add framebuffer support for old video cards

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

View File

@ -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);
}

View File

@ -44,6 +44,7 @@ public:
private:
TexturePtr m_texture;
TexturePtr m_screenBackup;
uint m_fbo;
bool m_fallbackOldImp;
};

View File

@ -132,7 +132,8 @@ void Graphics::endRender()
void Graphics::drawTexturedRect(const Rect& screenCoords,
const TexturePtr& texture,
const Rect& textureCoords)
const Rect& textureCoords,
bool upsideDown)
{
if(screenCoords.isEmpty() || texture->getId() == 0)
return;
@ -151,13 +152,23 @@ void Graphics::drawTexturedRect(const Rect& screenCoords,
if(textureCoords.isEmpty()) {
textureRight = texture->getWidth() / (float)textureSize.width();
if(upsideDown) {
textureBottom = 0.0f;
textureTop = texture->getHeight() / (float)textureSize.height();
} else {
textureBottom = texture->getHeight() / (float)textureSize.height();
textureTop = 0.0f;
}
textureLeft = 0.0f;
} else {
textureRight = (textureCoords.right() + 1) / (float)textureSize.width();
if(upsideDown) {
textureTop = (textureCoords.bottom() + 1) / (float)textureSize.height();
textureBottom = textureCoords.top() / (float)textureSize.height();
} else {
textureBottom = (textureCoords.bottom() + 1) / (float)textureSize.height();
textureTop = textureCoords.top() / (float)textureSize.height();
}
textureLeft = textureCoords.left() / (float)textureSize.width();
}

View File

@ -56,7 +56,8 @@ public:
// drawing API
void drawTexturedRect(const Rect& screenCoords,
const TexturePtr& texture,
const Rect& textureCoords = Rect());
const Rect& textureCoords = Rect(),
bool upsideDown = false);
void drawRepeatedTexturedRect(const Rect& screenCoords,
const TexturePtr& texture,