void drawSceneToTarget()
{
if (!targetTexture_ ||
targetTexture_->getWidth() != 2 * window_->getWidth() ||
targetTexture_->getHeight() != 2 * window_->getHeight())
{
targetTexture_ = window_->getContext()->createTexture();
targetTexture_->setSize(2 * window_->getWidth(),
2 * window_->getHeight());
targetTexture_->setMinFilter(GL_LINEAR);
targetTexture_->setMagFilter(GL_LINEAR);
targetFrameBuffer_ = window_->getContext()->createFrameBuffer();
targetFrameBuffer_->setColorAttachment(targetTexture_);
}
targetFrameBuffer_->create();
glViewport(0, 0, window_->getWidth() * 2,
window_->getHeight() * 2);
glBindFramebuffer(GL_FRAMEBUFFER, targetFrameBuffer_->getName());
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
drawScene();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glViewport(0, 0, window_->getWidth(), window_->getHeight());
}
void drawLogoToTarget()
{
logoTexture_->create();
targetFrameBuffer_->create();
glViewport(0, 0, targetTexture_->getWidth(),
targetTexture_->getHeight());
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
float aspectRatio = (float(logoTexture_->getWidth()) /
float(logoTexture_->getHeight()));
float scale = 0.2f;
glBindFramebuffer(GL_FRAMEBUFFER, targetFrameBuffer_->getName());
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, logoTexture_->getName());
glPushMatrix();
glRotatef(angle_, 0.0f, 0.0f, 1.0f);
glColor3f(1.0f, 0.8f, 0.2f);
glBegin(GL_QUADS);
{
glTexCoord2i(0, 0);
glVertex2f(-scale * aspectRatio, -scale);
glTexCoord2i(1, 0);
glVertex2f(scale * aspectRatio, -scale);
glTexCoord2i(1, 1);
glVertex2f(scale * aspectRatio, scale);
glTexCoord2i(0, 1);
glVertex2f(-scale * aspectRatio, scale);
}
glEnd();
glPopMatrix();
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}