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/*

 * 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/dispatch.h"

#include "main/shaderapi.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_target_to_index(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)) {

         GLuint unit = shader->SamplerUnits[s];

         GLuint tgt = shader->SamplerTargets[s];

         assert(unit < Elements(prog->TexturesUsed));

         assert(tgt < NUM_TEXTURE_TARGETS);

         prog->TexturesUsed[unit] |= (1 << tgt);

      }

   }

}

/**

 * Connect a piece of driver storage with a part of a uniform

 *

 * \param uni            The uniform with which the storage will be associated

 * \param element_stride Byte-stride between array elements.

 *                       \sa gl_uniform_driver_storage::element_stride.

 * \param vector_stride  Byte-stride between vectors (in a matrix).

 *                       \sa gl_uniform_driver_storage::vector_stride.

 * \param format         Conversion from native format to driver format

 *                       required by the driver.

 * \param data           Location to dump the data.

 */

void

_mesa_uniform_attach_driver_storage(struct gl_uniform_storage *uni,

				    unsigned element_stride,

				    unsigned vector_stride,

				    enum gl_uniform_driver_format format,

				    void *data)

{

   uni->driver_storage =

      realloc(uni->driver_storage,

	      sizeof(struct gl_uniform_driver_storage)

	      * (uni->num_driver_storage + 1));

   uni->driver_storage[uni->num_driver_storage].element_stride = element_stride;

   uni->driver_storage[uni->num_driver_storage].vector_stride = vector_stride;

   uni->driver_storage[uni->num_driver_storage].format = (uint8_t) format;

   uni->driver_storage[uni->num_driver_storage].data = data;

   uni->num_driver_storage++;

}

/**

 * Sever all connections with all pieces of driver storage for all uniforms

 *

 * \warning

 * This function does \b not release any of the \c data pointers

 * previously passed in to \c _mesa_uniform_attach_driver_stoarge.

 */

void

_mesa_uniform_detach_all_driver_storage(struct gl_uniform_storage *uni)

{

   free(uni->driver_storage);

   uni->driver_storage = NULL;

   uni->num_driver_storage = 0;

}

void GLAPIENTRY

_mesa_Uniform1f(GLint location, GLfloat v0)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, &v0, GL_FLOAT);

}

void GLAPIENTRY

_mesa_Uniform2f(GLint location, GLfloat v0, GLfloat v1)

{

   GET_CURRENT_CONTEXT(ctx);

   GLfloat v[2];

   v[0] = v0;

   v[1] = v1;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_FLOAT_VEC2);

}

void GLAPIENTRY

_mesa_Uniform3f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2)

{

   GET_CURRENT_CONTEXT(ctx);

   GLfloat v[3];

   v[0] = v0;

   v[1] = v1;

   v[2] = v2;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_FLOAT_VEC3);

}

void GLAPIENTRY

_mesa_Uniform4f(GLint location, GLfloat v0, GLfloat v1, GLfloat v2,

                   GLfloat v3)

{

   GET_CURRENT_CONTEXT(ctx);

   GLfloat v[4];

   v[0] = v0;

   v[1] = v1;

   v[2] = v2;

   v[3] = v3;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_FLOAT_VEC4);

}

void GLAPIENTRY

_mesa_Uniform1i(GLint location, GLint v0)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, &v0, GL_INT);

}

void GLAPIENTRY

_mesa_Uniform2i(GLint location, GLint v0, GLint v1)

{

   GET_CURRENT_CONTEXT(ctx);

   GLint v[2];

   v[0] = v0;

   v[1] = v1;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_INT_VEC2);

}

void GLAPIENTRY

_mesa_Uniform3i(GLint location, GLint v0, GLint v1, GLint v2)

{

   GET_CURRENT_CONTEXT(ctx);

   GLint v[3];

   v[0] = v0;

   v[1] = v1;

   v[2] = v2;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_INT_VEC3);

}

void GLAPIENTRY

_mesa_Uniform4i(GLint location, GLint v0, GLint v1, GLint v2, GLint v3)

{

   GET_CURRENT_CONTEXT(ctx);

   GLint v[4];

   v[0] = v0;

   v[1] = v1;

   v[2] = v2;

   v[3] = v3;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_INT_VEC4);

}

void GLAPIENTRY

_mesa_Uniform1fv(GLint location, GLsizei count, const GLfloat * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_FLOAT);

}

void GLAPIENTRY

_mesa_Uniform2fv(GLint location, GLsizei count, const GLfloat * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_FLOAT_VEC2);

