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SSAO: Stronger blur + tweak param

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Use another algorithm to have gaussian blur that lets us customise
radius more easily.
This commit is contained in:
vlj 2014-05-12 23:59:17 +02:00
parent bba9e3ca2c
commit 26d48cdad0
4 changed files with 32 additions and 45 deletions
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35
data/shaders/gaussian17taph.frag
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@ -1,37 +1,30 @@
// From http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/
// From http://http.developer.nvidia.com/GPUGems3/gpugems3_ch40.html
uniform sampler2D tex;
uniform vec2 pixel;
uniform float sigma = 5.;
in vec2 uv;
out vec4 FragColor;
void main()
{
float X = uv.x;
float Y = uv.y;
float offset[5] = {
0.,
1.41176470588235,
3.29411764705882,
5.17647058823529,
7.05882352941176
};
float weight[5] = {
0.196380615234375,
0.1888427734375,
0.03631591796875,
0.0020751953125,
0.000015258789062
};
vec4 sum = texture(tex, vec2(X, Y)) * weight[0];
for (int i = 1; i < 5; i++) {
sum += texture(tex, vec2(X - offset[i] * pixel.x, Y)) * weight[i];
sum += texture(tex, vec2(X + offset[i] * pixel.x, Y)) * weight[i];
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 < 9; 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;

36
data/shaders/gaussian17tapv.frag
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@ -1,38 +1,32 @@
// From http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/
// From http://http.developer.nvidia.com/GPUGems3/gpugems3_ch40.html
uniform sampler2D tex;
uniform vec2 pixel;
uniform float sigma = 5.;
in vec2 uv;
out vec4 FragColor;
void main()
{
float X = uv.x;
float Y = uv.y;
float offset[5] = {
0.,
1.41176470588235,
3.29411764705882,
5.17647058823529,
7.05882352941176
};
float weight[5] = {
0.196380615234375,
0.1888427734375,
0.03631591796875,
0.0020751953125,
0.000015258789062
};
vec4 sum = texture(tex, vec2(X, Y)) * weight[0];
for (int i = 1; i < 5; i++) {
sum += texture(tex, vec2(X, Y - offset[i] * pixel.y)) * weight[i];
sum += texture(tex, vec2(X, Y + offset[i] * pixel.y)) * weight[i];
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 < 9; 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;
}

4
data/shaders/ssao.frag
View File

@ -27,10 +27,10 @@ in vec2 uv;
out float AO;
const float sigma = 1.;
const float tau = 2.;
const float tau = 7.;
const float beta = 0.0001;
const float epsilon = .00001;
const float radius = 1.;
const float radius = 1.5;
const float k = 1.;
#define SAMPLES 16

2
src/graphics/render.cpp
View File

@ -899,7 +899,7 @@ void IrrDriver::renderSSAO()
m_post_processing->renderSSAO();
// Blur it to reduce noise.
m_post_processing->renderGaussian17TapBlur(irr_driver->getFBO(FBO_SSAO), irr_driver->getRenderTargetTexture(RTT_SSAO),
irr_driver->getFBO(FBO_TMP4), irr_driver->getRenderTargetTexture(RTT_TMP4), UserConfigParams::m_width, UserConfigParams::m_height);
irr_driver->getFBO(FBO_TMP4), irr_driver->getRenderTargetTexture(RTT_TMP4), UserConfigParams::m_width, UserConfigParams::m_height );
glViewport(0, 0, UserConfigParams::m_width, UserConfigParams::m_height);
}