Half of day 39 complete.

handmade.c

@@ -84,8 +84,11 @@ static void DrawRectangle(game_offscreen_buffer *Buffer, F32 RealMinX, F32 RealM
     }
 }
 
-static void DrawBitmap(game_offscreen_buffer *Buffer, loaded_bitmap *Bitmap, F32 RelX, F32 RelY)
+static void DrawBitmap(game_offscreen_buffer *Buffer, loaded_bitmap *Bitmap, F32 RelX, F32 RelY, S32 AlignX, S32 AlignY)
 {
+    RelX -= (F32)AlignX;
+    RelY -= (F32)AlignY;
+
     S32 MinX = RoundF32toS32(RelX);
     S32 MinY = RoundF32toS32(RelY);
     S32 MaxX = RoundF32toS32(RelX + (F32)Bitmap->Width);
@@ -112,12 +115,12 @@ static void DrawBitmap(game_offscreen_buffer *Buffer, loaded_bitmap *Bitmap, F32
         for(S32 X = MinX; X < MaxX; X++) {
             F32 A  = (F32)((*Source >> 24) & 0xFF) / 255.0f;
             F32 SR = (F32)((*Source >> 16) & 0xFF);
-            F32 SG = (F32)((*Source >> 8) & 0xFF);
-            F32 SB = (F32)((*Source >> 0) & 0xFF);
+            F32 SG = (F32)((*Source >>  8) & 0xFF);
+            F32 SB = (F32)((*Source >>  0) & 0xFF);
 
             F32 DR = (F32)((*Dest >> 16) & 0xFF);
-            F32 DG = (F32)((*Dest >> 8) & 0xFF);
-            F32 DB = (F32)((*Dest >> 0) & 0xFF);
+            F32 DG = (F32)((*Dest >>  8) & 0xFF);
+            F32 DB = (F32)((*Dest >>  0) & 0xFF);
 
             // TODO: This should be replaced by premultiplied alpha.
             F32 R = (1.0f-A)*DR + A*SR;
@@ -186,7 +189,7 @@ static loaded_bitmap DEBUGLoadBMP(thread_context *Thread, debug_read_file_result
         bit_scan_result GreenShift = FindLeastSignificantSetBit(GreenMask);
         bit_scan_result BlueShift  = FindLeastSignificantSetBit(BlueMask);
         bit_scan_result AlphaShift = FindLeastSignificantSetBit(AlphaMask);
-
+  
         ASSERT(RedShift.Found);
         ASSERT(GreenShift.Found);
         ASSERT(BlueShift.Found);
@@ -200,7 +203,8 @@ static loaded_bitmap DEBUGLoadBMP(thread_context *Thread, debug_read_file_result
                 *SourceDest = ((((C >> AlphaShift.Index) & 0xFF) << 24) |
                                (((C >> RedShift.Index  ) & 0xFF) << 16) |
                                (((C >> GreenShift.Index) & 0xFF) <<  8) |
-                               (((C >> BlueShift.Index ) & 0xFF) <<  8));
+                               (((C >> BlueShift.Index ) & 0xFF) <<  0));
+                SourceDest++;
             }
         }
     }
@@ -224,10 +228,40 @@ void UpdateAndRender(thread_context *Thread, game_memory *Memory, game_input *In
 
     GameState = (game_state *)Memory->PermanentStorage;
     if(!Memory->IsInitialized) {
-        GameState->Backdrop  = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/background.bmp");
-        GameState->HeroHead  = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/hero_head_front.bmp");;
-        GameState->HeroCape  = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/hero_cape_front.bmp");;
-        GameState->HeroTorso = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/hero_torso_front.bmp");;
+        GameState->Backdrop  = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_background.bmp");
+
+        hero_bitmaps *Bitmap;
+
+        Bitmap = &GameState->HeroBitmaps[0];
+        Bitmap->AlignX = 72;
+        Bitmap->AlignY = 182;
+        Bitmap->Head   = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_right_head.bmp");
+        Bitmap->Cape   = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_right_cape.bmp");
+        Bitmap->Torso  = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_right_torso.bmp");
+        Bitmap++;
+
+        Bitmap->AlignX = 72;
+        Bitmap->AlignY = 182;
+        Bitmap->Head   = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_back_head.bmp");
+        Bitmap->Cape   = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_back_cape.bmp");
+        Bitmap->Torso  = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_back_torso.bmp");
+        Bitmap++;
+
+        Bitmap->AlignX = 72;
+        Bitmap->AlignY = 182;
+        Bitmap->Head   = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_left_head.bmp");
+        Bitmap->Cape   = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_left_cape.bmp");
+        Bitmap->Torso  = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_left_torso.bmp");
+        Bitmap++;
+
+        Bitmap->AlignX = 72;
+        Bitmap->AlignY = 182;
+        Bitmap->Head   = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_front_head.bmp");
+        Bitmap->Cape   = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_front_cape.bmp");
+        Bitmap->Torso  = DEBUGLoadBMP(Thread, Memory->DEBUGPlatformReadEntireFile, "data/test_hero_front_torso.bmp");
+
+        GameState->CameraP.AbsTileX = 17 / 2;
+        GameState->CameraP.AbsTileY = 9 / 2;
 
