From e03792c2d5620ca07ac50717062df846927027c0 Mon Sep 17 00:00:00 2001
From: Patrick Schönberger
Date: Wed, 10 Feb 2021 11:52:27 +0100
Subject: render shadowmap and irradiance

---
 shaders/fbo_frag.glsl | 48 ++++++++++++++++++++++++++----------------------
 1 file changed, 26 insertions(+), 22 deletions(-)

(limited to 'shaders/fbo_frag.glsl')

diff --git a/shaders/fbo_frag.glsl b/shaders/fbo_frag.glsl
index f6f12cd..e199245 100644
--- a/shaders/fbo_frag.glsl
+++ b/shaders/fbo_frag.glsl
@@ -3,31 +3,35 @@ out vec4 FragColor;
   
 in vec2 TexCoords;
 
-uniform sampler2D screenTexture;
-uniform int applySSSSS;
-uniform int N;
+uniform sampler2D shadowmapTexture;
+uniform sampler2D irradianceTexture;
+uniform int screenWidth;
+uniform int screenHeight;
+uniform int renderState;
+uniform vec2 samplePositions[13];
+uniform vec3 sampleWeights[13];
 
 void main()
 {
-    if (applySSSSS == 1) {
-        float x = 1.0/1600.0;
-        float y = 1.0/900.0;
-
-        float maxDist = N*N + N*N;
-
-        vec4 color = vec4(0, 0, 0, 1);
-        for (int i = -N; i <= N; i++) {
-            for (int j = -N; j <= N; j++) {
-                float dist = i*i + j*j;
-                vec4 newC = texture(screenTexture, TexCoords + vec2(i*x, j*y)) / (2*N*N);
-                float factor = 1 - (dist / maxDist);
-                factor = pow(factor, 2);
-                color += newC * factor;
-            }
-        }
-        FragColor = color;
+    if (renderState == 0) {
+        FragColor = texture(shadowmapTexture, TexCoords);
     }
-    else {
-        FragColor = texture(screenTexture, TexCoords);
+    // stencil buffer
+    else if (renderState == 1 || texture(irradianceTexture, TexCoords).rgb == vec3(0, 0, 0)) {
+        FragColor = texture(irradianceTexture, TexCoords);
+    }
+    else if (renderState == 2) {
+        FragColor = texture(shadowmapTexture, TexCoords) * texture(irradianceTexture, TexCoords);
+    }
+    else if (renderState == 3) {
+        vec4 result = vec4(0, 0, 0, 1);
+        for (int i = 0; i < 13; i++) {
+            float oneX = 1.0/screenWidth;
+            float oneY = 1.0/screenHeight;
+            vec4 sample = texture(irradianceTexture, TexCoords + samplePositions[i] * vec2(oneX, oneY));
+            vec4 weight = vec4(sampleWeights[i], 1);
+            result += sample * weight;
+        }
+        FragColor = result;
     }
 }
-- 
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