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out vec4 fragOut0;
in vec4 fragTexCoord;
uniform sampler2D tex;
const float TapSize = 1.0;
layout (std140) uniform genericData {
float texSize;
int level;
};
// Gaussian Blur
// 2 passes required
void main()
{
// Echelon9 - Due to Apple not implementing array constructors in OS X's
// GLSL implementation we need to setup the arrays this way as a workaround
float BlurWeights[6];
BlurWeights[5] = 0.0402;
BlurWeights[4] = 0.0623;
BlurWeights[3] = 0.0877;
BlurWeights[2] = 0.1120;
BlurWeights[1] = 0.1297;
BlurWeights[0] = 0.1362;
vec4 sum = textureLod(tex, fragTexCoord.xy, float(level)) * BlurWeights[0];
#ifdef PASS_0
for (int i = 1; i < 6; i++) {
sum += textureLod(tex, vec2(clamp(fragTexCoord.x - float(i) * (texSize) * TapSize, 0.0, 1.0), fragTexCoord.y), float(level)) * BlurWeights[i];
sum += textureLod(tex, vec2(clamp(fragTexCoord.x + float(i) * (texSize) * TapSize, 0.0, 1.0), fragTexCoord.y), float(level)) * BlurWeights[i];
}
#endif
#ifdef PASS_1
for (int i = 1; i < 6; i++) {
sum += textureLod(tex, vec2(fragTexCoord.x, clamp(fragTexCoord.y - float(i) * (texSize) * TapSize, 0.0, 1.0)), float(level)) * BlurWeights[i];
sum += textureLod(tex, vec2(fragTexCoord.x, clamp(fragTexCoord.y + float(i) * (texSize) * TapSize, 0.0, 1.0)), float(level)) * BlurWeights[i];
}
#endif
fragOut0 = sum;
}
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