C++ MDrawContext::getViewportDimensions方法代码示例

void
UsdMayaGLBatchRenderer::Draw(
    const MHWRender::MDrawContext& context,
    const MUserData *userData)
{
    // VP 2.0 Implementation
    //
    MHWRender::MRenderer* theRenderer = MHWRender::MRenderer::theRenderer();
    if( !theRenderer || !theRenderer->drawAPIIsOpenGL() )
        return;

    const _BatchDrawUserData* batchData = static_cast<const _BatchDrawUserData*>(userData);
    if( !batchData )
        return;
    
    MStatus status;

    MMatrix projectionMat = context.getMatrix(MHWRender::MDrawContext::kProjectionMtx, &status);
    
    if( batchData->_bounds )
    {
        MMatrix worldViewMat = context.getMatrix(MHWRender::MDrawContext::kWorldViewMtx, &status);

        px_vp20Utils::RenderBoundingBox(*(batchData->_bounds),
                                        *(batchData->_wireframeColor),
                                        worldViewMat,
                                        projectionMat);
    }
    
    if( batchData->_drawShape && !_renderQueue.empty() )
    {
        MMatrix viewMat = context.getMatrix(MHWRender::MDrawContext::kViewMtx, &status);

        // Extract camera settings from maya view
        int viewX, viewY, viewWidth, viewHeight;
        context.getViewportDimensions(viewX, viewY, viewWidth, viewHeight);
        GfVec4d viewport(viewX, viewY, viewWidth, viewHeight);

        // Only the first call to this will do anything... After that the batch
        // queue is cleared.
        //
        _RenderBatches( &context, viewMat, projectionMat, viewport );
    }
}

MStatus viewRenderUserOperation::execute( const MHWRender::MDrawContext & drawContext )
{
	// Sample code to debug pass information
	static const bool debugPassInformation = false;
	if (debugPassInformation)
	{
		const MHWRender::MPassContext & passCtx = drawContext.getPassContext();
		const MString & passId = passCtx.passIdentifier();
		const MStringArray & passSem = passCtx.passSemantics();
		printf("viewRenderUserOperation: drawing in pass[%s], semantic[", passId.asChar());
		for (unsigned int i=0; i<passSem.length(); i++)
			printf(" %s", passSem[i].asChar());
		printf("\n");
	}

	// Example code to find the active override.
	// This is not necessary if the operations just keep a reference
	// to the override, but this demonstrates how this
	// contextual information can be extracted.
	//
	MHWRender::MRenderer *theRenderer = MHWRender::MRenderer::theRenderer();
	const MHWRender::MRenderOverride *overridePtr = NULL;
	if (theRenderer)
	{
		const MString & overrideName = theRenderer->activeRenderOverride();
		overridePtr = theRenderer->findRenderOverride( overrideName );
	}

	// Some sample code to debug lighting information in the MDrawContext
	//
	if (fDebugLightingInfo)
	{
		viewRenderOverrideUtilities::printDrawContextLightInfo( drawContext );
	}

	// Some sample code to debug other MDrawContext information
	//
	if (fDebugDrawContext)
	{
		MStatus status;
		MMatrix matrix = drawContext.getMatrix(MHWRender::MFrameContext::kWorldMtx, &status);
		double dest[4][4];
		status = matrix.get(dest);
		printf("World matrix is:\n");
		printf("\t%f, %f, %f, %f\n", dest[0][0], dest[0][1], dest[0][2], dest[0][3]);
		printf("\t%f, %f, %f, %f\n", dest[1][0], dest[1][1], dest[1][2], dest[1][3]);
		printf("\t%f, %f, %f, %f\n", dest[2][0], dest[2][1], dest[2][2], dest[2][3]);
		printf("\t%f, %f, %f, %f\n", dest[3][0], dest[3][1], dest[3][2], dest[3][3]);

		MDoubleArray viewDirection = drawContext.getTuple(MHWRender::MFrameContext::kViewDirection, &status);
		printf("Viewdirection is: %f, %f, %f\n", viewDirection[0], viewDirection[1], viewDirection[2]);

		MBoundingBox box = drawContext.getSceneBox(&status);
		printf("Screen box is:\n");
		printf("\twidth=%f, height=%f, depth=%f\n", box.width(), box.height(), box.depth());
		float center[4];
		box.center().get(center);
		printf("\tcenter=(%f, %f, %f, %f)\n", center[0], center[1], center[2], center[3]);


		int originX, originY, width, height;
		status = drawContext.getViewportDimensions(originX, originY, width, height);
		printf("Viewport dimension: center(%d, %d), width=%d, heigh=%d\n", originX, originY, width, height);
	}

