X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmesa%2Fmain%2Fmatrix.c;h=00b8e00b75ef8c84ffc13758d3e116129b8d2eb0;hb=1a1db1746db82efc7f0643508886dfc78a15eb71;hp=af046a3c8f076cfe6df540ae73427c07112c6eaa;hpb=27558a160a9fe91745728d7626995cd88f8fe339;p=mesa.git

diff --git a/src/mesa/main/matrix.c b/src/mesa/main/matrix.c
index af046a3c8f0..00b8e00b75e 100644
--- a/src/mesa/main/matrix.c
+++ b/src/mesa/main/matrix.c
@@ -1,10 +1,9 @@
-/* $Id: matrix.c,v 1.46 2003/03/01 01:50:21 brianp Exp $ */
-
 /*
  * Mesa 3-D graphics library
- * Version:  5.1
+ * Version:  7.5
  *
- * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
+ * 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"),
@@ -25,29 +24,45 @@
  */
 
 
-/*
- * Matrix operations
+/**
+ * \file matrix.c
+ * Matrix operations.
  *
- * NOTES:
- * 1. 4x4 transformation matrices are stored in memory in column major order.
- * 2. Points/vertices are to be thought of as column vectors.
- * 3. Transformation of a point p by a matrix M is: p' = M * p
+ * \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 "buffers.h"
 #include "context.h"
 #include "enums.h"
 #include "macros.h"
+#include "mfeatures.h"
 #include "matrix.h"
 #include "mtypes.h"
 #include "math/m_matrix.h"
 
 
-
-void
+/**
+ * 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 )
@@ -73,7 +88,23 @@ _mesa_Frustum( GLdouble left, GLdouble right,
 }
 
 
-void
+/**
+ * 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 )
@@ -82,7 +113,7 @@ _mesa_Ortho( GLdouble left, GLdouble right,
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 
    if (MESA_VERBOSE & VERBOSE_API)
-      _mesa_debug(ctx, "glFrustum(%f, %f, %f, %f, %f, %f)\n",
+      _mesa_debug(ctx, "glOrtho(%f, %f, %f, %f, %f, %f)\n",
                   left, right, bottom, top, nearval, farval);
 
    if (left == right ||
@@ -101,7 +132,18 @@ _mesa_Ortho( GLdouble left, GLdouble right,
 }
 
 
-void
+/**
+ * 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);
@@ -119,27 +161,50 @@ _mesa_MatrixMode( GLenum mode )
       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) {
-         _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode" );
+   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->API == API_OPENGL
+          && (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;
       }
-      ctx->CurrentStack = &ctx->ProgramMatrixStack[mode - GL_MATRIX0_NV];
       break;
    default:
-      _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode" );
+      _mesa_error( ctx,  GL_INVALID_ENUM, "glMatrixMode(mode)" );
       return;
    }
 
@@ -147,12 +212,20 @@ _mesa_MatrixMode( GLenum mode )
 }
 
 
-
-void
+/**
+ * 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 matrix_stack *stack = ctx->CurrentStack;
+   struct gl_matrix_stack *stack = ctx->CurrentStack;
    ASSERT_OUTSIDE_BEGIN_END(ctx);
 
    if (MESA_VERBOSE&VERBOSE_API)
@@ -160,7 +233,15 @@ _mesa_PushMatrix( void )
                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 
    if (stack->Depth + 1 >= stack->MaxDepth) {
-      _mesa_error( ctx,  GL_STACK_OVERFLOW, "glPushMatrix" );
+      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],
@@ -171,12 +252,20 @@ _mesa_PushMatrix( void )
 }
 
 
-
-void
+/**
+ * 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 matrix_stack *stack = ctx->CurrentStack;
+   struct gl_matrix_stack *stack = ctx->CurrentStack;
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 
    if (MESA_VERBOSE&VERBOSE_API)
@@ -184,7 +273,15 @@ _mesa_PopMatrix( void )
                   _mesa_lookup_enum_by_nr(ctx->Transform.MatrixMode));
 
    if (stack->Depth == 0) {
-      _mesa_error( ctx,  GL_STACK_UNDERFLOW, "glPopMatrix" );
+      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--;
@@ -193,22 +290,41 @@ _mesa_PopMatrix( void )
 }
 
 
-
-void
+/**
+ * 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()");
+      _mesa_debug(ctx, "glLoadIdentity()\n");
 
    _math_matrix_set_identity( ctx->CurrentStack->Top );
    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 }
 
 
-void
+/**
+ * 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);
@@ -227,23 +343,18 @@ _mesa_LoadMatrixf( const GLfloat *m )
 }
 
