106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
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#include "shader.hpp"
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#include "common.hpp"
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#include "vendor/glad/glad.h"
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#include <cstdio>
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#include <cstring>
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#include <cerrno>
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#include <cstdlib>
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unsigned int create_shader(unsigned int type, const char **source)
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{
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unsigned int shader = glCreateShader(type);
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if (!shader) {
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printf("err: create_shader: glCreateShader returned 0\n");
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return 0;
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}
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glShaderSource(shader, 1, source, NULL);
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glCompileShader(shader);
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int success;
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glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
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if (!success) {
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char log[512];
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glGetShaderInfoLog(shader, 512, NULL, log);
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printf("err: create_shader: compilation failed, log: %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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unsigned int create_program_source(const char *vertex_shader_source, const char *fragment_shader_source)
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{
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unsigned int program = glCreateProgram();
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if (!program) {
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printf("err: create_program: glCreateProgram returned 0\n");
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return 0;
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}
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unsigned int vertex_shader = create_shader(GL_VERTEX_SHADER, &vertex_shader_source);
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if (!vertex_shader) {
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printf("err: create_program: create_shader failed returned 0 (vertex_shader)\n");
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return 0;
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}
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unsigned int fragment_shader = create_shader(GL_FRAGMENT_SHADER, &fragment_shader_source);
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if (!fragment_shader) {
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printf("err: create_program: create_shader failed returned 0 (fragment_shader)\n");
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return 0;
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}
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glAttachShader(program, vertex_shader);
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glAttachShader(program, fragment_shader);
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glLinkProgram(program);
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int success;
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glGetProgramiv(program, GL_LINK_STATUS, &success);
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if (!success) {
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char log[512];
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glGetProgramInfoLog(program, 512, NULL, log);
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printf("err: create_program: link failed, log: %s\n", log);
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return 0;
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}
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return program;
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}
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unsigned int create_program(const char *vertex_shader_path, const char *fragment_shader_path)
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{
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FILE *vertex_shader_file, *fragment_shader_file = NULL;
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char *vertex_shader_source = NULL;
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char *fragment_shader_source = NULL;
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Errno err = 0;
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unsigned int ret = 0;
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vertex_shader_file = fopen(vertex_shader_path, "r");
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if (!vertex_shader_file) {
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fprintf(stderr, "create_program: failed to open vertex shader file (%s): %s\n", vertex_shader_path, strerror(errno));
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goto done;
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}
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err = read_entire_file(vertex_shader_file, &vertex_shader_source);
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if (err) {
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fprintf(stderr, "create_program: failed to read vertex shader file (%s): %s\n", vertex_shader_path, strerror(err));
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goto done;
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}
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fragment_shader_file = fopen(fragment_shader_path, "r");
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if (!fragment_shader_file) {
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fprintf(stderr, "create_program: failed to open fragment shader file (%s): %s\n", fragment_shader_path, strerror(errno));
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goto done;
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}
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err = read_entire_file(fragment_shader_file, &fragment_shader_source);
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if (err) {
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fprintf(stderr, "create_program: failed to read fragment shader file (%s): %s\n", fragment_shader_path, strerror(err));
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goto done;
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}
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ret = create_program_source(vertex_shader_source, fragment_shader_source);
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done:
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if (vertex_shader_file) fclose(vertex_shader_file);
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if (fragment_shader_file) fclose(fragment_shader_file);
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if (vertex_shader_source) free(vertex_shader_source);
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if (fragment_shader_source) free(fragment_shader_source);
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return ret;
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}
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