ADDED: example: `textures_fog_of_war`

examples/textures/textures_fog_of_war.c

@@ -0,0 +1,152 @@
+/*******************************************************************************************
+*
+*   raylib [textures] example - Fog of war
+*
+*   This example has been created using raylib 4.2 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2018-2022 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include <stdlib.h>                 // Required for: calloc(), free()
+
+#define MAP_TILE_SIZE    32         // Tiles size 32x32 pixels
+#define PLAYER_SIZE      16         // Player size
+#define PLAYER_TILE_VISIBILITY  2   // Player can see 2 tiles around its position 
+
+// Map data type
+typedef struct Map {
+    unsigned int tilesX;            // Number of tiles in X axis
+    unsigned int tilesY;            // Number of tiles in Y axis
+    unsigned char *tileIds;         // Tile ids (tilesX*tilesY), defines type of tile to draw
+    unsigned char *tileFog;         // Tile fog state (tilesX*tilesY), defines if a tile has fog or half-fog
+} Map;
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [textures] example - fog of war");
+   
+    Map map = { 0 };
+    map.tilesX = 25;
+    map.tilesY = 15;
+    
+    // NOTE: We can have up to 256 values for tile ids and for tile fog state,
+    // probably we don't need that many values for fog state, it can be optimized
+    // to use only 2 bits per fog state (reducing size by 4) but logic will be a bit more complex
+    map.tileIds = (unsigned char *)calloc(map.tilesX*map.tilesY, sizeof(unsigned char));
+    map.tileFog = (unsigned char *)calloc(map.tilesX*map.tilesY, sizeof(unsigned char));
+    
+    // Load map tiles (generating 2 random tile ids for testing)
+    // NOTE: Map tile ids should be probably loaded from an external map file
+    for (int i = 0; i < map.tilesY*map.tilesX; i++) map.tileIds[i] = GetRandomValue(0, 1);
+    
+    // Player position on the screen (pixel coordinates, not tile coordinates)
+    Vector2 playerPosition = { 180, 130 };
+    int playerTileX = 0;
+    int playerTileY = 0;
+    
+    // Render texture to render fog of war
+    // NOTE: To get an automatic smooth-fog effect we use a render texture to render fog
+    // at a smaller size (one pixel per tile) and scale it on drawing with bilinear filtering
+    RenderTexture2D fogOfWar = LoadRenderTexture(map.tilesX, map.tilesY);
+    SetTextureFilter(fogOfWar.texture, TEXTURE_FILTER_BILINEAR);
+
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        // Move player around
+        if (IsKeyDown(KEY_RIGHT)) playerPosition.x += 5;
+        if (IsKeyDown(KEY_LEFT)) playerPosition.x -= 5;
+        if (IsKeyDown(KEY_DOWN)) playerPosition.y += 5;
+        if (IsKeyDown(KEY_UP)) playerPosition.y -= 5;
+        
+        // Check player position to avoid moving outside tilemap limits
+        if (playerPosition.x < 0) playerPosition.x = 0;
+        else if ((playerPosition.x + PLAYER_SIZE) > (map.tilesX*MAP_TILE_SIZE)) playerPosition.x = map.tilesX*MAP_TILE_SIZE - PLAYER_SIZE;
+        if (playerPosition.y < 0) playerPosition.y = 0;
