void OpenGLRenderable::initializeGLRenderable(bool pAllowAliasing)
{
static bool sMakingCurrent = false;
CG_GL_ERROR_CHECK
if(!sMakingCurrent)
{
sMakingCurrent = true;
if(!makeGLContextCurrent())
{
printf("Error: could not enable current context (%s:%d).\n", __FILE__, __LINE__);
fflush(stdout);
}
sMakingCurrent = false;
}
// Basic OpenGL setup
glClearColor(0.0, 0.0, 0.0, 0.0);
glEnable(GL_TEXTURE_2D);
mAllowAliasing = pAllowAliasing;
if(!mAllowAliasing) glEnable(GL_MULTISAMPLE);
else glDisable(GL_MULTISAMPLE);
if(!mOrtho2D) glEnable(GL_DEPTH_TEST);
CG_GL_ERROR_CHECK
}
void OpenGLRenderable::initializeGLRenderable(bool pAllowAliasing)
{
static bool sMakingCurrent = false;
CG_GL_ERROR_CHECK
if(!sMakingCurrent)
{
sMakingCurrent = true;
if(!makeGLContextCurrent())
{
printf("Error: could not enable current context (%s:%d).\n", __FILE__, __LINE__);
fflush(stdout);
}
sMakingCurrent = false;
}
/* EDIT: GLEW support is disabled for now, may bring back later
// Initialize GLEW
static GLenum err = glewInit();
if(err != GLEW_OK) fprintf(stderr, "Error: %s\n", glewGetErrorString(err));
*/
// Basic OpenGL setup
glClearColor(0.0, 0.0, 0.0, 0.0);
glEnable(GL_TEXTURE_2D);
mAllowAliasing = pAllowAliasing;
if(!mAllowAliasing) glEnable(GL_MULTISAMPLE);
else glDisable(GL_MULTISAMPLE);
if(!mOrtho2D) glEnable(GL_DEPTH_TEST);
CG_GL_ERROR_CHECK
}
void StelQGLRenderer::renderFrame(StelRenderClient& renderClient)
{
invariant();
recentFrames.update();
clearFrameStatistics();
if(previousFrameEndTime < 0.0)
{
previousFrameEndTime = StelApp::getTotalRunTime();
}
viewport.setDefaultPainter(renderClient.getPainter(), glContext);
makeGLContextCurrent();
viewport.startFrame();
// When using the GUI, try to have the best reactivity,
// even if we need to lower the FPS.
const int minFps = StelApp::getInstance().getGui()->isCurrentlyUsed() ? 16 : 2;
glClearColor(0, 0, 0, 0);
glClear(GL_COLOR_BUFFER_BIT);
while (true)
{
const bool doneDrawing = !renderClient.drawPartial();
if(doneDrawing)
{
viewport.finishFrame();
break;
}
const double spentTime = StelApp::getTotalRunTime() - previousFrameEndTime;
// We need FBOs to do partial drawing.
if (viewport.useFBO() && 1.0 / spentTime <= minFps)
{
// We stop the painting operation for now
viewport.suspendFrame();
break;
}
}
drawWindow(renderClient.getViewportEffect());
viewport.setDefaultPainter(NULL, glContext);
// Flushing GL commands helps FPS somewhat (not sure why, though)
glFlush();
previousFrameEndTime = StelApp::getTotalRunTime();
invariant();
}
void GL3DShaderWidget::paintGL()
{
// If it's not yet visible don't try and draw (you can upset OpenGL on some systems if you do)
if(!isVisible()) return;
CG_GL_ERROR_CHECK
// Make sure this OpenGL context is current
#ifdef GLCONTEXT_DEBUG
fprintf(stderr, "Making current (%s:%d)\n", __FILE__, __LINE__);
fflush(stderr);
#endif
makeGLContextCurrent();
CG_GL_ERROR_CHECK
// Clear the buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
CG_GL_ERROR_CHECK
// Allow special processing before drawContents() (implement in child)
// Note: buffer clears before but not after, shader is not bound
if(mShader != NULL) mShader->release();
CG_GL_ERROR_CHECK
prePaint();
CG_GL_ERROR_CHECK
// Bind the shader and draw the maincontents
if(mShader != NULL) mShader->bind();
else glColor4f(0.0, 0.0, 0.0, 1.0);
drawContents();
CG_GL_ERROR_CHECK
// Allow special procesing after drawContents() but before buffer swap (implement in child)
// Note: shader is not bound
if(mShader != NULL) mShader->release();
postPaintPreSwap();
CG_GL_ERROR_CHECK
// Swap back and front buffers
// NO! Qt does this automatically and doing it manually will cause a
// double swap on some OSs and seisure inducing flashing.
// swapBuffers();
}
