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Separate dchip update from rendering

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This commit is contained in:
Doyle Thai 2017-04-04 16:27:49 +10:00
parent 1c4c6d3dca
commit de4365126d
10 changed files with 292 additions and 248 deletions
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6
dchip-8.vcxproj
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@ -18,6 +18,9 @@
<Platform>x64</Platform>
</ProjectConfiguration>
</ItemGroup>
<ItemGroup>
<ClCompile Include="src\unity_build.cpp" />
</ItemGroup>
<PropertyGroup Label="Globals">
<ProjectGuid>{01B5A474-4BA5-48A3-B645-7116ADF5585D}</ProjectGuid>
<RootNamespace>dchip8</RootNamespace>
@ -119,9 +122,6 @@
<OptimizeReferences>true</OptimizeReferences>
</Link>
</ItemDefinitionGroup>
<ItemGroup>
<ClCompile Include="src\dchip-8.cpp" />
</ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">
</ImportGroup>

2
dchip-8.vcxproj.filters
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@ -15,7 +15,7 @@
</Filter>
</ItemGroup>
<ItemGroup>
<ClCompile Include="src\dchip-8.cpp">
<ClCompile Include="src\unity_build.cpp">
<Filter>Source Files</Filter>
</ClCompile>
</ItemGroup>

1
src/Common.h
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@ -4,7 +4,6 @@
#include "stdint.h"
#define LOCAL_PERSIST static
#define GLOBAL_VAR static
#define FILE_SCOPE static
typedef uint32_t u32;

5
src/build.bat
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@ -2,7 +2,8 @@
@REM vcvarsall.bat to setup command-line compiler.
@echo OFF
set ProjectName=dchip-8
set ProjectName=dchip8
set CompileEntryPoint=..\src\unity_build.cpp
ctime -begin %ProjectName%.ctm
@ -47,7 +48,7 @@ REM incrmenetal:no, turn incremental builds off
REM opt:ref, try to remove functions from libs that are referenced at all
set LinkFlags=-incremental:no -opt:ref
cl %CompileFlags% ..\src\%ProjectName%.cpp %IncludeFlags% /link -subsystem:WINDOWS,5.1 %LinkLibraries% %LinkFlags% /nologo /OUT:"%ProjectName%.exe"
cl %CompileFlags% %CompileEntryPoint% %IncludeFlags% /link -subsystem:WINDOWS,5.1 %LinkLibraries% %LinkFlags% /nologo /OUT:"%ProjectName%.exe"
popd
ctime -end %ProjectName%.ctm

