svn merge ^/branches/released . --username marha

1 files changed, 718 insertions, 0 deletions

diff --git a/mesalib/src/mesa/main/state.c b/mesalib/src/mesa/main/state.c
new file mode 100644
index 000000000..140a998df
--- /dev/null
+++ b/mesalib/src/mesa/main/state.c
@@ -0,0 +1,718 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.3
+ *
+ * Copyright (C) 1999-2008  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 state.c
+ * State management.
+ * 
+ * This file manages recalculation of derived values in GLcontext.
+ */
+
+
+#include "glheader.h"
+#include "mtypes.h"
+#include "context.h"
+#include "debug.h"
+#include "macros.h"
+#include "ffvertex_prog.h"
+#include "framebuffer.h"
+#include "light.h"
+#include "matrix.h"
+#if FEATURE_pixel_transfer
+#include "pixel.h"
+#endif
+#include "shader/program.h"
+#include "shader/prog_parameter.h"
+#include "state.h"
+#include "stencil.h"
+#include "texenvprogram.h"
+#include "texobj.h"
+#include "texstate.h"
+#include "viewport.h"
+
+
+static void
+update_separate_specular(GLcontext *ctx)
+{
+   if (NEED_SECONDARY_COLOR(ctx))
+      ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
+   else
+      ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
+}
+
+
+/**
+ * Compute the index of the last array element that can be safely accessed
+ * in a vertex array.  We can really only do this when the array lives in
+ * a VBO.
+ * The array->_MaxElement field will be updated.
+ * Later in glDrawArrays/Elements/etc we can do some bounds checking.
+ */
+static void
+compute_max_element(struct gl_client_array *array)
+{
+   assert(array->Enabled);
+   if (array->BufferObj->Name) {
+      GLsizeiptrARB offset = (GLsizeiptrARB) array->Ptr;
+      GLsizeiptrARB obj_size = (GLsizeiptrARB) array->BufferObj->Size;
+
+      if (offset < obj_size) {
+	 array->_MaxElement = (obj_size - offset +
+			       array->StrideB -
+			       array->_ElementSize) / array->StrideB;
+      } else {
+	 array->_MaxElement = 0;
+      }
+      /* Compute the max element we can access in the VBO without going
+       * out of bounds.
+       */
+      array->_MaxElement = ((GLsizeiptrARB) array->BufferObj->Size
+                            - (GLsizeiptrARB) array->Ptr + array->StrideB
+                            - array->_ElementSize) / array->StrideB;
+   }
+   else {
+      /* user-space array, no idea how big it is */
+      array->_MaxElement = 2 * 1000 * 1000 * 1000; /* just a big number */
+   }
+}
+
+
+/**
+ * Helper for update_arrays().
+ * \return  min(current min, array->_MaxElement).
+ */
+static GLuint
+update_min(GLuint min, struct gl_client_array *array)
+{
+   compute_max_element(array);
+   return MIN2(min, array->_MaxElement);
+}
+
+
+/**
+ * Update ctx->Array._MaxElement (the max legal index into all enabled arrays).
+ * Need to do this upon new array state or new buffer object state.
