ left, right, bottom, top, nearval, farval);
+
+ if (left == right ||
+ bottom == top ||
+ nearval == farval)
+ {
+ _mesa_error( ctx, GL_INVALID_VALUE, "glOrtho" );
+ return;
+ }
+
+ _math_matrix_ortho( ctx->CurrentStack->Top,
+ (GLfloat) left, (GLfloat) right,
+ (GLfloat) bottom, (GLfloat) top,
+ (GLfloat) nearval, (GLfloat) farval );
+ ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+}
+
+
+/**
+ * Set the current matrix stack.
+ *
+ * \param mode matrix stack.
+ *
+ * \sa glMatrixMode().
+ *
+ * Flushes the vertices, validates the parameter and updates
+ * __struct gl_contextRec::CurrentStack and gl_transform_attrib::MatrixMode with the
+ * specified matrix stack.
+ */
+void GLAPIENTRY
+_mesa_MatrixMode( GLenum mode )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (ctx->Transform.MatrixMode == mode && mode != GL_TEXTURE)
+ return;
+ FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
+
+ switch (mode) {
+ case GL_MODELVIEW:
+ ctx->CurrentStack = &ctx->ModelviewMatrixStack;
+ break;
+ case GL_PROJECTION:
+ ctx->CurrentStack = &ctx->ProjectionMatrixStack;
+ break;
+ case GL_TEXTURE:
+ /* This error check is disabled because if we're called from
+ * glPopAttrib() when the active texture unit is >= MaxTextureCoordUnits
+ * we'll generate an unexpected error.
+ * From the GL_ARB_vertex_shader spec it sounds like we should instead
+ * do error checking in other places when we actually try to access
+ * texture matrices beyond MaxTextureCoordUnits.
+ */
+#if 0
+ if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glMatrixMode(invalid tex unit %d)",
+ ctx->Texture.CurrentUnit);
+ return;
+ }
+#endif
+ ASSERT(ctx->Texture.CurrentUnit < Elements(ctx->TextureMatrixStack));
+ ctx->CurrentStack = &ctx->TextureMatrixStack[ctx->Texture.CurrentUnit];
+ break;
+ case GL_MATRIX0_NV:
+ case GL_MATRIX1_NV:
+ case GL_MATRIX2_NV:
+ case GL_MATRIX3_NV:
+ case GL_MATRIX4_NV:
+ case GL_MATRIX5_NV:
+ case GL_MATRIX6_NV:
+ case GL_MATRIX7_NV:
+ if (ctx->Extensions.NV_vertex_program) {
+ ctx->CurrentStack = &ctx->ProgramMatrixStack[mode - GL_MATRIX0_NV];
+ }
+ else {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glMatrixMode(mode)" );
+ return;
+ }
+ break;
+ case GL_MATRIX0_ARB:
+ case GL_MATRIX1_ARB:
+ case GL_MATRIX2_ARB:
+ case GL_MATRIX3_ARB:
+ case GL_MATRIX4_ARB:
+ case GL_MATRIX5_ARB:
+ case GL_MATRIX6_ARB:
+ case GL_MATRIX7_ARB:
+ if (ctx->Extensions.ARB_vertex_program ||
+ ctx->Extensions.ARB_fragment_program) {
+ const GLuint m = mode - GL_MATRIX0_ARB;
+ if (m > ctx->Const.MaxProgramMatrices) {
+ _mesa_error(ctx, GL_INVALID_ENUM,
+ "glMatrixMode(GL_MATRIX%d_ARB)", m);
+ return;
+ }
+ ctx->CurrentStack = &ctx->ProgramMatrixStack[m];
+ }
+ else {
+ _mesa_error( ctx, GL_INVALID_ENUM, "glMatrixMode(mode)" );
+ return;
+ }
+ break;
+ default:
+ _mesa_error( ctx, GL_INVALID_ENUM, "glMatrixMode(mode)" );
+ return;
+ }
+
+ ctx->Transform.MatrixMode = mode;
+}
+
+
+/**
+ * Push the current matrix stack.
+ *
+ * \sa glPushMatrix().
+ *
+ * Verifies the current matrix stack is not full, and duplicates the top-most
+ * matrix in the stack. Marks __struct gl_contextRec::NewState with the stack dirty
+ * flag.
