139 lines
3.0 KiB
C++
139 lines
3.0 KiB
C++
#include <opengl-playground/openglshader.hpp>
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OpenGlShaderProgram::OpenGlShaderProgram(std::string vertex_file, std::string geometry_file, std::string fragment_file)
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{
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this->vertex_file = vertex_file;
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this->geometry_file = geometry_file;
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this->fragment_file = fragment_file;
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this->compiled = false;
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}
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char *load_shader_program_from_file(std::string file_name)
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{
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return NULL;
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}
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int OpenGlShaderProgram::compile()
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{
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int ret_code = 0;
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int success;
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char info_log[512];
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unsigned int vertex_shader, geometry_shader, fragment_shader;
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bool vertex_b = false, geo_b = false, frag_b = false;
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char *src_code;
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if (this->compiled) {
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glDeleteProgram(shader_program);
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this->compiled = false;
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}
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this->shader_program = glCreateProgram();
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if (!vertex_file.empty()) {
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vertex_b = true;
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/* Compile the vertex shader */
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vertex_shader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertex_shader, 1, &src_code, NULL);
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glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &success);
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free(src_code);
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if (!success) {
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glGetShaderInfoLog(vertex_shader, 512, NULL, info_log);
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fprintf(stderr, "%s\n", info_log);
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ret_code = -1;
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goto delete_vertex;
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}
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glAttachShader(this->shader_program, vertex_shader);
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}
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if (!this->geometry_file.empty()) {
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geo_b = true;
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/* Compile the vertex shader */
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geometry_shader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(geometry_shader, 1, &src_code, NULL);
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glGetShaderiv(geometry_shader, GL_COMPILE_STATUS, &success);
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free(src_code);
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if (!success) {
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glGetShaderInfoLog(geometry_shader, 512, NULL, info_log);
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fprintf(stderr, "%s\n", info_log);
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ret_code = -1;
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goto delete_geo;
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}
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glAttachShader(this->shader_program, geometry_shader);
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}
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if (!this->fragment_file.empty()) {
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frag_b = true;
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/* Compile the vertex shader */
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fragment_shader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(fragment_shader, 1, &src_code, NULL);
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glGetShaderiv(fragment_shader, GL_COMPILE_STATUS, &success);
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free(src_code);
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if (!success) {
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glGetShaderInfoLog(fragment_shader, 512, NULL, info_log);
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fprintf(stderr, "%s\n", info_log);
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ret_code = -1;
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goto delete_frag;
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}
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glAttachShader(this->shader_program, fragment_shader);
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}
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glLinkProgram(this->shader_program);
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glGetShaderiv(this->shader_program, GL_LINK_STATUS, &success);
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if (!success) {
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glGetShaderInfoLog(this->shader_program, 512, NULL, info_log);
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printf("%s\n", info_log);
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ret_code = -2;
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}
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this->compiled = true;
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delete_frag:
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if (frag_b)
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glDeleteShader(fragment_shader);
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delete_geo:
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if (geo_b)
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glDeleteShader(geometry_shader);
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delete_vertex:
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if (vertex_b)
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glDeleteShader(vertex_shader);
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if (ret_code) {
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this->compiled = false;
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glDeleteProgram(this->shader_program);
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this->shader_program = 0;
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}
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return ret_code;
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}
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void OpenGlShaderProgram::unload()
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{
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if (this->compiled) {
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glDeleteProgram(this->shader_program);
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}
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this->compiled = false;
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}
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int OpenGlShaderProgram::use()
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{
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if (!this->compiled)
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return -1;
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glUseProgram(this->shader_program);
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return 0;
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}
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