strichmaennchen git · main

#include "glfuncs.h"

#include <stdio.h>
#include <stdlib.h>


char* readFile(const char* path) {
    FILE* f = fopen(path, "rb");
    if (!f) return NULL;

    fseek(f, 0, SEEK_END);
    long size = ftell(f);
    rewind(f);

    char* buffer = malloc(size + 1);  // +1 for '\0'
    if (!buffer) { fclose(f); return NULL; }

    size_t read = fread(buffer, 1, size, f);
    fclose(f);

    if (read != (size_t)size) {
        fprintf(stderr, "Failed to read entire file\n");
        free(buffer);
        return NULL;
    }

    buffer[size] = '\0';  // null-terminate
    return buffer;
}

GLuint loadShader(GLenum type, const char* source) {
    GLuint shader = glCreateShader(type);
    glShaderSource(shader, 1, &source, NULL);
    glCompileShader(shader);

    GLint success;
    glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
    if (!success) {
        char log[512];
        glGetShaderInfoLog(shader, 512, NULL, log);
        fprintf(stderr, "Shader compile error: %s\n", log);
    }
    return shader;
}

GLuint createShaderProgram(const char* vertSrc, const char* fragSrc) {
    GLuint vertex = loadShader(GL_VERTEX_SHADER, vertSrc);
    GLuint fragment = loadShader(GL_FRAGMENT_SHADER, fragSrc);
    GLuint program = glCreateProgram();
    glAttachShader(program, vertex);
    glAttachShader(program, fragment);
    glLinkProgram(program);


    GLint success;
    glGetProgramiv(program, GL_LINK_STATUS, &success);
    if (!success) {
        char log[512];
        glGetProgramInfoLog(program, 512, NULL, log);
        fprintf(stderr, "Shader link error: %s\n", log);
    }
    glDeleteShader(vertex);
    glDeleteShader(fragment);
    return program;
}