 
-void
-_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);
-}
-
-
-
-/*
- * Multiply the active matrix by an arbitary matrix.
+/**
+ * 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
+void GLAPIENTRY
 _mesa_MultMatrixf( const GLfloat *m )
 {
    GET_CURRENT_CONTEXT(ctx);
@@ -261,27 +372,21 @@ _mesa_MultMatrixf( const GLfloat *m )
 }
 
 
-/*
- * Multiply the active matrix by an arbitary matrix.
- */
-void
-_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 );
-}
-
-
-
-
-/*
- * Execute a glRotate call
+/**
+ * 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
+void GLAPIENTRY
 _mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
 {
    GET_CURRENT_CONTEXT(ctx);
@@ -292,17 +397,21 @@ _mesa_Rotatef( GLfloat angle, GLfloat x, GLfloat y, GLfloat z )
    }
 }
 
-void
-_mesa_Rotated( GLdouble angle, GLdouble x, GLdouble y, GLdouble z )
-{
-   _mesa_Rotatef((GLfloat) angle, (GLfloat) x, (GLfloat) y, (GLfloat) z);
-}
-
 
-/*
- * Execute a glScale call
+/**
+ * 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
+void GLAPIENTRY
 _mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
 {
    GET_CURRENT_CONTEXT(ctx);
@@ -312,17 +421,20 @@ _mesa_Scalef( GLfloat x, GLfloat y, GLfloat z )
 }
 
 
-void
-_mesa_Scaled( GLdouble x, GLdouble y, GLdouble z )
-{
-   _mesa_Scalef((GLfloat) x, (GLfloat) y, (GLfloat) z);
-}
-
-
-/*
- * Execute a glTranslate call
+/**
+ * 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
+void GLAPIENTRY
 _mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
 {
    GET_CURRENT_CONTEXT(ctx);
@@ -331,16 +443,53 @@ _mesa_Translatef( GLfloat x, GLfloat y, GLfloat z )
    ctx->NewState |= ctx->CurrentStack->DirtyFlag;
 }
 
+ 
+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
+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);
 }
 
 
-void
-_mesa_LoadTransposeMatrixfARB( const GLfloat *m )
+void GLAPIENTRY
+_mesa_LoadTransposeMatrixf( const GLfloat *m )
 {
    GLfloat tm[16];
    if (!m) return;
@@ -349,8 +498,8 @@ _mesa_LoadTransposeMatrixfARB( const GLfloat *m )
 }
 
 
-void
-_mesa_LoadTransposeMatrixdARB( const GLdouble *m )
+void GLAPIENTRY
+_mesa_LoadTransposeMatrixd( const GLdouble *m )
 {
    GLfloat tm[16];
    if (!m) return;
@@ -359,8 +508,8 @@ _mesa_LoadTransposeMatrixdARB( const GLdouble *m )
 }
 
 
-void
-_mesa_MultTransposeMatrixfARB( const GLfloat *m )
+void GLAPIENTRY
+_mesa_MultTransposeMatrixf( const GLfloat *m )
 {
    GLfloat tm[16];
    if (!m) return;
@@ -369,8 +518,8 @@ _mesa_MultTransposeMatrixfARB( const GLfloat *m )
 }
 
 
-void
-_mesa_MultTransposeMatrixdARB( const GLdouble *m )
+void GLAPIENTRY
+_mesa_MultTransposeMatrixd( const GLdouble *m )
 {
    GLfloat tm[16];
    if (!m) return;
@@ -379,104 +528,239 @@ _mesa_MultTransposeMatrixdARB( const GLdouble *m )
 }
 
 
-/*
- * Called via glViewport or display list execution.
+
+/**********************************************************************/
+/** \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.
  */
-void
-_mesa_Viewport( GLint x, GLint y, GLsizei width, GLsizei height )
+static void
+update_projection( struct gl_context *ctx )
 {
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
-   _mesa_set_viewport(ctx, x, y, width, height);
+   _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
+
+   /* 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 );
+	 }
+      }
+   }
 }
 
 
-/*
- * Define a new viewport and reallocate auxillary buffers if the size of
- * the window (color buffer) has changed.
+/**
+ * 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().
  */
-void
-_mesa_set_viewport( GLcontext *ctx, GLint x, GLint y,
-                    GLsizei width, GLsizei height )
+static void
+calculate_model_project_matrix( struct gl_context *ctx )
 {
-   const GLfloat n = ctx->Viewport.Near;
-   const GLfloat f = ctx->Viewport.Far;
+   _math_matrix_mul_matrix( &ctx->_ModelProjectMatrix,
+                            ctx->ProjectionMatrixStack.Top,
+                            ctx->ModelviewMatrixStack.Top );
 
-   if (MESA_VERBOSE & VERBOSE_API)
-      _mesa_debug(ctx, "glViewport %d %d %d %d\n", x, y, width, height);
+   _math_matrix_analyse( &ctx->_ModelProjectMatrix );
+}
 
