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JohnLudlow merged 2 commits into from
Jul 30, 2025
Merged

Add basic PBR shader example #3

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918ab21
Add basic PBR shader example
Jul 29, 2025
7699d99
Merge branch 'main' of https://github.com/JohnLudlow/RaylibCsExamples…
Jul 30, 2025
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81 changes: 81 additions & 0 deletions Community/Shaders/RaylibCsExamples.Community.Shaders.BasicPbr/PbrLight.cs
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using System;
using System.ComponentModel.DataAnnotations;
using System.Numerics;
using Raylib_cs;

namespace RaylibCsExamples.Community.Shaders.BasicPbr;

public struct PbrLight
{
public required PbrLightType Type { get; set; }
public required bool Enabled { get; set; }
public required Vector3 Position { get; set; }
public required Vector3 Target { get; set; }
public required Vector4 Color { get; set; }
public required float Intensity { get; set; }

// Shader light parameters locations
public required int TypeLoc { get; set; }
public required int EnabledLoc { get; set; }
public required int PositionLoc { get; set; }
public required int TargetLoc { get; set; }
public required int ColorLoc { get; set; }
public required int IntensityLoc { get; set; }
}

public enum PbrLightType
{
Directional,
Point,
Spot,
}

public class PbrLights
{
public static PbrLight CreatePbrLight(
int lightsCount,
PbrLightType type,
Vector3 pos,
Vector3 target,
Color color,
float intensity,
Shader shader
)
{
var light = new PbrLight
{
Enabled = true,
Type = type,
Position = pos,
Target = target,
Color = new Vector4(
color.R / 255.0f,
color.G / 255.0f,
color.B / 255.0f,
color.A / 255.0f
),
Intensity = intensity,

EnabledLoc = Raylib.GetShaderLocation(shader, $"lights[{lightsCount}].enabled"),
TypeLoc = Raylib.GetShaderLocation(shader, $"lights[{lightsCount}].type"),
PositionLoc = Raylib.GetShaderLocation(shader, $"lights[{lightsCount}].position"),
TargetLoc = Raylib.GetShaderLocation(shader, $"lights[{lightsCount}].target"),
ColorLoc = Raylib.GetShaderLocation(shader, $"lights[{lightsCount}].color"),
IntensityLoc = Raylib.GetShaderLocation(shader, $"lights[{lightsCount}].intensity")
};

UpdateShaderValues(shader, light);

return light;
}

public static void UpdateShaderValues(Shader shader, PbrLight light)
{
Raylib.SetShaderValue(shader, light.EnabledLoc , light.Enabled ? 1 : 0 , ShaderUniformDataType.Int);
Raylib.SetShaderValue(shader, light.TypeLoc , light.Type , ShaderUniformDataType.Int);
Raylib.SetShaderValue(shader, light.TargetLoc , light.Target , ShaderUniformDataType.Vec3);
Raylib.SetShaderValue(shader, light.PositionLoc , light.Position , ShaderUniformDataType.Vec3);
Raylib.SetShaderValue(shader, light.ColorLoc , light.Color , ShaderUniformDataType.Vec4);
Raylib.SetShaderValue(shader, light.IntensityLoc, light.Intensity , ShaderUniformDataType.Float);
}
}
267 changes: 267 additions & 0 deletions Community/Shaders/RaylibCsExamples.Community.Shaders.BasicPbr/Program.cs
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using System.Numerics;
using Raylib_cs;

namespace RaylibCsExamples.Community.Shaders.BasicPbr;

public class Program
{
private const int GLSL_VERSION = 330;

public static unsafe int Main()
{
const int screenWidth = 1600;
const int screenHeight = 900;

Raylib.SetConfigFlags(ConfigFlags.Msaa4xHint);
Raylib.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - basic pbr");

var camera = new Camera3D
{
Position = new Vector3(2.0f, 4.0f, 6.0f),
Target = new Vector3(0.0f, 0.5f, 0.0f),
Up = new Vector3(0.0f, 1.0f, 0.0f),
FovY = 45.0f,
Projection = CameraProjection.Perspective
};

var shader = Raylib.LoadShader(
"Resources/pbr.vs",
"Resources/pbr.fs"
);

shader.Locs[(int)ShaderLocationIndex.MapAlbedo] = Raylib.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[(int)ShaderLocationIndex.MapMetalness] = Raylib.GetShaderLocation(shader, "mraMap");
shader.Locs[(int)ShaderLocationIndex.MapNormal] = Raylib.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[(int)ShaderLocationIndex.MapEmission] = Raylib.GetShaderLocation(shader, "emissiveMap");
shader.Locs[(int)ShaderLocationIndex.ColorDiffuse] = Raylib.GetShaderLocation(shader, "albedoColor");

shader.Locs[(int)ShaderLocationIndex.VectorView] = Raylib.GetShaderLocation(shader, "viewPos");

var lightCountLoc = Raylib.GetShaderLocation(shader, "numOfLights");
var maxLightCount = 4;

