raylib/examples/textures_raw_data.c

/*******************************************************************************************
*
*   raylib [textures] example - Load textures from raw data
*
*   NOTE: Images are loaded in CPU memory (RAM); textures are loaded in GPU memory (VRAM)
*
*   This example has been created using raylib 1.3 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2015 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "raylib.h"

#include <stdlib.h>     // Required for malloc() and free()

int main()
{
    // Initialization
    //--------------------------------------------------------------------------------------
    int screenWidth = 800;
    int screenHeight = 450;

    InitWindow(screenWidth, screenHeight, "raylib [textures] example - texture from raw data");

    // NOTE: Textures MUST be loaded after Window initialization (OpenGL context is required)
 
    // Load RAW image data (512x512, 32bit RGBA, no file header)
    Image sonicRaw = LoadImageRaw("resources/texture_formats/sonic_R8G8B8A8.raw", 512, 512, UNCOMPRESSED_R8G8B8A8, 0);
    Texture2D sonic = LoadTextureFromImage(sonicRaw);   // Upload CPU (RAM) image to GPU (VRAM)
    UnloadImage(sonicRaw);                              // Unload CPU (RAM) image data
    
    // Generate a checked texture by code (1024x1024 pixels)
    int width = 1024;
    int height = 1024;
    
    // Dynamic memory allocation to store pixels data (Color type)
    Color *pixels = (Color *)malloc(width*height*sizeof(Color));
    
    for (int y = 0; y < height; y++)
    {
        for (int x = 0; x < width; x++)
        {
            if (((x/32+y/32)/1)%2 == 0) pixels[y*height + x] = DARKBLUE;
            else pixels[y*height + x] = SKYBLUE;
        }
    }
    
    // Load pixels data into an image structure and create texture
    Image checkedIm = LoadImageEx(pixels, width, height);
    Texture2D checked = LoadTextureFromImage(checkedIm);
    UnloadImage(checkedIm);     // Unload CPU (RAM) image data
    
    // Dynamic memory must be freed after using it
    free(pixels);               // Unload CPU (RAM) pixels data
    //---------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        // TODO: Update your variables here
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

            ClearBackground(RAYWHITE);

            DrawTexture(checked, screenWidth/2 - checked.width/2, screenHeight/2 - checked.height/2, Fade(WHITE, 0.3f));
            DrawTexture(sonic, 330, -20, WHITE);

            DrawText("CHECKED TEXTURE ", 84, 100, 30, DARKBLUE);
            DrawText("GENERATED by CODE", 72, 164, 30, DARKBLUE);
            DrawText("and RAW IMAGE LOADING", 46, 226, 30, DARKBLUE);

        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------
    UnloadTexture(sonic);       // Texture unloading
    UnloadTexture(checked);     // Texture unloading

    CloseWindow();              // Close window and OpenGL context
    //--------------------------------------------------------------------------------------

    return 0;
}