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raylib-src
espelhamento de https://github.com/raysan5/raylib


								/*******************************************************************************************

								*

								*   raylib [shaders] example - Mesh instancing

								*

								*   Example originally created with raylib 3.7, last time updated with raylib 4.2

								*

								*   Example contributed by @seanpringle and reviewed by Max (@moliad) and Ramon Santamaria (@raysan5)

								*

								*   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) 2020-2023 @seanpringle, Max (@moliad) and Ramon Santamaria (@raysan5)

								*

								********************************************************************************************/


								#include "raylib.h"

								#include "raymath.h"


								#define RLIGHTS_IMPLEMENTATION

								#include "rlights.h"


								#include <stdlib.h>         // Required for: calloc(), free()


								#if defined(PLATFORM_DESKTOP)

								    #define GLSL_VERSION            330

								#else   // PLATFORM_ANDROID, PLATFORM_WEB

								    #define GLSL_VERSION            100

								#endif


								#define MAX_INSTANCES  10000


								//------------------------------------------------------------------------------------

								// Program main entry point

								//------------------------------------------------------------------------------------

								int main(void)

								{

								    // Initialization

								    //--------------------------------------------------------------------------------------

								    const int screenWidth = 800;

								    const int screenHeight = 450;


								    InitWindow(screenWidth, screenHeight, "raylib [shaders] example - mesh instancing");


								    // Define the camera to look into our 3d world

								    Camera camera = { 0 };

								    camera.position = (Vector3){ -125.0f, 125.0f, -125.0f };    // Camera position

								    camera.target = (Vector3){ 0.0f, 0.0f, 0.0f };              // Camera looking at point

								    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };                  // Camera up vector (rotation towards target)

								    camera.fovy = 45.0f;                                        // Camera field-of-view Y

								    camera.projection = CAMERA_PERSPECTIVE;                     // Camera projection type


								    // Define mesh to be instanced

								    Mesh cube = GenMeshCube(1.0f, 1.0f, 1.0f);


								    // Define transforms to be uploaded to GPU for instances

								    Matrix *transforms = (Matrix *)RL_CALLOC(MAX_INSTANCES, sizeof(Matrix));   // Pre-multiplied transformations passed to rlgl


								    // Translate and rotate cubes randomly

								    for (int i = 0; i < MAX_INSTANCES; i++)

								    {

								        Matrix translation = MatrixTranslate((float)GetRandomValue(-50, 50), (float)GetRandomValue(-50, 50), (float)GetRandomValue(-50, 50));

								        Vector3 axis = Vector3Normalize((Vector3){ (float)GetRandomValue(0, 360), (float)GetRandomValue(0, 360), (float)GetRandomValue(0, 360) });

								        float angle = (float)GetRandomValue(0, 10)*DEG2RAD;

								        Matrix rotation = MatrixRotate(axis, angle);


								        transforms[i] = MatrixMultiply(rotation, translation);

								    }


								    // Load lighting shader

								    Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/lighting_instancing.vs", GLSL_VERSION),

								                               TextFormat("resources/shaders/glsl%i/lighting.fs", GLSL_VERSION));

								    // Get shader locations

								    shader.locs[SHADER_LOC_MATRIX_MVP] = GetShaderLocation(shader, "mvp");

								    shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");

								    shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocationAttrib(shader, "instanceTransform");


								    // Set shader value: ambient light level

								    int ambientLoc = GetShaderLocation(shader, "ambient");

								    SetShaderValue(shader, ambientLoc, (float[4]){ 0.2f, 0.2f, 0.2f, 1.0f }, SHADER_UNIFORM_VEC4);


								    // Create one light

								    CreateLight(LIGHT_DIRECTIONAL, (Vector3){ 50.0f, 50.0f, 0.0f }, Vector3Zero(), WHITE, shader);


								    // NOTE: We are assigning the intancing shader to material.shader

								    // to be used on mesh drawing with DrawMeshInstanced()

								    Material matInstances = LoadMaterialDefault();

								    matInstances.shader = shader;

								    matInstances.maps[MATERIAL_MAP_DIFFUSE].color = RED;


								    // Load default material (using raylib intenral default shader) for non-instanced mesh drawing

								    // WARNING: Default shader enables vertex color attribute BUT GenMeshCube() does not generate vertex colors, so,

								    // when drawing the color attribute is disabled and a default color value is provided as input for thevertex attribute

								    Material matDefault = LoadMaterialDefault();

								    matDefault.maps[MATERIAL_MAP_DIFFUSE].color = BLUE;


								    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

								        //----------------------------------------------------------------------------------

								        UpdateCamera(&camera, CAMERA_ORBITAL);


								        // Update the light shader with the camera view position

								        float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };

								        SetShaderValue(shader, shader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);

								        //----------------------------------------------------------------------------------


								        // Draw

								        //----------------------------------------------------------------------------------

								        BeginDrawing();


								            ClearBackground(RAYWHITE);


								            BeginMode3D(camera);


								                // Draw cube mesh with default material (BLUE)

								                DrawMesh(cube, matDefault, MatrixTranslate(-10.0f, 0.0f, 0.0f));


								                // Draw meshes instanced using material containing instancing shader (RED + lighting),

								                // transforms[] for the instances should be provided, they are dynamically

								                // updated in GPU every frame, so we can animate the different mesh instances

								                DrawMeshInstanced(cube, matInstances, transforms, MAX_INSTANCES);


								                // Draw cube mesh with default material (BLUE)

								                DrawMesh(cube, matDefault, MatrixTranslate(10.0f, 0.0f, 0.0f));


								            EndMode3D();


								            DrawFPS(10, 10);


								        EndDrawing();

								        //----------------------------------------------------------------------------------

								    }


								    // De-Initialization

								    //--------------------------------------------------------------------------------------

								    RL_FREE(transforms);    // Free transforms


								    CloseWindow();          // Close window and OpenGL context

								    //--------------------------------------------------------------------------------------


								    return 0;

								}