+ */
+void GLAPIENTRY
+_mesa_PushMatrix( void )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_matrix_stack *stack = ctx->CurrentStack;
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (MESA_VERBOSE&VERBOSE_API)
+ _mesa_debug(ctx, "glPushMatrix %s\n",
+ _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
+
+ if (stack->Depth + 1 >= stack->MaxDepth) {
+ if (ctx->Transform.MatrixMode == GL_TEXTURE) {
+ _mesa_error(ctx, GL_STACK_OVERFLOW,
+ "glPushMatrix(mode=GL_TEXTURE, unit=%d)",
+ ctx->Texture.CurrentUnit);
+ }
+ else {
+ _mesa_error(ctx, GL_STACK_OVERFLOW, "glPushMatrix(mode=%s)",
+ _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
+ }
+ return;
+ }
+ _math_matrix_copy( &stack->Stack[stack->Depth + 1],
+ &stack->Stack[stack->Depth] );
+ stack->Depth++;
+ stack->Top = &(stack->Stack[stack->Depth]);
+ ctx->NewState |= stack->DirtyFlag;
+}
+
+
+/**
+ * Pop the current matrix stack.
+ *
+ * \sa glPopMatrix().
+ *
+ * Flushes the vertices, verifies the current matrix stack is not empty, and
+ * moves the stack head down. Marks __struct gl_contextRec::NewState with the dirty
+ * stack flag.
+ */
+void GLAPIENTRY
+_mesa_PopMatrix( void )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ struct gl_matrix_stack *stack = ctx->CurrentStack;
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ if (MESA_VERBOSE&VERBOSE_API)
+ _mesa_debug(ctx, "glPopMatrix %s\n",
+ _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
+
+ if (stack->Depth == 0) {
+ if (ctx->Transform.MatrixMode == GL_TEXTURE) {
+ _mesa_error(ctx, GL_STACK_UNDERFLOW,
+ "glPopMatrix(mode=GL_TEXTURE, unit=%d)",
+ ctx->Texture.CurrentUnit);
+ }
+ else {
+ _mesa_error(ctx, GL_STACK_UNDERFLOW, "glPopMatrix(mode=%s)",
+ _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
+ }
+ return;
+ }
+ stack->Depth--;
+ stack->Top = &(stack->Stack[stack->Depth]);
+ ctx->NewState |= stack->DirtyFlag;
+}
+
+
+/**
+ * Replace the current matrix with the identity matrix.
+ *
+ * \sa glLoadIdentity().
+ *
+ * Flushes the vertices and calls _math_matrix_set_identity() with the top-most
+ * matrix in the current stack. Marks __struct gl_contextRec::NewState with the stack
+ * dirty flag.
+ */
+void GLAPIENTRY
+_mesa_LoadIdentity( void )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glLoadIdentity()\n");
+
+ _math_matrix_set_identity( ctx->CurrentStack->Top );
+ ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+}
+
+
+/**
+ * Replace the current matrix with a given matrix.
+ *
+ * \param m matrix.
+ *
+ * \sa glLoadMatrixf().
+ *
+ * Flushes the vertices and calls _math_matrix_loadf() with the top-most matrix
+ * in the current stack and the given matrix. Marks __struct gl_contextRec::NewState
+ * with the dirty stack flag.
+ */
+void GLAPIENTRY
+_mesa_LoadMatrixf( const GLfloat *m )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ if (!m) return;
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx,
+ "glLoadMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
+ m[0], m[4], m[8], m[12],
+ m[1], m[5], m[9], m[13],
+ m[2], m[6], m[10], m[14],
+ m[3], m[7], m[11], m[15]);
+
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+ _math_matrix_loadf( ctx->CurrentStack->Top, m );
+ ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+}
+
+
+/**
+ * Multiply the current matrix with a given matrix.
+ *
+ * \param m matrix.
+ *
+ * \sa glMultMatrixf().
+ *
+ * Flushes the vertices and calls _math_matrix_mul_floats() with the top-most
+ * matrix in the current stack and the given matrix. Marks
+ * __struct gl_contextRec::NewState with the dirty stack flag.