241
src/dchip-8.cpp
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@ -1,241 +0,0 @@
#define UNICODE
#define _UNICODE
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include "Common.h"
#include <Windows.h>
#include <stdio.h>
#include <stdlib.h>
FILE_SCOPE HBITMAP bitmap;
FILE_SCOPE BITMAPINFO bitmapInfo;
const i32 WIDTH = 64;
const i32 HEIGHT = 32;
const i32 RESOLUTION = WIDTH * HEIGHT;
FILE_SCOPE void *bitmapMemory;
FILE_SCOPE bool globalRunning = false;
FILE_SCOPE LRESULT CALLBACK mainWindowProcCallback(HWND window, UINT msg,
WPARAM wParam, LPARAM lParam)
{
LRESULT result = 0;
switch (msg)
{
case WM_CLOSE:
case WM_DESTROY:
{
globalRunning = false;
}
break;
default:
{
result = DefWindowProc(window, msg, wParam, lParam);
}
break;
}
return result;
}
GLOBAL_VAR LARGE_INTEGER globalQueryPerformanceFrequency;
inline FILE_SCOPE f32 getTimeFromQueryPerfCounter(LARGE_INTEGER start,
LARGE_INTEGER end)
{
f32 result = (f32)(end.QuadPart - start.QuadPart) /
globalQueryPerformanceFrequency.QuadPart;
return result;
}
inline FILE_SCOPE LARGE_INTEGER getWallClock()
{
LARGE_INTEGER result;
QueryPerformanceCounter(&result);
return result;
}
#define ErrorBox(text, title) MessageBox(nullptr, text, title, MB_OK);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nShowCmd)
{
WNDCLASSEX wc =
{
sizeof(WNDCLASSEX),
CS_HREDRAW | CS_VREDRAW | CS_OWNDC,
mainWindowProcCallback,
0, // int cbClsExtra
0, // int cbWndExtra
hInstance,
LoadIcon(NULL, IDI_APPLICATION),
LoadCursor(NULL, IDC_ARROW),
GetSysColorBrush(COLOR_3DFACE),
L"", // LPCTSTR lpszMenuName
L"dchip-8Class",
NULL, // HICON hIconSm
};
if (!RegisterClassEx(&wc)) {
ErrorBox(L"RegisterClassEx() failed.", nullptr);
return -1;
}
globalRunning = true;
// NOTE: Regarding Window Sizes
// If you specify a window size, e.g. 800x600, Windows regards the 800x600
// region to be inclusive of the toolbars and side borders. So in actuality,
// when you blit to the screen blackness, the area that is being blitted to
// is slightly smaller than 800x600. Windows provides a function to help
// calculate the size you'd need by accounting for the window style.
RECT rect = {};
rect.right = 128;
rect.bottom = 64;
DWORD windowStyle =
WS_OVERLAPPEDWINDOW | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
AdjustWindowRect(&rect, windowStyle, FALSE);
HWND mainWindow = CreateWindowEx(
WS_EX_COMPOSITED, wc.lpszClassName, L"dchip-8", windowStyle,
CW_USEDEFAULT, CW_USEDEFAULT, rect.right - rect.left,
rect.bottom - rect.top, nullptr, nullptr, hInstance, nullptr);
if (!mainWindow)
{
ErrorBox(L"CreateWindowEx() failed.", nullptr);
return -1;
}
QueryPerformanceFrequency(&globalQueryPerformanceFrequency);
LARGE_INTEGER startFrameTime;
const f32 targetFramesPerSecond = 16.0f;
f32 targetSecondsPerFrame = 1 / targetFramesPerSecond;
f32 frameTimeInS = 0.0f;
{
BITMAPINFOHEADER header = {};
header.biSize = sizeof(BITMAPINFOHEADER);
header.biWidth = WIDTH;
