/*******************************************************************************************
*
* raylib [shaders] example - Basic PBR
*
* Example complexity rating: [★★★★] 4/4
*
* Example originally created with raylib 5.0, last time updated with raylib 5.1-dev
*
* Example contributed by Afan OLOVCIC (@_DevDad) 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) 2023-2025 Afan OLOVCIC (@_DevDad)
*
* Model: "Old Rusty Car" (https://skfb.ly/LxRy) by Renafox,
* licensed under Creative Commons Attribution-NonCommercial
* (http://creativecommons.org/licenses/by-nc/4.0/)
*
********************************************************************************************/
#include "raylib.h"
#if defined(PLATFORM_DESKTOP)
#define GLSL_VERSION 330
#else // PLATFORM_ANDROID, PLATFORM_WEB
#define GLSL_VERSION 100
#endif
#include <stdlib.h> // Required for: NULL
#define MAX_LIGHTS 4 // Max dynamic lights supported by shader
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
// Light type
typedef enum {
LIGHT_DIRECTIONAL = 0,
LIGHT_POINT,
LIGHT_SPOT
} LightType;
// Light data
typedef struct {
int type;
int enabled;
Vector3 position;
Vector3 target;
float color[4];
float intensity;
// Shader light parameters locations
int typeLoc;
int enabledLoc;
int positionLoc;
int targetLoc;
int colorLoc;
int intensityLoc;
} Light;
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
static int lightCount = 0; // Current number of dynamic lights that have been created
//----------------------------------------------------------------------------------
// Module specific Functions Declaration
//----------------------------------------------------------------------------------
// Create a light and get shader locations
static Light CreateLight(int type, Vector3 position, Vector3 target, Color color, float intensity, Shader shader);
// Update light properties on shader
// NOTE: Light shader locations should be available
static void UpdateLight(Shader shader, Light light);
//----------------------------------------------------------------------------------
// Main Entry Point
//----------------------------------------------------------------------------------
int main()
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
SetConfigFlags(FLAG_MSAA_4X_HINT);
InitWindow(screenWidth, screenHeight, "raylib [shaders] example - basic pbr");
// Define the camera to look into our 3d world
Camera camera = { 0 };
camera.position = (Vector3){ 2.0f, 2.0f, 6.0f }; // Camera position
camera.target = (Vector3){ 0.0f, 0.5f, 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 PBR shader and setup all required locations
Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/pbr.vs", GLSL_VERSION),
TextFormat("resources/shaders/glsl%i/pbr.fs", GLSL_VERSION));
shader.locs[SHADER_LOC_MAP_ALBEDO] = GetShaderLocation(shader, "albedoMap");
// WARNING: Metalness, roughness, and ambient occlusion are all packed into a MRA texture
// They are passed as to the SHADER_LOC_MAP_METALNESS location for convenience,
// shader already takes care of it accordingly
shader.locs[SHADER_LOC_MAP_METALNESS] = GetShaderLocation(shader, "mraMap");
shader.locs[SHADER_LOC_MAP_NORMAL] = GetShaderLocation(shader, "normalMap");
// WARNING: Similar to the MRA map, the emissive map packs different information
// into a single texture: it stores height and emission data
// It is binded to SHADER_LOC_MAP_EMISSION location an properly processed on shader
shader.locs[SHADER_LOC_MAP_EMISSION] = GetShaderLocation(shader, "emissiveMap");
shader.locs[SHADER_LOC_COLOR_DIFFUSE] = GetShaderLocation(shader, "albedoColor");
// Setup additional required shader locations, including lights data
shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
int lightCountLoc = GetShaderLocation(shader, "numOfLights");
int maxLightCount = MAX_LIGHTS;
SetShaderValue(shader, lightCountLoc, &maxLightCount, SHADER_UNIFORM_INT);
// Setup ambient color and intensity parameters
float ambientIntensity = 0.02f;
Color ambientColor = (Color){ 26, 32, 135, 255 };
Vector3 ambientColorNormalized = (Vector3){ ambientColor.r/255.0f, ambientColor.g/255.0f, ambientColor.b/255.0f };
SetShaderValue(shader, GetShaderLocation(shader, "ambientColor"), &ambientColorNormalized, SHADER_UNIFORM_VEC3);
SetShaderValue(shader, GetShaderLocation(shader, "ambient"), &ambientIntensity, SHADER_UNIFORM_FLOAT);
// Get location for shader parameters that can be modified in real time