+ */
+void GLAPIENTRY
+_mesa_MultMatrixf( const GLfloat *m )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ if (!m) return;
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx,
+ "glMultMatrix(%f %f %f %f, %f %f %f %f, %f %f %f %f, %f %f %f %f\n",
+ m[0], m[4], m[8], m[12],
+ m[1], m[5], m[9], m[13],
+ m[2], m[6], m[10], m[14],
+ m[3], m[7], m[11], m[15]);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+ _math_matrix_mul_floats( ctx->CurrentStack->Top, m );
+ ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+}
+
+
+/**
+ * Multiply the current matrix with a rotation matrix.
+ *
+ * \param angle angle of rotation, in degrees.
+ * \param x rotation vector x coordinate.
+ * \param y rotation vector y coordinate.
+ * \param z rotation vector z coordinate.
+ *
+ * \sa glRotatef().
+ *
+ * Flushes the vertices and calls _math_matrix_rotate() with the top-most
+ * matrix in the current stack and the given parameters. Marks
+ * __struct gl_contextRec::NewState with the dirty stack flag.
+ */
+void GLAPIENTRY
+_mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+ if (angle != 0.0F) {
+ _math_matrix_rotate( ctx->CurrentStack->Top, angle, x, y, z);
+ ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+ }
+}
+
+
+/**
+ * Multiply the current matrix with a general scaling matrix.
+ *
+ * \param x x axis scale factor.
+ * \param y y axis scale factor.
+ * \param z z axis scale factor.
+ *
+ * \sa glScalef().
+ *
+ * Flushes the vertices and calls _math_matrix_scale() with the top-most
+ * matrix in the current stack and the given parameters. Marks
+ * __struct gl_contextRec::NewState with the dirty stack flag.
+ */
+void GLAPIENTRY
+_mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+ _math_matrix_scale( ctx->CurrentStack->Top, x, y, z);
+ ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+}
+
+
+/**
+ * Multiply the current matrix with a translation matrix.
+ *
+ * \param x translation vector x coordinate.
+ * \param y translation vector y coordinate.
+ * \param z translation vector z coordinate.
+ *
+ * \sa glTranslatef().
+ *
+ * Flushes the vertices and calls _math_matrix_translate() with the top-most
+ * matrix in the current stack and the given parameters. Marks
+ * __struct gl_contextRec::NewState with the dirty stack flag.
+ */
+void GLAPIENTRY
+_mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+ _math_matrix_translate( ctx->CurrentStack->Top, x, y, z);
+ ctx->NewState |= ctx->CurrentStack->DirtyFlag;
+}
+
+
+#if _HAVE_FULL_GL
+void GLAPIENTRY
+_mesa_LoadMatrixd( const GLdouble *m )
+{
+ GLint i;
+ GLfloat f[16];
+ if (!m) return;
+ for (i = 0; i < 16; i++)
+ f[i] = (GLfloat) m[i];
+ _mesa_LoadMatrixf(f);
+}
+
+void GLAPIENTRY
+_mesa_MultMatrixd( const GLdouble *m )
+{
+ GLint i;
+ GLfloat f[16];
+ if (!m) return;
+ for (i = 0; i < 16; i++)
+ f[i] = (GLfloat) m[i];
+ _mesa_MultMatrixf( f );
+}
+
+
+void GLAPIENTRY
+_mesa_Rotated( GLdouble angle, GLdouble x, GLdouble y, GLdouble z )
+{
+ _mesa_Rotatef((GLfloat) angle, (GLfloat) x, (GLfloat) y, (GLfloat) z);
+}
+
+
+void GLAPIENTRY
+_mesa_Scaled( GLdouble x, GLdouble y, GLdouble z )
+{
+ _mesa_Scalef((GLfloat) x, (GLfloat) y, (GLfloat) z);
+}
+
+
+void GLAPIENTRY
+_mesa_Translated( GLdouble x, GLdouble y, GLdouble z )
+{
+ _mesa_Translatef((GLfloat) x, (GLfloat) y, (GLfloat) z);
+}
+#endif
+
+
+#if _HAVE_FULL_GL
+void GLAPIENTRY
+_mesa_LoadTransposeMatrixfARB( const GLfloat *m )
+{
+ GLfloat tm[16];
+ if (!m) return;
+ _math_transposef(tm, m);
+ _mesa_LoadMatrixf(tm);
+}
+
+
+void GLAPIENTRY
+_mesa_LoadTransposeMatrixdARB( const GLdouble *m )
+{
+ GLfloat tm[16];
+ if (!m) return;
+ _math_transposefd(tm, m);
+ _mesa_LoadMatrixf(tm);
+}
+
+
+void GLAPIENTRY
+_mesa_MultTransposeMatrixfARB( const GLfloat *m )
+{
+ GLfloat tm[16];
+ if (!m) return;
+ _math_transposef(tm, m);
+ _mesa_MultMatrixf(tm);
+}
+
+
+void GLAPIENTRY
+_mesa_MultTransposeMatrixdARB( const GLdouble *m )
+{
+ GLfloat tm[16];
+ if (!m) return;
+ _math_transposefd(tm, m);
+ _mesa_MultMatrixf(tm);
+}
+#endif
+
+
+
+/**********************************************************************/
+/** \name State management */
+/*@{*/
+
+
+/**
+ * Update the projection matrix stack.