header.biHeight = HEIGHT;
header.biPlanes = 1;
header.biBitCount = 32;
header.biCompression = BI_RGB; // uncompressed bitmap
header.biSizeImage = 0;
header.biXPelsPerMeter = 0;
header.biYPelsPerMeter = 0;
header.biClrUsed = 0;
header.biClrImportant = 0;
bitmapInfo.bmiHeader = header;
const i32 numPixels = header.biWidth * header.biHeight;
const i32 bytesPerPixel = header.biBitCount / 8;
#if 0
bitmapMemory = calloc(1, numPixels * bytesPerPixel);
if (!bitmapMemory)
{
ErrorBox(L"malloc() failed.", nullptr);
return -1;
}
#else
HDC deviceContext = GetDC(mainWindow);
bitmap = CreateDIBSection(deviceContext, &bitmapInfo, DIB_RGB_COLORS,
&bitmapMemory, NULL, NULL);
ReleaseDC(mainWindow, deviceContext);
if (!bitmapMemory)
{
ErrorBox(L"CreateDIBSection() failed.", nullptr);
return -1;
}
#endif
u32 *bitmapBuffer = (u32 *)bitmapMemory;
for (i32 i = 0; i < numPixels; i++)
{
// NOTE: Win32 AlphaBlend requires the RGB components to be
// premultiplied with alpha.
f32 normA = 1.0f;
f32 normR = (normA * 0.0f);
f32 normG = (normA * 0.0f);
f32 normB = (normA * 1.0f);
u8 r = (u8)(normR * 255.0f);
u8 g = (u8)(normG * 255.0f);
u8 b = (u8)(normB * 255.0f);
u8 a = (u8)(normA * 255.0f);
u32 color = (a << 24) | (r << 16) | (g << 8) | (b << 0);
bitmapBuffer[i] = color;
}
}
MSG msg;
while (globalRunning)
{
startFrameTime = getWallClock();
while (PeekMessage(&msg, mainWindow, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
RECT clientRect = {};
GetClientRect(mainWindow, &clientRect);
LONG clientWidth = clientRect.right - clientRect.left;
LONG clientHeight = clientRect.bottom - clientRect.top;
BLENDFUNCTION blend = {};
blend.BlendOp = AC_SRC_OVER;
blend.SourceConstantAlpha = 255;
blend.AlphaFormat = AC_SRC_ALPHA;
HDC deviceContext = GetDC(mainWindow);
HDC alphaBlendDC = CreateCompatibleDC(deviceContext);
SelectObject(alphaBlendDC, bitmap);
AlphaBlend(deviceContext, 0, 0, WIDTH, HEIGHT, alphaBlendDC, 0, 0,
WIDTH, HEIGHT, blend);
StretchBlt(deviceContext, 0, 0, clientWidth, clientHeight,
deviceContext, 0, 0, WIDTH, HEIGHT, SRCCOPY);
DeleteDC(alphaBlendDC);
ReleaseDC(mainWindow, deviceContext);
////////////////////////////////////////////////////////////////////////
// Frame Limiting
////////////////////////////////////////////////////////////////////////
LARGE_INTEGER endWorkTime = getWallClock();
f32 workTimeInS =
getTimeFromQueryPerfCounter(startFrameTime, endWorkTime);
if (workTimeInS < targetSecondsPerFrame)
{
DWORD remainingTimeInMs =
(DWORD)((targetSecondsPerFrame - workTimeInS) * 1000);
Sleep(remainingTimeInMs);
}
LARGE_INTEGER endFrameTime = getWallClock();
frameTimeInS =
getTimeFromQueryPerfCounter(startFrameTime, endFrameTime);
f32 msPerFrame = 1000.0f * frameTimeInS;
wchar_t windowTitleBuffer[128] = {};
_snwprintf_s(windowTitleBuffer, ARRAY_COUNT(windowTitleBuffer),
ARRAY_COUNT(windowTitleBuffer), L"dchip-8 | %5.2f ms/f",
msPerFrame);
SetWindowText(mainWindow, windowTitleBuffer);
}
return 0;
}

