GameManipTutorial/code.cpp at master · PeterTh/GameManipTutorial · GitHub

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HRESULTWrappedID3D11Device::CreateTexture2D(constD3D11_TEXTURE2D_DESC *pDesc,
constD3D11_SUBRESOURCE_DATA *pInitialData,
 ID3D11Texture2D **ppTexture2D) {
staticUINT resW = 2560; // horizontal resolution, should be automatically determined
staticfloat resFactor = resW / 1600.0f; // the factor required to scale to the largest part of the pyramid

// R11G11B10 float textures of these sizes are part of the BLOOM PYRAMID
// Note: we do not manipulate the 50x28 buffer
// -- it's read by a compute shader and the whole screen white level can be off if it is the wrong size
if(pDesc->Format == DXGI_FORMAT_R11G11B10_FLOAT) {
if((pDesc->Width == 800 && pDesc->Height == 450)
 || (pDesc->Width == 400 && pDesc->Height == 225)
 || (pDesc->Width == 200 && pDesc->Height == 112)
 || (pDesc->Width == 100 && pDesc->Height == 56)
/*|| (pDesc->Width == 50 && pDesc->Height == 28)*/) {
D3D11_TEXTURE2D_DESC copy = *pDesc;
// Scale the upper parts of the pyramid fully
// and lower levels progressively less
float pyramidLevelFactor = (pDesc->Width - 50) / 750.0f;
float scalingFactor = 1.0f + (resFactor - 1.0f)*pyramidLevelFactor;
 copy.Width = (UINT)(copy.Width*scalingFactor);
 copy.Height = (UINT)(copy.Height*scalingFactor);
 pDesc = &copy;
 }
 }

staticUINT aoW = 1280;
staticUINT aoH = 720;

// 800x450 R8G8B8A8_UNORM is the buffer used to store the AO result and subsequently blur it
// 800x450 R32_FLOAT is used to store hierarchical Z information (individual mipmap levels are rendered to)
// and serves as input to the main AO pass
// 800x450 D24_UNORM_S8_UINT depth/stencil used together with R8G8B8A8_UNORM buffer for something (unclear) later on
if(pDesc->Format == DXGI_FORMAT_R8G8B8A8_UNORM || pDesc->Format == DXGI_FORMAT_R32_FLOAT || pDesc->Format == DXGI_FORMAT_D24_UNORM_S8_UINT) {
if(pDesc->Width == 800 && pDesc->Height == 450) {
// set to our display resolution instead
D3D11_TEXTURE2D_DESC copy = *pDesc;
 copy.Width = aoW;
 copy.Height = aoH;
 pDesc = &copy;
 }
 }

// [...]
}

/////////////////////////////////////////

// High level description:
// IF we have
// - 1 viewport
// - with the size of one of the 4 elements of the pyramid or mip levels of the AO-related buffers we changed
// - and a primary rendertarget of type R11G11B10, R8G8B8A8_UNORM, or R32_FLOAT
// - which is associated with a texture of a size different from the viewport
// THEN
// - set the viewport to the texture size, or a farction of that if targeting a mipmap
// - adjust the pixel shader constant buffer in the right slot for the current operation
voidPreDraw(WrappedID3D11DeviceContext* context) {
UINT numViewports = 0;
 context->RSGetViewports(&numViewports, NULL);
if(numViewports == 1) {
D3D11_VIEWPORT vp;
 context->RSGetViewports(&numViewports, &vp);

if((vp.Width == 800 && vp.Height == 450)
 || (vp.Width == 400 && vp.Height == 225)
 || (vp.Width == 200 && vp.Height == 112)
 || (vp.Width == 100 && vp.Height == 56)
 || (vp.Width == 50 && vp.Height == 28)
 || (vp.Width == 25 && vp.Height == 14)) {

