hwApiTextureTest/hwRendererHelper.cpp

#include "hwRendererHelper.h"
#include "hwApiTextureTestStrings.h"

#include <maya/MViewport2Renderer.h>
#include <maya/MTextureManager.h>
#include <maya/MRenderTargetManager.h>
#include <maya/MGlobal.h>

#include "hwRendererHelperGL.h"

#ifdef _WIN32
#include "hwRendererHelperDX.h"
#endif

hwRendererHelper::hwRendererHelper(MHWRender::MRenderer* renderer)
: fRenderer(renderer)
{
}

hwRendererHelper::~hwRendererHelper()
{
}

/*static*/
hwRendererHelper* hwRendererHelper::create(MHWRender::MRenderer* renderer)
{
    hwRendererHelper* helper = NULL;

    if(renderer->drawAPIIsOpenGL())
    {
        helper = new hwRendererHelperGL(renderer);
    }
#ifdef _WIN32
    else
    {
        ID3D11Device* dxDevice = (ID3D11Device*) renderer->GPUDeviceHandle();
        helper = new hwRendererHelperDX(renderer, dxDevice);
    }
#endif

    return helper;
}

MHWRender::MTexture* hwRendererHelper::createTextureFromScreen()
{
    const MHWRender::MRenderTargetManager* targetManager = fRenderer->getRenderTargetManager();
    if(targetManager == NULL)
    {
        MGlobal::displayWarning( hwApiTextureTestStrings::getString( hwApiTextureTestStrings::kErrorTargetManager ) );
        return NULL;
    }

    MHWRender::MTextureManager* textureManager = fRenderer->getTextureManager();
    if(textureManager == NULL)
    {
        MGlobal::displayWarning( hwApiTextureTestStrings::getString( hwApiTextureTestStrings::kErrorTextureManager ) );
        return NULL;
    }

    // Acquire a render target initialized with current on-screen target (size, format and data)
    MHWRender::MRenderTarget* onScreenRenderTarget = targetManager->acquireRenderTargetFromScreen( MString("hwApiTextureTest") );
    if(onScreenRenderTarget == NULL)
    {
        MGlobal::displayWarning( hwApiTextureTestStrings::getString( hwApiTextureTestStrings::kErrorSaveGrabArg ) );
        return NULL;
    }

    MHWRender::MRenderTargetDescription targetDesc;
    onScreenRenderTarget->targetDescription(targetDesc);

    // Get the render target data (the screen pixels)
    int rowPitch = 0;
    size_t slicePitch = 0;
    char* targetData = (char*)onScreenRenderTarget->rawData(rowPitch, slicePitch);

    targetManager->releaseRenderTarget(onScreenRenderTarget);

    // Create a texture with same size and format as the render target
    MHWRender::MTexture* texture = NULL;
    if(targetData != NULL)
    {
        MHWRender::MTextureDescription textureDesc;
        textureDesc.fWidth = targetDesc.width();
        textureDesc.fHeight = targetDesc.height();
        textureDesc.fDepth = 1;
        textureDesc.fBytesPerRow = rowPitch;
        textureDesc.fBytesPerSlice = slicePitch;
        textureDesc.fMipmaps = 1;
        textureDesc.fArraySlices = targetDesc.arraySliceCount();
        textureDesc.fFormat = targetDesc.rasterFormat();
        textureDesc.fTextureType = MHWRender::kImage2D;
        textureDesc.fEnvMapType = MHWRender::kEnvNone;

        // Construct the texture with the screen pixels
        texture = textureManager->acquireTexture( MString("hwApiTextureTest"), textureDesc, targetData );
        delete targetData;
    }

    return texture;
}

bool hwRendererHelper::renderTextureToScreen(MHWRender::MTexture* texture)
{
    const MHWRender::MRenderTargetManager* targetManager = fRenderer->getRenderTargetManager();
    if(targetManager == NULL)
    {
        //MGlobal::displayWarning( hwApiTextureTestStrings::getString( hwApiTextureTestStrings::kErrorTargetManager ) );
        return false;
    }

    MHWRender::MTextureDescription textureDesc;
    texture->textureDescription(textureDesc);

    MHWRender::MRenderTargetDescription targetDesc(
        MString("hwApiTextureTest"),
        textureDesc.fWidth,
        textureDesc.fHeight,
        1 /*multiSampleCount*/,
        textureDesc.fFormat,
        textureDesc.fArraySlices,
        false /*isCubeMap*/);

    // Create a render target with same size and format as texture
    MHWRender::MRenderTarget* renderTarget = targetManager->acquireRenderTarget( targetDesc );
    if(renderTarget == NULL)
        return false;

    bool result = false;

    // Render texture to target
    if( renderTextureToTarget(texture, renderTarget) )
    {
        // Copy target to screen
        result = fRenderer->copyTargetToScreen( renderTarget );
    }

    targetManager->releaseRenderTarget(renderTarget);

    return result;
}

//-
// Copyright 2012 Autodesk, Inc.  All rights reserved.
//
// Use of this software is subject to the terms of the Autodesk license agreement
// provided at the time of installation or download, or which otherwise
// accompanies this software in either electronic or hard copy form.
//+