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improve GLVertexBuffer::render function

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add a new function fallbackPainting to GLVertexBufferPrivate class
replace the hard-coded index values for vertex and texCoords attributes in corePainting

Reviewed by: Martin Gräßlin <mgraesslin@kde.org>
This commit is contained in:
Jammy Zhou 2011-02-14 14:38:56 +08:00
parent 096691db01
commit 6eb24bf374
1 changed files with 48 additions and 38 deletions
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86
lib/kwinglutils.cpp
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@ -1529,8 +1529,12 @@ public:
bool useTexCoords;
QColor color;
//! VBO is not supported
void legacyPainting(QRegion region, GLenum primitiveMode);
//! VBO and shaders are both supported
void corePainting(const QRegion& region, GLenum primitiveMode);
//! VBO is supported, but shaders are not supported
void fallbackPainting(const QRegion& region, GLenum primitiveMode);
};
bool GLVertexBufferPrivate::supported = false;
GLVertexBuffer *GLVertexBufferPrivate::streamingBuffer = NULL;
@ -1572,15 +1576,15 @@ void GLVertexBufferPrivate::legacyPainting(QRegion region, GLenum primitiveMode)
void GLVertexBufferPrivate::corePainting(const QRegion& region, GLenum primitiveMode)
{
glEnableVertexAttribArray(0);
if (useTexCoords) {
glEnableVertexAttribArray(1);
}
GLShader *shader = ShaderManager::instance()->getBoundShader();
GLint vertexAttrib = shader->attributeLocation("vertex");
GLint texAttrib = shader->attributeLocation("texCoord");
glEnableVertexAttribArray(vertexAttrib);
if (useTexCoords) {
glEnableVertexAttribArray(texAttrib);
}
if (useColor) {
shader->setUniform("geometryColor", color);
}
@ -1606,9 +1610,44 @@ void GLVertexBufferPrivate::corePainting(const QRegion& region, GLenum primitive
glBindBuffer(GL_ARRAY_BUFFER, 0);
if (useTexCoords) {
glDisableVertexAttribArray(1);
glDisableVertexAttribArray(texAttrib);
}
glDisableVertexAttribArray(0);
glDisableVertexAttribArray(vertexAttrib);
}
void GLVertexBufferPrivate::fallbackPainting(const QRegion& region, GLenum primitiveMode)
{
#ifdef KWIN_HAVE_OPENGLES
Q_UNUSED(region)
Q_UNUSED(primitiveMode)
#else
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glBindBuffer(GL_ARRAY_BUFFER, buffers[ 0 ]);
glVertexPointer(dimension, GL_FLOAT, 0, 0);
glBindBuffer(GL_ARRAY_BUFFER, buffers[ 1 ]);
glTexCoordPointer(2, GL_FLOAT, 0, 0);
if (useColor) {
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);
}
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
#endif
}
//*********************************
@ -1681,40 +1720,11 @@ void GLVertexBuffer::render(const QRegion& region, GLenum primitiveMode)
{
if (!GLVertexBufferPrivate::supported) {
d->legacyPainting(region, primitiveMode);
return;
}
if (ShaderManager::instance()->isShaderBound()) {
} else if (ShaderManager::instance()->isShaderBound()) {
d->corePainting(region, primitiveMode);
return;
}
#ifndef KWIN_HAVE_OPENGLES
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glBindBuffer(GL_ARRAY_BUFFER, d->buffers[ 0 ]);
glVertexPointer(d->dimension, GL_FLOAT, 0, 0);
glBindBuffer(GL_ARRAY_BUFFER, d->buffers[ 1 ]);
glTexCoordPointer(2, GL_FLOAT, 0, 0);
if (d->useColor) {
glColor4f(d->color.redF(), d->color.greenF(), d->color.blueF(), d->color.alphaF());
}
// Clip using scissoring
if (region != infiniteRegion()) {
PaintClipper pc(region);
for (PaintClipper::Iterator iterator; !iterator.isDone(); iterator.next()) {
glDrawArrays(primitiveMode, 0, d->numberVertices);
}
} else {
glDrawArrays(primitiveMode, 0, d->numberVertices);
d->fallbackPainting(region, primitiveMode);
}
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
#endif
}
bool GLVertexBuffer::isSupported()