void
HdxColorCorrectionTask::Execute(HdTaskContext* ctx)
{
HD_TRACE_FUNCTION();
HF_MALLOC_TAG_FUNCTION();
if (!_CreateBufferResources()) {
return;
}
if (!_CreateShaderResources()) {
return;
}
_CreateFramebufferResources(&_texture);
_CopyTexture();
_ApplyColorCorrection();
}
void
HdxCompositor::Draw(GLuint colorId, GLuint depthId, bool remapDepth)
{
// No-op if no color data was specified.
if (colorId == 0) {
return;
}
// Create draw buffers if they haven't been created yet.
if (_vertexBuffer == 0) {
_CreateBufferResources();
}
bool useDepthProgram = (depthId != 0);
// Load the shader if it hasn't been loaded, or we're changing modes.
if (!_compositorProgram || _useDepthProgram != useDepthProgram) {
_CreateShaderResources(useDepthProgram);
_useDepthProgram = useDepthProgram;
}
// No-op if the shader failed to compile.
if (!_compositorProgram) {
return;
}
// A note here: HdxCompositor is used for all of our plugins and has to be
// robust to poor GL support. OSX compatibility profile provides a
// GL 2.1 API, slightly restricting our choice of API and heavily
// restricting our shader syntax.
GLuint programId = _compositorProgram->GetProgram().GetId();
glUseProgram(programId);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, colorId);
glUniform1i(_locations[colorIn], 0);
if (depthId != 0) {
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, depthId);
glUniform1i(_locations[depthIn], 1);
}
glUniform1i(_locations[remapDepthIn], (GLint)remapDepth);
glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
glVertexAttribPointer(_locations[position], 4, GL_FLOAT, GL_FALSE,
sizeof(float)*6, 0);
glEnableVertexAttribArray(_locations[position]);
glVertexAttribPointer(_locations[uvIn], 2, GL_FLOAT, GL_FALSE,
sizeof(float)*6, reinterpret_cast<void*>(sizeof(float)*4));
glEnableVertexAttribArray(_locations[uvIn]);
GLboolean restoreAlphaToCoverage;
glGetBooleanv(GL_SAMPLE_ALPHA_TO_COVERAGE, &restoreAlphaToCoverage);
glDisable(GL_SAMPLE_ALPHA_TO_COVERAGE);
glDrawArrays(GL_TRIANGLES, 0, 3);
if (restoreAlphaToCoverage) {
glEnable(GL_SAMPLE_ALPHA_TO_COVERAGE);
}
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDisableVertexAttribArray(_locations[position]);
glDisableVertexAttribArray(_locations[uvIn]);
glUseProgram(0);
if (depthId != 0) {
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, 0);
}
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, 0);
GLF_POST_PENDING_GL_ERRORS();
}
