update

src/handmade.cpp

@@ -2,22 +2,41 @@
 
 #define PI32 3.141592653589f
 
+internal void renderPlayer(GameOffscreenBuffer *buffer, int playerX, int playerY) {
+    uint8 *endOfBuffer = (uint8 *)buffer->memory + buffer->pitch*buffer->height;
+    uint32 color = 0xFFFFFFFF;
+    int top = playerY;
+    int bottom = playerY + 10;
+    for (int x = playerX; x < playerX + 10; x++) {
+        uint8 *pixel = ((uint8 *)buffer->memory + x * buffer->bytesPerPixel + top*buffer->pitch);
+        for (int y = top; y < bottom; y++) {
+            if ((pixel >= buffer->memory) && (pixel + 4 < endOfBuffer)) {
+                *(uint32 *)pixel = color;
+            }
+            pixel += buffer->pitch;
+        }
+    }
+
+}
+
 internal void outputSineSound(GameSoundOutputBuffer *soundBuffer, GameState *state) {
     int16 toneVolume = 3000;
     int wavePeriod = soundBuffer->samplesPerSecond/state->toneHz;
 
     int16 *sampleOut = soundBuffer->samples;
     for (int sampleIndex = 0; sampleIndex < soundBuffer->sampleCount; sampleIndex++) {
-        int16 sampleValue = (int16)(sin(state->tSine) * (real32)toneVolume);
-        *sampleOut++ = sampleValue;
-        *sampleOut++ = sampleValue;
         state->tSine += 2.0f * PI32 / (real32)wavePeriod;
+#if 0
+        int16 sampleValue = (int16)(sin(state->tSine) * (real32)toneVolume);
+#else
+        int16 sampleValue = 0;
+#endif
+        *sampleOut++ = sampleValue;
+        *sampleOut++ = sampleValue;
     }
 }
 
 internal void renderWeirdGradient(GameOffscreenBuffer *buffer, int xOffset, int yOffset) {
-    int bytesPerPixel = 4;
-    int pitch = buffer->width*bytesPerPixel;
     uint8 *row = (uint8 *)buffer->memory;
     for (int y = 0; y < buffer->height; y++) {
         uint32 *pixel = (uint32*)row;
@@ -26,7 +45,7 @@ internal void renderWeirdGradient(GameOffscreenBuffer *buffer, int xOffset, int
             uint8 green = (uint8)(y + yOffset);
             *pixel++ = (green << 8) | blue;
         }
-        row += pitch;
+        row += buffer->pitch;
     }
 }
 
@@ -46,11 +65,16 @@ extern "C" GAME_UPDATE_AND_RENDER(gameUpdateAndRender) {
 
         state->toneHz = 440;
         state->tSine = 0;
+        state->playerY = 100;
+        state->playerX = 100;
+        state->blueOffset = 0;
+        state->greenOffset = 0;
         memory->isInitialised = true;
     }
 
     for (int controllerIndex = 0; controllerIndex < ArrayCount(input->controllers); controllerIndex++) {
         GameControllerInput *controllerInput = &input->controllers[controllerIndex];
+        /*
         if (controllerInput->isAnalog) {
             state->toneHz = 440 + (int)(128.0f*controllerInput->stickAvgX);
             state->greenOffset -= (int)(20.0f*controllerInput->stickAvgX);
@@ -69,9 +93,18 @@ extern "C" GAME_UPDATE_AND_RENDER(gameUpdateAndRender) {
                 state->blueOffset -= 10;
             }
         }
+        */
+
+        if (controllerInput->btnDown.endedDown) {
+            state->playerY -= 30;
+        }
+
+        state->playerX += (int)(4.0f*controllerInput->stickAvgX);
+        state->playerY -= (int)(4.0f*controllerInput->stickAvgY);
     }
 
     renderWeirdGradient(videoBuf, state->greenOffset, state->blueOffset);
+    renderPlayer(videoBuf, state->playerX, state->playerY);
 }
 
 extern "C" GAME_GET_SOUND_SAMPLES(gameGetSoundSamples) {

src/handmade.h

@@ -97,6 +97,8 @@ struct GameOffscreenBuffer {
     void *memory;
     int width;
     int height;
+    int bytesPerPixel;
+    int pitch; // Bytes per row
 };
 
 struct GameButtonState {
@@ -151,6 +153,8 @@ struct GameState {
     int greenOffset;
     int blueOffset;
     real32 tSine;
+    int playerY;
+    int playerX;
 };
 
