thinking about shaders

shaders/forward.frag

@@ -36,16 +36,17 @@ float fetch_shadow(int light_id, vec4 homogeneous_coords) {
     if (homogeneous_coords.w <= 0.0) {
         return 1.0;
     }
-    // compensate for the Y-flip difference between the NDC and texture coordinates
+    // compensate for the Y-flip difference between the normalized device
+    // coordinates (NDC) and texture coordinates
     const vec2 flip_correction = vec2(0.5, -0.5);
     // compute texture coordinates for shadow lookup
     vec4 light_local = vec4(
         // I don't know what kind of jank shit is going on on this line
         homogeneous_coords.xy * flip_correction/homogeneous_coords.w + 0.5,
-        light_id,
-        homogeneous_coords.z / homogeneous_coords.w
+        light_id, // array layer
+        homogeneous_coords.z / homogeneous_coords.w // D-Ref
     );
-    // do the lookup, using HW PCF and comparison
+    // do the lookup, using HW percentage closer filtering(PCF) and comparison
     return texture(sampler2DArrayShadow(t_Shadow, s_Shadow), light_local);
 }
 

shaders/g_buffer_input.frag

@@ -0,0 +1,4 @@
+#version 450
+
+void main() {
+}

shaders/g_buffer_input.vert

@@ -0,0 +1,20 @@
+#version 450
+
+layout(location = 0) in vec4 a_Pos;
+
+layout(set = 0, binding = 0) uniform Globals {
+    mat4 u_ViewProj;
+};
+
+layout(set = 0, binding = 1) uniform Globals {
+    mat4 u_ViewProj;
+};
+
+layout(set = 1, binding = 0) uniform Entity {
+    mat4 u_World;
+    vec4 u_Color;
+};
+
+void main() {
+    gl_Position = u_ViewProj * u_World * vec4(a_Pos);
+}