void StelQGLRenderer::drawWindow(StelViewportEffect* const effect)
{
// At this point, FBOs have been released (if using FBOs), so we're drawing
// directly to the screen. The StelViewportEffect::drawToViewport call
// actually draws puts the rendered result onto the viewport.
invariant();
//Warn about any GL errors.
checkGLErrors("drawWindow() start");
//Effects are ignored when FBO is not supported.
//That might be changed for some GPUs, but it might not be worth the effort.
viewport.prepareToDrawViewport();
if(NULL == effect)
{
// If using FBO, we still need to put it on the screen.
if(viewport.useFBO())
{
StelTextureNew* screenTexture = getViewportTexture();
const QSize size = screenTexture->getDimensions();
glDisable(GL_BLEND);
setGlobalColor(Vec4f(1.0f, 1.0f, 1.0f, 1.0f));
screenTexture->bind();
drawTexturedRect(0, 0, size.width(), size.height());
delete screenTexture;
}
// If not using FBO, the result is already drawn to the screen.
}
else
{
effect->drawToViewport(this);
}
viewport.disablePainting();
checkGLErrors("drawWindow() end");
invariant();
}
void StelViewportDistorterFisheyeToSphericMirror::drawToViewport(StelRenderer* renderer)
{
// Screen texture might be larger than the screen
// if power-of-two textures are required.
// In such cases, we need to adjust texture coordinates
// and do that every time screen size is changed.
StelTextureNew* screenTexture = renderer->getViewportTexture();
const QSize viewportSize = renderer->getViewportSize();
const QSize texSize = screenTexture->getDimensions();
const QSizeF newMaxTexCoords(viewportSize.width() / static_cast<float>(texSize.width()),
viewportSize.height() / static_cast<float>(texSize.height()));
if(maxTexCoords != newMaxTexCoords)
{
recalculateTexCoords(newMaxTexCoords);
}
screenTexture->bind();
foreach(StelIndexBuffer* strip, stripBuffers)
{
renderer->drawVertexBuffer(vertexGrid, strip);
}