In the fragment shader, we apply the Blinn-Phong reflection model in the first pass. In the second pass, we compute the vertical sum. In the third, we compute the horizontal sum:
in vec3 Position; // Vertex position
in vec3 Normal; // Vertex normal uniform int Pass; // Pass numberlayout(binding=0) uniform sampler2D Texture0;
// Light/material uniforms ....layout( location = 0 ) out vec4 FragColor; uniform int PixOffset[5] = int[](0,1,2,3,4); uniform float Weight[5]; vec3 blinnPhong( vec3 pos, vec3 norm ) { // ... } vec4 pass1() { return vec4(blinnPhong( Position, normalize(Normal) ),1.0); } vec4 pass2() { ivec2 pix = ivec2(gl_FragCoord.xy); vec4 sum = texelFetch(Texture0, pix, 0) * Weight[0]; for( int i = 1; i < 5; i++ ) { ...
