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WinRT: added SDL_LockTexture and SDL_UnlockTexture support to the D3D 11.1 renderer

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This commit is contained in:
David Ludwig 2013-03-31 11:16:31 -04:00
parent b7476a788a
commit da65f35eaf
2 changed files with 97 additions and 5 deletions
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99
src/render/direct3d11/SDL_render_d3d11.cpp
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@ -59,9 +59,9 @@ static int D3D11_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int D3D11_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels,
int pitch);
//static int D3D11_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
// const SDL_Rect * rect, void **pixels, int *pitch);
//static void D3D11_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int D3D11_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch);
static void D3D11_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
//static int D3D11_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture);
static int D3D11_UpdateViewport(SDL_Renderer * renderer);
static int D3D11_RenderClear(SDL_Renderer * renderer);
@ -138,8 +138,8 @@ D3D11_CreateRenderer(SDL_Window * window, Uint32 flags)
renderer->WindowEvent = D3D11_WindowEvent;
renderer->CreateTexture = D3D11_CreateTexture;
renderer->UpdateTexture = D3D11_UpdateTexture;
//renderer->LockTexture = D3D11_LockTexture;
//renderer->UnlockTexture = D3D11_UnlockTexture;
renderer->LockTexture = D3D11_LockTexture;
renderer->UnlockTexture = D3D11_UnlockTexture;
//renderer->SetRenderTarget = D3D11_SetRenderTarget;
renderer->UpdateViewport = D3D11_UpdateViewport;
renderer->RenderClear = D3D11_RenderClear;
@ -832,6 +832,7 @@ D3D11_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
return -1;
}
textureData->pixelFormat = SDL_AllocFormat(texture->format);
textureData->lockedTexturePosition = XMINT2(0, 0);
texture->driverdata = textureData;
@ -951,6 +952,94 @@ D3D11_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
return 0;
}
static int
D3D11_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch)
{
D3D11_RenderData *rendererData = (D3D11_RenderData *) renderer->driverdata;
D3D11_TextureData *textureData = (D3D11_TextureData *) texture->driverdata;
HRESULT result = S_OK;
if (textureData->stagingTexture) {
SDL_SetError("texture is already locked");
return -1;
}
// Create a 'staging' texture, which will be used to write to a portion
// of the main texture. This is necessary, as Direct3D 11.1 does not
// have the ability to write a CPU-bound pixel buffer to a rectangular
// subrect of a texture. Direct3D 11.1 can, however, write a pixel
// buffer to an entire texture, hence the use of a staging texture.
D3D11_TEXTURE2D_DESC stagingTextureDesc;
textureData->mainTexture->GetDesc(&stagingTextureDesc);
stagingTextureDesc.Width = rect->w;
stagingTextureDesc.Height = rect->h;
stagingTextureDesc.BindFlags = 0;
stagingTextureDesc.MiscFlags = 0;
stagingTextureDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
stagingTextureDesc.Usage = D3D11_USAGE_STAGING;
result = rendererData->d3dDevice->CreateTexture2D(
&stagingTextureDesc,
NULL,
&textureData->stagingTexture);
if (FAILED(result)) {
WIN_SetErrorFromHRESULT(__FUNCTION__ ", Create Staging Texture", result);
return -1;
}
// Get a write-only pointer to data in the staging texture:
D3D11_MAPPED_SUBRESOURCE textureMemory = {0};
result = rendererData->d3dContext->Map(
textureData->stagingTexture.Get(),
D3D11CalcSubresource(0, 0, 0),
D3D11_MAP_WRITE,
0,
&textureMemory
);
if (FAILED(result)) {
WIN_SetErrorFromHRESULT(__FUNCTION__ ", Map Staging Texture", result);
textureData->stagingTexture = nullptr;
return -1;
}
// Make note of where the staging texture will be written to (on a
// call to SDL_UnlockTexture):
textureData->lockedTexturePosition = XMINT2(rect->x, rect->y);
// Make sure the caller has information on the texture's pixel buffer,
// then return:
*pixels = textureMemory.pData;
*pitch = textureMemory.RowPitch;
return 0;
}
static void
D3D11_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
D3D11_RenderData *rendererData = (D3D11_RenderData *) renderer->driverdata;
D3D11_TextureData *textureData = (D3D11_TextureData *) texture->driverdata;
// Commit the pixel buffer's changes back to the staging texture:
rendererData->d3dContext->Unmap(
textureData->stagingTexture.Get(),
0);
// Copy the staging texture's contents back to the main texture:
rendererData->d3dContext->CopySubresourceRegion(
textureData->mainTexture.Get(),
D3D11CalcSubresource(0, 0, 0),
textureData->lockedTexturePosition.x,
textureData->lockedTexturePosition.y,
0,
textureData->stagingTexture.Get(),
D3D11CalcSubresource(0, 0, 0),
NULL);
// Clean up and return:
textureData->stagingTexture = nullptr;
textureData->lockedTexturePosition = XMINT2(0, 0);
}
static int
D3D11_UpdateViewport(SDL_Renderer * renderer)
{