         GameState->PlayerP.AbsTileX = 2;
         GameState->PlayerP.AbsTileY = 3;
@@ -376,15 +410,19 @@ void UpdateAndRender(thread_context *Thread, game_memory *Memory, game_input *In
 
             if(Controller->MoveUp.EndedDown) {
                 dPlayerY = 1.0f;
+                GameState->FacingDirection = 1;
             }
             if(Controller->MoveDown.EndedDown) {
                 dPlayerY = -1.0f;
+                GameState->FacingDirection = 3;
             }
             if(Controller->MoveLeft.EndedDown) {
                 dPlayerX = -1.0f;
+                GameState->FacingDirection = 2;
             }
             if(Controller->MoveRight.EndedDown) {
                 dPlayerX = 1.0f;
+                GameState->FacingDirection = 0;
             }
 
             F32 PlayerSpeed = 2.0f;
@@ -428,17 +466,17 @@ void UpdateAndRender(thread_context *Thread, game_memory *Memory, game_input *In
 
     DrawRectangle(Buffer, 0.0f, 0.0f, (F32)Buffer->Width, (F32)Buffer->Height, 0.0f, 1.0f, 0.0f);
 
-    DrawBitmap(Buffer, &GameState->Backdrop, 0.0f, 0.0f);
+    DrawBitmap(Buffer, &GameState->Backdrop, 0.0f, 0.0f, 0, 0);
 
     F32 ScreenCenterX = 0.5f * (F32)Buffer->Width;
     F32 ScreenCenterY = 0.5f * (F32)Buffer->Height;
 
     for(S32 RelRow = -10; RelRow < 10; RelRow++) {
         for(S32 RelColumn = -20; RelColumn < 20; RelColumn++) {
-            U32 Column = GameState->PlayerP.AbsTileX + RelColumn;
-            U32 Row    = GameState->PlayerP.AbsTileY + RelRow;
+            U32 Column = GameState->CameraP.AbsTileX + RelColumn;
+            U32 Row    = GameState->CameraP.AbsTileY + RelRow;
 
-            U32 TileID = GetTileValue(TileMap, Column, Row, GameState->PlayerP.AbsTileZ);
+            U32 TileID = GetTileValue(TileMap, Column, Row, GameState->CameraP.AbsTileZ);
 
             if(TileID > 1) {
                 F32 Gray = 0.5f;
@@ -450,13 +488,13 @@ void UpdateAndRender(thread_context *Thread, game_memory *Memory, game_input *In
                     Gray = 0.25f;
                 }
 
-                if((Column == GameState->PlayerP.AbsTileX) && (Row == GameState->PlayerP.AbsTileY)) {
+                if((Column == GameState->CameraP.AbsTileX) && (Row == GameState->CameraP.AbsTileY)) {
                     Gray = 0.0f;
                 }
 
 
-                F32 CenterX = ScreenCenterX - MetersToPixels*GameState->PlayerP.OffsetX + (F32)RelColumn*(F32)TileSideInPixels;
-                F32 CenterY = ScreenCenterY + MetersToPixels*GameState->PlayerP.OffsetY - (F32)RelRow*(F32)TileSideInPixels;
+                F32 CenterX = ScreenCenterX - MetersToPixels*GameState->CameraP.OffsetX + (F32)RelColumn*(F32)TileSideInPixels;
+                F32 CenterY = ScreenCenterY + MetersToPixels*GameState->CameraP.OffsetY - (F32)RelRow*(F32)TileSideInPixels;
                 F32 MinX = CenterX - 0.5f*(F32)TileSideInPixels;
                 F32 MinY = CenterY - 0.5f*(F32)TileSideInPixels;
                 F32 MaxX = CenterX + 0.5f*(F32)TileSideInPixels;
@@ -466,13 +504,21 @@ void UpdateAndRender(thread_context *Thread, game_memory *Memory, game_input *In
         }
     }
 