+        else if ((playerPosition.y + PLAYER_SIZE) > (map.tilesY*MAP_TILE_SIZE)) playerPosition.y = map.tilesY*MAP_TILE_SIZE - PLAYER_SIZE;
+
+        // Previous visited tiles are set to partial fog
+        for (int i = 0; i < map.tilesX*map.tilesY; i++) if (map.tileFog[i] == 1) map.tileFog[i] = 2;
+        
+        // Get current tile position from player pixel position
+        playerTileX = (int)((playerPosition.x + MAP_TILE_SIZE/2)/MAP_TILE_SIZE);
+        playerTileY = (int)((playerPosition.y + MAP_TILE_SIZE/2)/MAP_TILE_SIZE);
+        
+        // Check visibility and update fog
+        // NOTE: We check tilemap limits to avoid processing tiles out-of-array-bounds (it could crash program)
+        for (int y = (playerTileY - PLAYER_TILE_VISIBILITY); y < (playerTileY + PLAYER_TILE_VISIBILITY); y++)
+            for (int x = (playerTileX - PLAYER_TILE_VISIBILITY); x < (playerTileX + PLAYER_TILE_VISIBILITY); x++)
+                if ((x >= 0) && (x < map.tilesX) && (y >= 0) && (y < map.tilesY)) map.tileFog[y*map.tilesX + x] = 1;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        // Draw fog of war to a small render texture for automatic smoothing on scaling
+        BeginTextureMode(fogOfWar);
+            ClearBackground(BLANK);
+            for (int y = 0; y < map.tilesY; y++)
+                for (int x = 0; x < map.tilesX; x++)
+                    if (map.tileFog[y*map.tilesX + x] == 0) DrawRectangle(x, y, 1, 1, BLACK);
+                    else if (map.tileFog[y*map.tilesX + x] == 2) DrawRectangle(x, y, 1, 1, Fade(BLACK, 0.8f));
+        EndTextureMode();
+        
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+            
+            for (int y = 0; y < map.tilesY; y++)
+            {
+                for (int x = 0; x < map.tilesX; x++)
+                {
+                    // Draw tiles from id (and tile borders)
+                    DrawRectangle(x*MAP_TILE_SIZE, y*MAP_TILE_SIZE, MAP_TILE_SIZE, MAP_TILE_SIZE, 
+                                  (map.tileIds[y*map.tilesX + x] == 0)? BLUE : Fade(BLUE, 0.9f));
+                    DrawRectangleLines(x*MAP_TILE_SIZE, y*MAP_TILE_SIZE, MAP_TILE_SIZE, MAP_TILE_SIZE, Fade(DARKBLUE, 0.5f));
+                }
+            }
+            
+            // Draw player
+            DrawRectangleV(playerPosition, (Vector2){ PLAYER_SIZE, PLAYER_SIZE }, RED);
+            
+            
+            // Draw fog of war (scaled to full map, bilinear filtering)
+            DrawTexturePro(fogOfWar.texture, (Rectangle){ 0, 0, fogOfWar.texture.width, -fogOfWar.texture.height }, 
+                           (Rectangle){ 0, 0, map.tilesX*MAP_TILE_SIZE, map.tilesY*MAP_TILE_SIZE }, 
+                           (Vector2){ 0, 0 }, 0.0f, WHITE);
+            
+            // Draw player current tile
+            DrawText(TextFormat("Current tile: [%i,%i]", playerTileX, playerTileY), 10, 10, 20, LIME);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    free(map.tileIds);      // Free allocated map tile ids
+    free(map.tileFog);      // Free allocated map tile fog state
+
+    UnloadRenderTexture(fogOfWar);  // Unload render texture
+    
+    CloseWindow();          // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}