-   if (width < 0 || height < 0) {
-      _mesa_error( ctx,  GL_INVALID_VALUE,
-                   "glViewport(%d, %d, %d, %d)", x, y, width, height );
-      return;
+
+/**
+ * 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 up to date.
+       */
+      TRANSFORM_POINT3( ctx->Transform.CullObjPos, 
+			ctx->ModelviewMatrixStack.Top->inv,
+			ctx->Transform.CullEyePos );
    }
 
-   /* clamp width, and height to implementation dependent range */
-   width  = CLAMP( width,  1, MAX_WIDTH );
-   height = CLAMP( height, 1, MAX_HEIGHT );
 
-   /* Save viewport */
-   ctx->Viewport.X = x;
-   ctx->Viewport.Width = width;
-   ctx->Viewport.Y = y;
-   ctx->Viewport.Height = height;
+   if (new_state & _NEW_PROJECTION)
+      update_projection( ctx );
 
-   /* compute scale and bias values :: This is really driver-specific
-    * and should be maintained elsewhere if at all.
+   /* Keep ModelviewProject up to date always to allow tnl
+    * implementations that go model->clip even when eye is required.
     */
-   ctx->Viewport._WindowMap.m[MAT_SX] = (GLfloat) width / 2.0F;
-   ctx->Viewport._WindowMap.m[MAT_TX] = ctx->Viewport._WindowMap.m[MAT_SX] + x;
-   ctx->Viewport._WindowMap.m[MAT_SY] = (GLfloat) height / 2.0F;
-   ctx->Viewport._WindowMap.m[MAT_TY] = ctx->Viewport._WindowMap.m[MAT_SY] + y;
-   ctx->Viewport._WindowMap.m[MAT_SZ] = ctx->DepthMaxF * ((f - n) / 2.0F);
-   ctx->Viewport._WindowMap.m[MAT_TZ] = ctx->DepthMaxF * ((f - n) / 2.0F + n);
-   ctx->Viewport._WindowMap.flags = MAT_FLAG_GENERAL_SCALE|MAT_FLAG_TRANSLATION;
-   ctx->Viewport._WindowMap.type = MATRIX_3D_NO_ROT;
-   ctx->NewState |= _NEW_VIEWPORT;
-
-   /* Check if window/buffer has been resized and if so, reallocate the
-    * ancillary buffers.
-    */
-   _mesa_ResizeBuffersMESA();
+   calculate_model_project_matrix(ctx);
+}
+
+/*@}*/
+
+
+/**********************************************************************/
+/** Matrix stack initialization */
+/*@{*/
+
 
-   if (ctx->Driver.Viewport) {
-      (*ctx->Driver.Viewport)( ctx, x, y, width, height );
+/**
+ * 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() 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 = calloc(maxDepth, sizeof(GLmatrix));
+   for (i = 0; i < maxDepth; i++) {
+      _math_matrix_ctr(&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 );
+}
 
 
-void
-_mesa_DepthRange( GLclampd nearval, GLclampd farval )
+/**
+ * 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 )
 {
-   /*
-    * nearval - specifies mapping of the near clipping plane to window
-    *   coordinates, default is 0
-    * farval - specifies mapping of the far clipping plane to window
-    *   coordinates, default is 1
-    *
-    * After clipping and div by w, z coords are in -1.0 to 1.0,
-    * corresponding to near and far clipping planes.  glDepthRange
-    * specifies a linear mapping of the normalized z coords in
-    * this range to window z coords.
-    */
-   GLfloat n, f;
-   GET_CURRENT_CONTEXT(ctx);
-   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
+   GLint i;
 
-   if (MESA_VERBOSE&VERBOSE_API)
-      _mesa_debug(ctx, "glDepthRange %f %f\n", nearval, farval);
+   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 );
 
-   n = (GLfloat) CLAMP( nearval, 0.0, 1.0 );
-   f = (GLfloat) CLAMP( farval, 0.0, 1.0 );
+}
 
-   ctx->Viewport.Near = n;
-   ctx->Viewport.Far = f;
-   ctx->Viewport._WindowMap.m[MAT_SZ] = ctx->DepthMaxF * ((f - n) / 2.0F);
-   ctx->Viewport._WindowMap.m[MAT_TZ] = ctx->DepthMaxF * ((f - n) / 2.0F + n);
-   ctx->NewState |= _NEW_VIEWPORT;
 
-   if (ctx->Driver.DepthRange) {
-      (*ctx->Driver.DepthRange)( ctx, nearval, farval );
+/** 
+ * 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 )
+{
+   GLuint 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<ctx->Const.MaxClipPlanes;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 );
 }
+
+
+/*@}*/