	//  Draw some addition things for scene draw
	//
	M3dView mView;
	if (mPanelName.length() &&
		(M3dView::getM3dViewFromModelPanel(mPanelName, mView) == MStatus::kSuccess))
	{
		// Get the current viewport and scale it relative to that
		//
		int targetW, targetH;
		drawContext.getRenderTargetSize( targetW, targetH );

		if (fDrawLabel)
		{
			MString testString("Drawing with override: ");
			testString += overridePtr->name();
			MPoint pos(0.0,0.0,0.0);
			glColor3f( 1.0f, 1.0f, 1.0f );
			mView.drawText( testString, pos);
		}

		// Some user drawing of scene bounding boxes
		//
		if (fDrawBoundingBoxes)
		{
			MDagPath cameraPath;
			mView.getCamera( cameraPath);
			MCustomSceneDraw userDraw;
			userDraw.draw( cameraPath, targetW, targetH );
		}
	}
	return MStatus::kSuccess;
}

void UsdMayaGLHdRenderer::RenderVp2(
    const RequestDataArray &requests,
    const MHWRender::MDrawContext& context,
    UsdImagingGLRenderParams params) const
{
    using namespace MHWRender;

    MStatus status;
    MHWRender::MRenderer* theRenderer = MHWRender::MRenderer::theRenderer();
    if (!theRenderer) return;

    MHWRender::MStateManager* stateMgr = context.getStateManager();
    if (!stateMgr) return;

    const int displayStyle = context.getDisplayStyle();
    if (displayStyle == 0) return;

    if (displayStyle & MDrawContext::kXray) {
        // Viewport 2.0 will call draw() twice when drawing transparent objects
        // (X-Ray mode). We skip the first draw() call.
        const MRasterizerState* rasterState = stateMgr->getRasterizerState();
        if (rasterState && rasterState->desc().cullMode == MRasterizerState::kCullFront) {
            return;
        }
    }

    if (!theRenderer->drawAPIIsOpenGL()) return;


    glPushAttrib(GL_CURRENT_BIT | GL_LIGHTING_BIT);

    const MMatrix worldView =
        context.getMatrix(MHWRender::MDrawContext::kWorldViewMtx, &status);
    GfMatrix4d modelViewMatrix(worldView.matrix);

    const MMatrix projection =
        context.getMatrix(MHWRender::MDrawContext::kProjectionMtx, &status);
    GfMatrix4d projectionMatrix(projection.matrix);

    // get root matrix
    MMatrix root = context.getMatrix(MHWRender::MDrawContext::kWorldMtx, &status);
    GfMatrix4d rootMatrix(root.matrix);

    // Extract camera settings from maya view
    int viewX, viewY, viewWidth, viewHeight;
    context.getViewportDimensions(viewX, viewY, viewWidth, viewHeight);

    GfVec4d viewport(viewX, viewY, viewWidth, viewHeight);

    M3dView::DisplayStyle viewDisplayStyle = displayStyle & MDrawContext::kWireFrame ?
        M3dView::kWireFrame : M3dView::kGouraudShaded;

    if(viewDisplayStyle == M3dView::kGouraudShaded)
    {
        px_vp20Utils::setupLightingGL(context);
        glEnable(GL_LIGHTING);
    }

    _renderer->SetCameraState(modelViewMatrix, projectionMatrix, viewport);

    _renderer->SetLightingStateFromOpenGL();


    TF_FOR_ALL(it, requests) {
        RequestData request = *it;
        if(viewDisplayStyle == M3dView::kWireFrame && request.drawRequest.displayStyle() == M3dView::kGouraudShaded) {
            request.drawRequest.setDisplayStyle(viewDisplayStyle);
        }

        switch(request.drawRequest.token()) {
        case UsdMayaGLHdRenderer::DRAW_WIREFRAME:
        case UsdMayaGLHdRenderer::DRAW_POINTS: {

            params.drawMode = request.drawRequest.token() == 
                UsdMayaGLHdRenderer::DRAW_WIREFRAME ? 
                    UsdImagingGLDrawMode::DRAW_WIREFRAME :
                    UsdImagingGLDrawMode::DRAW_POINTS;
            params.enableLighting = false;
            params.cullStyle = UsdImagingGLCullStyle::CULL_STYLE_NOTHING;

            params.overrideColor = request.fWireframeColor;

            // Get and render usdPrim
            _renderer->Render(_renderedPrim, params);

            break;
        }
        case UsdMayaGLHdRenderer::DRAW_SHADED_FLAT:
        case UsdMayaGLHdRenderer::DRAW_SHADED_SMOOTH: {


            params.drawMode = ((request.drawRequest.token() == 
                    UsdMayaGLHdRenderer::DRAW_SHADED_FLAT) ?
                        UsdImagingGLDrawMode::DRAW_GEOM_FLAT : 
                        UsdImagingGLDrawMode::DRAW_GEOM_SMOOTH);
            params.enableLighting = true;
            params.cullStyle = 
                UsdImagingGLCullStyle::CULL_STYLE_BACK_UNLESS_DOUBLE_SIDED;

            _renderer->Render(_renderedPrim, params);
//.........这里部分代码省略.........