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SDL_winrtrenderer.cpp
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SDL_winrtrenderer.cpp
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#include <fstream>
#include <string>
#include <vector>
#include "SDLmain_WinRT_common.h"
#include "SDL_winrtrenderer.h"
extern "C" {
#include "SDL_syswm.h"
}
using namespace DirectX;
using namespace Microsoft::WRL;
using namespace std;
using namespace Windows::UI::Core;
using namespace Windows::Foundation;
using namespace Windows::Graphics::Display;
extern HRESULT D3D11_CreateDeviceResources(SDL_Renderer * renderer);
extern CoreWindow ^ D3D11_GetCoreWindowFromSDLRenderer(SDL_Renderer * renderer);
extern HRESULT D3D11_CreateWindowSizeDependentResources(SDL_Renderer * renderer);
// Constructor.
SDL_winrtrenderer::SDL_winrtrenderer() :
m_mainTextureHelperSurface(NULL),
m_sdlRenderer(NULL),
m_sdlRendererData(NULL)
{
}
SDL_winrtrenderer::~SDL_winrtrenderer()
{
if (m_mainTextureHelperSurface) {
SDL_FreeSurface(m_mainTextureHelperSurface);
m_mainTextureHelperSurface = NULL;
}
}
// Initialize the Direct3D resources required to run.
void SDL_winrtrenderer::Initialize()
{
CreateDeviceResources();
CreateWindowSizeDependentResources();
}
// Recreate all device resources and set them back to the current state.
void SDL_winrtrenderer::HandleDeviceLost()
{
// Reset these member variables to ensure that UpdateForWindowSizeChange recreates all resources.
m_sdlRendererData->windowSizeInDIPs.x = 0;
m_sdlRendererData->windowSizeInDIPs.y = 0;
m_sdlRendererData->swapChain = nullptr;
// TODO, WinRT: reconnect HandleDeviceLost to SDL_Renderer
CreateDeviceResources();
UpdateForWindowSizeChange();
}
// These are the resources that depend on the device.
void SDL_winrtrenderer::CreateDeviceResources()
{
DX::ThrowIfFailed(D3D11_CreateDeviceResources(m_sdlRenderer));
}
// Allocate all memory resources that change on a window SizeChanged event.
void SDL_winrtrenderer::CreateWindowSizeDependentResources()
{
DX::ThrowIfFailed(D3D11_CreateWindowSizeDependentResources(m_sdlRenderer));
}
void SDL_winrtrenderer::ResizeMainTexture(int w, int h)
{
const int pixelSizeInBytes = 4;
D3D11_TEXTURE2D_DESC textureDesc = {0};
textureDesc.Width = w;
textureDesc.Height = h;
textureDesc.MipLevels = 1;
textureDesc.ArraySize = 1;
textureDesc.Format = DXGI_FORMAT_B8G8R8X8_UNORM;
textureDesc.SampleDesc.Count = 1;
textureDesc.SampleDesc.Quality = 0;
textureDesc.Usage = D3D11_USAGE_DYNAMIC;
textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;
textureDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
textureDesc.MiscFlags = 0;
const int numPixels = textureDesc.Width * textureDesc.Height;
std::vector<uint8> initialTexturePixels(numPixels * pixelSizeInBytes, 0x00);
// Fill the texture with a non-black color, for debugging purposes:
//for (int i = 0; i < (numPixels * pixelSizeInBytes); i += pixelSizeInBytes) {
// initialTexturePixels[i+0] = 0xff;
// initialTexturePixels[i+1] = 0xff;
// initialTexturePixels[i+2] = 0x00;
// initialTexturePixels[i+3] = 0xff;
//}
D3D11_SUBRESOURCE_DATA initialTextureData = {0};
initialTextureData.pSysMem = (void *)&(initialTexturePixels[0]);
initialTextureData.SysMemPitch = textureDesc.Width * pixelSizeInBytes;
initialTextureData.SysMemSlicePitch = numPixels * pixelSizeInBytes;
DX::ThrowIfFailed(
m_sdlRendererData->d3dDevice->CreateTexture2D(
&textureDesc,
&initialTextureData,
&m_sdlRendererData->mainTexture
)
);
if (m_mainTextureHelperSurface) {
SDL_FreeSurface(m_mainTextureHelperSurface);
m_mainTextureHelperSurface = NULL;
}
m_mainTextureHelperSurface = SDL_CreateRGBSurfaceFrom(
NULL,
textureDesc.Width, textureDesc.Height,
(pixelSizeInBytes * 8),
0, // Use an nil pitch for now. This'll be filled in when updating the texture.
0x00ff0000, 0x0000ff00, 0x000000ff, 0x00000000); // TODO, WinRT: calculate masks given the Direct3D-defined pixel format of the texture
if (m_mainTextureHelperSurface == NULL) {
DX::ThrowIfFailed(E_FAIL); // TODO, WinRT: generate a better error here, taking into account who's calling this function.