+    tile_map_difference Diff = SubtractInF32(TileMap, &GameState->PlayerP, &GameState->CameraP);
+
     F32 PlayerR = 1.0f;
     F32 PlayerG = 0.0f;
     F32 PlayerB = 0.0f;
-    F32 PlayerLeft = ScreenCenterX - 0.5f * MetersToPixels*PlayerWidth;
-    F32 PlayerTop = ScreenCenterY - MetersToPixels*PlayerHeight;
+    F32 PlayerGroundPointX = ScreenCenterX + MetersToPixels*Diff.dX;
+    F32 PlayerGroundPointY = ScreenCenterY + MetersToPixels*Diff.dY;
+    F32 PlayerLeft = PlayerGroundPointX - 0.5f * MetersToPixels*PlayerWidth;
+    F32 PlayerTop = PlayerGroundPointY - MetersToPixels*PlayerHeight;
     DrawRectangle(Buffer, PlayerLeft, PlayerTop, PlayerLeft + MetersToPixels*PlayerWidth, PlayerTop + MetersToPixels*PlayerHeight, PlayerR, PlayerG, PlayerB);
-    DrawBitmap(Buffer, &GameState->HeroHead, PlayerLeft, PlayerTop);
+
+    hero_bitmaps *Bitmap = &GameState->HeroBitmaps[GameState->FacingDirection];
+    DrawBitmap(Buffer, &Bitmap->Torso, PlayerGroundPointX, PlayerGroundPointY, Bitmap->AlignX, Bitmap->AlignY);
+    DrawBitmap(Buffer, &Bitmap->Cape, PlayerGroundPointX, PlayerGroundPointY, Bitmap->AlignX, Bitmap->AlignY);
+    DrawBitmap(Buffer, &Bitmap->Head, PlayerGroundPointX, PlayerGroundPointY, Bitmap->AlignX, Bitmap->AlignY);
 
     GameOutputSound(GameState, SoundBuffer, 400);
 }

handmade.h

@@ -18,11 +18,8 @@ typedef struct debug_read_file_result {
 	void *Contents;
 } debug_read_file_result;
 
-debug_read_file_result DEBUGPlatformReadEntireFile(thread_context *Thread,
-                                                   const char *Filename);
-B32 DEBUGPlatformWriteEntireFile(thread_context *Thread,
-                                 const char *Filename, U32 MemorySize,
-                                 void *Memory);
+debug_read_file_result DEBUGPlatformReadEntireFile(thread_context *Thread, const char *Filename);
+B32 DEBUGPlatformWriteEntireFile(thread_context *Thread, const char *Filename, U32 MemorySize, void *Memory);
 void DEBUGPlatformFreeFileMemory(thread_context *Thread, void *Memory);
 #endif
 
@@ -171,17 +168,26 @@ typedef struct loaded_bitmap {
     U32 *Pixels;
 } loaded_bitmap;
 
+typedef struct hero_bitmaps {
+    S32 AlignX;
+    S32 AlignY;
+
+    loaded_bitmap Head;
+    loaded_bitmap Cape;
+    loaded_bitmap Torso;
+} hero_bitmaps;
+
 typedef struct game_state {
     memory_arena WorldArena;
     world *World;
 
+    tile_map_position CameraP;
     tile_map_position PlayerP;
 
     loaded_bitmap Backdrop;
 
-    loaded_bitmap HeroHead;
-    loaded_bitmap HeroCape;
-    loaded_bitmap HeroTorso;
+    U32 FacingDirection;
+    hero_bitmaps HeroBitmaps[4];
 } game_state;
 
 #endif

handmade_tile.c

@@ -135,3 +135,20 @@ static B32 AreOnSameTile(tile_map_position *A, tile_map_position *B)
     B32 Result = ((A->AbsTileX == B->AbsTileX) && (A->AbsTileY == B->AbsTileY) && (A->AbsTileZ == B->AbsTileZ));
     return Result;
 }
+
+static tile_map_difference SubtractInF32(tile_map *TileMap, tile_map_position *A, tile_map_position *B)
+{
+    tile_map_difference Result;
+
+    F32 dTileX = (F32)A->AbsTileX - (F32)B->AbsTileY;
+    F32 dTileY = (F32)A->AbsTileX - (F32)B->AbsTileY;
+    F32 dTileZ = (F32)A->AbsTileX - (F32)B->AbsTileY;
+
+    Result.dX = TileMap->TileSideInMeters*dTileX + (A->OffsetX - B->OffsetX);
+    Result.dY = TileMap->TileSideInMeters*dTileY + (A->OffsetY - B->OffsetY);
+
+    // TODO: Incomplete . . .
+    Result.dZ = TileMap->TileSideInMeters*dTileZ;
+
+    return Result;
+}

handmade_tile.h

@@ -1,6 +1,12 @@
 #ifndef HANDMADE_TILE_H_SENTRY
 #define HANDMADE_TILE_H_SENTRY
 
+typedef struct tile_map_difference {
+    F32 dX;
+    F32 dY;
+    F32 dZ;
+} tile_map_difference;
+
 typedef struct tile_map_position {
     U32 AbsTileX;
     U32 AbsTileY;