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add framebuffer support for old video cards

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This commit is contained in:
Eduardo Bart
2011-11-25 20:29:45 -02:00
parent 7e0618b247
commit 1386064d71
4 changed files with 36 additions and 9 deletions
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20
src/framework/graphics/framebuffer.cpp
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@@ -79,6 +79,9 @@ FrameBuffer::FrameBuffer(int width, int height)
// otherwise fallback to copy texture from screen implementation
m_fallbackOldImp = true;
}
if(m_fallbackOldImp)
logInfo("Framebuffers not supported, falling back to old implementation.");
}
FrameBuffer::~FrameBuffer()
@@ -92,13 +95,23 @@ void FrameBuffer::bind()
if(!m_fallbackOldImp) {
// bind framebuffer
oglBindFramebuffer(GL_FRAMEBUFFER_EXT, m_fbo);
} else {
int screenWidth = g_graphics.getScreenSize().width();
int screenHeight = g_graphics.getScreenSize().height();
if(!m_screenBackup || m_screenBackup->getSize() != g_graphics.getScreenSize())
m_screenBackup = TexturePtr(new Texture(screenWidth, screenHeight, 4));
// save screen state
glBindTexture(GL_TEXTURE_2D, m_screenBackup->getId());
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, screenWidth, screenHeight);
}
// setup framebuffer viewport
glViewport(0, 0, m_texture->getWidth(), m_texture->getHeight());
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0f, m_texture->getWidth(), 0, m_texture->getHeight(), -1, 1);
glOrtho(0.0f, m_texture->getWidth(), m_texture->getHeight(), 0, -1, 1);
// back to model view
glMatrixMode(GL_MODELVIEW);
@@ -127,13 +140,14 @@ void FrameBuffer::unbind()
// restore graphics viewport
g_graphics.restoreViewport();
// clear screen
// restore screen
glClearColor(0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
g_graphics.drawTexturedRect(Rect(Point(0,0), g_graphics.getScreenSize()), m_screenBackup, Rect(), true);
}
}
void FrameBuffer::draw(const Rect& screenCoords, const Rect& framebufferCoords)
{
g_graphics.drawTexturedRect(screenCoords, m_texture, framebufferCoords);
g_graphics.drawTexturedRect(screenCoords, m_texture, framebufferCoords, true);
}