X-Git-Url: https://gitweb.ps.run/subsurface_scattering/blobdiff_plain/cedffd5cf24c1a3ed64161475c806c55135406be..a0fdc6d882a1755d0b0607ba3d9bb55e7f8ac006:/shaders/vert_irradiance.glsl

diff --git a/shaders/vert_irradiance.glsl b/shaders/vert_irradiance.glsl
new file mode 100644
index 0000000..25770f6
--- /dev/null
+++ b/shaders/vert_irradiance.glsl
@@ -0,0 +1,77 @@
+#version 330 core
+
+layout (location = 0) in vec3 pos;
+layout (location = 1) in vec3 normal;
+
+out vec3 FragPos;
+out vec3 LocalPos;
+out vec3 Backside;
+out float BacksideIrradiance;
+out vec3 Normal;
+
+uniform sampler2D shadowmapTexture;
+uniform vec3 lightPos;
+uniform vec2 samplePositions[13];
+uniform vec3 sampleWeights[13];
+uniform int screenWidth;
+uniform int screenHeight;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 lightView;
+uniform mat4 lightViewInv;
+uniform mat4 projection;
+uniform mat4 lightProjection;
+
+vec4 blur(sampler2D tex, vec2 uv, vec2 res) {
+  float Pi = 6.28318530718; // Pi*2
+    
+  // GAUSSIAN BLUR SETTINGS {{{
+  float Directions = 16.0; // BLUR DIRECTIONS (Default 16.0 - More is better but slower)
+  float Quality = 4.0; // BLUR QUALITY (Default 4.0 - More is better but slower)
+  float Size = 8.0; // BLUR SIZE (Radius)
+  // GAUSSIAN BLUR SETTINGS }}}
+  
+  vec2 Radius = Size/res;
+  
+  // Pixel colour
+  vec4 Color = texture(tex, uv);
+  
+  // Blur calculations
+  for( float d=0.0; d<Pi; d+=Pi/Directions) {
+    for(float i=1.0/Quality; i<=1.0; i+=1.0/Quality) {
+      Color += texture( tex, uv+vec2(cos(d),sin(d))*Radius*i);		
+    }
+  }
+  
+  // Output to screen
+  Color /= Quality * Directions - 15.0;
+  return Color;
+}
+
+void main()
+{
+  gl_Position = projection * view * model * vec4(pos, 1.0);
+  FragPos = vec3(model * vec4(pos, 1));
+  LocalPos = pos;
+  Normal = normal;
+  
+  vec4 lightSpace = lightProjection * lightView * model * vec4(pos, 1.0);
+  lightSpace = lightSpace / lightSpace.w;
+  vec2 shadowmapCoords = lightSpace.xy;
+  shadowmapCoords = vec2(
+    (shadowmapCoords.x * 0.99 + 1) / 2,
+    (shadowmapCoords.y * 0.99 + 1) / 2
+  );
+
+
+  // blur
+  vec4 t = texture(shadowmapTexture, shadowmapCoords);
+  //vec4 t = blur(shadowmapTexture, shadowmapCoords, vec2(screenWidth, screenHeight));
+
+  BacksideIrradiance = t.r + t.g*10 + t.b*100;
+  
+  vec3 lightDir = (vec3(0, 0, 0) - lightPos);
+  Backside = (lightPos + (lightDir * BacksideIrradiance));
+  //Backside = texture(shadowmapTexture, shadowmapCoords).xyz*10;
+}