raylib/docs/examples/web/shaders_standard_lighting.c

/*******************************************************************************************
*
*   raylib [shaders] example - Standard lighting (materials and lights)
*
*   NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
*         OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
*
*   NOTE: Shaders used in this example are #version 330 (OpenGL 3.3), to test this example
*         on OpenGL ES 2.0 platforms (Android, Raspberry Pi, HTML5), use #version 100 shaders
*         raylib comes with shaders ready for both versions, check raylib/shaders install folder
*
*   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) 2016 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "raylib.h"

#if defined(PLATFORM_WEB)
    #include <emscripten/emscripten.h>
#endif

//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
int screenWidth = 800;
int screenHeight = 450;

// Define the camera to look into our 3d world
Camera camera = {{ 4.0f, 4.0f, 4.0f }, { 0.0f, 1.5f, 0.0f }, { 0.0f, 1.0f, 0.0f }, 45.0f };
Vector3 position = { 0.0f, 0.0f, 0.0f };   // Set model position

Model dwarf;
Material material;

Light spotLight;
Light dirLight;
Light pointLight;
    
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void);     // Update and Draw one frame

//----------------------------------------------------------------------------------
// Main Enry Point
//----------------------------------------------------------------------------------
int main()
{
    // Initialization
    //--------------------------------------------------------------------------------------
    SetConfigFlags(FLAG_MSAA_4X_HINT);      // Enable Multi Sampling Anti Aliasing 4x (if available)
    InitWindow(screenWidth, screenHeight, "raylib [shaders] example - model shader");
   
    dwarf = LoadModel("resources/model/dwarf.obj");                     // Load OBJ model
    material = LoadStandardMaterial();
    
    material.texDiffuse = LoadTexture("resources/model/dwarf_diffuse.png");   // Load model diffuse texture
    material.texNormal = LoadTexture("resources/model/dwarf_normal.png");     // Load model normal texture
    material.texSpecular = LoadTexture("resources/model/dwarf_specular.png"); // Load model specular texture
    material.colDiffuse = WHITE;
    material.colAmbient = (Color){0, 0, 10, 255};
    material.colSpecular = WHITE;
    material.glossiness = 50.0f;
    
    dwarf.material = material;      // Apply material to model

    spotLight = CreateLight(LIGHT_SPOT, (Vector3){3.0f, 5.0f, 2.0f}, (Color){255, 255, 255, 255});
    spotLight->target = (Vector3){0.0f, 0.0f, 0.0f};
    spotLight->intensity = 2.0f;
    spotLight->diffuse = (Color){255, 100, 100, 255};
    spotLight->coneAngle = 60.0f;

    dirLight = CreateLight(LIGHT_DIRECTIONAL, (Vector3){0.0f, -3.0f, -3.0f}, (Color){255, 255, 255, 255});
    dirLight->target = (Vector3){1.0f, -2.0f, -2.0f};
    dirLight->intensity = 2.0f;
    dirLight->diffuse = (Color){100, 255, 100, 255};

    pointLight = CreateLight(LIGHT_POINT, (Vector3){0.0f, 4.0f, 5.0f}, (Color){255, 255, 255, 255});
    pointLight->intensity = 2.0f;
    pointLight->diffuse = (Color){100, 100, 255, 255};
    pointLight->radius = 3.0f;

    // Setup orbital camera
    SetCameraMode(CAMERA_ORBITAL);          // Set an orbital camera mode
    SetCameraPosition(camera.position);     // Set internal camera position to match our camera position
    SetCameraTarget(camera.target);         // Set internal camera target to match our camera target

#if defined(PLATFORM_WEB)
    emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
#else
    SetTargetFPS(60);   // Set our game to run at 60 frames-per-second
    //--------------------------------------------------------------------------------------
    
    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        UpdateDrawFrame();
    }
#endif

    // De-Initialization
    //--------------------------------------------------------------------------------------
    UnloadMaterial(material);   // Unload material and assigned textures
    UnloadModel(dwarf);         // Unload model
    
    // Destroy all created lights
    DestroyLight(pointLight);
    DestroyLight(dirLight);
    DestroyLight(spotLight);

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

    return 0;
}

//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
void UpdateDrawFrame(void)
{
    // Update
    //----------------------------------------------------------------------------------
    UpdateCamera(&camera);              // Update internal camera and our camera
    //----------------------------------------------------------------------------------

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

        ClearBackground(RAYWHITE);

        Begin3dMode(camera);
            
            DrawModel(dwarf, position, 2.0f, WHITE);   // Draw 3d model with texture
            
            DrawLight(spotLight);   // Draw spot light
            DrawLight(dirLight);    // Draw directional light
            DrawLight(pointLight);  // Draw point light

            DrawGrid(10, 1.0f);     // Draw a grid

        End3dMode();
        
        DrawText("(c) Dwarf 3D model by David Moreno", screenWidth - 200, screenHeight - 20, 10, GRAY);
        
        DrawFPS(10, 10);

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