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Fewer texture lookups when diffusing.

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This commit is contained in:
Andrzej Kapolka 2013-08-20 17:02:35 -07:00
parent 49da612a4e
commit 590672d035
3 changed files with 16 additions and 10 deletions
interface
resources/shaders
diffuse.frag
src/renderer
GlowEffect.cppGlowEffect.h

19
interface/resources/shaders/diffuse.frag
View file

@ -14,15 +14,14 @@ uniform sampler2D originalTexture;
// the texture containing the diffused color
uniform sampler2D diffusedTexture;
// the scale of diffusion
uniform vec2 diffusionScale;
void main(void) {
float ds = dFdx(gl_TexCoord[0].s);
float dt = dFdy(gl_TexCoord[0].t);
gl_FragColor = (texture2D(diffusedTexture, gl_TexCoord[0].st + vec2(-ds, -dt)) +
texture2D(diffusedTexture, gl_TexCoord[0].st + vec2(0.0, -dt)) +
texture2D(diffusedTexture, gl_TexCoord[0].st + vec2(ds, -dt)) +
texture2D(diffusedTexture, gl_TexCoord[0].st + vec2(ds, 0.0)) +
texture2D(diffusedTexture, gl_TexCoord[0].st + vec2(ds, dt)) +
texture2D(diffusedTexture, gl_TexCoord[0].st + vec2(0.0, dt)) +
texture2D(diffusedTexture, gl_TexCoord[0].st + vec2(-ds, dt)) +
texture2D(diffusedTexture, gl_TexCoord[0].st + vec2(-ds, 0.0))) / 8.5 + texture2D(originalTexture, gl_TexCoord[0].st) * 0.1;
vec2 minExtents = gl_TexCoord[0].st + diffusionScale * vec2(-1.5, -1.5);
vec2 maxExtents = gl_TexCoord[0].st + diffusionScale * vec2(1.5, 1.5);
gl_FragColor = (texture2D(diffusedTexture, minExtents) +
texture2D(diffusedTexture, vec2(maxExtents.s, minExtents.t)) +
texture2D(diffusedTexture, vec2(minExtents.s, maxExtents.t)) +
texture2D(diffusedTexture, maxExtents)) / 4.25 + texture2D(originalTexture, gl_TexCoord[0].st) * 0.1;
}

6
interface/src/renderer/GlowEffect.cpp
View file

@ -57,6 +57,8 @@ void GlowEffect::init() {
_diffuseProgram->bind();
_diffuseProgram->setUniformValue("diffusedTexture", 1);
_diffuseProgram->release();
_diffusionScaleLocation = _diffuseProgram->uniformLocation("diffusionScale");
}
void GlowEffect::prepare() {
@ -125,7 +127,11 @@ void GlowEffect::render() {
glBindTexture(GL_TEXTURE_2D, oldDiffusedFBO->texture());
_diffuseProgram->bind();
QSize size = Application::getInstance()->getGLWidget()->size();
_diffuseProgram->setUniformValue(_diffusionScaleLocation, 1.0f / size.width(), 1.0f / size.height());
renderFullscreenQuad();
_diffuseProgram->release();
newDiffusedFBO->release();

1
interface/src/renderer/GlowEffect.h
View file

@ -57,6 +57,7 @@ private:
ProgramObject* _verticalBlurProgram;
ProgramObject* _addSeparateProgram;
ProgramObject* _diffuseProgram;
int _diffusionScaleLocation;
bool _isEmpty; ///< set when nothing in the scene is currently glowing
bool _isOddFrame; ///< controls the alternation between texture targets in diffuse add mode