 // === Game to platform services ===

src/win32_handmade.cpp

@@ -104,6 +104,7 @@ internal void resizeDIBSection(Win32OffscreenBuffer *buffer, int width, int heig
     buffer->width = width;
     buffer->height = height;
     buffer->bytesPerPixel = 4;
+    buffer->pitch = buffer->width*buffer->bytesPerPixel;
 
     buffer->info.bmiHeader.biSize = sizeof(buffer->info.bmiHeader);
     buffer->info.bmiHeader.biWidth = buffer->width;
@@ -359,7 +360,56 @@ internal void win32FillSoundBuffer(Win32SoundOutput *soundOutput, DWORD byteToLo
     }
 }
 
-internal void win32ProcessPendingMessages(GameControllerInput *keyboardController) {
+internal void win32BeginRecordingInput(Win32State *win32State, int inputRecordingIndex) {
+    win32State->inputRecordingIndex = inputRecordingIndex;
+    char *filename = "recording.hmi";
+    win32State->recordingHandle = CreateFileA(filename, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, NULL, NULL);
+    DWORD bytesToWrite = (DWORD)win32State->gameMemoryTotalSize;
+    Assert(bytesToWrite < 0xFFFFFFFF);
+    DWORD bytesWritten;
+    WriteFile(win32State->recordingHandle, win32State->gameMemoryBlock, bytesToWrite, &bytesWritten, NULL);
+}
+
+internal void win32EndRecordingInput(Win32State *win32State) {
+    CloseHandle(win32State->recordingHandle);
+    win32State->inputRecordingIndex = 0;
+}
+
+internal void win32RecordInput(Win32State *win32State, GameInput *newInput) {
+    DWORD bytesWritten;
+    WriteFile(win32State->recordingHandle, newInput, sizeof(*newInput), &bytesWritten, NULL);
+}
+
+internal void win32BeginInputPlayback(Win32State *win32State, int inputPlayingIndex) {
+    win32State->inputPlayingIndex = inputPlayingIndex;
+    char *filename = "recording.hmi";
+    win32State->playbackHandle = CreateFileA(filename, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, NULL, NULL);
+    DWORD bytesToRead = (DWORD)win32State->gameMemoryTotalSize;
+    Assert(bytesToRead < 0xFFFFFFFF);
+    DWORD bytesRead;
+    ReadFile(win32State->playbackHandle, win32State->gameMemoryBlock, bytesToRead, &bytesRead, NULL);
+}
+
+internal void win32EndInputPlayback(Win32State *win32State) {
+    CloseHandle(win32State->playbackHandle);
+    win32State->inputPlayingIndex = 0;
+}
+
+internal void win32PlaybackInput(Win32State *win32State, GameInput *newInput) {
+    DWORD bytesRead;
+    if (ReadFile(win32State->playbackHandle, newInput, sizeof(*newInput), &bytesRead, NULL)) {
+        if (bytesRead == 0) {
+            // Restart
+            int playingIndex = win32State->inputPlayingIndex;
+            win32EndInputPlayback(win32State);
+            win32BeginInputPlayback(win32State, playingIndex);
+        } else {
+            // there's still input, read next input
+        }
+    }
+}
+
+internal void win32ProcessPendingMessages(Win32State *win32State, GameControllerInput *keyboardController) {
     MSG message;
     while (PeekMessageA(&message, NULL, NULL, NULL, PM_REMOVE)) {
         if (message.message == WM_QUIT) {
@@ -397,6 +447,15 @@ internal void win32ProcessPendingMessages(GameControllerInput *keyboardControlle
                     } else if (VKCode == VK_RIGHT) {
                         win32ProcessKeyboardKeypress(&keyboardController->btnRight, isDown);
                     } else if (VKCode == VK_SPACE) {
+                    } else if (VKCode == 'L') {
+                        if (isDown) {
+                            if (win32State->inputRecordingIndex == 0) {
+                                win32BeginRecordingInput(win32State, 1);
+                            } else {
+                                win32EndRecordingInput(win32State);
+                                win32BeginInputPlayback(win32State, 1);
+                            }
+                        }
                     }
                 }
 
