file reading

fragment.glsl

@@ -1,3 +1,9 @@
-void main() {
+#version 330 core
-	gl_FragColor = vec4(1.0,0.0,1.0,1.0);
+out vec4 FragColor;
+in vec2 uv;
+uniform vec2 WindowSize;
+
+void main()
+{
+    FragColor = vec4(gl_FragCoord.xy / WindowSize, 0.0, 1.0);
 }

main.c

@@ -1,6 +1,7 @@
 #define GL_GLEXT_PROTOTYPES
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <GL/gl.h>
 #include <SDL3/SDL.h>
 
@@ -11,17 +12,6 @@ void checkGlError() {
     }
 }
 
-const char *fragment_shader_source =
-"#version 330 core\n"
-"out vec4 FragColor;\n"
-"in vec2 uv;\n"
-"uniform vec2 WindowSize;\n"
-"\n"
-"void main()\n"
-"{\n"
-"    FragColor = vec4(gl_FragCoord.xy / WindowSize, 0.0, 1.0);\n"
-"}\n";
-
 GLuint compile_shader(GLuint type, const char *src) {
     GLuint id = glCreateShader(GL_FRAGMENT_SHADER);
     glShaderSource(id, 1, &src, 0);
@@ -55,6 +45,21 @@ GLuint create_shader(const char *fragment_src) {
     return program;
 }
 
+GLuint load_shader(const char *path) {
+    FILE *handle = fopen(path, "r");
+    fseek(handle, 0L, SEEK_END);
+    long length = ftell(handle);
+    fseek(handle, 0L, SEEK_SET);
+    char *string = malloc(length * sizeof(char));
+    fread(string, sizeof(char), length, handle);
+    fclose(handle);
+
+    GLuint shader = create_shader(string);
+
+    free(string);
+    return shader;
+}
+
 int main() {
     printf("Good Morning 🍵\n");
     SDL_Init(SDL_INIT_VIDEO);
@@ -79,7 +84,7 @@ int main() {
     int running = 1;
     float angle = 0.0;
 
-    GLuint shader = create_shader(fragment_shader_source);
+    GLuint shader = load_shader("fragment.glsl"); //create_shader(fragment_shader_source);
     glUseProgram(shader);
 
     int w, h;