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Remove PaintClipper from OpenGL Scene rendering

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Construct window quads which will end on the screen instead of
rendering the windows several times and using scissoring to
restrict to the area which will end on screen.

REVIEW: 101765
This commit is contained in:
Martin Gräßlin 2011-06-26 12:01:13 +02:00
parent bb8b92f93d
commit cd82616ece
2 changed files with 49 additions and 28 deletions
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34
libkwineffects/kwinglutils.cpp
View file

@ -1073,9 +1073,9 @@ GLVertexBuffer *GLVertexBufferPrivate::streamingBuffer = NULL;
void GLVertexBufferPrivate::legacyPainting(QRegion region, GLenum primitiveMode)
{
#ifdef KWIN_HAVE_OPENGLES
Q_UNUSED(region)
Q_UNUSED(primitiveMode)
#else
Q_UNUSED(region)
// Enable arrays
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(dimension, GL_FLOAT, 0, legacyVertices.constData());
@ -1088,15 +1088,7 @@ void GLVertexBufferPrivate::legacyPainting(QRegion region, GLenum primitiveMode)
glColor4f(color.redF(), color.greenF(), color.blueF(), color.alphaF());
}
// Clip using scissoring
if (region != infiniteRegion()) {
PaintClipper pc(region);
for (PaintClipper::Iterator iterator; !iterator.isDone(); iterator.next()) {
glDrawArrays(primitiveMode, 0, numberVertices);
}
} else {
glDrawArrays(primitiveMode, 0, numberVertices);
}
glDrawArrays(primitiveMode, 0, numberVertices);
glDisableClientState(GL_VERTEX_ARRAY);
if (!legacyTexCoords.isEmpty()) {
@ -1107,6 +1099,7 @@ void GLVertexBufferPrivate::legacyPainting(QRegion region, GLenum primitiveMode)
void GLVertexBufferPrivate::corePainting(const QRegion& region, GLenum primitiveMode)
{
Q_UNUSED(region)
GLShader *shader = ShaderManager::instance()->getBoundShader();
GLint vertexAttrib = shader->attributeLocation("vertex");
GLint texAttrib = shader->attributeLocation("texCoord");
@ -1128,15 +1121,7 @@ void GLVertexBufferPrivate::corePainting(const QRegion& region, GLenum primitive
glVertexAttribPointer(texAttrib, 2, GL_FLOAT, GL_FALSE, 0, 0);
}
// Clip using scissoring
if (region != infiniteRegion()) {
PaintClipper pc(region);
for (PaintClipper::Iterator iterator; !iterator.isDone(); iterator.next()) {
glDrawArrays(primitiveMode, 0, numberVertices);
}
} else {
glDrawArrays(primitiveMode, 0, numberVertices);
}
glDrawArrays(primitiveMode, 0, numberVertices);
glBindBuffer(GL_ARRAY_BUFFER, 0);
@ -1149,9 +1134,9 @@ void GLVertexBufferPrivate::corePainting(const QRegion& region, GLenum primitive
void GLVertexBufferPrivate::fallbackPainting(const QRegion& region, GLenum primitiveMode)
{
#ifdef KWIN_HAVE_OPENGLES
Q_UNUSED(region)
Q_UNUSED(primitiveMode)
#else
Q_UNUSED(region)
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glBindBuffer(GL_ARRAY_BUFFER, buffers[ 0 ]);
@ -1165,14 +1150,7 @@ void GLVertexBufferPrivate::fallbackPainting(const QRegion& region, GLenum primi
}
// Clip using scissoring
if (region != infiniteRegion()) {
PaintClipper pc(region);
for (PaintClipper::Iterator iterator; !iterator.isDone(); iterator.next()) {
glDrawArrays(primitiveMode, 0, numberVertices);
}
} else {
glDrawArrays(primitiveMode, 0, numberVertices);
}
glDrawArrays(primitiveMode, 0, numberVertices);
glBindBuffer(GL_ARRAY_BUFFER, 0);

43
scene_opengl.cpp
View file

@ -476,6 +476,49 @@ void SceneOpenGL::Window::performPaint(int mask, QRegion region, WindowPaintData
if (region.isEmpty())
return;
if (region != infiniteRegion() && !(mask & PAINT_WINDOW_TRANSFORMED)) {
WindowQuadList quads;
const QRegion filterRegion = region.translated(-x(), -y());
const QRectF bounding = QRectF(filterRegion.boundingRect());
// first step: split all quads according to the bounding rect
foreach (const WindowQuad &quad, data.quads) {
const QRectF quadRect(QPointF(quad.left(), quad.top()), QPointF(quad.right(), quad.bottom()));
// case 1: completely contains
if (bounding.contains(quadRect)) {
quads << quad;
continue;
}
// case 2: intersection
if (bounding.intersects(quadRect)) {
const QRectF intersected = bounding.intersected(quadRect);
quads << quad.makeSubQuad(intersected.left(), intersected.top(), intersected.right(), intersected.bottom());
}
}
if (filterRegion.numRects() > 1) {
// second step: split all quads in bounding rect with the actual rects in the region
WindowQuadList tempList;
foreach (const WindowQuad &quad, quads) {
foreach (const QRect &r, filterRegion.rects()) {
const QRectF rf(r);
const QRectF quadRect(QPointF(quad.left(), quad.top()), QPointF(quad.right(), quad.bottom()));
// case 1: completely contains, include and do not check other rects
if (rf.contains(quadRect)) {
tempList << quad;
break;
}
// case 2: intersection
if (rf.intersects(quadRect)) {
const QRectF intersected = rf.intersected(quadRect);
tempList << quad.makeSubQuad(intersected.left(), intersected.top(), intersected.right(), intersected.bottom());
}
}
}
data.quads = tempList;
} else {
data.quads = quads;
}
}
if (!bindTexture())
return;