@@ -430,12 +489,11 @@ inline real32 win32GetSecondsElapsed(LARGE_INTEGER start, LARGE_INTEGER end) {
 #define monitorRefreshHz 60
 #define gameUpdateHz (monitorRefreshHz / 2)
 
-internal void win32DebugDrawVertical(Win32OffscreenBuffer *screenBuffer, int x, int top, int bottom, int32 color) {
+internal void win32DebugDrawVertical(Win32OffscreenBuffer *buffer, int x, int top, int bottom, int32 color) {
-    int pitch = screenBuffer->width*screenBuffer->bytesPerPixel; 
+    uint8 *pixel = (uint8 *)buffer->memory + top * buffer->pitch + x*buffer->bytesPerPixel;
-    uint8 *pixel = (uint8 *)screenBuffer->memory + top * pitch + x*screenBuffer->bytesPerPixel;
     for (int y = top; y < bottom; y++) {
         *(uint32 *)pixel = color;
-        pixel += pitch;
+        pixel += buffer->pitch;
     }
 }
 
@@ -445,26 +503,27 @@ inline void win32DrawSoundBufferMarker(Win32OffscreenBuffer *buffer, Win32SoundO
     win32DebugDrawVertical(buffer, x, top, bottom, color);
 }
 
-internal void win32DebugSyncDisplay(Win32OffscreenBuffer *screenBuffer, int markerCount, Win32DebugTimeMarker *markers, Win32SoundOutput *soundOutput, real32 targetSecondsPerFrame) {
+internal void win32DebugSyncDisplay(Win32OffscreenBuffer *buffer, int markerCount, Win32DebugTimeMarker *markers, Win32SoundOutput *soundOutput, real32 targetSecondsPerFrame) {
     int padX = 16;
     int padY = 16;
 
     int top = padY;
-    int bottom = screenBuffer->height - padY;
+    int bottom = buffer->height - padY;
-    int renderWidth = screenBuffer->width - 2 *padX;
+    int renderWidth = buffer->width - 2 *padX;
 
     real32 pxPerSoundBufferEntry = (real32)renderWidth / (real32)soundOutput->secondaryBufferSize;
-    int pitch = screenBuffer->width*screenBuffer->bytesPerPixel; 
 
+#if 0
     for (int markerIndex = 0; markerIndex < markerCount; markerIndex++) {
         Win32DebugTimeMarker *thisMarker = &markers[markerIndex];
         real32 alpha = ((real32)(markerIndex + 1) / (real32)markerCount);
         int x = padX + (int)(pxPerSoundBufferEntry * (real32)thisMarker->writeCursor);
-        uint8 *pixel = (uint8 *)screenBuffer->memory + top * pitch + x*screenBuffer->bytesPerPixel;
+        uint8 *pixel = (uint8 *)buffer->memory + top * buffer->pitch + x*buffer->bytesPerPixel;
         uint32 newPixel = (uint32)((real32)alpha * 0xFFFFFFFF + (1.0f - alpha) * (*(uint32 *)pixel));
-        win32DrawSoundBufferMarker(screenBuffer, soundOutput, pxPerSoundBufferEntry, padX, top, bottom, thisMarker->playCursor, newPixel);
+        win32DrawSoundBufferMarker(buffer, soundOutput, pxPerSoundBufferEntry, padX, top, bottom, thisMarker->playCursor, newPixel);
-        win32DrawSoundBufferMarker(screenBuffer, soundOutput, pxPerSoundBufferEntry, padX, top, bottom, thisMarker->writeCursor, 0x00FF0000);
+        win32DrawSoundBufferMarker(buffer, soundOutput, pxPerSoundBufferEntry, padX, top, bottom, thisMarker->writeCursor, 0x00FF0000);
     }
+#endif
 }
 
