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/*******************************************************************************************
*
* raylib [core] example - Doing skinning on the gpu using a vertex shader
*
* Example originally created with raylib 4.5, last time updated with raylib 4.5
*
* Example contributed by Daniel Holden (@orangeduck) and reviewed by 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) 2024 Daniel Holden (@orangeduck)
*
* Note: Due to limitations in the Apple OpenGL driver, this feature does not work on MacOS
*
********************************************************************************************/
#include "raylib.h"
#include "raymath.h"
#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#else // PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#endif
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [models] example - GPU skinning");
// Define the camera to look into our 3d world
Camera camera = { 0 };
camera.position = (Vector3){ 5.0f, 5.0f, 5.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 2.0f, 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
// Load gltf model
Model characterModel = LoadModel("resources/models/gltf/greenman.glb"); // Load character model
// Load skinning shader
Shader skinningShader = LoadShader(TextFormat("resources/shaders/glsl%i/skinning.vs", GLSL_VERSION),
TextFormat("resources/shaders/glsl%i/skinning.fs", GLSL_VERSION));
characterModel.materials[1].shader = skinningShader;
// Load gltf model animations
int animsCount = 0;
unsigned int animIndex = 0;
unsigned int animCurrentFrame = 0;
ModelAnimation *modelAnimations = LoadModelAnimations("resources/models/gltf/greenman.glb", &animsCount);
Vector3 position = { 0.0f, 0.0f, 0.0f }; // Set model position
DisableCursor(); // Limit cursor to relative movement inside the window
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_THIRD_PERSON);
// Select current animation
if (IsKeyPressed(KEY_T)) animIndex = (animIndex + 1)%animsCount;
else if (IsKeyPressed(KEY_G)) animIndex = (animIndex + animsCount - 1)%animsCount;
// Update model animation
ModelAnimation anim = modelAnimations[animIndex];
animCurrentFrame = (animCurrentFrame + 1)%anim.frameCount;
characterModel.transform = MatrixTranslate(position.x, position.y, position.z);
UpdateModelAnimationBones(characterModel, anim, animCurrentFrame);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
BeginMode3D(camera);
// Draw character mesh, pose calculation is done in shader (GPU skinning)
DrawMesh(characterModel.meshes[0], characterModel.materials[1], characterModel.transform);
DrawGrid(10, 1.0f);
EndMode3D();
DrawText("Use the T/G to switch animation", 10, 10, 20, GRAY);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
UnloadModelAnimations(modelAnimations, animsCount); // Unload model animation
UnloadModel(characterModel); // Unload model and meshes/material
UnloadShader(skinningShader); // Unload GPU skinning shader
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
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