}

void GLAPIENTRY

_mesa_Uniform3fv(GLint location, GLsizei count, const GLfloat * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_FLOAT_VEC3);

}

void GLAPIENTRY

_mesa_Uniform4fv(GLint location, GLsizei count, const GLfloat * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_FLOAT_VEC4);

}

void GLAPIENTRY

_mesa_Uniform1iv(GLint location, GLsizei count, const GLint * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_INT);

}

void GLAPIENTRY

_mesa_Uniform2iv(GLint location, GLsizei count, const GLint * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_INT_VEC2);

}

void GLAPIENTRY

_mesa_Uniform3iv(GLint location, GLsizei count, const GLint * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_INT_VEC3);

}

void GLAPIENTRY

_mesa_Uniform4iv(GLint location, GLsizei count, const GLint * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_INT_VEC4);

}

/** OpenGL 3.0 GLuint-valued functions **/

void GLAPIENTRY

_mesa_Uniform1ui(GLint location, GLuint v0)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, &v0, GL_UNSIGNED_INT);

}

void GLAPIENTRY

_mesa_Uniform2ui(GLint location, GLuint v0, GLuint v1)

{

   GET_CURRENT_CONTEXT(ctx);

   GLuint v[2];

   v[0] = v0;

   v[1] = v1;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_UNSIGNED_INT_VEC2);

}

void GLAPIENTRY

_mesa_Uniform3ui(GLint location, GLuint v0, GLuint v1, GLuint v2)

{

   GET_CURRENT_CONTEXT(ctx);

   GLuint v[3];

   v[0] = v0;

   v[1] = v1;

   v[2] = v2;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_UNSIGNED_INT_VEC3);

}

void GLAPIENTRY

_mesa_Uniform4ui(GLint location, GLuint v0, GLuint v1, GLuint v2, GLuint v3)

{

   GET_CURRENT_CONTEXT(ctx);

   GLuint v[4];

   v[0] = v0;

   v[1] = v1;

   v[2] = v2;

   v[3] = v3;

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, 1, v, GL_UNSIGNED_INT_VEC4);

}

void GLAPIENTRY

_mesa_Uniform1uiv(GLint location, GLsizei count, const GLuint *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_UNSIGNED_INT);

}

void GLAPIENTRY

_mesa_Uniform2uiv(GLint location, GLsizei count, const GLuint *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_UNSIGNED_INT_VEC2);

}

void GLAPIENTRY

_mesa_Uniform3uiv(GLint location, GLsizei count, const GLuint *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_UNSIGNED_INT_VEC3);

}

void GLAPIENTRY

_mesa_Uniform4uiv(GLint location, GLsizei count, const GLuint *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform(ctx, ctx->Shader.ActiveProgram, location, count, value, GL_UNSIGNED_INT_VEC4);

}

void GLAPIENTRY

_mesa_UniformMatrix2fv(GLint location, GLsizei count, GLboolean transpose,

                          const GLfloat * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			2, 2, location, count, transpose, value);

}

void GLAPIENTRY

_mesa_UniformMatrix3fv(GLint location, GLsizei count, GLboolean transpose,

                          const GLfloat * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			3, 3, location, count, transpose, value);

}

void GLAPIENTRY

_mesa_UniformMatrix4fv(GLint location, GLsizei count, GLboolean transpose,

                          const GLfloat * value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			4, 4, location, count, transpose, value);

}

/**

 * Non-square UniformMatrix are OpenGL 2.1

 */

void GLAPIENTRY

_mesa_UniformMatrix2x3fv(GLint location, GLsizei count, GLboolean transpose,

                         const GLfloat *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			2, 3, location, count, transpose, value);

}

void GLAPIENTRY

_mesa_UniformMatrix3x2fv(GLint location, GLsizei count, GLboolean transpose,

                         const GLfloat *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			3, 2, location, count, transpose, value);

}

void GLAPIENTRY

_mesa_UniformMatrix2x4fv(GLint location, GLsizei count, GLboolean transpose,

                         const GLfloat *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			2, 4, location, count, transpose, value);

}

void GLAPIENTRY

_mesa_UniformMatrix4x2fv(GLint location, GLsizei count, GLboolean transpose,

                         const GLfloat *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			4, 2, location, count, transpose, value);

}

void GLAPIENTRY

_mesa_UniformMatrix3x4fv(GLint location, GLsizei count, GLboolean transpose,

                         const GLfloat *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			3, 4, location, count, transpose, value);

}

void GLAPIENTRY

_mesa_UniformMatrix4x3fv(GLint location, GLsizei count, GLboolean transpose,

                         const GLfloat *value)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_uniform_matrix(ctx, ctx->Shader.ActiveProgram,

