Reviewed examples

examples/core/core_smooth_pixelperfect.c

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+/*******************************************************************************************
+*
+*   raylib [core] example - smooth pixel-perfect camera
+*
+*   This example has been created using raylib 3.7 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Example contributed by Giancamillo Alessandroni (@NotManyIdeasDev) and
+*   reviewed by Ramon Santamaria (@raysan5)
+*
+*   Copyright (c) 2021 Giancamillo Alessandroni (@NotManyIdeasDev) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include <math.h>       // Required for: sinf(), cosf()
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    const int virtualScreenWidth = 160;
+    const int virtualScreenHeight = 90;
+
+    const float virtualRatio = (float)screenWidth/(float)virtualScreenWidth;
+
+    InitWindow(screenWidth, screenHeight, "raylib [core] example - smooth pixel-perfect camera");
+
+    Camera2D worldSpaceCamera = { 0 };  // Game world camera
+    worldSpaceCamera.zoom = 1.0f;
+
+    Camera2D screenSpaceCamera = { 0 }; // Smoothing camera
+    screenSpaceCamera.zoom = 1.0f;
+
+    RenderTexture2D target = LoadRenderTexture(virtualScreenWidth, virtualScreenHeight); // This is where we'll draw all our objects.
+
+    Rectangle rec01 = { 70.0f, 35.0f, 20.0f, 20.0f };
+    Rectangle rec02 = { 90.0f, 55.0f, 30.0f, 10.0f };
+    Rectangle rec03 = { 80.0f, 65.0f, 15.0f, 25.0f };
+
+    // The target's height is flipped (in the source Rectangle), due to OpenGL reasons
+    Rectangle sourceRec = { 0.0f, 0.0f, (float)target.texture.width, -(float)target.texture.height };
+    Rectangle destRec = { -virtualRatio, -virtualRatio, screenWidth + (virtualRatio*2), screenHeight + (virtualRatio*2) };
+
+    Vector2 origin = { 0.0f, 0.0f };
+
+    float rotation = 0.0f;
+
+    float cameraX = 0.0f;
+    float cameraY = 0.0f;
+
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        rotation += 60.0f*GetFrameTime();   // Rotate the rectangles, 60 degrees per second
+
+        // Make the camera move to demonstrate the effect
+        cameraX = (sinf(GetTime())*50.0f) - 10.0f;
+        cameraY = cosf(GetTime())*30.0f;
+
+        // Set the camera's target to the values computed above
+        screenSpaceCamera.target = (Vector2){ cameraX, cameraY };
+
+        // Round worldSpace coordinates, keep decimals into screenSpace coordinates
+        worldSpaceCamera.target.x = (int)screenSpaceCamera.target.x;
+        screenSpaceCamera.target.x -= worldSpaceCamera.target.x;
+        screenSpaceCamera.target.x *= virtualRatio;
+
+        worldSpaceCamera.target.y = (int)screenSpaceCamera.target.y;
+        screenSpaceCamera.target.y -= worldSpaceCamera.target.y;
+        screenSpaceCamera.target.y *= virtualRatio;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginTextureMode(target);
+            ClearBackground(RAYWHITE);
+            
+            BeginMode2D(worldSpaceCamera);
+                DrawRectanglePro(rec01, origin, rotation, BLACK);
+                DrawRectanglePro(rec02, origin, -rotation, RED);
+                DrawRectanglePro(rec03, origin, rotation + 45.0f, BLUE);
+            EndMode2D();
+        EndTextureMode();
+            
+        BeginDrawing();
+            ClearBackground(RED);
+
+            BeginMode2D(screenSpaceCamera);
+                DrawTexturePro(target.texture, sourceRec, destRec, origin, 0.0f, WHITE);
+            EndMode2D();
+
+            DrawText(TextFormat("Screen resolution: %ix%i", screenWidth, screenHeight), 10, 10, 20, DARKBLUE);
+            DrawText(TextFormat("World resolution: %ix%i", virtualScreenWidth, virtualScreenHeight), 10, 40, 20, DARKGREEN);
+            DrawFPS(GetScreenWidth() - 95, 10);
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadRenderTexture(target);    // Unload render texture
+    
+    CloseWindow();                  // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}