projects/VS2022/examples/textures_fog_of_war.vcxproj

@@ -0,0 +1,387 @@
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+      <AdditionalIncludeDirectories>$(SolutionDir)..\..\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <CompileAs>CompileAsC</CompileAs>
+      <RemoveUnreferencedCodeData>true</RemoveUnreferencedCodeData>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>raylib.lib;opengl32.lib;kernel32.lib;user32.lib;gdi32.lib;winmm.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalLibraryDirectories>$(SolutionDir)\build\raylib\bin\$(Platform)\$(Configuration)\</AdditionalLibraryDirectories>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release.DLL|Win32'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions);PLATFORM_DESKTOP</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$(SolutionDir)..\..\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <CompileAs>CompileAsC</CompileAs>
+      <RemoveUnreferencedCodeData>true</RemoveUnreferencedCodeData>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>raylib.lib;opengl32.lib;kernel32.lib;user32.lib;gdi32.lib;winmm.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalLibraryDirectories>$(SolutionDir)\build\raylib\bin\$(Platform)\$(Configuration)\</AdditionalLibraryDirectories>
+    </Link>
+    <PostBuildEvent>
+      <Command>xcopy /y /d  "$(SolutionDir)\build\raylib\bin\$(Platform)\$(Configuration)\raylib.dll" "$(SolutionDir)\build\$(ProjectName)\bin\$(Platform)\$(Configuration)"</Command>
+    </PostBuildEvent>
+    <PostBuildEvent>
+      <Message>Copy Release DLL to output directory</Message>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release.DLL|x64'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <PrecompiledHeader>
+      </PrecompiledHeader>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions);PLATFORM_DESKTOP</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$(SolutionDir)..\..\src;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <CompileAs>CompileAsC</CompileAs>
+      <RemoveUnreferencedCodeData>true</RemoveUnreferencedCodeData>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>raylib.lib;opengl32.lib;kernel32.lib;user32.lib;gdi32.lib;winmm.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalLibraryDirectories>$(SolutionDir)\build\raylib\bin\$(Platform)\$(Configuration)\</AdditionalLibraryDirectories>
+    </Link>
+    <PostBuildEvent>
+      <Command>xcopy /y /d  "$(SolutionDir)\build\raylib\bin\$(Platform)\$(Configuration)\raylib.dll" "$(SolutionDir)\build\$(ProjectName)\bin\$(Platform)\$(Configuration)"</Command>
+    </PostBuildEvent>
+    <PostBuildEvent>
+      <Message>Copy Release DLL to output directory</Message>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClCompile Include="..\..\..\examples\textures\textures_fog_of_war.c" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\raylib\raylib.vcxproj">
+      <Project>{e89d61ac-55de-4482-afd4-df7242ebc859}</Project>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+  </ImportGroup>
+</Project>

projects/VS2022/raylib.sln

@@ -249,6 +249,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "text_codepoints_loading", "
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "core_window_should_close", "examples\core_window_should_close.vcxproj", "{3FE7E9B6-49AC-4246-A789-28DB4644567B}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "textures_fog_of_war", "examples\textures_fog_of_war.vcxproj", "{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug.DLL|x64 = Debug.DLL|x64
@@ -2081,6 +2083,22 @@ Global
 		{3FE7E9B6-49AC-4246-A789-28DB4644567B}.Release|x64.Build.0 = Release|x64
 		{3FE7E9B6-49AC-4246-A789-28DB4644567B}.Release|x86.ActiveCfg = Release|Win32
 		{3FE7E9B6-49AC-4246-A789-28DB4644567B}.Release|x86.Build.0 = Release|Win32
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Debug.DLL|x64.ActiveCfg = Debug.DLL|x64
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Debug.DLL|x64.Build.0 = Debug.DLL|x64
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Debug.DLL|x86.ActiveCfg = Debug.DLL|Win32
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Debug.DLL|x86.Build.0 = Debug.DLL|Win32
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Debug|x64.ActiveCfg = Debug|x64
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Debug|x64.Build.0 = Debug|x64
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Debug|x86.ActiveCfg = Debug|Win32
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Debug|x86.Build.0 = Debug|Win32
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Release.DLL|x64.ActiveCfg = Release.DLL|x64
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Release.DLL|x64.Build.0 = Release.DLL|x64
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Release.DLL|x86.ActiveCfg = Release.DLL|Win32
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Release.DLL|x86.Build.0 = Release.DLL|Win32
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Release|x64.ActiveCfg = Release|x64
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Release|x64.Build.0 = Release|x64
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Release|x86.ActiveCfg = Release|Win32
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0}.Release|x86.Build.0 = Release|Win32
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -2207,6 +2225,7 @@ Global
 		{F5FC9279-DE63-4EF3-B31F-CFCEF9B11F71} = {AF5BEC5C-1F2B-4DA8-B12D-D09FE569237C}
 		{F2DB2E59-76BF-4D81-859A-AFC289C046C0} = {8D3C83B7-F1E0-4C2E-9E34-EE5F6AB2502A}
 		{3FE7E9B6-49AC-4246-A789-28DB4644567B} = {6C82BAAE-BDDF-457D-8FA8-7E2490B07035}
+		{EBBBF4A0-2DA2-4DE6-B4FE-C6654A2417A0} = {DA049009-21FF-4AC0-84E4-830DD1BCD0CE}
 	EndGlobalSection
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