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kayru/rastafontgpu.cpp

Last active December 9, 2017 18:20
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rastafontgpu.cpp
// cl /nologo /I "%DXSDK_DIR%\Include" rastafontgpu.cpp /link /LIBPATH:"%DXSDK_DIR%\Lib\x86"
#include <tchar.h>
#include <stdint.h>
#include <stdio.h>
#include <windows.h>
#include <D3D11.h>
#pragma comment(lib, "kernel32.lib")
#pragma comment(lib, "gdi32.lib")
#pragma comment(lib, "user32.lib")
#pragma comment(lib, "d3d11.lib")
static const uint32_t WindowWidth = 1280;
static const uint32_t WindowHeight = 720;
static const char* WindowName = "Rastafont GPU";
#define CHECKHR(hr) {if(FAILED(hr)){printf("D3D Error at line %d: 0x%08X\n", __LINE__,(int)hr); DebugBreak();}}
// https://gist.github.com/kayru/7573287
const unsigned char g_rastaforn8x8_cs[] = {
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0x00,0x00,0x80,0x3F,0x00,0x00,0x80,0x3F,0x00,0x00,0x80,0x3F,0x15,0x00,0x00,0x01,
0x3E,0x00,0x00,0x01,0x53,0x54,0x41,0x54,0x94,0x00,0x00,0x00,0x0E,0x00,0x00,0x00,
0x01,0x00,0x00,0x00,0xBE,0x00,0x00,0x00,0x03,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x04,0x00,0x00,0x00,0x02,0x00,0x00,0x00,0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
};
struct Context
{
HWND hwnd;
bool finished;
ID3D11Device* device;
ID3D11DeviceContext* device_context;
IDXGISwapChain* swap_chain;
ID3D11Texture2D* backbuffer_tex;
ID3D11RenderTargetView* backbuffer_rtv;
ID3D11UnorderedAccessView* backbuffer_uav;
ID3D11Texture2D* text_tex;
ID3D11ShaderResourceView* text_srv;
ID3D11ComputeShader* font_cs;
};
template <typename T>
inline void safe_release(T& x)
{
if(x)
{
x->Release();
x=NULL;
}
}
LRESULT APIENTRY WndProc( HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam )
{
Context* ctx = reinterpret_cast<Context*>(GetWindowLongPtr(hwnd, GWLP_USERDATA));
switch(msg)
{
case WM_CLOSE:
ctx->finished = true;
default:
return (LONG)DefWindowProc(hwnd, msg, wparam, lparam);
}
}
Context* Init()
{
Context* ctx = new Context;
ZeroMemory(ctx, sizeof(*ctx));
ctx->finished = false;
// register window class
WNDCLASSEX wc = {0};
HINSTANCE hInst = GetModuleHandle(NULL);
wc.cbSize = sizeof(WNDCLASSEX);
wc.style = CS_DBLCLKS | CS_OWNDC | CS_HREDRAW |CS_VREDRAW;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInst;
wc.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor (NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = _T("BoilerplateWindowClass");
wc.hIconSm = wc.hIcon;
RegisterClassEx(&wc);
uint32_t window_style = WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
// find screen center and create our window there
int32_t pos_x = GetSystemMetrics(SM_CXSCREEN) / 2 - WindowWidth/2;
int32_t pos_y = GetSystemMetrics(SM_CYSCREEN) / 2 - WindowHeight/2;
// calculate window size for required client area
RECT client_rect = { pos_x, pos_y, pos_x+WindowWidth, pos_y+WindowHeight};
AdjustWindowRect(&client_rect, window_style, FALSE);
// create window
ctx->hwnd = CreateWindowA("BoilerplateWindowClass", WindowName, window_style,
client_rect.left, client_rect.top,
client_rect.right-client_rect.left, client_rect.bottom-client_rect.top,
NULL, NULL, hInst, NULL);
// setup window owner for message handling
SetWindowLongPtr(ctx->hwnd, GWLP_USERDATA, (LONG_PTR)ctx);
ShowWindow(ctx->hwnd, SW_SHOWNORMAL);
UpdateWindow(ctx->hwnd);
// Create D3D11
DXGI_SWAP_CHAIN_DESC sd = {0};
ZeroMemory( &sd, sizeof( sd ) );
sd.BufferCount = 1;
sd.BufferDesc.Width = WindowWidth;
sd.BufferDesc.Height = WindowHeight;