			4, 3, location, count, transpose, value);

}

void GLAPIENTRY

_mesa_GetnUniformfvARB(GLhandleARB program, GLint location,

                       GLsizei bufSize, GLfloat *params)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_get_uniform(ctx, program, location, bufSize, GLSL_TYPE_FLOAT, params);

}

void GLAPIENTRY

_mesa_GetUniformfv(GLhandleARB program, GLint location, GLfloat *params)

{

   _mesa_GetnUniformfvARB(program, location, INT_MAX, params);

}

void GLAPIENTRY

_mesa_GetnUniformivARB(GLhandleARB program, GLint location,

                       GLsizei bufSize, GLint *params)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_get_uniform(ctx, program, location, bufSize, GLSL_TYPE_INT, params);

}

void GLAPIENTRY

_mesa_GetUniformiv(GLhandleARB program, GLint location, GLint *params)

{

   _mesa_GetnUniformivARB(program, location, INT_MAX, params);

}

/* GL3 */

void GLAPIENTRY

_mesa_GetnUniformuivARB(GLhandleARB program, GLint location,

                        GLsizei bufSize, GLuint *params)

{

   GET_CURRENT_CONTEXT(ctx);

   _mesa_get_uniform(ctx, program, location, bufSize, GLSL_TYPE_UINT, params);

}

void GLAPIENTRY

_mesa_GetUniformuiv(GLhandleARB program, GLint location, GLuint *params)

{

   _mesa_GetnUniformuivARB(program, location, INT_MAX, params);

}

/* GL4 */

void GLAPIENTRY

_mesa_GetnUniformdvARB(GLhandleARB program, GLint location,

                        GLsizei bufSize, GLdouble *params)

{

   GET_CURRENT_CONTEXT(ctx);

   (void) program;

   (void) location;

   (void) bufSize;

   (void) params;

   /*

   _mesa_get_uniform(ctx, program, location, bufSize, GLSL_TYPE_DOUBLE, params);

   */

   _mesa_error(ctx, GL_INVALID_OPERATION, "glGetUniformdvARB"

               "(GL_ARB_gpu_shader_fp64 not implemented)");

}

void GLAPIENTRY

_mesa_GetUniformdv(GLhandleARB program, GLint location, GLdouble *params)

{

   _mesa_GetnUniformdvARB(program, location, INT_MAX, params);

}

GLint GLAPIENTRY

_mesa_GetUniformLocation(GLhandleARB programObj, const GLcharARB *name)

{

   struct gl_shader_program *shProg;

   GLuint index, offset;

   GET_CURRENT_CONTEXT(ctx);

   shProg = _mesa_lookup_shader_program_err(ctx, programObj,

					    "glGetUniformLocation");

   if (!shProg)

      return -1;

   /* Page 80 (page 94 of the PDF) of the OpenGL 2.1 spec says:

    *

    *     "If program has not been successfully linked, the error

    *     INVALID_OPERATION is generated."

    */

   if (shProg->LinkStatus == GL_FALSE) {

      _mesa_error(ctx, GL_INVALID_OPERATION,

		  "glGetUniformLocation(program not linked)");

      return -1;

   }

   index = _mesa_get_uniform_location(ctx, shProg, name, &offset);

   if (index == GL_INVALID_INDEX)

      return -1;

   /* From the GL_ARB_uniform_buffer_object spec:

    *

    *     "The value -1 will be returned if  does not correspond to an

    *      active uniform variable name in , if  is associated

    *      with a named uniform block, or if  starts with the reserved

    *      prefix "gl_"."

    */

   if (shProg->UniformStorage[index].block_index != -1)

      return -1;

   return _mesa_uniform_merge_location_offset(shProg, index, offset);

}

GLuint GLAPIENTRY

_mesa_GetUniformBlockIndex(GLuint program,

			   const GLchar *uniformBlockName)

{

   GET_CURRENT_CONTEXT(ctx);

   GLuint i;

   struct gl_shader_program *shProg;

   if (!ctx->Extensions.ARB_uniform_buffer_object) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetUniformBlockIndex");

      return GL_INVALID_INDEX;

   }

   shProg = _mesa_lookup_shader_program_err(ctx, program,

					    "glGetUniformBlockIndex");

   if (!shProg)

      return GL_INVALID_INDEX;

   for (i = 0; i < shProg->NumUniformBlocks; i++) {

      if (!strcmp(shProg->UniformBlocks[i].Name, uniformBlockName))

	 return i;

   }

   return GL_INVALID_INDEX;

