/* virtual */
void
Hdx_UnitTestWindow::OnInitializeGL()
{
GlfGlewInit();
GlfRegisterDefaultDebugOutputMessageCallback();
GlfContextCaps::InitInstance();
std::cout << glGetString(GL_VENDOR) << "\n";
std::cout << glGetString(GL_RENDERER) << "\n";
std::cout << glGetString(GL_VERSION) << "\n";
//
// Create an offscreen draw target which is the same size as this
// widget and initialize the unit test with the draw target bound.
//
_drawTarget = GlfDrawTarget::New(GfVec2i(GetWidth(), GetHeight()));
_drawTarget->Bind();
_drawTarget->AddAttachment("color", GL_RGBA, GL_FLOAT, GL_RGBA);
_drawTarget->AddAttachment("depth", GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8,
GL_DEPTH24_STENCIL8);
_unitTest->InitTest();
_drawTarget->Unbind();
}
SdfPath
My_TestGLDrawing::PickScene(int pickX, int pickY,
int * outInstanceIndex,
int * outElementIndex)
{
int width = 128;
int height = 128;
GlfDrawTargetRefPtr drawTarget = GlfDrawTarget::New(GfVec2i(width, height));
drawTarget->Bind();
drawTarget->AddAttachment(
"primId", GL_RGBA, GL_UNSIGNED_BYTE, GL_RGBA8);
drawTarget->AddAttachment(
"instanceId", GL_RGBA, GL_UNSIGNED_BYTE, GL_RGBA8);
drawTarget->AddAttachment(
"elementId", GL_RGBA, GL_UNSIGNED_BYTE, GL_RGBA8);
drawTarget->AddAttachment(
"depth", GL_DEPTH_COMPONENT, GL_FLOAT, GL_DEPTH_COMPONENT32F);
drawTarget->Unbind();
drawTarget->Bind();
GLenum drawBuffers[] = {
GL_COLOR_ATTACHMENT0,
GL_COLOR_ATTACHMENT1,
GL_COLOR_ATTACHMENT2
};
glDrawBuffers(3, drawBuffers);
glEnable(GL_DEPTH_TEST);
GLfloat clearColor[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
glClearBufferfv(GL_COLOR, 0, clearColor);
glClearBufferfv(GL_COLOR, 1, clearColor);
GLfloat clearDepth[1] = { 1.0f };
glClearBufferfv(GL_DEPTH, 0, clearDepth);
PickParam pickParam;
pickParam.location = GfVec2d(pickX, pickY);
pickParam.viewport = GfVec4d(0, 0, width, height);
DrawScene(&pickParam);
drawTarget->Unbind();
GLubyte primId[width*height*4];
glBindTexture(GL_TEXTURE_2D,
drawTarget->GetAttachments().at("primId")->GetGlTextureName());
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, primId);
GLubyte instanceId[width*height*4];
glBindTexture(GL_TEXTURE_2D,
drawTarget->GetAttachments().at("instanceId")->GetGlTextureName());
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, instanceId);
GLubyte elementId[width*height*4];
glBindTexture(GL_TEXTURE_2D,
drawTarget->GetAttachments().at("elementId")->GetGlTextureName());
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, elementId);
GLfloat depths[width*height];
glBindTexture(GL_TEXTURE_2D,
drawTarget->GetAttachments().at("depth")->GetGlTextureName());
glGetTexImage(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, GL_FLOAT, depths);
double zMin = 1.0;
int zMinIndex = -1;
for (int y=0, i=0; y<height; y++) {
for (int x=0; x<width; x++, i++) {
if (depths[i] < zMin) {
zMin = depths[i];
zMinIndex = i;
}
}
}
bool didHit = (zMin < 1.0);
SdfPath result;
if (didHit) {
int idIndex = zMinIndex*4;
result = _delegate->GetRenderIndex().GetRprimPathFromPrimId(
HdxRenderSetupTask::DecodeIDRenderColor(&primId[idIndex]));
if (outInstanceIndex) {
*outInstanceIndex = HdxRenderSetupTask::DecodeIDRenderColor(
&instanceId[idIndex]);
}
if (outElementIndex) {
*outElementIndex = HdxRenderSetupTask::DecodeIDRenderColor(
&elementId[idIndex]);
}
}
return result;
}
