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 ++++++++++++++++++++++++--------------------
 shaders/frag.glsl            | 32 -----------------------------
 shaders/frag_irradiance.glsl | 34 +++++++++++++++++++++++++++++++
 shaders/frag_shadowmap.glsl  | 14 +++++++++++++
 4 files changed, 74 insertions(+), 54 deletions(-)
 delete mode 100644 shaders/frag.glsl
 create mode 100644 shaders/frag_irradiance.glsl
 create mode 100644 shaders/frag_shadowmap.glsl

(limited to 'shaders')

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;
     }
 }
diff --git a/shaders/frag.glsl b/shaders/frag.glsl
deleted file mode 100644
index a70915a..0000000
--- a/shaders/frag.glsl
+++ /dev/null
@@ -1,32 +0,0 @@
-#version 330 core
-
-in vec3 FragPos;
-in vec3 Normal;
-
-out vec4 FragColor;
-
-uniform vec3 objectColor;
-uniform vec3 lightColor;
-uniform vec3 lightPos;
-uniform vec3 viewPos;
-
-void main()
-{
-  vec3 norm = normalize(Normal);
-  vec3 lightDir = normalize(lightPos - FragPos);
-
-  float diff = max(dot(norm, lightDir), 0.0);
-  vec3 diffuse = diff * lightColor;
-
-  float ambientStrength = 0.1;
-  vec3 ambient = ambientStrength * lightColor;
-
-  float specularStrength = 0.5;
-  vec3 viewDir = normalize(viewPos - FragPos);
-  vec3 reflectDir = reflect(-lightDir, norm);
-  float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
-  vec3 specular = specularStrength * spec * lightColor;
-
-  vec3 result = (ambient + diffuse + specular) * objectColor;
-  FragColor = vec4(result, 1.0f);
-}
diff --git a/shaders/frag_irradiance.glsl b/shaders/frag_irradiance.glsl
new file mode 100644
index 0000000..9e14ebe
--- /dev/null
+++ b/shaders/frag_irradiance.glsl
@@ -0,0 +1,34 @@
+#version 330 core
+
+in vec3 FragPos;
+in vec3 Normal;
+
+out vec4 FragColor;
+
+uniform sampler2D shadowmapTexture;
+
+uniform vec3 objectColor;
+uniform vec3 lightColor;
+uniform vec3 lightPos;
+uniform vec3 viewPos;
+
+void main()
+{
+  vec3 norm = normalize(Normal);
+  vec3 lightDir = normalize(lightPos - FragPos);
+
+  float diff = max(dot(norm, lightDir), 0.0);
+  vec3 diffuse = diff * lightColor;
+
+  float ambientStrength = 0.1;
+  vec3 ambient = ambientStrength * lightColor;
+
+  float specularStrength = 0.5;
+  vec3 viewDir = normalize(viewPos - FragPos);
+  vec3 reflectDir = reflect(-lightDir, norm);
+  float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
+  vec3 specular = specularStrength * spec * lightColor;
+
+  vec3 result = (ambient + diffuse + specular) * objectColor;
+  FragColor = vec4(result, 1.0f);
+}
diff --git a/shaders/frag_shadowmap.glsl b/shaders/frag_shadowmap.glsl
new file mode 100644
index 0000000..6d6dab6
--- /dev/null
+++ b/shaders/frag_shadowmap.glsl
@@ -0,0 +1,14 @@
+
+#version 330 core
+
+in vec3 FragPos;
+
+out vec4 FragColor;
+
+uniform vec3 lightPos;
+
+void main()
+{
+  float lightDist = 1 - (length(lightPos - FragPos) - 5.5);
+  FragColor = vec4(vec3(lightDist), 1);
+}
-- 
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