can write to any location

shaders/frag.glsl

@@ -3,7 +3,7 @@
 uniform float iTime;
 uniform vec2 iResolution;
 in vec2 vUV;
-out vec3 fragColor;
+layout(location = 0) out vec3 fragColor;
 uniform sampler2D frame0;
 
 void main() {
@@ -12,5 +12,5 @@ void main() {
     vec2 uv1 = (uv0 - .5) * vec2(ratio, 1);
     vec3 color = vec3(vUV, sin(iTime * 0.5) * 0.5 + 0.5);
     color *= 1 - step(cos(iTime) * 0.1 + 0.4, length(uv1));
-    fragColor = color + texture(frame0, vUV - 0.01).xyz * 0.5;
+    fragColor = color + texture(frame0, vUV - 0.04).xyz * 0.5;
 }

src/logs.h

@@ -12,10 +12,10 @@
 #define ANSI_COLOR_RESET "\x1b[0m"
 
 #define log_debug(format, ...)                                                 \
-  fprintf(stderr, ANSI_COLOR_MAGENTA "[DEBUG] " format ANSI_COLOR_RESET        \
+  fprintf(stderr, ANSI_COLOR_MAGENTA "[DEBG] " format ANSI_COLOR_RESET         \
                                      "\n" __VA_OPT__(, ) __VA_ARGS__)
 #define log_success(format, ...)                                               \
-  fprintf(stdout, ANSI_COLOR_GREEN "[SUCCESS] " format ANSI_COLOR_RESET        \
+  fprintf(stdout, ANSI_COLOR_GREEN "[SUCC] " format ANSI_COLOR_RESET           \
                                    "\n" __VA_OPT__(, ) __VA_ARGS__)
 #define log_info(format, ...)                                                  \
   fprintf(stdout, "[INFO] " format "\n" __VA_OPT__(, ) __VA_ARGS__)
@@ -23,7 +23,7 @@
   fprintf(stderr, ANSI_COLOR_YELLOW "[WARN] " format ANSI_COLOR_RESET          \
                                     "\n" __VA_OPT__(, ) __VA_ARGS__)
 #define log_error(format, ...)                                                 \
-  fprintf(stderr, ANSI_COLOR_RED "[ERROR] " format ANSI_COLOR_RESET            \
+  fprintf(stderr, ANSI_COLOR_RED "[FAIL] " format ANSI_COLOR_RESET             \
                                  "\n" __VA_OPT__(, ) __VA_ARGS__)
 
 #endif

src/shaders.c

@@ -56,17 +56,19 @@ bool init_textures(ShaderProgram *program, Context context) {
 }
 
 void init_framebuffers(ShaderProgram *program) {
-  int i;
+  int i, j;
 
   glGenFramebuffers(BUFFER_COUNT, program->frame_buffers);
 
   for (i = 0; i < BUFFER_COUNT; i++) {
     glBindFramebuffer(GL_FRAMEBUFFER, program->frame_buffers[i]);
 
+    for (j = 0; j < BUFFER_COUNT; j++) {
       // attaches a selected mipmap level or image of a texture object as one of
       // the logical buffers of the framebuffer object
-    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+      glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + j,
-                           program->textures[i], 0);
+                             GL_TEXTURE_2D, program->textures[j], 0);
+    }
 
     // check framebuffer status
     if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
@@ -77,6 +79,8 @@ void init_framebuffers(ShaderProgram *program) {
 
       return;
     }
+
+    log_success("Framebuffer %d initialized", i);
   }
 
   return;
@@ -157,9 +161,7 @@ void init_single_program(ShaderProgram *program, int i, bool output) {
 }
 
 ShaderProgram init_program(File fragment_shader, Context context) {
-  int i, j;
+  int i;
-  char uniform_name[32];
-
   ShaderProgram program = {.error = false,
                            .last_width = context.width,
                            .last_height = context.height};