int emissiveIntensityLoc = GetShaderLocation(shader, "emissivePower");
int emissiveColorLoc = GetShaderLocation(shader, "emissiveColor");
int textureTilingLoc = GetShaderLocation(shader, "tiling");
// Load old car model using PBR maps and shader
// WARNING: We know this model consists of a single model.meshes[0] and
// that model.materials[0] is by default assigned to that mesh
// There could be more complex models consisting of multiple meshes and
// multiple materials defined for those meshes... but always 1 mesh = 1 material
Model car = LoadModel("resources/models/old_car_new.glb");
// Assign already setup PBR shader to model.materials[0], used by models.meshes[0]
car.materials[0].shader = shader;
// Setup materials[0].maps default parameters
car.materials[0].maps[MATERIAL_MAP_ALBEDO].color = WHITE;
car.materials[0].maps[MATERIAL_MAP_METALNESS].value = 0.0f;
car.materials[0].maps[MATERIAL_MAP_ROUGHNESS].value = 0.0f;
car.materials[0].maps[MATERIAL_MAP_OCCLUSION].value = 1.0f;
car.materials[0].maps[MATERIAL_MAP_EMISSION].color = (Color){ 255, 162, 0, 255 };
// Setup materials[0].maps default textures
car.materials[0].maps[MATERIAL_MAP_ALBEDO].texture = LoadTexture("resources/old_car_d.png");
car.materials[0].maps[MATERIAL_MAP_METALNESS].texture = LoadTexture("resources/old_car_mra.png");
car.materials[0].maps[MATERIAL_MAP_NORMAL].texture = LoadTexture("resources/old_car_n.png");
car.materials[0].maps[MATERIAL_MAP_EMISSION].texture = LoadTexture("resources/old_car_e.png");
// Load floor model mesh and assign material parameters
// NOTE: A basic plane shape can be generated instead of being loaded from a model file
Model floor = LoadModel("resources/models/plane.glb");
//Mesh floorMesh = GenMeshPlane(10, 10, 10, 10);
//GenMeshTangents(&floorMesh); // TODO: Review tangents generation
//Model floor = LoadModelFromMesh(floorMesh);
// Assign material shader for our floor model, same PBR shader
floor.materials[0].shader = shader;
floor.materials[0].maps[MATERIAL_MAP_ALBEDO].color = WHITE;
floor.materials[0].maps[MATERIAL_MAP_METALNESS].value = 0.0f;
floor.materials[0].maps[MATERIAL_MAP_ROUGHNESS].value = 0.0f;
floor.materials[0].maps[MATERIAL_MAP_OCCLUSION].value = 1.0f;
floor.materials[0].maps[MATERIAL_MAP_EMISSION].color = BLACK;
floor.materials[0].maps[MATERIAL_MAP_ALBEDO].texture = LoadTexture("resources/road_a.png");
floor.materials[0].maps[MATERIAL_MAP_METALNESS].texture = LoadTexture("resources/road_mra.png");
floor.materials[0].maps[MATERIAL_MAP_NORMAL].texture = LoadTexture("resources/road_n.png");
// Models texture tiling parameter can be stored in the Material struct if required (CURRENTLY NOT USED)
// NOTE: Material.params[4] are available for generic parameters storage (float)
Vector2 carTextureTiling = (Vector2){ 0.5f, 0.5f };
Vector2 floorTextureTiling = (Vector2){ 0.5f, 0.5f };
// Create some lights
Light lights[MAX_LIGHTS] = { 0 };
lights[0] = CreateLight(LIGHT_POINT, (Vector3){ -1.0f, 1.0f, -2.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, YELLOW, 4.0f, shader);
lights[1] = CreateLight(LIGHT_POINT, (Vector3){ 2.0f, 1.0f, 1.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, GREEN, 3.3f, shader);
lights[2] = CreateLight(LIGHT_POINT, (Vector3){ -2.0f, 1.0f, 1.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, RED, 8.3f, shader);
lights[3] = CreateLight(LIGHT_POINT, (Vector3){ 1.0f, 1.0f, -2.0f }, (Vector3){ 0.0f, 0.0f, 0.0f }, BLUE, 2.0f, shader);
// Setup material texture maps usage in shader
// NOTE: By default, the texture maps are always used
int usage = 1;
SetShaderValue(shader, GetShaderLocation(shader, "useTexAlbedo"), &usage, SHADER_UNIFORM_INT);
SetShaderValue(shader, GetShaderLocation(shader, "useTexNormal"), &usage, SHADER_UNIFORM_INT);
SetShaderValue(shader, GetShaderLocation(shader, "useTexMRA"), &usage, SHADER_UNIFORM_INT);
SetShaderValue(shader, GetShaderLocation(shader, "useTexEmissive"), &usage, SHADER_UNIFORM_INT);
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 shader with the camera view vector (points towards { 0.0f, 0.0f, 0.0f })
float cameraPos[3] = {camera.position.x, camera.position.y, camera.position.z};
SetShaderValue(shader, shader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);
// Check key inputs to enable/disable lights
if (IsKeyPressed(KEY_ONE)) { lights[2].enabled = !lights[2].enabled; }
if (IsKeyPressed(KEY_TWO)) { lights[1].enabled = !lights[1].enabled; }
if (IsKeyPressed(KEY_THREE)) { lights[3].enabled = !lights[3].enabled; }