+ */
+static void
+update_arrays( GLcontext *ctx )
+{
+   struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
+   GLuint i, min = ~0;
+
+   /* find min of _MaxElement values for all enabled arrays */
+
+   /* 0 */
+   if (ctx->VertexProgram._Current
+       && arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
+      min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_POS]);
+   }
+   else if (arrayObj->Vertex.Enabled) {
+      min = update_min(min, &arrayObj->Vertex);
+   }
+
+   /* 1 */
+   if (ctx->VertexProgram._Enabled
+       && arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
+      min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]);
+   }
+   /* no conventional vertex weight array */
+
+   /* 2 */
+   if (ctx->VertexProgram._Enabled
+       && arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
+      min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]);
+   }
+   else if (arrayObj->Normal.Enabled) {
+      min = update_min(min, &arrayObj->Normal);
+   }
+
+   /* 3 */
+   if (ctx->VertexProgram._Enabled
+       && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
+      min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]);
+   }
+   else if (arrayObj->Color.Enabled) {
+      min = update_min(min, &arrayObj->Color);
+   }
+
+   /* 4 */
+   if (ctx->VertexProgram._Enabled
+       && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
+      min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]);
+   }
+   else if (arrayObj->SecondaryColor.Enabled) {
+      min = update_min(min, &arrayObj->SecondaryColor);
+   }
+
+   /* 5 */
+   if (ctx->VertexProgram._Enabled
+       && arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
+      min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_FOG]);
+   }
+   else if (arrayObj->FogCoord.Enabled) {
+      min = update_min(min, &arrayObj->FogCoord);
+   }
+
+   /* 6 */
+   if (ctx->VertexProgram._Enabled
+       && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
+      min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]);
+   }
+   else if (arrayObj->Index.Enabled) {
+      min = update_min(min, &arrayObj->Index);
+   }
+
+   /* 7 */
+   if (ctx->VertexProgram._Enabled
+       && arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
+      min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]);
+   }
+
+   /* 8..15 */
+   for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
+      if (ctx->VertexProgram._Enabled
+          && arrayObj->VertexAttrib[i].Enabled) {
+         min = update_min(min, &arrayObj->VertexAttrib[i]);
+      }
+      else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
+               && arrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
+         min = update_min(min, &arrayObj->TexCoord[i - VERT_ATTRIB_TEX0]);
+      }
+   }
+
+   /* 16..31 */
+   if (ctx->VertexProgram._Current) {
+      for (i = 0; i < Elements(arrayObj->VertexAttrib); i++) {
+         if (arrayObj->VertexAttrib[i].Enabled) {
+            min = update_min(min, &arrayObj->VertexAttrib[i]);
+         }
+      }
+   }
+
+   if (arrayObj->EdgeFlag.Enabled) {
+      min = update_min(min, &arrayObj->EdgeFlag);
+   }
+
+   /* _MaxElement is one past the last legal array element */
+   arrayObj->_MaxElement = min;
+}
+
+
+/**
+ * Update the following fields:
+ *   ctx->VertexProgram._Enabled
+ *   ctx->FragmentProgram._Enabled
+ *   ctx->ATIFragmentShader._Enabled
+ * This needs to be done before texture state validation.
+ */
+static void
+update_program_enables(GLcontext *ctx)
+{
+   /* These _Enabled flags indicate if the program is enabled AND valid. */
+   ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
+      && ctx->VertexProgram.Current->Base.Instructions;
+   ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
+      && ctx->FragmentProgram.Current->Base.Instructions;
+   ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
+      && ctx->ATIFragmentShader.Current->Instructions[0];
+}
+
+
+/**
+ * Update vertex/fragment program state.  In particular, update these fields:
+ *   ctx->VertexProgram._Current
+ *   ctx->VertexProgram._TnlProgram,
+ * These point to the highest priority enabled vertex/fragment program or are
+ * NULL if fixed-function processing is to be done.
+ *
+ * This function needs to be called after texture state validation in case
+ * we're generating a fragment program from fixed-function texture state.
+ *
+ * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
+ * or fragment program is being used.
+ */
+static GLbitfield
+update_program(GLcontext *ctx)
+{
+   const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
+   const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
+   const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
+   GLbitfield new_state = 0x0;
+
+   /*
+    * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
+    * pointers to the programs that should be used for rendering.  If either
+    * is NULL, use fixed-function code paths.
+    *
+    * These programs may come from several sources.  The priority is as
+    * follows:
+    *   1. OpenGL 2.0/ARB vertex/fragment shaders
+    *   2. ARB/NV vertex/fragment programs
+    *   3. Programs derived from fixed-function state.
+    *
+    * Note: it's possible for a vertex shader to get used with a fragment
+    * program (and vice versa) here, but in practice that shouldn't ever
+    * come up, or matter.
+    */
+
+   if (shProg && shProg->LinkStatus && shProg->FragmentProgram) {
+      /* Use shader programs */
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
+                               shProg->FragmentProgram);
+   }
+   else if (ctx->FragmentProgram._Enabled) {
+      /* use user-defined vertex program */
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
+                               ctx->FragmentProgram.Current);
+   }
+   else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
+      /* Use fragment program generated from fixed-function state.
+       */
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
+                               _mesa_get_fixed_func_fragment_program(ctx));
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
+                               ctx->FragmentProgram._Current);
+   }
+   else {
+      /* no fragment program */
+      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
+   }
+
+   /* Examine vertex program after fragment program as
+    * _mesa_get_fixed_func_vertex_program() needs to know active
+    * fragprog inputs.
