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Use exp algorithm for the gaussian blur

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This commit is contained in:
Vincent Lejeune 2014-11-02 02:35:02 +01:00
parent 042817a760
commit 7679213e26
2 changed files with 30 additions and 16 deletions
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23
data/shaders/gaussian6h.frag
View File

@ -1,6 +1,8 @@
uniform sampler2D tex;
uniform vec2 pixel;
float sigma = 1.;
// Gaussian separated blur with radius 6.
out vec4 FragColor;
@ -8,17 +10,22 @@ out vec4 FragColor;
void main()
{
vec2 uv = gl_FragCoord.xy * pixel;
vec4 sum = vec4(0.0);
float X = uv.x;
float Y = uv.y;
sum += texture(tex, vec2(X - 5.13333 * pixel.x, Y)) * 0.00640869;
sum += texture(tex, vec2(X - 3.26667 * pixel.x, Y)) * 0.083313;
sum += texture(tex, vec2(X - 1.4 * pixel.x, Y)) * 0.305481;
sum += texture(tex, vec2(X, Y)) * 0.209473;
sum += texture(tex, vec2(X + 1.4 * pixel.x, Y)) * 0.305481;
sum += texture(tex, vec2(X + 3.26667 * pixel.x, Y)) * 0.083313;
sum += texture(tex, vec2(X + 5.13333 * pixel.x, Y)) * 0.00640869;
float g0, g1, g2;
g0 = 1.0 / (sqrt(2.0 * 3.14) * sigma);
g1 = exp(-0.5 / (sigma * sigma));
g2 = g1 * g1;
vec4 sum = texture(tex, vec2(X, Y)) * g0;
g0 *= g1;
g1 *= g2;
for (int i = 1; i < 3; i++) {
sum += texture(tex, vec2(X - i * pixel.x, Y)) * g0;
sum += texture(tex, vec2(X + i * pixel.x, Y)) * g0;
g0 *= g1;
g1 *= g2;
}
FragColor = sum;
}

23
data/shaders/gaussian6v.frag
View File

@ -1,6 +1,8 @@
uniform sampler2D tex;
uniform vec2 pixel;
float sigma = 1.;
// Gaussian separated blur with radius 6.
out vec4 FragColor;
@ -8,17 +10,22 @@ out vec4 FragColor;
void main()
{
vec2 uv = gl_FragCoord.xy * pixel;
vec4 sum = vec4(0.0);
float X = uv.x;
float Y = uv.y;
sum += texture(tex, vec2(X, Y - 5.13333 * pixel.y)) * 0.00640869;
sum += texture(tex, vec2(X, Y - 3.26667 * pixel.y)) * 0.083313;
sum += texture(tex, vec2(X, Y - 1.4 * pixel.y)) * 0.305481;
sum += texture(tex, vec2(X, Y)) * 0.209473;
sum += texture(tex, vec2(X, Y + 1.4 * pixel.y)) * 0.305481;
sum += texture(tex, vec2(X, Y + 3.26667 * pixel.y)) * 0.083313;
sum += texture(tex, vec2(X, Y + 5.13333 * pixel.y)) * 0.00640869;
float g0, g1, g2;
g0 = 1.0 / (sqrt(2.0 * 3.14) * sigma);
g1 = exp(-0.5 / (sigma * sigma));
g2 = g1 * g1;
vec4 sum = texture(tex, vec2(X, Y)) * g0;
g0 *= g1;
g1 *= g2;
for (int i = 1; i < 3; i++) {
sum += texture(tex, vec2(X, Y - i * pixel.y)) * g0;
sum += texture(tex, vec2(X, Y + i * pixel.y)) * g0;
g0 *= g1;
g1 *= g2;
}
FragColor = sum;
}