Experiment with bloom

shader/texture/bloomBlur.frag

@@ -0,0 +1,57 @@
+#version 430 core
+in vec2 vTexPos;
+out vec4 fColor;
+
+uniform vec2 winSize;
+uniform sampler2D screenTexture;
+
+const float hOff = 2.0 / 600;
+const float vOff = 2.0 / 600;
+const float frac = 1.0 / 9;
+const vec2 off[9] = vec2[]
+    ( vec2( vOff,hOff )
+    , vec2( vOff,0.0 )
+    , vec2( vOff,-hOff )
+    , vec2( 0.0,hOff )
+    , vec2( 0.0,0.0 )
+    , vec2( 0.0,-hOff )
+    , vec2( -vOff,hOff )
+    , vec2( -vOff,0.0 )
+    , vec2( -vOff,-hOff )
+    );
+const vec2 fiveOff[5] = vec2[]
+    ( vec2( vOff,0.0 )
+    , vec2( 0.0,hOff )
+    , vec2( 0.0,0.0 )
+    , vec2( 0.0,-hOff )
+    , vec2( -vOff,0.0 )
+    );
+vec4 combinef (vec4 ac, vec4 bc)
+//{ return vec4 (max(ac.x,bc.x),max(ac.y,bc.y),max(ac.z,bc.z),ac.w + bc.w -
+//        ac.w*bc.w);
+//{ return vec4 (max(ac.x,bc.x),max(ac.y,bc.y),max(ac.z,bc.z),ac.w + bc.w);
+{ return vec4 (ac.rgb + bc.rgb * bc.a , ac.a + bc.a );
+}
+void main()
+{
+    vec4 sampleTex[9];
+    for(int i=0; i<9; i++)
+    {
+        sampleTex[i] = vec4(texture(screenTexture, vTexPos + off[i]));
+    }
+    vec4 col = vec4(0,0,0,0);
+    for (int i = 0; i < 9; i++)
+        col = combinef(col,sampleTex[i]);
+        //col += sampleTex[i] * frac;
+    float alph = 0.0;
+    for (int i = 0; i < 9; i++)
+        alph += sampleTex[i].a;
+    alph = sampleTex[5].a + alph/9.0;
+        //
+    //fColor = col;
+    fColor = vec4(col.rgb/col.a,alph);
+    //if (col.a == 0.0)
+    //{ fColor = vec4(0,0,0,0); }
+    //else
+    //{ fColor = vec4( col.r/col.a , col.g/col.a , col.b/col.a, col.a/9.0); }
+}

shader/texture/bloomBlur.vert

@@ -0,0 +1,9 @@
+#version 430 core
+layout (location = 0) in vec2 pos;
+layout (location = 1) in vec2 texPos;
+out vec2 vTexPos;
+void main()
+{
+  gl_Position = vec4(pos,0,1);
+  vTexPos = texPos;
+}

shader/texture/boxBlur.frag

@@ -19,7 +19,10 @@ const vec2 off[9] = vec2[](
     , vec2( -vOff,0.0 )
     , vec2( -vOff,-hOff )
     );
-
+vec4 combinef (vec4 ac, vec4 bc)
+//{ return vec4 (max(ac.x,bc.x),max(ac.y,bc.y),max(ac.z,bc.z),max(ac.w,bc.w));
+{ return vec4 (max(ac.x,bc.x),max(ac.y,bc.y),max(ac.z,bc.z),ac.w +bc.w*frac);
+}
 void main()
 {
     vec4 sampleTex[9];
@@ -29,6 +32,7 @@ void main()
     }
     vec4 col = vec4(0,0,0,0);
     for (int i = 0; i < 9; i++)
-        col += sampleTex[i] * frac;
+        col = combinef(col,sampleTex[i]);
+        //col += sampleTex[i] * frac;
     fColor = col;
 }