27
src/dchip8.cpp Normal file
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@ -0,0 +1,27 @@
#include "common.h"
#include "dchip8_platform.h"
void dchip8_update(PlatformRenderBuffer *renderBuffer)
{
ASSERT(renderBuffer.bytesPerPixel == 4);
const i32 numPixels = renderBuffer->width * renderBuffer->height;
u32 *bitmapBuffer = (u32 *)renderBuffer->memory;
for (i32 i = 0; i < numPixels; i++)
{
// NOTE: Win32 AlphaBlend requires the RGB components to be
// premultiplied with alpha.
f32 normA = 1.0f;
f32 normR = (normA * 0.0f);
f32 normG = (normA * 0.0f);
f32 normB = (normA * 1.0f);
u8 r = (u8)(normR * 255.0f);
u8 g = (u8)(normG * 255.0f);
u8 b = (u8)(normB * 255.0f);
u8 a = (u8)(normA * 255.0f);
u32 color = (a << 24) | (r << 16) | (g << 8) | (b << 0);
bitmapBuffer[i] = color;
}
}

8
src/dchip8.h Normal file
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@ -0,0 +1,8 @@
#ifndef DCHIP8_H
#define DCHIP8_H
#include "dchip8_platform.h"
void dchip8_update(PlatformRenderBuffer *renderBuffer);
#endif

14
src/dchip8_platform.h Normal file
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@ -0,0 +1,14 @@
#ifndef DCHIP_8_PLATFORM
#define DCHIP_8_PLATFORM
#include "Common.h"
typedef struct PlatformRenderBuffer
{
i32 width;
i32 height;
i32 bytesPerPixel;
void *memory;
} PlatformRenderBuffer;
#endif