+    */
+   if (shProg && shProg->LinkStatus && shProg->VertexProgram) {
+      /* Use shader programs */
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
+                            shProg->VertexProgram);
+   }
+   else if (ctx->VertexProgram._Enabled) {
+      /* use user-defined vertex program */
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
+                               ctx->VertexProgram.Current);
+   }
+   else if (ctx->VertexProgram._MaintainTnlProgram) {
+      /* Use vertex program generated from fixed-function state.
+       */
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
+                               _mesa_get_fixed_func_vertex_program(ctx));
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
+                               ctx->VertexProgram._Current);
+   }
+   else {
+      /* no vertex program */
+      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
+   }
+
+   /* Let the driver know what's happening:
+    */
+   if (ctx->FragmentProgram._Current != prevFP) {
+      new_state |= _NEW_PROGRAM;
+      if (ctx->Driver.BindProgram) {
+         ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
+                          (struct gl_program *) ctx->FragmentProgram._Current);
+      }
+   }
+   
+   if (ctx->VertexProgram._Current != prevVP) {
+      new_state |= _NEW_PROGRAM;
+      if (ctx->Driver.BindProgram) {
+         ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
+                            (struct gl_program *) ctx->VertexProgram._Current);
+      }
+   }
+
+   return new_state;
+}
+
+
+/**
+ * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
+ */
+static GLbitfield
+update_program_constants(GLcontext *ctx)
+{
+   GLbitfield new_state = 0x0;
+
+   if (ctx->FragmentProgram._Current) {
+      const struct gl_program_parameter_list *params =
+         ctx->FragmentProgram._Current->Base.Parameters;
+      if (params && params->StateFlags & ctx->NewState) {
+         new_state |= _NEW_PROGRAM_CONSTANTS;
+      }
+   }
+
+   if (ctx->VertexProgram._Current) {
+      const struct gl_program_parameter_list *params =
+         ctx->VertexProgram._Current->Base.Parameters;
+      if (params && params->StateFlags & ctx->NewState) {
+         new_state |= _NEW_PROGRAM_CONSTANTS;
+      }
+   }
+
+   return new_state;
+}
+
+
+
+
+static void
+update_viewport_matrix(GLcontext *ctx)
+{
+   const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
+
+   ASSERT(depthMax > 0);
+
+   /* Compute scale and bias values. This is really driver-specific
+    * and should be maintained elsewhere if at all.
+    * NOTE: RasterPos uses this.
+    */
+   _math_matrix_viewport(&ctx->Viewport._WindowMap,
+                         ctx->Viewport.X, ctx->Viewport.Y,
+                         ctx->Viewport.Width, ctx->Viewport.Height,
+                         ctx->Viewport.Near, ctx->Viewport.Far,
+                         depthMax);
+}
+
+
+/**
+ * Update derived multisample state.
+ */
+static void
+update_multisample(GLcontext *ctx)
+{
+   ctx->Multisample._Enabled = GL_FALSE;
+   if (ctx->Multisample.Enabled &&
+       ctx->DrawBuffer &&
+       ctx->DrawBuffer->Visual.sampleBuffers)
+      ctx->Multisample._Enabled = GL_TRUE;
+}
+
+
+/**
+ * Update derived color/blend/logicop state.
+ */
+static void
+update_color(GLcontext *ctx)
+{
+   /* This is needed to support 1.1's RGB logic ops AND
+    * 1.0's blending logicops.
+    */
+   ctx->Color._LogicOpEnabled = RGBA_LOGICOP_ENABLED(ctx);
+}
+
+
+/*
+ * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
+ * in ctx->_TriangleCaps if needed.
+ */
+static void
+update_polygon(GLcontext *ctx)
+{
+   ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
+
+   if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
+      ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
+
+   if (   ctx->Polygon.OffsetPoint
+       || ctx->Polygon.OffsetLine
+       || ctx->Polygon.OffsetFill)
+      ctx->_TriangleCaps |= DD_TRI_OFFSET;
+}
+
+
+/**
+ * Update the ctx->_TriangleCaps bitfield.
+ * XXX that bitfield should really go away someday!
+ * This function must be called after other update_*() functions since
+ * there are dependencies on some other derived values.
