shader does work at least...

assets/blur.frag

@@ -1,73 +1,12 @@
 #ifdef GL_ES
-#define LOWP lowp
-precision mediump float;
-#else
-#define LOWP
+    precision mediump float;
 #endif
 
 varying vec4 v_color;
 varying vec2 v_texCoords;
 uniform sampler2D u_texture;
 
-varying vec4 vertexWorldPos;
-uniform vec4 backColor;
-
-uniform float width;
-uniform float height;
 void main() {
-    vec2 tex;
-    vec4 color2=vec4(0.0,0.0,0.0,0);
-
-    float stepx=(1.0/width)*4.0;
-    float stepy=(1.0/height)*4.0;
-    vec4 color;
-
-    tex.x=v_texCoords.x+stepx;
-    tex.y=v_texCoords.y+stepy;
-    color=v_color * texture2D(u_texture, tex);
-    color2.r+=color.r;
-    color2.g+=color.g;
-    color2.b+=color.b;
-    color2.a+=color.a;
-
-    tex.x=v_texCoords.x-stepx;
-    tex.y=v_texCoords.y+stepy;
-    color=v_color * texture2D(u_texture, tex);
-    color2.r+=color.r;
-    color2.g+=color.g;
-    color2.b+=color.b;
-    color2.a+=color.a;
-
-    tex.x=v_texCoords.x-stepx;
-    tex.y=v_texCoords.y-stepy;
-    color=v_color * texture2D(u_texture, tex);
-    color2.r+=color.r;
-    color2.g+=color.g;
-    color2.b+=color.b;
-    color2.a+=color.a;
-
-    tex.x=v_texCoords.x+stepx;
-    tex.y=v_texCoords.y-stepy;
-    color=v_color * texture2D(u_texture, tex);
-    color2.r+=color.r;
-    color2.g+=color.g;
-    color2.b+=color.b;
-    color2.a+=color.a;
-
-    tex.x=v_texCoords.x;
-    tex.y=v_texCoords.y;
-    color=v_color * texture2D(u_texture, tex);
-    color2.r+=color.r;
-    color2.g+=color.g;
-    color2.b+=color.b;
-    color2.a+=color.a;
-
-    color2.r/=5.0;
-    color2.g/=5.0;
-    color2.b/=5.0;
-    color2.a/=5.0;
-
-
-    gl_FragColor = color2;
-
+    //gl_FragColor = v_color * texture2D(u_texture, v_texCoords);
+    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
 }

assets/blur.vert

@@ -1,7 +1,14 @@
-precision mediump float;
+attribute vec4 a_position;
+attribute vec4 a_color;
+attribute vec2 a_texCoord0;
 
-attribute vec2 position;
+uniform mat4 u_projTrans;
+
+varying vec4 v_color;
+varying vec2 v_texCoords;
 
 void main() {
-  gl_Position = vec4(position, 1, 1);
+    v_color = a_color;
+    v_texCoords = a_texCoord0;
+    gl_Position = u_projTrans * a_position;
 }

src/net/torvald/terrarum/StateInGameGDX.kt

@@ -402,10 +402,12 @@ class StateInGameGDX(val batch: SpriteBatch) : Screen {
         // now the actual drawing part //
         lightmapFrameBuffer.inAction {
             // TODO gaussian blur p=8
-            TerrarumGDX.shaderBlur.setUniformf("width", lightmapFrameBuffer.width.toFloat())
-            TerrarumGDX.shaderBlur.setUniformf("height", lightmapFrameBuffer.height.toFloat())
+
+            batch.shader = TerrarumGDX.shaderBlur
             batch.inUse {
-                batch.shader = null//TerrarumGDX.shaderBlur
+                //batch.shader.setUniform3fv("iResolution", floatArrayOf(lightmapFrameBuffer.width.toFloat(), lightmapFrameBuffer.height.toFloat(), 0f), 0, 12)
+                //batch.shader.setUniformi("iChannel0", 0)
+                //batch.shader.setUniform2fv("direction", floatArrayOf(8f, 8f), 0, 8)
 
 
                 // using custom code for camera; this is obscure and tricky