+ *
+ * \param ctx GL context.
+ *
+ * Calls _math_matrix_analyse() with the top-matrix of the projection matrix
+ * stack, and recomputes user clip positions if necessary.
+ *
+ * \note This routine references __struct gl_contextRec::Tranform attribute values to
+ * compute userclip positions in clip space, but is only called on
+ * _NEW_PROJECTION. The _mesa_ClipPlane() function keeps these values up to
+ * date across changes to the __struct gl_contextRec::Transform attributes.
+ */
+static void
+update_projection( struct gl_context *ctx )
+{
+ _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
+
+#if FEATURE_userclip
+ /* Recompute clip plane positions in clipspace. This is also done
+ * in _mesa_ClipPlane().
+ */
+ if (ctx->Transform.ClipPlanesEnabled) {
+ GLuint p;
+ for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
+ if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+ _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
+ ctx->Transform.EyeUserPlane[p],
+ ctx->ProjectionMatrixStack.Top->inv );
+ }
+ }
+ }
+#endif
+}
+
+
+/**
+ * Calculate the combined modelview-projection matrix.
+ *
+ * \param ctx GL context.
+ *
+ * Multiplies the top matrices of the projection and model view stacks into
+ * __struct gl_contextRec::_ModelProjectMatrix via _math_matrix_mul_matrix() and
+ * analyzes the resulting matrix via _math_matrix_analyse().
+ */
+static void
+calculate_model_project_matrix( struct gl_context *ctx )
+{
+ _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
+ ctx->ProjectionMatrixStack.Top,
+ ctx->ModelviewMatrixStack.Top );
+
+ _math_matrix_analyse( &ctx->_ModelProjectMatrix );
+}
+
+
+/**
+ * Updates the combined modelview-projection matrix.
+ *
+ * \param ctx GL context.
+ * \param new_state new state bit mask.
+ *
+ * If there is a new model view matrix then analyzes it. If there is a new
+ * projection matrix, updates it. Finally calls
+ * calculate_model_project_matrix() to recalculate the modelview-projection
+ * matrix.
+ */
+void _mesa_update_modelview_project( struct gl_context *ctx, GLuint new_state )
+{
+ if (new_state & _NEW_MODELVIEW) {
+ _math_matrix_analyse( ctx->ModelviewMatrixStack.Top );
+
+ /* Bring cull position uptodate.
+ */
+ TRANSFORM_POINT3( ctx->Transform.CullObjPos,
+ ctx->ModelviewMatrixStack.Top->inv,
+ ctx->Transform.CullEyePos );
+ }
+
+
+ if (new_state & _NEW_PROJECTION)
+ update_projection( ctx );
+
+ /* Keep ModelviewProject uptodate always to allow tnl
+ * implementations that go model->clip even when eye is required.
+ */
+ calculate_model_project_matrix(ctx);
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** Matrix stack initialization */
+/*@{*/
+
+
+/**
+ * Initialize a matrix stack.
+ *
+ * \param stack matrix stack.
+ * \param maxDepth maximum stack depth.
+ * \param dirtyFlag dirty flag.
+ *
+ * Allocates an array of \p maxDepth elements for the matrix stack and calls
+ * _math_matrix_ctr() and _math_matrix_alloc_inv() for each element to
+ * initialize it.
