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kwin: adding a proper clipping to the lanczosfilter

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This commit is contained in:
Philipp Knechtges 2012-03-24 12:44:35 +01:00
parent 05a8777edf
commit 8e8212b0ef
1 changed files with 17 additions and 4 deletions
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21
lanczosfilter.cpp
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@ -191,6 +191,7 @@ void LanczosFilter::performPaint(EffectWindowImpl* w, int mask, QRegion region,
int tw = width * data.xScale;
int th = height * data.yScale;
const QRect textureRect(tx, ty, tw, th);
const bool hardwareClipping = !(QRegion(textureRect)-region).isEmpty();
int sw = width;
int sh = height;
@ -199,6 +200,9 @@ void LanczosFilter::performPaint(EffectWindowImpl* w, int mask, QRegion region,
if (cachedTexture) {
if (cachedTexture->width() == tw && cachedTexture->height() == th) {
cachedTexture->bind();
if (hardwareClipping) {
glEnable(GL_SCISSOR_TEST);
}
if (ShaderManager::instance()->isValid()) {
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@ -212,15 +216,18 @@ void LanczosFilter::performPaint(EffectWindowImpl* w, int mask, QRegion region,
shader->setUniform(GLShader::Saturation, data.saturation);
shader->setUniform(GLShader::AlphaToOne, 0);
cachedTexture->render(textureRect, textureRect);
cachedTexture->render(region, textureRect, hardwareClipping);
ShaderManager::instance()->popShader();
glDisable(GL_BLEND);
} else {
prepareRenderStates(cachedTexture, data.opacity, data.brightness, data.saturation);
cachedTexture->render(textureRect, textureRect);
cachedTexture->render(region, textureRect, hardwareClipping);
restoreRenderStates(cachedTexture, data.opacity, data.brightness, data.saturation);
}
if (hardwareClipping) {
glDisable(GL_SCISSOR_TEST);
}
cachedTexture->unbind();
m_timer.start(5000, this);
return;
@ -330,6 +337,9 @@ void LanczosFilter::performPaint(EffectWindowImpl* w, int mask, QRegion region,
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, m_offscreenTex->height() - th, tw, th);
GLRenderTarget::popRenderTarget();
if (hardwareClipping) {
glEnable(GL_SCISSOR_TEST);
}
if (ShaderManager::instance()->isValid()) {
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@ -343,15 +353,18 @@ void LanczosFilter::performPaint(EffectWindowImpl* w, int mask, QRegion region,
shader->setUniform(GLShader::Saturation, data.saturation);
shader->setUniform(GLShader::AlphaToOne, 0);
cache->render(textureRect, textureRect);
cache->render(region, textureRect, hardwareClipping);
ShaderManager::instance()->popShader();
glDisable(GL_BLEND);
} else {
prepareRenderStates(cache, data.opacity, data.brightness, data.saturation);
cache->render(textureRect, textureRect);
cache->render(region, textureRect, hardwareClipping);
restoreRenderStates(cache, data.opacity, data.brightness, data.saturation);
}
if (hardwareClipping) {
glDisable(GL_SCISSOR_TEST);
}
cache->unbind();
w->setData(LanczosCacheRole, QVariant::fromValue(static_cast<void*>(cache)));