Refactored KERNEL_SIZE define out of convolution shader lib.

This is ugly, but allows to use different kernel sizes, making it useful not just for Gaussian blur (which is slow with large kernel).

examples/postprocessing.html

@@ -187,8 +187,8 @@
                 materialConvolution = new THREE.MeshShaderMaterial( {
 
                     uniforms: convolution_uniforms,
-                    vertex_shader: convolution_shader.vertex_shader,
-                    fragment_shader: convolution_shader.fragment_shader
+                    vertex_shader:   "#define KERNEL_SIZE 25.0\n" + convolution_shader.vertex_shader,
+                    fragment_shader: "#define KERNEL_SIZE 25\n"   + convolution_shader.fragment_shader
 
                 } );
 

src/extras/ShaderUtils.js

@@ -341,7 +341,7 @@ var ShaderUtils = {
 		"varying vec2 vUv;",
 		
 		"uniform vec2 uImageIncrement;",
-		"#define KERNEL_SIZE 25.0",
+		//"#define KERNEL_SIZE 25.0",
 		
 		"void main(void) {",
 		
@@ -359,7 +359,7 @@ var ShaderUtils = {
 		"uniform sampler2D tDiffuse;",
 		"uniform vec2 uImageIncrement;",
 		
-		"#define KERNEL_SIZE 25",
+		//"#define KERNEL_SIZE 25",
 		"uniform float cKernel[KERNEL_SIZE];",
 		
 		"void main(void) {",