+ */
+static void
+init_matrix_stack( struct gl_matrix_stack *stack,
+ GLuint maxDepth, GLuint dirtyFlag )
+{
+ GLuint i;
+
+ stack->Depth = 0;
+ stack->MaxDepth = maxDepth;
+ stack->DirtyFlag = dirtyFlag;
+ /* The stack */
+ stack->Stack = (GLmatrix *) CALLOC(maxDepth * sizeof(GLmatrix));
+ for (i = 0; i < maxDepth; i++) {
+ _math_matrix_ctr(&stack->Stack[i]);
+ _math_matrix_alloc_inv(&stack->Stack[i]);
+ }
+ stack->Top = stack->Stack;
+}
+
+/**
+ * Free matrix stack.
+ *
+ * \param stack matrix stack.
+ *
+ * Calls _math_matrix_dtr() for each element of the matrix stack and
+ * frees the array.
+ */
+static void
+free_matrix_stack( struct gl_matrix_stack *stack )
+{
+ GLuint i;
+ for (i = 0; i < stack->MaxDepth; i++) {
+ _math_matrix_dtr(&stack->Stack[i]);
+ }
+ FREE(stack->Stack);
+ stack->Stack = stack->Top = NULL;
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** \name Initialization */
+/*@{*/
+
+
+/**
+ * Initialize the context matrix data.
+ *
+ * \param ctx GL context.
+ *
+ * Initializes each of the matrix stacks and the combined modelview-projection
+ * matrix.
+ */
+void _mesa_init_matrix( struct gl_context * ctx )
+{
+ GLint i;
+
+ /* Initialize matrix stacks */
+ init_matrix_stack(&ctx->ModelviewMatrixStack, MAX_MODELVIEW_STACK_DEPTH,
+ _NEW_MODELVIEW);
+ init_matrix_stack(&ctx->ProjectionMatrixStack, MAX_PROJECTION_STACK_DEPTH,
+ _NEW_PROJECTION);
+ for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
+ init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH,
+ _NEW_TEXTURE_MATRIX);
+ for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
+ init_matrix_stack(&ctx->ProgramMatrixStack[i],
+ MAX_PROGRAM_MATRIX_STACK_DEPTH, _NEW_TRACK_MATRIX);
+ ctx->CurrentStack = &ctx->ModelviewMatrixStack;
+
+ /* Init combined Modelview*Projection matrix */
+ _math_matrix_ctr( &ctx->_ModelProjectMatrix );
+}
+
+
+/**
+ * Free the context matrix data.
+ *
+ * \param ctx GL context.
+ *
+ * Frees each of the matrix stacks and the combined modelview-projection
+ * matrix.
+ */
+void _mesa_free_matrix_data( struct gl_context *ctx )
+{
+ GLint i;
+
+ free_matrix_stack(&ctx->ModelviewMatrixStack);
+ free_matrix_stack(&ctx->ProjectionMatrixStack);
+ for (i = 0; i < Elements(ctx->TextureMatrixStack); i++)
+ free_matrix_stack(&ctx->TextureMatrixStack[i]);
+ for (i = 0; i < Elements(ctx->ProgramMatrixStack); i++)
+ free_matrix_stack(&ctx->ProgramMatrixStack[i]);
+ /* combined Modelview*Projection matrix */
+ _math_matrix_dtr( &ctx->_ModelProjectMatrix );
+
+}
+
+
+/**
+ * Initialize the context transform attribute group.
+ *
+ * \param ctx GL context.
+ *
+ * \todo Move this to a new file with other 'transform' routines.
+ */
+void _mesa_init_transform( struct gl_context *ctx )
+{
+ GLint i;
+
+ /* Transformation group */
+ ctx->Transform.MatrixMode = GL_MODELVIEW;
+ ctx->Transform.Normalize = GL_FALSE;
+ ctx->Transform.RescaleNormals = GL_FALSE;
+ ctx->Transform.RasterPositionUnclipped = GL_FALSE;
+ for (i=0;i<MAX_CLIP_PLANES;i++) {
+ ASSIGN_4V( ctx->Transform.EyeUserPlane[i], 0.0, 0.0, 0.0, 0.0 );
+ }
+ ctx->Transform.ClipPlanesEnabled = 0;
+
+ ASSIGN_4V( ctx->Transform.CullObjPos, 0.0, 0.0, 1.0, 0.0 );
+ ASSIGN_4V( ctx->Transform.CullEyePos, 0.0, 0.0, 1.0, 0.0 );
+}
+
+
+/*@}*/