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Add a 17 tap blur filter

Browse Source 
and use it for SSAO
This commit is contained in:
vlj
2014-05-12 20:49:47 +02:00
parent 967d7a0316
commit bba9e3ca2c
7 changed files with 161 additions and 1 deletions
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38
data/shaders/gaussian17taph.frag Normal file
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@@ -0,0 +1,38 @@
// From http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/
uniform sampler2D tex;
uniform vec2 pixel;
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];
}
FragColor = sum;
}

38
data/shaders/gaussian17tapv.frag Normal file
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@@ -0,0 +1,38 @@
// From http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/
uniform sampler2D tex;
uniform vec2 pixel;
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];
}
FragColor = sum;
}

33
src/graphics/post_processing.cpp
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@@ -383,6 +383,39 @@ void PostProcessing::renderGaussian6Blur(GLuint in_fbo, GLuint in_tex, GLuint tm
}
}
void PostProcessing::renderGaussian17TapBlur(unsigned in_fbo, unsigned in_tex, unsigned tmp_fbo, unsigned tmp_tex, size_t width, size_t height)
{
float inv_width = 1.f / width, inv_height = 1.f / height;
{
glBindFramebuffer(GL_FRAMEBUFFER, tmp_fbo);
glUseProgram(FullScreenShader::Gaussian17TapHShader::Program);
glBindVertexArray(FullScreenShader::Gaussian17TapHShader::vao);
glUniform2f(FullScreenShader::Gaussian17TapHShader::uniform_pixel, inv_width, inv_height);
setTexture(0, in_tex, GL_LINEAR, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glUniform1i(FullScreenShader::Gaussian17TapHShader::uniform_tex, 0);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
{
glBindFramebuffer(GL_FRAMEBUFFER, in_fbo);
glUseProgram(FullScreenShader::Gaussian17TapVShader::Program);
glBindVertexArray(FullScreenShader::Gaussian17TapVShader::vao);
glUniform2f(FullScreenShader::Gaussian17TapVShader::uniform_pixel, inv_width, inv_height);
setTexture(0, tmp_tex, GL_LINEAR, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glUniform1i(FullScreenShader::Gaussian17TapVShader::uniform_tex, 0);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}
}
void PostProcessing::renderPassThrough(GLuint tex)
{

1
src/graphics/post_processing.hpp
View File

@@ -84,6 +84,7 @@ public:
/** Blur the in texture */
void renderGaussian3Blur(unsigned in_fbo, unsigned in_tex, unsigned tmp_fbo, unsigned tmp_tex, size_t inv_width, size_t inv_height);
void renderGaussian6Blur(unsigned in_fbo, unsigned in_tex, unsigned tmp_fbo, unsigned tmp_tex, size_t width, size_t height);
void renderGaussian17TapBlur(unsigned in_fbo, unsigned in_tex, unsigned tmp_fbo, unsigned tmp_tex, size_t width, size_t height);
/** Render tex. Used for blit/texture resize */
void renderPassThrough(unsigned tex);

2
src/graphics/render.cpp
View File

@@ -898,7 +898,7 @@ void IrrDriver::renderSSAO()
glViewport(0, 0, UserConfigParams::m_width, UserConfigParams::m_height);
m_post_processing->renderSSAO();
// Blur it to reduce noise.
m_post_processing->renderGaussian6Blur(irr_driver->getFBO(FBO_SSAO), irr_driver->getRenderTargetTexture(RTT_SSAO),
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);
glViewport(0, 0, UserConfigParams::m_width, UserConfigParams::m_height);
}

30
src/graphics/shaders.cpp
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@@ -301,8 +301,10 @@ void Shaders::loadShaders()
FullScreenShader::DepthOfFieldShader::init();
FullScreenShader::ColorLevelShader::init();
FullScreenShader::FogShader::init();
FullScreenShader::Gaussian17TapHShader::init();
FullScreenShader::Gaussian3HBlurShader::init();
FullScreenShader::Gaussian3VBlurShader::init();
FullScreenShader::Gaussian17TapVShader::init();
FullScreenShader::Gaussian6HBlurShader::init();
FullScreenShader::Gaussian6VBlurShader::init();
FullScreenShader::PenumbraHShader::init();
@@ -2349,6 +2351,20 @@ namespace FullScreenShader
glUniform1i(uniform_shadowtex, TU_shadowtex);
}
GLuint Gaussian17TapHShader::Program;
GLuint Gaussian17TapHShader::uniform_tex;
GLuint Gaussian17TapHShader::uniform_pixel;
GLuint Gaussian17TapHShader::vao;
void Gaussian17TapHShader::init()
{
Program = LoadProgram(
GL_VERTEX_SHADER, file_manager->getAsset("shaders/screenquad.vert").c_str(),
GL_FRAGMENT_SHADER, file_manager->getAsset("shaders/gaussian17taph.frag").c_str());
uniform_tex = glGetUniformLocation(Program, "tex");
uniform_pixel = glGetUniformLocation(Program, "pixel");
vao = createVAO(Program);
}
GLuint Gaussian6HBlurShader::Program;
GLuint Gaussian6HBlurShader::uniform_tex;
GLuint Gaussian6HBlurShader::uniform_pixel;
@@ -2377,6 +2393,20 @@ namespace FullScreenShader
vao = createVAO(Program);
}
GLuint Gaussian17TapVShader::Program;
GLuint Gaussian17TapVShader::uniform_tex;
GLuint Gaussian17TapVShader::uniform_pixel;
GLuint Gaussian17TapVShader::vao;
void Gaussian17TapVShader::init()
{
Program = LoadProgram(
GL_VERTEX_SHADER, file_manager->getAsset("shaders/screenquad.vert").c_str(),
GL_FRAGMENT_SHADER, file_manager->getAsset("shaders/gaussian17tapv.frag").c_str());
uniform_tex = glGetUniformLocation(Program, "tex");
uniform_pixel = glGetUniformLocation(Program, "pixel");
vao = createVAO(Program);
}
GLuint Gaussian6VBlurShader::Program;
GLuint Gaussian6VBlurShader::uniform_tex;
GLuint Gaussian6VBlurShader::uniform_pixel;

20
src/graphics/shaders.hpp
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@@ -610,6 +610,16 @@ public:
static void setUniforms(const core::vector3df &direction, float r, float g, float b, unsigned TU_ntex, unsigned TU_dtex, unsigned TU_shadowtex);
};
class Gaussian17TapHShader
{
public:
static GLuint Program;
static GLuint uniform_tex, uniform_pixel;
static GLuint vao;
static void init();
};
class Gaussian6HBlurShader
{
public:
@@ -630,6 +640,16 @@ public:
static void init();
};
class Gaussian17TapVShader
{
public:
static GLuint Program;
static GLuint uniform_tex, uniform_pixel;
static GLuint vao;
static void init();
};
class Gaussian6VBlurShader
{
public: