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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.3
+ *
+ * Copyright (C) 1999-2005 Brian Paul 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"
+#include "math/m_xform.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:
+ if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glMatrixMode(texcoord unit)");
+ return;
+ }
+ 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 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 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()");
+
+ _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 general scaling 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
+
+/**
+ * Set the viewport.
+ *
+ * \param x, y coordinates of the lower-left corner of the viewport rectangle.
+ * \param width width of the viewport rectangle.
+ * \param height height of the viewport rectangle.
+ *
+ * \sa Called via glViewport() or display list execution.
+ *
+ * Flushes the vertices and calls _mesa_set_viewport() with the given
+ * parameters.
+ */
+void GLAPIENTRY
+_mesa_Viewport( GLint x, GLint y, GLsizei width, GLsizei height )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+ _mesa_set_viewport(ctx, x, y, width, height);
+}
+
+
+/**
+ * Set new viewport parameters and update derived state (the _WindowMap
+ * matrix). Usually called from _mesa_Viewport().
+ *
+ * \param ctx GL context.
+ * \param x, y coordinates of the lower left corner of the viewport rectangle.
+ * \param width width of the viewport rectangle.
+ * \param height height of the viewport rectangle.
+ */
+void
+_mesa_set_viewport( GLcontext *ctx, GLint x, GLint y,
+ GLsizei width, GLsizei height )
+{
+ if (MESA_VERBOSE & VERBOSE_API)
+ _mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height);
+
+ if (width < 0 || height < 0) {
+ _mesa_error( ctx, GL_INVALID_VALUE,
+ "glViewport(%d, %d, %d, %d)", x, y, width, height );
+ return;
+ }
+
+ /* clamp width and height to the implementation dependent range */
+ width = CLAMP(width, 1, (GLsizei) ctx->Const.MaxViewportWidth);
+ height = CLAMP(height, 1, (GLsizei) ctx->Const.MaxViewportHeight);
+
+ ctx->Viewport.X = x;
+ ctx->Viewport.Width = width;
+ ctx->Viewport.Y = y;
+ ctx->Viewport.Height = height;
+ ctx->NewState |= _NEW_VIEWPORT;
+
+#if 1
+ /* XXX remove this someday. Currently the DRI drivers rely on
+ * the WindowMap matrix being up to date in the driver's Viewport
+ * and DepthRange functions.
+ */
+ _math_matrix_viewport(&ctx->Viewport._WindowMap,
+ ctx->Viewport.X, ctx->Viewport.Y,
+ ctx->Viewport.Width, ctx->Viewport.Height,
+ ctx->Viewport.Near, ctx->Viewport.Far,
+ ctx->DrawBuffer->_DepthMaxF);
+#endif
+
+ if (ctx->Driver.Viewport) {
+ /* Many drivers will use this call to check for window size changes
+ * and reallocate the z/stencil/accum/etc buffers if needed.
+ */
+ (*ctx->Driver.Viewport)( ctx, x, y, width, height );
+ }
+}
+
+
+#if _HAVE_FULL_GL
+/**
+ * Called by glDepthRange
+ *
+ * \param nearval specifies the Z buffer value which should correspond to
+ * the near clip plane
+ * \param farval specifies the Z buffer value which should correspond to
+ * the far clip plane
+ */
+void GLAPIENTRY
+_mesa_DepthRange( GLclampd nearval, GLclampd farval )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+
+ if (MESA_VERBOSE&VERBOSE_API)
+ _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
+
+ ctx->Viewport.Near = (GLfloat) CLAMP( nearval, 0.0, 1.0 );
+ ctx->Viewport.Far = (GLfloat) CLAMP( farval, 0.0, 1.0 );
+ ctx->NewState |= _NEW_VIEWPORT;
+
+#if 1
+ /* XXX remove this someday. Currently the DRI drivers rely on
+ * the WindowMap matrix being up to date in the driver's Viewport
+ * and DepthRange functions.
+ */
+ _math_matrix_viewport(&ctx->Viewport._WindowMap,
+ ctx->Viewport.X, ctx->Viewport.Y,
+ ctx->Viewport.Width, ctx->Viewport.Height,
+ ctx->Viewport.Near, ctx->Viewport.Far,
+ ctx->DrawBuffer->_DepthMaxF);
+#endif
+
+ if (ctx->Driver.DepthRange) {
+ (*ctx->Driver.DepthRange)( ctx, nearval, farval );
+ }
+}
+#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 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 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 < MAX_TEXTURE_UNITS; i++)
+ init_matrix_stack(&ctx->TextureMatrixStack[i], MAX_TEXTURE_STACK_DEPTH,
+ _NEW_TEXTURE_MATRIX);
+ for (i = 0; i < MAX_PROGRAM_MATRICES; 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 < MAX_TEXTURE_UNITS; i++)
+ free_matrix_stack(&ctx->TextureMatrixStack[i]);
+ for (i = 0; i < MAX_PROGRAM_MATRICES; 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 );
+}
+
+
+/**
+ * Initialize the context viewport attribute group.
+ *
+ * \param ctx GL context.
+ *
+ * \todo Move this to a new file with other 'viewport' routines.
+ */
+void _mesa_init_viewport( GLcontext *ctx )
+{
+ GLfloat depthMax = 65535.0F; /* sorf of arbitrary */
+
+ /* Viewport group */
+ ctx->Viewport.X = 0;
+ ctx->Viewport.Y = 0;
+ ctx->Viewport.Width = 0;
+ ctx->Viewport.Height = 0;
+ ctx->Viewport.Near = 0.0;
+ ctx->Viewport.Far = 1.0;
+ _math_matrix_ctr(&ctx->Viewport._WindowMap);
+
+ _math_matrix_viewport(&ctx->Viewport._WindowMap, 0, 0, 0, 0,
+ 0.0F, 1.0F, depthMax);
+}
+
+
+/**
+ * Free the context viewport attribute group data.
+ *
+ * \param ctx GL context.
+ *
+ * \todo Move this to a new file with other 'viewport' routines.
+ */
+void _mesa_free_viewport_data( GLcontext *ctx )
+{
+ _math_matrix_dtr(&ctx->Viewport._WindowMap);
+}
+
+/*@}*/