Added sprite animation example

examples/textures_sprite_anim.c

@@ -0,0 +1,125 @@
+/*******************************************************************************************
+*
+*   raylib [textures] example - Sprite animation
+*
+*   Example originally created with raylib 1.3, last time updated with raylib 1.3
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2014-2024 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+void raylib_js_set_entry(void (*entry)(void));
+
+#define MAX_FRAME_SPEED     15
+#define MIN_FRAME_SPEED      1
+const int screenWidth = 800;
+const int screenHeight = 450;
+
+// NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+Texture2D scarfy;
+
+Vector2 position;
+Rectangle frameRec;
+int currentFrame = 0;
+int framesCounter = 0;
+int framesSpeed = 8;            // Number of spritesheet frames shown by second
+
+void GameFrame()
+{
+    // Update
+    //----------------------------------------------------------------------------------
+    framesCounter++;
+
+    if (framesCounter >= (60/framesSpeed))
+    {
+        framesCounter = 0;
+        currentFrame++;
+
+        if (currentFrame > 5) currentFrame = 0;
+
+        frameRec.x = (float)currentFrame*(float)scarfy.width/6;
+    }
+
+    // Control frames speed
+    if (IsKeyPressed(KEY_RIGHT)) framesSpeed++;
+    else if (IsKeyPressed(KEY_LEFT)) framesSpeed--;
+
+    if (framesSpeed > MAX_FRAME_SPEED) framesSpeed = MAX_FRAME_SPEED;
+    else if (framesSpeed < MIN_FRAME_SPEED) framesSpeed = MIN_FRAME_SPEED;
+    //----------------------------------------------------------------------------------
+
+    // Draw
+    //----------------------------------------------------------------------------------
+    BeginDrawing();
+
+        ClearBackground(RAYWHITE);
+
+        DrawTexture(scarfy, 15, 40, WHITE);
+        DrawRectangleLines(15, 40, scarfy.width, scarfy.height, LIME);
+        DrawRectangleLines(15 + (int)frameRec.x, 40 + (int)frameRec.y, (int)frameRec.width, (int)frameRec.height, RED);
+
+        DrawText("FRAME SPEED: ", 165, 210, 10, DARKGRAY);
+        DrawText(TextFormat("%02i FPS", framesSpeed), 575, 210, 10, DARKGRAY);
+        DrawText("PRESS RIGHT/LEFT KEYS to CHANGE SPEED!", 290, 240, 10, DARKGRAY);
+
+        for (int i = 0; i < MAX_FRAME_SPEED; i++)
+        {
+            if (i < framesSpeed) DrawRectangle(250 + 21*i, 205, 20, 20, RED);
+            DrawRectangleLines(250 + 21*i, 205, 20, 20, MAROON);
+        }
+
+        DrawTextureRec(scarfy, frameRec, position, WHITE);  // Draw part of the texture
+
+        DrawText("(c) Scarfy sprite by Eiden Marsal", screenWidth - 200, screenHeight - 20, 10, GRAY);
+
+    EndDrawing();
+    //----------------------------------------------------------------------------------
+}
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    InitWindow(screenWidth, screenHeight, "raylib [texture] example - sprite anim");
+
+    // NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
+    scarfy = LoadTexture("resources/scarfy.png");        // Texture loading
+
+    position = (Vector2){ 350.0f, 280.0f };
+    frameRec = (Rectangle){ 0.0f, 0.0f, (float)scarfy.width/6, (float)scarfy.height };
+    currentFrame = 0;
+
+    framesCounter = 0;
+    framesSpeed = 8;            // Number of spritesheet frames shown by second
+
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+#ifdef PLATFORM_WEB
+    raylib_js_set_entry(GameFrame);
+#else
+    // Main game loop
+    while (!WindowShouldClose())
+    {
+        GameFrame();
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadTexture(scarfy);       // Texture unloading
+
+
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+#endif
+
+    return 0;
+}

index.html

@@ -71,7 +71,8 @@
             "core": ["core_basic_window", "core_basic_screen_manager", "core_input_keys", "core_input_mouse_wheel",],
             "shapes": ["shapes_colors_palette"],
             "text": ["text_writing_anim"],
-            "textures": ["textures_logo_raylib"],
+            "textures": ["textures_logo_raylib","texture_sprite_anim"],
+            "camera": ["2d_camera_platformer"],
         }
         const defaultWasm = Object.values(wasmPaths)[0][0];
 

raylib.js

@@ -248,7 +248,15 @@ class RaylibJs {
         this.ctx.fillStyle = color;
         this.ctx.fillRect(x, y, w, h);
     }
-
+    DrawRectangleLines(x, y, w, h, color_ptr) {
+        const buffer = this.wasm.instance.exports.memory.buffer;
+        const color = getColorFromMemory(buffer, color_ptr);
+        const lineThick = 2;
+        this.ctx.strokeStyle = color;
+        this.ctx.lineWidth = lineThick;
+        this.ctx.strokeRect(x + lineThick/2, y + lineThick/2, w - lineThick, h - lineThick);
+    }
+
     DrawRectangleLinesEx(rec_ptr, lineThick, color_ptr) {
         const buffer = this.wasm.instance.exports.memory.buffer;
         const [x, y, w, h] = new Float32Array(buffer, rec_ptr, 4);
@@ -285,15 +293,22 @@ class RaylibJs {
         const buffer = this.wasm.instance.exports.memory.buffer;
         const filename = cstr_by_ptr(buffer, filename_ptr);
 
-        var result = new Uint32Array(buffer, result_ptr, 5)
-        var img = new Image();
+        const result = new Uint32Array(buffer, result_ptr, 5)
+        const img = new Image();
         img.src = filename;
+
+        //wait for the image to load, busy loop no idea what the correct solution would be
+        let maxWait = 1000;
+        while(maxWait >= 0)
+            maxWait--;       
+
+        console.log("image loaded", filename, img.width, img.height);
         this.images.push(img);
 
         result[0] = this.images.indexOf(img);
-        // TODO: get the true width and height of the image
-        result[1] = 256; // width
-        result[2] = 256; // height
+        // TODO: get the true width and height of the image because it sometimes isnt loaded yet a refresh helps because it's cached
+        result[1] = img.width || 256; // width
+        result[2] = img.height || 256; // height
         result[3] = 1; // mipmaps
         result[4] = 7; // format PIXELFORMAT_UNCOMPRESSED_R8G8B8A8
 
@@ -309,6 +324,16 @@ class RaylibJs {
 
         this.ctx.drawImage(this.images[id], posX, posY);
     }
+    //void DrawTextureRec(Texture2D texture, Rectangle source, Vector2 position, Color tint)
+    DrawTextureRec(texture_ptr, rec_ptr, position_ptr, colr_ptr) {
+        const buffer = this.wasm.instance.exports.memory.buffer;
+        const [id, width, height, mipmaps, format] = new Uint32Array(buffer, texture_ptr, 5);
+        const [x, y, w, h] = new Float32Array(buffer, rec_ptr, 4);
+        const [px, py] = new Float32Array(buffer, position_ptr, 2);
+
+        this.ctx.drawImage(this.images[id], x, y, w, h, px, py, w, h);
+
+    }
 
     // TODO: codepoints are not implemented
     LoadFontEx(result_ptr, fileName_ptr/*, fontSize, codepoints, codepointCount*/) {