sd.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
sd.BufferDesc.RefreshRate.Numerator = 60;
sd.BufferDesc.RefreshRate.Denominator = 1;
sd.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT | DXGI_USAGE_UNORDERED_ACCESS;
sd.OutputWindow = ctx->hwnd;
sd.SampleDesc.Count = 1;
sd.SampleDesc.Quality = 0;
sd.Windowed = TRUE;
D3D_DRIVER_TYPE type = D3D_DRIVER_TYPE_HARDWARE;
IDXGIAdapter* adapter = NULL;
IDXGIAdapter* enumerated_adapter = NULL;
D3D_FEATURE_LEVEL features[] = { D3D_FEATURE_LEVEL_11_0 };
const uint32_t num_features = sizeof(features) / sizeof(features[0]);
// Create device
D3D_FEATURE_LEVEL supported_features;
CHECKHR(D3D11CreateDeviceAndSwapChain(adapter, type, NULL, D3D11_CREATE_DEVICE_SINGLETHREADED, features, num_features,
D3D11_SDK_VERSION, &sd, &ctx->swap_chain, &ctx->device,
&supported_features, &ctx->device_context));
// Get default back buffer
CHECKHR(ctx->swap_chain->GetBuffer(0, __uuidof(ID3D11Texture2D), (void**)&ctx->backbuffer_tex));
CHECKHR(ctx->device->CreateRenderTargetView(ctx->backbuffer_tex, NULL, &ctx->backbuffer_rtv));
D3D11_UNORDERED_ACCESS_VIEW_DESC uav;
uav.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
uav.ViewDimension = D3D11_UAV_DIMENSION_TEXTURE2D;
uav.Texture2D.MipSlice = 0;
CHECKHR(ctx->device->CreateUnorderedAccessView(ctx->backbuffer_tex, &uav, &ctx->backbuffer_uav));
// Create compute shader
CHECKHR(ctx->device->CreateComputeShader(g_rastaforn8x8_cs, sizeof(g_rastaforn8x8_cs), NULL, &ctx->font_cs));
// Create texture with text
char text[WindowWidth*WindowHeight] = {0};
sprintf(text + WindowWidth*2 + 2, "the quick brown fox jumps over the lazy dog");
sprintf(text + WindowWidth*4 + 2, "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG");
sprintf(text + WindowWidth*6 + 2, "0 1 2 3 4 5 6 7 8 9");
sprintf(text + WindowWidth*8 + 2, "! \" # $ % & ' ( ) * + , - .");
sprintf(text + WindowWidth*10 + 2, ": ; < = > ? @ ^ _ ` { | } ~");
D3D11_SUBRESOURCE_DATA tex_data = {0};
tex_data.pSysMem = text;
tex_data.SysMemPitch = WindowWidth;
D3D11_TEXTURE2D_DESC tex = CD3D11_TEXTURE2D_DESC(DXGI_FORMAT_R8_UINT, WindowWidth, WindowHeight, 1, 1);
CHECKHR(ctx->device->CreateTexture2D(&tex, &tex_data, &ctx->text_tex));
CHECKHR(ctx->device->CreateShaderResourceView(ctx->text_tex, NULL, &ctx->text_srv));
// Set-up default Colour and Depth surfaces
ctx->device_context->OMSetRenderTargets(1, &ctx->backbuffer_rtv, NULL);
// All done, ready to rock
return ctx;
}
void Update(Context* ctx)
{
const float colour_array[4] = { 0.1f, 0.2f, 0.3f, 1.0f };
ctx->device_context->ClearRenderTargetView(ctx->backbuffer_rtv, colour_array);
ctx->device_context->CSSetShaderResources(0, 1, &ctx->text_srv);
ctx->device_context->CSSetUnorderedAccessViews(0, 1, &ctx->backbuffer_uav, NULL);
ctx->device_context->CSSetShader(ctx->font_cs, NULL, 0);
ctx->device_context->Dispatch(WindowWidth/8, WindowHeight/8, 1);
// All done, now swap
CHECKHR(ctx->swap_chain->Present(0, 0));
}
void Shutdown(Context* ctx)
{
safe_release(ctx->font_cs);
safe_release(ctx->backbuffer_uav);
safe_release(ctx->backbuffer_rtv);
safe_release(ctx->backbuffer_tex);
safe_release(ctx->text_tex);
safe_release(ctx->text_srv);
safe_release(ctx->swap_chain);
safe_release(ctx->device_context);
safe_release(ctx->device);
delete ctx;
}
int main()
{
Context* ctx = Init();
while(ctx->finished == false)
{
MSG msg;
while( PeekMessage(&msg, NULL, 0, 0, PM_REMOVE) )
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
Update(ctx);
}
Shutdown(ctx);
return 0;
}
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