if (IsKeyPressed(KEY_FOUR)) { lights[0].enabled = !lights[0].enabled; }
// Update light values on shader (actually, only enable/disable them)
for (int i = 0; i < MAX_LIGHTS; i++) UpdateLight(shader, lights[i]);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(BLACK);
BeginMode3D(camera);
// Set floor model texture tiling and emissive color parameters on shader
SetShaderValue(shader, textureTilingLoc, &floorTextureTiling, SHADER_UNIFORM_VEC2);
Vector4 floorEmissiveColor = ColorNormalize(floor.materials[0].maps[MATERIAL_MAP_EMISSION].color);
SetShaderValue(shader, emissiveColorLoc, &floorEmissiveColor, SHADER_UNIFORM_VEC4);
DrawModel(floor, (Vector3){ 0.0f, 0.0f, 0.0f }, 5.0f, WHITE); // Draw floor model
// Set old car model texture tiling, emissive color and emissive intensity parameters on shader
SetShaderValue(shader, textureTilingLoc, &carTextureTiling, SHADER_UNIFORM_VEC2);
Vector4 carEmissiveColor = ColorNormalize(car.materials[0].maps[MATERIAL_MAP_EMISSION].color);
SetShaderValue(shader, emissiveColorLoc, &carEmissiveColor, SHADER_UNIFORM_VEC4);
float emissiveIntensity = 0.01f;
SetShaderValue(shader, emissiveIntensityLoc, &emissiveIntensity, SHADER_UNIFORM_FLOAT);
DrawModel(car, (Vector3){ 0.0f, 0.0f, 0.0f }, 0.25f, WHITE); // Draw car model
// Draw spheres to show the lights positions
for (int i = 0; i < MAX_LIGHTS; i++)
{
Color lightColor = (Color){ lights[i].color[0]*255, lights[i].color[1]*255, lights[i].color[2]*255, lights[i].color[3]*255 };
if (lights[i].enabled) DrawSphereEx(lights[i].position, 0.2f, 8, 8, lightColor);
else DrawSphereWires(lights[i].position, 0.2f, 8, 8, ColorAlpha(lightColor, 0.3f));
}
EndMode3D();
DrawText("Toggle lights: [1][2][3][4]", 10, 40, 20, LIGHTGRAY);
DrawText("(c) Old Rusty Car model by Renafox (https://skfb.ly/LxRy)", screenWidth - 320, screenHeight - 20, 10, LIGHTGRAY);
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
// Unbind (disconnect) shader from car.material[0]
// to avoid UnloadMaterial() trying to unload it automatically
car.materials[0].shader = (Shader){ 0 };
UnloadMaterial(car.materials[0]);
car.materials[0].maps = NULL;
UnloadModel(car);
floor.materials[0].shader = (Shader){ 0 };
UnloadMaterial(floor.materials[0]);
floor.materials[0].maps = NULL;
UnloadModel(floor);
UnloadShader(shader); // Unload Shader
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
// Create light with provided data
// NOTE: It updated the global lightCount and it's limited to MAX_LIGHTS
static Light CreateLight(int type, Vector3 position, Vector3 target, Color color, float intensity, Shader shader)
{
Light light = { 0 };
if (lightCount < MAX_LIGHTS)
{
light.enabled = 1;
light.type = type;
light.position = position;
light.target = target;
light.color[0] = (float)color.r/255.0f;
light.color[1] = (float)color.g/255.0f;
light.color[2] = (float)color.b/255.0f;
light.color[3] = (float)color.a/255.0f;
light.intensity = intensity;
// NOTE: Shader parameters names for lights must match the requested ones
light.enabledLoc = GetShaderLocation(shader, TextFormat("lights[%i].enabled", lightCount));
light.typeLoc = GetShaderLocation(shader, TextFormat("lights[%i].type", lightCount));
light.positionLoc = GetShaderLocation(shader, TextFormat("lights[%i].position", lightCount));
light.targetLoc = GetShaderLocation(shader, TextFormat("lights[%i].target", lightCount));
light.colorLoc = GetShaderLocation(shader, TextFormat("lights[%i].color", lightCount));
light.intensityLoc = GetShaderLocation(shader, TextFormat("lights[%i].intensity", lightCount));
UpdateLight(shader, light);
lightCount++;
}
return light;
}
// Send light properties to shader
// NOTE: Light shader locations should be available
static void UpdateLight(Shader shader, Light light)
{
SetShaderValue(shader, light.enabledLoc, &light.enabled, SHADER_UNIFORM_INT);
SetShaderValue(shader, light.typeLoc, &light.type, SHADER_UNIFORM_INT);
// Send to shader light position values
float position[3] = { light.position.x, light.position.y, light.position.z };
SetShaderValue(shader, light.positionLoc, position, SHADER_UNIFORM_VEC3);
// Send to shader light target position values
float target[3] = { light.target.x, light.target.y, light.target.z };
SetShaderValue(shader, light.targetLoc, target, SHADER_UNIFORM_VEC3);
SetShaderValue(shader, light.colorLoc, light.color, SHADER_UNIFORM_VEC4);
SetShaderValue(shader, light.intensityLoc, &light.intensity, SHADER_UNIFORM_FLOAT);
}