3
src/unity_build.cpp Normal file
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@ -0,0 +1,3 @@
#include "win32_dchip8.cpp"
#include "dchip8.cpp"

233
src/win32_dchip8.cpp Normal file
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@ -0,0 +1,233 @@
#define UNICODE
#define _UNICODE
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <Windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "common.h"
#include "dchip8.h"
#include "dchip8_platform.h"
FILE_SCOPE bool globalRunning = false;
FILE_SCOPE LARGE_INTEGER globalQueryPerformanceFrequency;
#define win32_error_box(text, title) MessageBox(nullptr, text, title, MB_OK);
FILE_SCOPE LRESULT CALLBACK win32_main_proc_callback(HWND window, UINT msg,
WPARAM wParam,
LPARAM lParam)
{
LRESULT result = 0;
switch (msg)
{
case WM_CLOSE:
case WM_DESTROY:
{
globalRunning = false;
}
break;
default:
{
result = DefWindowProc(window, msg, wParam, lParam);
}
break;
}
return result;
}
inline FILE_SCOPE f32 win32_query_perf_counter_get_time(LARGE_INTEGER start,
LARGE_INTEGER end)
{
f32 result = (f32)(end.QuadPart - start.QuadPart) /
globalQueryPerformanceFrequency.QuadPart;
return result;
}
inline FILE_SCOPE LARGE_INTEGER win32_query_perf_counter_time()
{
LARGE_INTEGER result;
QueryPerformanceCounter(&result);
return result;
}
typedef struct Win32RenderBitmap
{
BITMAPINFO info;
HBITMAP handle;
i32 width;
i32 height;
i32 bytesPerPixel;
void *memory;
} Win32RenderBitmap;
FILE_SCOPE void win32_display_render_bitmap(Win32RenderBitmap renderBitmap,
HDC deviceContext, LONG width,
LONG height)
{
BLENDFUNCTION blend = {};
blend.BlendOp = AC_SRC_OVER;
blend.SourceConstantAlpha = 255;
blend.AlphaFormat = AC_SRC_ALPHA;
HDC alphaBlendDC = CreateCompatibleDC(deviceContext);
SelectObject(alphaBlendDC, renderBitmap.handle);
AlphaBlend(deviceContext, 0, 0, width, height, alphaBlendDC, 0, 0,
renderBitmap.width, renderBitmap.height, blend);
StretchBlt(deviceContext, 0, 0, width, height, deviceContext, 0, 0,
renderBitmap.width, renderBitmap.height, SRCCOPY);
DeleteDC(alphaBlendDC);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nShowCmd)
{
WNDCLASSEX wc =
{
sizeof(WNDCLASSEX),
CS_HREDRAW | CS_VREDRAW | CS_OWNDC,
win32_main_proc_callback,
0, // int cbClsExtra
0, // int cbWndExtra
hInstance,
LoadIcon(NULL, IDI_APPLICATION),
LoadCursor(NULL, IDC_ARROW),
NULL, // GetSysColorBrush(COLOR_3DFACE),
L"", // LPCTSTR lpszMenuName
L"dchip-8Class",
NULL, // HICON hIconSm
};
if (!RegisterClassEx(&wc)) {
win32_error_box(L"RegisterClassEx() failed.", nullptr);
return -1;
}
// NOTE: Regarding Window Sizes
// If you specify a window size, e.g. 800x600, Windows regards the 800x600
// region to be inclusive of the toolbars and side borders. So in actuality,
// when you blit to the screen blackness, the area that is being blitted to
// is slightly smaller than 800x600. Windows provides a function to help
// calculate the size you'd need by accounting for the window style.
RECT rect = {};
rect.right = 128;
rect.bottom = 64;
DWORD windowStyle =
WS_OVERLAPPEDWINDOW | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN;
AdjustWindowRect(&rect, windowStyle, FALSE);
HWND mainWindow = CreateWindowEx(
WS_EX_COMPOSITED, wc.lpszClassName, L"dchip-8", windowStyle,
CW_USEDEFAULT, CW_USEDEFAULT, rect.right - rect.left,
rect.bottom - rect.top, nullptr, nullptr, hInstance, nullptr);
if (!mainWindow)
{
win32_error_box(L"CreateWindowEx() failed.", nullptr);
return -1;
}
Win32RenderBitmap renderBitmap = {};
{ // Initialise the renderbitmap
BITMAPINFOHEADER header = {};
header.biSize = sizeof(BITMAPINFOHEADER);
header.biWidth = 64;
header.biHeight = 32;
header.biPlanes = 1;
header.biBitCount = 32;
header.biCompression = BI_RGB; // uncompressed bitmap
header.biSizeImage = 0;
header.biXPelsPerMeter = 0;
header.biYPelsPerMeter = 0;
header.biClrUsed = 0;
header.biClrImportant = 0;
renderBitmap.info.bmiHeader = header;
renderBitmap.width = header.biWidth;
renderBitmap.height = header.biHeight;
renderBitmap.bytesPerPixel = header.biBitCount / 8;
ASSERT(renderBitmap.bytesPerPixel >= 1);
HDC deviceContext = GetDC(mainWindow);
renderBitmap.handle =
CreateDIBSection(deviceContext, &renderBitmap.info, DIB_RGB_COLORS,
&renderBitmap.memory, NULL, NULL);
ReleaseDC(mainWindow, deviceContext);
}
if (!renderBitmap.memory)
{
win32_error_box(L"CreateDIBSection() failed.", nullptr);
return -1;
}
////////////////////////////////////////////////////////////////////////////
// Update Loop
////////////////////////////////////////////////////////////////////////////
QueryPerformanceFrequency(&globalQueryPerformanceFrequency);
const f32 TARGET_FRAMES_PER_S = 60.0f;
f32 targetSecondsPerFrame = 1 / TARGET_FRAMES_PER_S;
f32 frameTimeInS = 0.0f;
globalRunning = true;
while (globalRunning)
{
LARGE_INTEGER startFrameTime = win32_query_perf_counter_time();
MSG msg;
while (PeekMessage(&msg, mainWindow, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
////////////////////////////////////////////////////////////////////////
// Rendering
////////////////////////////////////////////////////////////////////////
PlatformRenderBuffer renderBuffer = {};
renderBuffer.memory = renderBitmap.memory;
renderBuffer.height = renderBitmap.height;
renderBuffer.width = renderBitmap.width;
dchip8_update(&renderBuffer);
HDC deviceContext = GetDC(mainWindow);
win32_display_render_bitmap(renderBitmap, deviceContext, clientWidth,
clientHeight);
ReleaseDC(mainWindow, deviceContext);
////////////////////////////////////////////////////////////////////////
// Frame Limiting
////////////////////////////////////////////////////////////////////////
LARGE_INTEGER endWorkTime = win32_query_perf_counter_time();
f32 workTimeInS =
win32_query_perf_counter_get_time(startFrameTime, endWorkTime);
if (workTimeInS < targetSecondsPerFrame)
{
DWORD remainingTimeInMs =
(DWORD)((targetSecondsPerFrame - workTimeInS) * 1000);
Sleep(remainingTimeInMs);
}
LARGE_INTEGER endFrameTime = win32_query_perf_counter_time();
frameTimeInS =
win32_query_perf_counter_get_time(startFrameTime, endFrameTime);
f32 msPerFrame = 1000.0f * frameTimeInS;
wchar_t windowTitleBuffer[128] = {};
_snwprintf_s(windowTitleBuffer, ARRAY_COUNT(windowTitleBuffer),
ARRAY_COUNT(windowTitleBuffer), L"dchip-8 | %5.2f ms/f",
msPerFrame);
SetWindowText(mainWindow, windowTitleBuffer);
}
return 0;
}