89 lines
2.8 KiB
C++
89 lines
2.8 KiB
C++
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/*
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* Copyright © 2011 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file shader_query.cpp
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* C-to-C++ bridge functions to query GLSL shader data
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*
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* \author Ian Romanick <ian.d.romanick@intel.com>
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*/
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#include "main/core.h"
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#include "glsl_symbol_table.h"
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#include "ir.h"
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#include "shaderobj.h"
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extern "C" {
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#include "shaderapi.h"
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}
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GLint GLAPIENTRY
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_mesa_GetAttribLocationARB(GLhandleARB program, const GLcharARB * name)
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{
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GET_CURRENT_CONTEXT(ctx);
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struct gl_shader_program *const shProg =
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_mesa_lookup_shader_program_err(ctx, program, "glGetAttribLocation");
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if (!shProg) {
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return -1;
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}
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if (!shProg->LinkStatus) {
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_mesa_error(ctx, GL_INVALID_OPERATION,
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"glGetAttribLocation(program not linked)");
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return -1;
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}
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if (!name)
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return -1;
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/* Not having a vertex shader is not an error.
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*/
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if (shProg->_LinkedShaders[MESA_SHADER_VERTEX] == NULL)
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return -1;
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exec_list *ir = shProg->_LinkedShaders[MESA_SHADER_VERTEX]->ir;
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foreach_list(node, ir) {
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const ir_variable *const var = ((ir_instruction *) node)->as_variable();
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/* The extra check against VERT_ATTRIB_GENERIC0 is because
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* glGetAttribLocation cannot be used on "conventional" attributes.
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*
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* From page 95 of the OpenGL 3.0 spec:
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*
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* "If name is not an active attribute, if name is a conventional
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* attribute, or if an error occurs, -1 will be returned."
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*/
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if (var == NULL
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|| var->mode != ir_var_in
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|| var->location == -1
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|| var->location < VERT_ATTRIB_GENERIC0)
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continue;
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if (strcmp(var->name, name) == 0)
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return var->location - VERT_ATTRIB_GENERIC0;
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}
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return -1;
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}
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