126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
#pragma once
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#include <GLFW/glfw3.h>
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void checkCode(int code, char* errorMsg) {
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if (code < 0) {
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fprintf(stderr, "Application Error %i: %s\n", code, errorMsg);
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exit(1);
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}
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}
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void* checkPtr(void *ptr, char* errorMsg) {
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if (ptr == NULL) {
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fprintf(stderr, "Application Error: %s\n", errorMsg);
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exit(1);
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}
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return ptr;
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}
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void checkShader(unsigned int shader, int statusFlag, char* actionName) {
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int success;
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glGetShaderiv(shader, statusFlag, &success);
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if (success < 0) {
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fprintf(stderr, "%s Error %i\n", actionName, success);
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exit(1);
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}
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}
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char *loadText(char* path) {
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char *buffer = NULL;
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FILE *f = fopen(path, "r");
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if (f == NULL) {
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return NULL;
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}
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if (fseek(f, 0, SEEK_END) != 0) {
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return NULL;
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}
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i16 length = ftell(f);
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if (length == -1) {
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return NULL;
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}
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buffer = malloc((length + 1) * sizeof(char));
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if (fseek(f, 0, SEEK_SET) != 0) {
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return NULL;
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}
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usize newLen = fread(buffer, sizeof(char), length, f);
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if (ferror(f) != 0) {
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return NULL;
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} else {
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buffer[newLen] = '\0';
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}
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fclose(f);
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return buffer;
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}
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void checkCompileErrors(unsigned int object, char* type)
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{
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int success;
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char infoLog[1024];
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if (strcmp("PROGRAM", type))
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{
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glGetShaderiv(object, GL_COMPILE_STATUS, &success);
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if (!success)
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{
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glGetShaderInfoLog(object, 1024, NULL, infoLog);
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fprintf(stderr, "| ERROR::SHADER: Compile-time error: Type: %s \n %s\n", type, infoLog);
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}
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}
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else
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{
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glGetProgramiv(object, GL_LINK_STATUS, &success);
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if (!success)
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{
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glGetProgramInfoLog(object, 1024, NULL, infoLog);
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fprintf(stderr, "| ERROR::Shader: Link-time error: Type: %s \n %s\n", type, infoLog);
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}
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}
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}
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unsigned int compileShaderProgram(char* vertSrcPath, char* fragSrcPath, char* geoSrcPath) {
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unsigned int vertShader, fragShader, geoShader;
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char* vertSrc = loadText(vertSrcPath);
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vertShader = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertShader, 1, (const GLchar* const*)&vertSrc, NULL);
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glCompileShader(vertShader);
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checkCompileErrors(vertShader, "VERTEX");
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char* fragSrc = loadText(fragSrcPath);
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fragShader = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragShader, 1, (const GLchar* const*)&fragSrc, NULL);
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glCompileShader(fragShader);
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checkCompileErrors(fragShader, "FRAGMENT");
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char* geoSrc = NULL;
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if (geoSrcPath != NULL) {
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geoSrc = loadText(geoSrcPath);
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geoShader = glCreateShader(GL_GEOMETRY_SHADER);
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glShaderSource(geoShader, 1, (const GLchar* const*)&geoSrc, NULL);
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glCompileShader(geoShader);
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checkCompileErrors(geoShader, "GEOMETRY");
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}
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unsigned int program = glCreateProgram();
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glAttachShader(program, vertShader);
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glAttachShader(program, fragShader);
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if (geoSrcPath != NULL) {
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glAttachShader(program, geoShader);
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}
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glLinkProgram(program);
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checkCompileErrors(program, "PROGRAM");
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glDeleteShader(vertShader);
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glDeleteShader(fragShader);
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free(vertSrc);
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free(fragSrc);
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if (geoSrc != NULL) {
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free(geoSrc);
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}
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return program;
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}
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