p

main.c

@@ -13,8 +13,9 @@ void checkGlError() {
     }
 }
 
+/// returns 0 if failed.
 GLuint compile_shader(GLuint type, const char *src) {
-    GLuint id = glCreateShader(GL_FRAGMENT_SHADER);
+    GLuint id = glCreateShader(type);
     glShaderSource(id, 1, &src, 0);
     glCompileShader(id);
 
@@ -34,16 +35,19 @@ GLuint compile_shader(GLuint type, const char *src) {
     return id;
 }
 
+/// returns 0 if failed.
 GLuint create_shader(const char *fragment_src) {
     GLuint program = glCreateProgram();
     GLuint fragment_shader = compile_shader(GL_FRAGMENT_SHADER, fragment_src);
-
-    glAttachShader(program, fragment_shader);
-    glLinkProgram(program);
-    glValidateProgram(program);
-    glDeleteShader(fragment_shader);
-
-    return program;
+    if (!(fragment_shader == 0)) {
+        glAttachShader(program, fragment_shader);
+        glLinkProgram(program);
+        glValidateProgram(program);
+        glDeleteShader(fragment_shader);
+        return program;
+    } else {
+        return 0;
+    }
 }
 
 GLuint load_shader(const char *path) {
@@ -60,6 +64,21 @@ GLuint load_shader(const char *path) {
 
     GLuint shader = create_shader(string);
 
+    if (shader == 0) {
+        // print file
+        int line_count = 1;
+        printf("%i\t", line_count);
+        line_count++;
+        for (int i = 0; i < length; i++) {
+            printf("%c", string[i]);
+            if (string[i] == '\n') {
+                printf("%i\t", line_count);
+                line_count++;
+            }
+        }
+        printf("\n");
+    }
+
     free(string);
     return shader;
 }