}

void GLAPIENTRY

_mesa_GetUniformIndices(GLuint program,

			GLsizei uniformCount,

			const GLchar * const *uniformNames,

			GLuint *uniformIndices)

{

   GET_CURRENT_CONTEXT(ctx);

   GLsizei i;

   struct gl_shader_program *shProg;

   if (!ctx->Extensions.ARB_uniform_buffer_object) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetUniformIndices");

      return;

   }

   shProg = _mesa_lookup_shader_program_err(ctx, program,

					    "glGetUniformIndices");

   if (!shProg)

      return;

   if (uniformCount < 0) {

      _mesa_error(ctx, GL_INVALID_VALUE,

		  "glGetUniformIndices(uniformCount < 0)");

      return;

   }

   for (i = 0; i < uniformCount; i++) {

      unsigned offset;

      uniformIndices[i] = _mesa_get_uniform_location(ctx, shProg,

						     uniformNames[i], &offset);

   }

}

void GLAPIENTRY

_mesa_UniformBlockBinding(GLuint program,

			  GLuint uniformBlockIndex,

			  GLuint uniformBlockBinding)

{

   GET_CURRENT_CONTEXT(ctx);

   struct gl_shader_program *shProg;

   if (!ctx->Extensions.ARB_uniform_buffer_object) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glUniformBlockBinding");

      return;

   }

   shProg = _mesa_lookup_shader_program_err(ctx, program,

					    "glUniformBlockBinding");

   if (!shProg)

      return;

   if (uniformBlockIndex >= shProg->NumUniformBlocks) {

      _mesa_error(ctx, GL_INVALID_VALUE,

		  "glUniformBlockBinding(block index %u >= %u)",

		  uniformBlockIndex, shProg->NumUniformBlocks);

      return;

   }

   if (uniformBlockBinding >= ctx->Const.MaxUniformBufferBindings) {

      _mesa_error(ctx, GL_INVALID_VALUE,

		  "glUniformBlockBinding(block binding %u >= %u)",

		  uniformBlockBinding, ctx->Const.MaxUniformBufferBindings);

      return;

   }

   if (shProg->UniformBlocks[uniformBlockIndex].Binding !=

       uniformBlockBinding) {

      int i;

      FLUSH_VERTICES(ctx, 0);

      ctx->NewDriverState |= ctx->DriverFlags.NewUniformBuffer;

      shProg->UniformBlocks[uniformBlockIndex].Binding = uniformBlockBinding;

      for (i = 0; i < MESA_SHADER_TYPES; i++) {

	 int stage_index = shProg->UniformBlockStageIndex[i][uniformBlockIndex];

	 if (stage_index != -1) {

	    struct gl_shader *sh = shProg->_LinkedShaders[i];

	    sh->UniformBlocks[stage_index].Binding = uniformBlockBinding;

	 }

      }

   }

}

void GLAPIENTRY

_mesa_GetActiveUniformBlockiv(GLuint program,

			      GLuint uniformBlockIndex,

			      GLenum pname,

			      GLint *params)

{

   GET_CURRENT_CONTEXT(ctx);

   struct gl_shader_program *shProg;

   struct gl_uniform_block *block;

   unsigned i;

   if (!ctx->Extensions.ARB_uniform_buffer_object) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetActiveUniformBlockiv");

      return;

   }

   shProg = _mesa_lookup_shader_program_err(ctx, program,

					    "glGetActiveUniformBlockiv");

   if (!shProg)

      return;

   if (uniformBlockIndex >= shProg->NumUniformBlocks) {

      _mesa_error(ctx, GL_INVALID_VALUE,

		  "glGetActiveUniformBlockiv(block index %u >= %u)",

		  uniformBlockIndex, shProg->NumUniformBlocks);

      return;

   }

   block = &shProg->UniformBlocks[uniformBlockIndex];

   switch (pname) {

   case GL_UNIFORM_BLOCK_BINDING:

      params[0] = block->Binding;

      return;

   case GL_UNIFORM_BLOCK_DATA_SIZE:

      params[0] = block->UniformBufferSize;

      return;

   case GL_UNIFORM_BLOCK_NAME_LENGTH:

      params[0] = strlen(block->Name) + 1;

      return;

   case GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS:

      params[0] = block->NumUniforms;

      return;

   case GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES:

      for (i = 0; i < block->NumUniforms; i++) {

	 unsigned offset;

	 params[i] = _mesa_get_uniform_location(ctx, shProg,

						block->Uniforms[i].IndexName,

						&offset);

