mirror of
https://github.com/outbackdingo/UltraGrid.git
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90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
/**
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* Copyright (c) 2011, Martin Srom
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "dxt_common.h"
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#include "dxt_util.h"
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/** Documented at declaration */
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GLuint
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dxt_shader_create_from_source(const char* source, GLenum type)
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{
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// Create shader
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GLuint shader = glCreateShader(type);
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// Compile shader source
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glShaderSource(shader, 1, (const GLchar**)&source, NULL);
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glCompileShader(shader);
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// Check result
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GLint status;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
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if ( status == GL_FALSE ) {
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char log[32768];
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glGetShaderInfoLog(shader, 32768, NULL, (GLchar*)log);
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printf("Shader Compilation Failed : %s\n", log);
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return 0;
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}
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return shader;
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}
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/** Documented at declaration */
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GLuint
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dxt_shader_create_from_file(const char* filename, GLenum type)
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{
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// Load program from file
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FILE* file;
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file = fopen(filename, "r");
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if ( !file ) {
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fprintf(stderr, "Failed open %s for reading!\n", filename);
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return 0;
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}
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fseek(file, 0, SEEK_END);
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int data_size = ftell(file);
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assert(data_size >= 0);
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rewind(file);
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char* program = (char*)malloc((data_size + 1) * sizeof(char));
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if ( (size_t) data_size != fread(program, sizeof(char), data_size, file) ) {
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fprintf(stderr, "Failed to load program [%d bytes] from file %s!\n", data_size, filename);
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free(program);
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fclose(file);
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return 0;
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}
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fclose(file);
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program[data_size] = '\0';
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printf("Compiling program [%s]...\n", filename);
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GLuint shader = dxt_shader_create_from_source(program, type);
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if ( shader == 0 ) {
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free(program);
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return 0;
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}
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free(program);
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return shader;
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}
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