1 files changed, 37 insertions, 0 deletions
diff --git a/shaders/fbo_frag.glsl b/shaders/fbo_frag.glsl
new file mode 100644
index 0000000..e199245
--- /dev/null
+++ b/shaders/fbo_frag.glsl
@@ -0,0 +1,37 @@
+#version 330 core
+out vec4 FragColor;
+  
+in vec2 TexCoords;
+
+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 (renderState == 0) {
+        FragColor = texture(shadowmapTexture, 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;
+    }
+}