      }

      return;

   case GL_UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER:

      params[0] = shProg->UniformBlockStageIndex[MESA_SHADER_VERTEX][uniformBlockIndex] != -1;

      return;

   case GL_UNIFORM_BLOCK_REFERENCED_BY_GEOMETRY_SHADER:

      params[0] = shProg->UniformBlockStageIndex[MESA_SHADER_GEOMETRY][uniformBlockIndex] != -1;

      return;

   case GL_UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER:

      params[0] = shProg->UniformBlockStageIndex[MESA_SHADER_FRAGMENT][uniformBlockIndex] != -1;

      return;

   default:

      _mesa_error(ctx, GL_INVALID_ENUM,

		  "glGetActiveUniformBlockiv(pname 0x%x (%s))",

		  pname, _mesa_lookup_enum_by_nr(pname));

      return;

   }

}

void GLAPIENTRY

_mesa_GetActiveUniformBlockName(GLuint program,

				GLuint uniformBlockIndex,

				GLsizei bufSize,

				GLsizei *length,

				GLchar *uniformBlockName)

{

   GET_CURRENT_CONTEXT(ctx);

   struct gl_shader_program *shProg;

   struct gl_uniform_block *block;

   if (!ctx->Extensions.ARB_uniform_buffer_object) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetActiveUniformBlockiv");

      return;

   }

   if (bufSize < 0) {

      _mesa_error(ctx, GL_INVALID_VALUE,

		  "glGetActiveUniformBlockName(bufSize %d < 0)",

		  bufSize);

      return;

   }

   shProg = _mesa_lookup_shader_program_err(ctx, program,

					    "glGetActiveUniformBlockiv");

   if (!shProg)

      return;

   if (uniformBlockIndex >= shProg->NumUniformBlocks) {

      _mesa_error(ctx, GL_INVALID_VALUE,

		  "glGetActiveUniformBlockiv(block index %u >= %u)",

		  uniformBlockIndex, shProg->NumUniformBlocks);

      return;

   }

   block = &shProg->UniformBlocks[uniformBlockIndex];

   if (uniformBlockName) {

      _mesa_copy_string(uniformBlockName, bufSize, length, block->Name);

   }

}

void GLAPIENTRY

_mesa_GetActiveUniformName(GLuint program, GLuint uniformIndex,

			   GLsizei bufSize, GLsizei *length,

			   GLchar *uniformName)

{

   GET_CURRENT_CONTEXT(ctx);

   struct gl_shader_program *shProg;

   if (!ctx->Extensions.ARB_uniform_buffer_object) {

      _mesa_error(ctx, GL_INVALID_OPERATION, "glGetActiveUniformBlockiv");

      return;

   }

   if (bufSize < 0) {

      _mesa_error(ctx, GL_INVALID_VALUE,

		  "glGetActiveUniformName(bufSize %d < 0)",

		  bufSize);

      return;

   }

   shProg = _mesa_lookup_shader_program_err(ctx, program, "glGetActiveUniformName");

   if (!shProg)

      return;

   if (uniformIndex >= shProg->NumUserUniformStorage) {

      _mesa_error(ctx, GL_INVALID_VALUE, "glGetActiveUniform(index)");

      return;

   }

   if (uniformName) {

      _mesa_get_uniform_name(& shProg->UniformStorage[uniformIndex],

                             bufSize, length, uniformName);

   }

}

void

_mesa_get_uniform_name(const struct gl_uniform_storage *uni,

                       GLsizei maxLength, GLsizei *length,

                       GLchar *nameOut)

{

   GLsizei localLength;

   if (length == NULL)

      length = &localLength;

   _mesa_copy_string(nameOut, maxLength, length, uni->name);

   /* Page 61 (page 73 of the PDF) in section 2.11 of the OpenGL ES 3.0

    * spec says:

    *

    *     "If the active uniform is an array, the uniform name returned in

    *     name will always be the name of the uniform array appended with

    *     "[0]"."

    *

    * The same text also appears in the OpenGL 4.2 spec.  It does not,

    * however, appear in any previous spec.  Previous specifications are

    * ambiguous in this regard.  However, either name can later be passed

    * to glGetUniformLocation (and related APIs), so there shouldn't be any

    * harm in always appending "[0]" to uniform array names.

    */

   if (uni->array_elements != 0) {

      int i;

      /* The comparison is strange because *length does *NOT* include the

       * terminating NUL, but maxLength does.

       */

      for (i = 0; i < 3 && (*length + i + 1) < maxLength; i++)

         nameOut[*length + i] = "[0]"[i];

      nameOut[*length + i] = '\0';

      *length += i;

   }

}