void TestTransferFunctionColorWidget::initWithTestData()
{
vtkImageDataPtr dummyImageData = cx::Image::createDummyImageData(2, 1);
cx::ImagePtr dummyImage(new cx::Image("DummyImage", dummyImageData));
cx::ImageTFDataPtr transferFunction;
transferFunction = dummyImage->getTransferFunctions3D();
this->setData(dummyImage, transferFunction);
}
StelQGLTextureBackend* StelQGLTextureBackend::fromViewport
(StelQGLRenderer* renderer, const QSize viewportSize, const QGLFormat& viewportFormat)
{
// This function should only be used as a fallback for when FBOs aren't supported.
const int r = viewportFormat.redBufferSize();
const int g = viewportFormat.greenBufferSize();
const int b = viewportFormat.blueBufferSize();
const int a = viewportFormat.alpha() ? viewportFormat.alphaBufferSize() : 0;
// Creating a texture from a dummy image.
QImage dummyImage(64, 64, QImage::Format_Mono);
const TextureParams params = TextureParams();
StelQGLTextureBackend* result =
new StelQGLTextureBackend(renderer, QString(), params);
// Get image and GL pixel format matching viewport format.
int glFormat;
if(r == 8 && g == 8 && b == 8 && a == 8)
{
glFormat = GL_RGBA8;
result->pixelBytes = 4.0f;
}
else if(r == 8 && g == 8 && b == 8 && a == 0)
{
glFormat = GL_RGB8;
result->pixelBytes = 3.0f;
}
else if(r == 5 && g == 6 && b == 5 && a == 0)
{
glFormat = GL_RGB5;
result->pixelBytes = 2.0f;
}
else
{
// This is extremely unlikely, but we can't rule it out.
Q_ASSERT_X(false, Q_FUNC_INFO,
"Unknown screen vertex format when getting texture from viewport. "
"Switching to OpenGL2, disabling viewport effects or "
"chaning video mode bit depth might help");
// Invalid value to avoid warnings.
glFormat = -1;
}
QGLContext* context = result->prepareContextForLoading();
const GLuint glTextureID =
context->bindTexture(dummyImage, GL_TEXTURE_2D, glFormat,
getTextureBindOptions(params));
// Need a power-of-two texture (as this is used mainly with GL1)
const QSize size =
StelUtils::smallestPowerOfTwoSizeGreaterOrEqualTo(viewportSize);
// Set viewport so it matches the size of the texture
glViewport(0, 0, size.width(), size.height());
// Copy viewport to texture (this overrides texture size - we must use POT for GL1)
glCopyTexImage2D(GL_TEXTURE_2D, 0, glFormat, 0, 0, size.width(), size.height(), 0);
// Restore viewport
glViewport(0, 0, viewportSize.width(), viewportSize.height());
// Will need change if different screen bit depths are ever supported
renderer->getStatistics()[ESTIMATED_TEXTURE_MEMORY]
+= size.width() * size.height() * result->pixelBytes;
result->startedLoading();
result->glTextureID = glTextureID;
result->finishedLoading(size);
return result;
}