+ */
+#if 0
+static void
+update_tricaps(GLcontext *ctx, GLbitfield new_state)
+{
+   ctx->_TriangleCaps = 0;
+
+   /*
+    * Points
+    */
+   if (1/*new_state & _NEW_POINT*/) {
+      if (ctx->Point.SmoothFlag)
+         ctx->_TriangleCaps |= DD_POINT_SMOOTH;
+      if (ctx->Point.Size != 1.0F)
+         ctx->_TriangleCaps |= DD_POINT_SIZE;
+      if (ctx->Point._Attenuated)
+         ctx->_TriangleCaps |= DD_POINT_ATTEN;
+   }
+
+   /*
+    * Lines
+    */
+   if (1/*new_state & _NEW_LINE*/) {
+      if (ctx->Line.SmoothFlag)
+         ctx->_TriangleCaps |= DD_LINE_SMOOTH;
+      if (ctx->Line.StippleFlag)
+         ctx->_TriangleCaps |= DD_LINE_STIPPLE;
+      if (ctx->Line.Width != 1.0)
+         ctx->_TriangleCaps |= DD_LINE_WIDTH;
+   }
+
+   /*
+    * Polygons
+    */
+   if (1/*new_state & _NEW_POLYGON*/) {
+      if (ctx->Polygon.SmoothFlag)
+         ctx->_TriangleCaps |= DD_TRI_SMOOTH;
+      if (ctx->Polygon.StippleFlag)
+         ctx->_TriangleCaps |= DD_TRI_STIPPLE;
+      if (ctx->Polygon.FrontMode != GL_FILL
+          || ctx->Polygon.BackMode != GL_FILL)
+         ctx->_TriangleCaps |= DD_TRI_UNFILLED;
+      if (ctx->Polygon.CullFlag
+          && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
+         ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
+      if (ctx->Polygon.OffsetPoint ||
+          ctx->Polygon.OffsetLine ||
+          ctx->Polygon.OffsetFill)
+         ctx->_TriangleCaps |= DD_TRI_OFFSET;
+   }
+
+   /*
+    * Lighting and shading
+    */
+   if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
+      ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
+   if (ctx->Light.ShadeModel == GL_FLAT)
+      ctx->_TriangleCaps |= DD_FLATSHADE;
+   if (NEED_SECONDARY_COLOR(ctx))
+      ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
+
+   /*
+    * Stencil
+    */
+   if (ctx->Stencil._TestTwoSide)
+      ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
+}
+#endif
+
+
+/**
+ * Compute derived GL state.
+ * If __GLcontextRec::NewState is non-zero then this function \b must
+ * be called before rendering anything.
+ *
+ * Calls dd_function_table::UpdateState to perform any internal state
+ * management necessary.
+ * 
+ * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
+ * _mesa_update_buffer_bounds(),
+ * _mesa_update_lighting() and _mesa_update_tnl_spaces().
+ */
+void
+_mesa_update_state_locked( GLcontext *ctx )
+{
+   GLbitfield new_state = ctx->NewState;
+   GLbitfield prog_flags = _NEW_PROGRAM;
+   GLbitfield new_prog_state = 0x0;
+
+   if (new_state == _NEW_CURRENT_ATTRIB) 
+      goto out;
+
+   if (MESA_VERBOSE & VERBOSE_STATE)
+      _mesa_print_state("_mesa_update_state", new_state);
+
+   /* Determine which state flags effect vertex/fragment program state */
+   if (ctx->FragmentProgram._MaintainTexEnvProgram) {
+      prog_flags |= (_NEW_TEXTURE | _NEW_FOG |
+		     _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
+		     _NEW_PROGRAM);
+   }
+   if (ctx->VertexProgram._MaintainTnlProgram) {
+      prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
+                     _NEW_TRANSFORM | _NEW_POINT |
+                     _NEW_FOG | _NEW_LIGHT |
+                     _MESA_NEW_NEED_EYE_COORDS);
+   }
+
+   /*
+    * Now update derived state info
+    */
+
+   if (new_state & prog_flags)
+      update_program_enables( ctx );
+
+   if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
+      _mesa_update_modelview_project( ctx, new_state );
+
+   if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
+      _mesa_update_texture( ctx, new_state );
+
+   if (new_state & _NEW_BUFFERS)
+      _mesa_update_framebuffer(ctx);
+
+   if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
+      _mesa_update_draw_buffer_bounds( ctx );
+
+   if (new_state & _NEW_POLYGON)
+      update_polygon( ctx );
+
+   if (new_state & _NEW_LIGHT)
+      _mesa_update_lighting( ctx );
+
+   if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
+      _mesa_update_stencil( ctx );
+
+#if FEATURE_pixel_transfer
+   if (new_state & _MESA_NEW_TRANSFER_STATE)
+      _mesa_update_pixel( ctx, new_state );
+#endif
+
+   if (new_state & _DD_NEW_SEPARATE_SPECULAR)
+      update_separate_specular( ctx );
+
+   if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
+      update_arrays( ctx );
+
+   if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
+      update_viewport_matrix(ctx);
+
+   if (new_state & _NEW_MULTISAMPLE)
+      update_multisample( ctx );
+
+   if (new_state & _NEW_COLOR)
+      update_color( ctx );
+
+#if 0
+   if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
+                    | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
+      update_tricaps( ctx, new_state );
+#endif
+
+   /* ctx->_NeedEyeCoords is now up to date.
