From c7358e6efc2ff241eb2c49b3a6d455ccfa27ea1a Mon Sep 17 00:00:00 2001
From: Faerbit <faerbit@gmail.com>
Date: Thu, 5 Mar 2015 00:00:31 +0100
Subject: [PATCH] Changed blur of flames to gaussian blur.

---
 data/shader/flame_post.fsh | 31 ++++++++++++++++++++++++++-----
 graphics.cc                |  3 +++
 2 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/data/shader/flame_post.fsh b/data/shader/flame_post.fsh
index ea0bc2a..36c3c00 100644
--- a/data/shader/flame_post.fsh
+++ b/data/shader/flame_post.fsh
@@ -5,17 +5,38 @@ in vec2 vTexCoord;
 uniform sampler2D light_fbo;
 uniform int windowSizeX;
 uniform int windowSizeY;
+uniform bool verticalPass;
 
 out vec4 oColor;
 
-const float lookup_offset = 4.0;
+//const float lookup_offset = 4.0;
+const float stretching = 2.0;
 
 void main() {
     vec4 sum = vec4(0.0);
-    for(float i = -lookup_offset; i<=lookup_offset; i+=1.0) {
-        for(float j = -lookup_offset; j<=lookup_offset; j+=1.0) {
-            sum += texture(light_fbo, vec2(vTexCoord.x + i * 1.0/(windowSizeX/2.0), vTexCoord.y + j * 1.0/(windowSizeY/2.0)))/pow(lookup_offset*2+1, 2.0);
-        }
+    if (verticalPass){
+        float blurSize = 1.0/(float(windowSizeY)/(stretching));
+        sum += texture(light_fbo, vec2(vTexCoord.x - 4.0*blurSize, vTexCoord.y)) * 0.05;
+        sum += texture(light_fbo, vec2(vTexCoord.x - 3.0*blurSize, vTexCoord.y)) * 0.09;
+        sum += texture(light_fbo, vec2(vTexCoord.x - 2.0*blurSize, vTexCoord.y)) * 0.12;
+        sum += texture(light_fbo, vec2(vTexCoord.x - blurSize, vTexCoord.y)) * 0.15;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y)) * 0.16;
+        sum += texture(light_fbo, vec2(vTexCoord.x + blurSize, vTexCoord.y)) * 0.15;
+        sum += texture(light_fbo, vec2(vTexCoord.x + 2.0*blurSize, vTexCoord.y)) * 0.12;
+        sum += texture(light_fbo, vec2(vTexCoord.x + 3.0*blurSize, vTexCoord.y)) * 0.09;
+        sum += texture(light_fbo, vec2(vTexCoord.x + 4.0*blurSize, vTexCoord.y)) * 0.05;
+    }
+    else {
+        float blurSize = 1.0/(float(windowSizeX)/stretching);
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y - 4.0*blurSize)) * 0.05;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y - 3.0*blurSize)) * 0.09;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y - 2.0*blurSize)) * 0.12;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y - blurSize)) * 0.15;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y)) * 0.16;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y + blurSize)) * 0.15;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y + 2.0*blurSize)) * 0.12;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y + 3.0*blurSize)) * 0.09;
+        sum += texture(light_fbo, vec2(vTexCoord.x, vTexCoord.y + 4.0*blurSize)) * 0.05;
     }
     oColor = sum;
 }
diff --git a/graphics.cc b/graphics.cc
index 65dcead..72e8afc 100644
--- a/graphics.cc
+++ b/graphics.cc
@@ -350,6 +350,9 @@ void Graphics::render(double time)
     glDisable(GL_CULL_FACE);
 
     flamePostShader->use();
+    flamePostShader->setUniform("verticalPass", true);
+    fullscreen_quad->render();
+    flamePostShader->setUniform("verticalPass", false);
     fullscreen_quad->render();
 
     glDisable(GL_STENCIL_TEST);