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Optimizations for occlusion blur (the main one being that we only need to

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sample the texture four, not sixteen, times if we turn on linear filtering
and sample between the texels).
This commit is contained in:
Andrzej Kapolka 2013-08-20 11:52:43 -07:00
parent 8ded40476e
commit 22598ceb4f
4 changed files with 31 additions and 20 deletions
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19
interface/resources/shaders/occlusion_blur.frag
View file

@ -11,15 +11,14 @@
// the original texture
uniform sampler2D originalTexture;
// the scale for the blur kernel
uniform vec2 blurScale;
void main(void) {
float ds = dFdx(gl_TexCoord[0].s);
float dt = dFdy(gl_TexCoord[0].t);
vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 4; j++) {
sum += texture2D(originalTexture, gl_TexCoord[0].st +
vec2(ds, dt) * vec2(-2.0 + float(i), -2.0 + float(j)));
}
}
gl_FragColor = sum / 16.0;
vec2 minExtents = gl_TexCoord[0].st + blurScale * vec2(-0.5, -0.5);
vec2 maxExtents = gl_TexCoord[0].st + blurScale * vec2(1.5, 1.5);
gl_FragColor = (texture2D(originalTexture, minExtents) +
texture2D(originalTexture, vec2(maxExtents.s, minExtents.t)) +
texture2D(originalTexture, vec2(minExtents.s, maxExtents.t)) +
texture2D(originalTexture, maxExtents)) * 0.25;
}

5
interface/src/renderer/AmbientOcclusionEffect.cpp
View file

@ -112,8 +112,8 @@ void AmbientOcclusionEffect::render() {
_occlusionProgram->setUniformValue(_leftBottomLocation, left, bottom);
_occlusionProgram->setUniformValue(_rightTopLocation, right, top);
QSize size = Application::getInstance()->getGLWidget()->size();
_occlusionProgram->setUniformValue(_noiseScaleLocation, size.width() / (float)ROTATION_WIDTH,
size.height() / (float)ROTATION_HEIGHT);
QVector2D noiseScale(size.width() / (float)ROTATION_WIDTH, size.height() / (float)ROTATION_HEIGHT);
_occlusionProgram->setUniformValue(_noiseScaleLocation, noiseScale);
renderFullscreenQuad();
@ -133,6 +133,7 @@ void AmbientOcclusionEffect::render() {
glBindTexture(GL_TEXTURE_2D, secondaryFBO->texture());
_blurProgram->bind();
_blurProgram->setUniformValue(_blurScaleLocation, 1.0f / size.width(), 1.0f / size.height());
renderFullscreenQuad();

25
interface/src/renderer/TextureCache.cpp
View file

@ -64,12 +64,11 @@ GLuint TextureCache::getPermutationNormalTextureID() {
QOpenGLFramebufferObject* TextureCache::getPrimaryFramebufferObject() {
if (_primaryFramebufferObject == NULL) {
QSize size = Application::getInstance()->getGLWidget()->size();
_primaryFramebufferObject = new QOpenGLFramebufferObject(size);
Application::getInstance()->getGLWidget()->installEventFilter(this);
_primaryFramebufferObject = createFramebufferObject();
glGenTextures(1, &_primaryDepthTextureID);
glBindTexture(GL_TEXTURE_2D, _primaryDepthTextureID);
QSize size = Application::getInstance()->getGLWidget()->size();
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, size.width(), size.height(),
0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
@ -91,16 +90,14 @@ GLuint TextureCache::getPrimaryDepthTextureID() {
QOpenGLFramebufferObject* TextureCache::getSecondaryFramebufferObject() {
if (_secondaryFramebufferObject == NULL) {
_secondaryFramebufferObject = new QOpenGLFramebufferObject(Application::getInstance()->getGLWidget()->size());
Application::getInstance()->getGLWidget()->installEventFilter(this);
_secondaryFramebufferObject = createFramebufferObject();
}
return _secondaryFramebufferObject;
}
QOpenGLFramebufferObject* TextureCache::getTertiaryFramebufferObject() {
if (_tertiaryFramebufferObject == NULL) {
_tertiaryFramebufferObject = new QOpenGLFramebufferObject(Application::getInstance()->getGLWidget()->size());
Application::getInstance()->getGLWidget()->installEventFilter(this);
_tertiaryFramebufferObject = createFramebufferObject();
}
return _tertiaryFramebufferObject;
}
@ -124,3 +121,15 @@ bool TextureCache::eventFilter(QObject* watched, QEvent* event) {
}
return false;
}
QOpenGLFramebufferObject* TextureCache::createFramebufferObject() {
QOpenGLFramebufferObject* fbo = new QOpenGLFramebufferObject(Application::getInstance()->getGLWidget()->size());
Application::getInstance()->getGLWidget()->installEventFilter(this);
glBindTexture(GL_TEXTURE_2D, fbo->texture());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);
return fbo;
}

2
interface/src/renderer/TextureCache.h
View file

@ -46,6 +46,8 @@ public:
private:
QOpenGLFramebufferObject* createFramebufferObject();
GLuint _permutationNormalTextureID;
QOpenGLFramebufferObject* _primaryFramebufferObject;