+    *
+    * If the truth value of this variable has changed, update for the
+    * new lighting space and recompute the positions of lights and the
+    * normal transform.
+    *
+    * If the lighting space hasn't changed, may still need to recompute
+    * light positions & normal transforms for other reasons.
+    */
+   if (new_state & _MESA_NEW_NEED_EYE_COORDS) 
+      _mesa_update_tnl_spaces( ctx, new_state );
+
+   if (new_state & prog_flags) {
+      /* When we generate programs from fixed-function vertex/fragment state
+       * this call may generate/bind a new program.  If so, we need to
+       * propogate the _NEW_PROGRAM flag to the driver.
+       */
+      new_prog_state |= update_program( ctx );
+   }
+
+
+ out:
+   new_prog_state |= update_program_constants(ctx);
+
+   /*
+    * Give the driver a chance to act upon the new_state flags.
+    * The driver might plug in different span functions, for example.
+    * Also, this is where the driver can invalidate the state of any
+    * active modules (such as swrast_setup, swrast, tnl, etc).
+    *
+    * Set ctx->NewState to zero to avoid recursion if
+    * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
+    */
+   new_state = ctx->NewState | new_prog_state;
+   ctx->NewState = 0;
+   ctx->Driver.UpdateState(ctx, new_state);
+   ctx->Array.NewState = 0;
+}
+
+
+/* This is the usual entrypoint for state updates:
+ */
+void
+_mesa_update_state( GLcontext *ctx )
+{
+   _mesa_lock_context_textures(ctx);
+   _mesa_update_state_locked(ctx);
+   _mesa_unlock_context_textures(ctx);
+}
+
+
+
+
+/**
+ * Want to figure out which fragment program inputs are actually
+ * constant/current values from ctx->Current.  These should be
+ * referenced as a tracked state variable rather than a fragment
+ * program input, to save the overhead of putting a constant value in
+ * every submitted vertex, transferring it to hardware, interpolating
+ * it across the triangle, etc...
+ *
+ * When there is a VP bound, just use vp->outputs.  But when we're
+ * generating vp from fixed function state, basically want to
+ * calculate:
+ *
+ * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) | 
+ *                 potential_vp_outputs )
+ *
+ * Where potential_vp_outputs is calculated by looking at enabled
+ * texgen, etc.
+ * 
+ * The generated fragment program should then only declare inputs that
+ * may vary or otherwise differ from the ctx->Current values.
+ * Otherwise, the fp should track them as state values instead.
+ */
+void
+_mesa_set_varying_vp_inputs( GLcontext *ctx,
+                             GLbitfield varying_inputs )
+{
+   if (ctx->varying_vp_inputs != varying_inputs) {
+      ctx->varying_vp_inputs = varying_inputs;
+      ctx->NewState |= _NEW_ARRAY;
+      /*_mesa_printf("%s %x\n", __FUNCTION__, varying_inputs);*/
+   }
+}
+
+
+/**
+ * Used by drivers to tell core Mesa that the driver is going to
+ * install/ use its own vertex program.  In particular, this will
+ * prevent generated fragment programs from using state vars instead
+ * of ordinary varyings/inputs.
+ */
+void
+_mesa_set_vp_override(GLcontext *ctx, GLboolean flag)
+{
+   if (ctx->VertexProgram._Overriden != flag) {
+      ctx->VertexProgram._Overriden = flag;
+
+      /* Set one of the bits which will trigger fragment program
+       * regeneration:
+       */
+      ctx->NewState |= _NEW_PROGRAM;
+   }
+}