icd/intel/compiler/mesa-utils/src/mesa/main/uniforms.c

/*
 * Mesa 3-D graphics library
 *
 * Copyright (C) 2004-2008  Brian Paul   All Rights Reserved.
 * Copyright (C) 2009-2010  VMware, Inc.  All Rights Reserved.
 * Copyright © 2010 Intel Corporation
 *
 * 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
 * THE AUTHORS OR COPYRIGHT HOLDERS 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 uniforms.c
 * Functions related to GLSL uniform variables.
 * \author Brian Paul
 */

/**
 * XXX things to do:
 * 1. Check that the right error code is generated for all _mesa_error() calls.
 * 2. Insert FLUSH_VERTICES calls in various places
 */

#include "main/glheader.h"
#include "main/context.h"
#include "main/shaderobj.h"
#include "main/uniforms.h"
#include "main/enums.h"
#include "ir_uniform.h"
#include "glsl_types.h"
#include "program/program.h"

/**
 * Update the vertex/fragment program's TexturesUsed array.
 *
 * This needs to be called after glUniform(set sampler var) is called.
 * A call to glUniform(samplerVar, value) causes a sampler to point to a
 * particular texture unit.  We know the sampler's texture target
 * (1D/2D/3D/etc) from compile time but the sampler's texture unit is
 * set by glUniform() calls.
 *
 * So, scan the program->SamplerUnits[] and program->SamplerTargets[]
 * information to update the prog->TexturesUsed[] values.
 * Each value of TexturesUsed[unit] is one of zero, TEXTURE_1D_INDEX,
 * TEXTURE_2D_INDEX, TEXTURE_3D_INDEX, etc.
 * We'll use that info for state validation before rendering.
 */
void
_mesa_update_shader_textures_used(struct gl_shader_program *shProg,
				  struct gl_program *prog)
{
   GLuint s;
   struct gl_shader *shader =
      shProg->_LinkedShaders[_mesa_program_enum_to_shader_stage(prog->Target)];

   assert(shader);

   memcpy(prog->SamplerUnits, shader->SamplerUnits, sizeof(prog->SamplerUnits));
   memset(prog->TexturesUsed, 0, sizeof(prog->TexturesUsed));

   for (s = 0; s < MAX_SAMPLERS; s++) {
      if (prog->SamplersUsed & (1 << s)) {
         // LunarG - mask out the set value, which resides in upper 16-bits
         GLuint unit = shader->SamplerUnits[s] & 0xFFFF;
         GLuint tgt = shader->SamplerTargets[s];
         assert(unit < Elements(prog->TexturesUsed));
         assert(tgt < NUM_TEXTURE_TARGETS);
         prog->TexturesUsed[unit] |= (1 << tgt);
      }
   }
}