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more graphics optimizations

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* avoid buffers clears
* use scisors testing instead of stencil testing for clipping
* remove stencil buffers
This commit is contained in:
Eduardo Bart
2012-04-04 17:18:24 -03:00
parent 53d56259c7
commit b5a4d31fa7
9 changed files with 35 additions and 45 deletions
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33
src/framework/graphics/graphics.cpp
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@@ -73,10 +73,11 @@ void Graphics::init()
m_useFBO = m_useFBO && (GLEW_ARB_framebuffer_object || GLEW_EXT_framebuffer_object);
m_generateHardwareMipmaps = m_generateHardwareMipmaps; // glGenerateMipmap is supported when framebuffers are
#endif
glEnable(GL_BLEND);
//glClear(GL_ACCUM_BUFFER_BIT);
glClear(GL_COLOR_BUFFER_BIT);
m_emptyTexture = TexturePtr(new Texture);
@@ -110,7 +111,6 @@ bool Graphics::parseOption(const std::string& option)
void Graphics::resize(const Size& size)
{
setViewportSize(size);
//glClear(GL_ACCUM_BUFFER_BIT);
// The projection matrix converts from Painter's coordinate system to GL's coordinate system
// * GL's viewport is 2x2, Painter's is width x height
@@ -134,8 +134,8 @@ void Graphics::resize(const Size& size)
void Graphics::beginRender()
{
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
//glClearColor(0, 0, 0, 1);
//glClear(GL_COLOR_BUFFER_BIT);
}
void Graphics::endRender()
@@ -154,32 +154,13 @@ void Graphics::endRender()
void Graphics::beginClipping(const Rect& clipRect)
{
static uint8 depth = 0;
depth++;
if(depth == 0) {
glClear(GL_STENCIL_BUFFER_BIT);
depth = 1;
}
// setup stencil buffer for writing
glEnable(GL_STENCIL_TEST);
glStencilFunc(GL_ALWAYS, depth, 1);
glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
// draw the clipping area into the stencil buffer
glColorMask(0, 0, 0, 0);
g_painter.drawFilledRect(clipRect);
// set stencil buffer for clipping
glColorMask(1, 1, 1, 1);
glStencilFunc(GL_EQUAL, depth, 0xff);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glEnable(GL_SCISSOR_TEST);
glScissor(clipRect.left(), m_viewportSize.height() - clipRect.bottom() - 1, clipRect.width(), clipRect.height());
}
void Graphics::endClipping()
{
glDisable(GL_STENCIL_TEST);
glDisable(GL_SCISSOR_TEST);
}
void Graphics::setViewportSize(const Size& size)