}
D3D11_SHADER_RESOURCE_VIEW_DESC resourceViewDesc;
resourceViewDesc.Format = textureDesc.Format;
resourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
resourceViewDesc.Texture2D.MostDetailedMip = 0;
resourceViewDesc.Texture2D.MipLevels = textureDesc.MipLevels;
DX::ThrowIfFailed(
m_sdlRendererData->d3dDevice->CreateShaderResourceView(
m_sdlRendererData->mainTexture.Get(),
&resourceViewDesc,
&m_sdlRendererData->mainTextureResourceView)
);
}
// This method is called in the event handler for the SizeChanged event.
void SDL_winrtrenderer::UpdateForWindowSizeChange()
{
CoreWindow ^ coreWindow = D3D11_GetCoreWindowFromSDLRenderer(m_sdlRenderer);
if (coreWindow->Bounds.Width != m_sdlRendererData->windowSizeInDIPs.x ||
coreWindow->Bounds.Height != m_sdlRendererData->windowSizeInDIPs.y ||
m_sdlRendererData->orientation != DisplayProperties::CurrentOrientation)
{
ID3D11RenderTargetView* nullViews[] = {nullptr};
m_sdlRendererData->d3dContext->OMSetRenderTargets(ARRAYSIZE(nullViews), nullViews, nullptr);
m_sdlRendererData->renderTargetView = nullptr;
m_sdlRendererData->d3dContext->Flush();
CreateWindowSizeDependentResources();
}
}
void SDL_winrtrenderer::Render(SDL_Surface * surface, SDL_Rect * rects, int numrects)
{
const float blackColor[] = { 0.0f, 0.0f, 0.0f, 0.0f };
m_sdlRendererData->d3dContext->ClearRenderTargetView(
m_sdlRendererData->renderTargetView.Get(),
blackColor
);
// Only draw the screen once it is loaded (some loading is asynchronous).
if (!m_sdlRendererData->loadingComplete)
{
return;
}
if (!m_sdlRendererData->mainTextureResourceView)
{
return;
}
// Update the main texture (for SDL usage). Start by mapping the SDL
// window's main texture to CPU-accessible memory:
D3D11_MAPPED_SUBRESOURCE textureMemory = {0};
DX::ThrowIfFailed(
m_sdlRendererData->d3dContext->Map(
m_sdlRendererData->mainTexture.Get(),
0,
D3D11_MAP_WRITE_DISCARD,
0,
&textureMemory)
);
// Copy pixel data to the locked texture's memory:
m_mainTextureHelperSurface->pixels = textureMemory.pData;
m_mainTextureHelperSurface->pitch = textureMemory.RowPitch;
SDL_BlitSurface(surface, NULL, m_mainTextureHelperSurface, NULL);
// TODO, WinRT: only update the requested rects (passed to SDL_UpdateWindowSurface), rather than everything
// Clean up a bit, then commit the texture's memory back to Direct3D:
m_mainTextureHelperSurface->pixels = NULL;
m_mainTextureHelperSurface->pitch = 0;
m_sdlRendererData->d3dContext->Unmap(
m_sdlRendererData->mainTexture.Get(),
0);
m_sdlRendererData->d3dContext->OMSetRenderTargets(
1,
m_sdlRendererData->renderTargetView.GetAddressOf(),
nullptr
);
UINT stride = sizeof(VertexPositionColor);
UINT offset = 0;
m_sdlRendererData->d3dContext->IASetVertexBuffers(
0,
1,
m_sdlRendererData->vertexBuffer.GetAddressOf(),
&stride,
&offset
);
m_sdlRendererData->d3dContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
m_sdlRendererData->d3dContext->IASetInputLayout(m_sdlRendererData->inputLayout.Get());
m_sdlRendererData->d3dContext->VSSetShader(
m_sdlRendererData->vertexShader.Get(),
nullptr,
0
);
m_sdlRendererData->d3dContext->PSSetShader(
m_sdlRendererData->pixelShader.Get(),
nullptr,
0
);
m_sdlRendererData->d3dContext->PSSetShaderResources(0, 1, m_sdlRendererData->mainTextureResourceView.GetAddressOf());
m_sdlRendererData->d3dContext->PSSetSamplers(0, 1, m_sdlRendererData->mainSampler.GetAddressOf());
m_sdlRendererData->d3dContext->Draw(4, 0);
}
// Method to deliver the final image to the display.
void SDL_winrtrenderer::Present()
{
SDL_RenderPresent(m_sdlRenderer);
}
// Method to convert a length in device-independent pixels (DIPs) to a length in physical pixels.
float SDL_winrtrenderer::ConvertDipsToPixels(float dips)
{
static const float dipsPerInch = 96.0f;
return floor(dips * DisplayProperties::LogicalDpi / dipsPerInch + 0.5f); // Round to nearest integer.
}