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/*

 * 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 struct gl_context.

 */

#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"

#include "pixel.h"

#include "program/program.h"

#include "program/prog_parameter.h"

#include "state.h"

#include "stencil.h"

#include "texenvprogram.h"

#include "texobj.h"

#include "texstate.h"

static void

update_separate_specular(struct gl_context *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;

      }

   }

   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( struct gl_context *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(struct gl_context *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(struct gl_context *ctx)

{

   const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;

   const struct gl_shader_program *gsProg = ctx->Shader.CurrentGeometryProgram;

   const struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;

   const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;

   const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;

   const struct gl_geometry_program *prevGP = ctx->GeometryProgram._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 (fsProg && fsProg->LinkStatus && fsProg->FragmentProgram) {

      /* Use shader programs */

      _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,

                               fsProg->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);

   }

   if (gsProg && gsProg->LinkStatus && gsProg->GeometryProgram) {

      /* Use shader programs */

      _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,

                               gsProg->GeometryProgram);

   } else {

      /* no fragment program */

      _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);

   }

   /* Examine vertex program after fragment program as

    * _mesa_get_fixed_func_vertex_program() needs to know active

    * fragprog inputs.

    */

   if (vsProg && vsProg->LinkStatus && vsProg->VertexProgram) {

      /* Use shader programs */

      _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,

                            vsProg->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->GeometryProgram._Current != prevGP) {

      new_state |= _NEW_PROGRAM;

      if (ctx->Driver.BindProgram) {

         ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,

                            (struct gl_program *) ctx->GeometryProgram._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(struct gl_context *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->GeometryProgram._Current) {

      const struct gl_program_parameter_list *params =

         ctx->GeometryProgram._Current->Base.Parameters;

      /*FIXME: StateFlags is always 0 because we have unnamed constant

       *       not state changes */

      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(struct gl_context *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(struct gl_context *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(struct gl_context *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(struct gl_context *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(struct gl_context *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._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;

   }

   /*

    * 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 __struct gl_contextRec::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( struct gl_context *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_BUFFERS | _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 (new_state & _MESA_NEW_TRANSFER_STATE)

      _mesa_update_pixel( ctx, new_state );

   if (new_state & _DD_NEW_SEPARATE_SPECULAR)

      update_separate_specular( 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 );

   }

   if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))

      update_arrays( 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( struct gl_context *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( struct gl_context *ctx,

                             GLbitfield varying_inputs )

{

   if (ctx->varying_vp_inputs != varying_inputs) {

      ctx->varying_vp_inputs = varying_inputs;

      ctx->NewState |= _NEW_ARRAY;

      /*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(struct gl_context *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;

   }

}