 void catStrings(size_t sourceACount, char *sourceA, size_t sourceBCount, char *sourceB, size_t destCount, char *dest) {
@@ -536,6 +595,8 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
             RegisterHotKey(window, HH_CTRLW, MOD_CONTROL, 'W');
 
             globalRunning = true;
+            Win32State win32State = {};
+
             GameInput input[2] = {};
             GameInput *oldInput = &input[0];
             GameInput *newInput = &input[1];
@@ -568,8 +629,9 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
             gameMemory.debugReadEntireFile = debugReadEntireFile;
             gameMemory.debug_printf = debug_printf;
 
-            uint64 totalSize = gameMemory.permanentStorageSize + gameMemory.transientStorageSize;
+            win32State.gameMemoryTotalSize = gameMemory.permanentStorageSize + gameMemory.transientStorageSize;
-            gameMemory.permanentStorage = VirtualAlloc(baseAddress, totalSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
+            win32State.gameMemoryBlock = VirtualAlloc(baseAddress, win32State.gameMemoryTotalSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
+            gameMemory.permanentStorage = win32State.gameMemoryBlock;
             gameMemory.transientStorage = ((uint8 *)gameMemory.permanentStorage + gameMemory.permanentStorageSize);
 
             win32InitSound(window, soundOutput.samplesPerSecond, soundOutput.secondaryBufferSize);
@@ -602,7 +664,7 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
                     newKeyboardController->buttons[buttonIndex].endedDown = oldKeyboardController->buttons[buttonIndex].endedDown;
                 }
 
-                win32ProcessPendingMessages(newKeyboardController);
+                win32ProcessPendingMessages(&win32State, newKeyboardController);
 
                 XINPUT_STATE controllerState;
                 int maxControllerCount = XUSER_MAX_COUNT;
@@ -670,6 +732,16 @@ int APIENTRY WinMain(HINSTANCE instance, HINSTANCE prevInstance, PSTR commandLin
                 videoBuffer.memory = globalBackBuffer.memory;
                 videoBuffer.width = globalBackBuffer.width;
                 videoBuffer.height = globalBackBuffer.height;
+                videoBuffer.pitch = globalBackBuffer.pitch;
+                videoBuffer.bytesPerPixel = globalBackBuffer.bytesPerPixel;
+
+                if (win32State.inputRecordingIndex) {
+                    win32RecordInput(&win32State, newInput);
+                }
+                if (win32State.inputPlayingIndex) {
+                    win32PlaybackInput(&win32State, newInput);
+                }
+
                 game.updateAndRender(&gameMemory, &videoBuffer, newInput);
 
                 DWORD playCursor = 0;

src/win32_handmade.h

@@ -6,6 +6,7 @@ struct Win32OffscreenBuffer {
     int width;
     int height;
     int bytesPerPixel;
+    int pitch;
 };
 
 struct Win32WindowDimensions {
@@ -27,3 +28,17 @@ struct Win32DebugTimeMarker {
     DWORD playCursor;
     DWORD writeCursor;
 };
+
+struct Win32RecordedInput {
+    int inputCount;
+    GameInput *inputStream;
+};
+
+struct Win32State {
+    HANDLE recordingHandle;
+    uint32 inputRecordingIndex;
+    HANDLE playbackHandle;
+    uint32 inputPlayingIndex;
+    uint64 gameMemoryTotalSize;
+    void *gameMemoryBlock;
+};