 ID3D11RenderTargetView *rtView = NULL;
 context->OMGetRenderTargets(1, &rtView, NULL);
if(rtView) {
D3D11_RENDER_TARGET_VIEW_DESC desc;
 rtView->GetDesc(&desc);
if(desc.Format == DXGI_FORMAT_R11G11B10_FLOAT || desc.Format == DXGI_FORMAT_R8G8B8A8_UNORM || desc.Format == DXGI_FORMAT_R32_FLOAT) {
 ID3D11Resource *rt = NULL;
 rtView->GetResource(&rt);
if(rt) {
 ID3D11Texture2D *rttex = NULL;
 rt->QueryInterface<ID3D11Texture2D>(&rttex);
if(rttex) {
D3D11_TEXTURE2D_DESC texdesc;
 rttex->GetDesc(&texdesc);
if(texdesc.Width != vp.Width) {
// Here we go!
// Viewport is the easy part
 vp.Width = (float)texdesc.Width;
 vp.Height = (float)texdesc.Height;
// if we are at mip slice N, divide by 2^N
if(desc.Texture2D.MipSlice > 0) {
 vp.Width = (float)(texdesc.Width >> desc.Texture2D.MipSlice);
 vp.Height = (float)(texdesc.Height >> desc.Texture2D.MipSlice);
 }
 context->RSSetViewports(1, &vp);

// The constant buffer is a bit more difficult
// We don't want to create a new buffer every frame,
// but we also can't use the game's because they are read-only
// this just-in-time initialized map is a rather ugly solution,
// but it works as long as the game only renders from 1 thread (which it does)
// NOTE: rather than storing them statically here (basically a global) the lifetime should probably be managed
D3D11_BUFFER_DESC buffdesc;
 buffdesc.ByteWidth = 16;
 buffdesc.Usage = D3D11_USAGE_IMMUTABLE;
 buffdesc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
 buffdesc.CPUAccessFlags = 0;
 buffdesc.MiscFlags = 0;
 buffdesc.StructureByteStride = 16;
D3D11_SUBRESOURCE_DATA initialdata;
 ID3D11Buffer* replacementbuffer = NULL;
 ID3D11Device* dev = NULL;

// If we are not rendering to a mip map for hierarchical Z, the format is
// [ 0.5f / W, 0.5f / H, W, H ] (half-pixel size and total dimensions)
if(desc.Texture2D.MipSlice == 0) {
static std::map<UINT, ID3D11Buffer*> buffers;
auto iter = buffers.find(texdesc.Width);
if(iter == buffers.cend()) {
float constants[4] = {0.5f / vp.Width, 0.5f / vp.Height, (float)vp.Width, (float)vp.Height};
 context->GetDevice(&dev);
 initialdata.pSysMem = constants;
 dev->CreateBuffer(&buffdesc, &initialdata, &replacementbuffer);
 buffers[texdesc.Width] = replacementbuffer;
 }
 context->PSSetConstantBuffers(12, 1, &buffers[texdesc.Width]);
 }
// For hierarchical Z mips, the format is
// [ W, H, LOD (Mip-1), 0.0f ]
else {
static std::map<UINT, ID3D11Buffer*> mipBuffers;
auto iter = mipBuffers.find(desc.Texture2D.MipSlice);
if(iter == mipBuffers.cend()) {
float constants[4] = {vp.Width, vp.Height, (float)desc.Texture2D.MipSlice - 1, 0.0f};
 context->GetDevice(&dev);
 initialdata.pSysMem = constants;
 dev->CreateBuffer(&buffdesc, &initialdata, &replacementbuffer);
 mipBuffers[desc.Texture2D.MipSlice] = replacementbuffer;
 }
 context->PSSetConstantBuffers(8, 1, &mipBuffers[desc.Texture2D.MipSlice]);
 }
if(dev) dev->Release();
 }
 }
 rt->Release();
 }
 }
 rtView->Release();
 }
 }
 }
}

voidWrappedID3D11DeviceContext::DrawIndexed(UINT IndexCount, UINT StartIndexLocation,
INT BaseVertexLocation) {
if(IndexCount == 4 && StartIndexLocation == 0 && BaseVertexLocation == 0) PreDraw(this);

// [...]
}

voidWrappedID3D11DeviceContext::Draw(UINT VertexCount, UINT StartVertexLocation) {
if(VertexCount == 4 && StartVertexLocation == 0) PreDraw(this);

// [...]
}