Raylib.SetShaderValue(shader, lightCountLoc, &maxLightCount, ShaderUniformDataType.Int);

var ambientIntensity = .02f;
var ambientColor = new Color(26, 32, 135, 255);
var ambientColorNormalized = new Vector3(
ambientColor.R / 255.0f,
ambientColor.G / 255.0f,
ambientColor.B / 255.0f
);

Raylib.SetShaderValue(shader, Raylib.GetShaderLocation(shader, "ambientColor"), &ambientColorNormalized, ShaderUniformDataType.Vec3);
Raylib.SetShaderValue(shader, Raylib.GetShaderLocation(shader, "ambient"), &ambientIntensity, ShaderUniformDataType.Float);

var car = LoadCarModel(shader);
var floor = LoadFloorModel(shader);

var lights = new[] {
PbrLights.CreatePbrLight(
lightsCount : 0,
type : PbrLightType.Point,
pos : new Vector3(-1, 1, -2),
target : Vector3.Zero,
color : Color.Yellow,
intensity : 4,
shader : shader
),

PbrLights.CreatePbrLight(
lightsCount : 1,
type : PbrLightType.Point,
pos : new Vector3(-2, 1, 1),
target : Vector3.Zero,
color : Color.Green,
intensity : 3.3f,
shader : shader
),

PbrLights.CreatePbrLight(
lightsCount : 2,
type : PbrLightType.Point,
pos : new Vector3(-2, 1, 1),
target : Vector3.Zero,
color : Color.Red,
intensity : 8.3f,
shader : shader
),

PbrLights.CreatePbrLight(
lightsCount : 3,
type : PbrLightType.Point,
pos : new Vector3(1, 1, -2),
target : Vector3.Zero,
color : Color.Black,
intensity : 2,
shader : shader
)
};

// Setup material texture maps usage in shader
// NOTE: By default, the texture maps are always used
var usage = 1;
Raylib.SetShaderValue(shader, Raylib.GetShaderLocation(shader, "useTexAlbedo") , &usage, ShaderUniformDataType.Int);
Raylib.SetShaderValue(shader, Raylib.GetShaderLocation(shader, "useTexNormal") , &usage, ShaderUniformDataType.Int);
Raylib.SetShaderValue(shader, Raylib.GetShaderLocation(shader, "useTexMRA") , &usage, ShaderUniformDataType.Int);
Raylib.SetShaderValue(shader, Raylib.GetShaderLocation(shader, "useTexEmissive") , &usage, ShaderUniformDataType.Int);
Raylib.SetTargetFPS(60);

var emissiveIntensityLoc = Raylib.GetShaderLocation(shader, "emissivePower");
var emissiveColorLoc = Raylib.GetShaderLocation(shader, "emissiveColor");
var textureTilingLoc = Raylib.GetShaderLocation(shader, "tiling");

while (!Raylib.WindowShouldClose())
{
Raylib.UpdateCamera(&camera, CameraMode.Orbital);
Raylib.SetShaderValue(shader, shader.Locs[(int)ShaderLocationIndex.VectorView], camera.Position, ShaderUniformDataType.Vec3);

if (Raylib.IsKeyPressed(KeyboardKey.One))
{
lights[2].Enabled = !lights[2].Enabled;
}

if (Raylib.IsKeyPressed(KeyboardKey.Two))
{
lights[1].Enabled = !lights[1].Enabled;
}

if (Raylib.IsKeyPressed(KeyboardKey.Three))
{
lights[3].Enabled = !lights[3].Enabled;
}

if (Raylib.IsKeyPressed(KeyboardKey.Four))
{
lights[0].Enabled = !lights[0].Enabled;
}

foreach (var light in lights)
{
UpdateLight(shader, light);
}

Raylib.BeginDrawing();
{
Raylib.ClearBackground(Color.Black);
Raylib.BeginMode3D(camera);
{


var carTextureTiling = new Vector2(.5f, .5f);
var floorTextureTiling = new Vector2(.5f, .5f);

Raylib.SetShaderValue(shader, textureTilingLoc, &floorTextureTiling, ShaderUniformDataType.Vec2);
var floorEmissiveColor = Raylib.ColorNormalize(floor.Materials[0].Maps[(int)MaterialMapIndex.Emission].Color);
Raylib.SetShaderValue(shader, emissiveColorLoc, &floorEmissiveColor, ShaderUniformDataType.Vec4);

Raylib.DrawModel(floor, Vector3.Zero, 5, Color.White);

Raylib.SetShaderValue(shader, textureTilingLoc, &carTextureTiling, ShaderUniformDataType.Vec2);
var carEmissiveColor = Raylib.ColorNormalize(car.Materials[0].Maps[(int)MaterialMapIndex.Emission].Color);
Raylib.SetShaderValue(shader, emissiveColorLoc, &carEmissiveColor, ShaderUniformDataType.Vec4);

var emissiveIntensity = .01f;
Raylib.SetShaderValue(shader, emissiveColorLoc, &emissiveIntensity, ShaderUniformDataType.Float);

Raylib.DrawModel(car, Vector3.Zero, .005f, Color.White);

foreach (var light in lights)
{
var color = light.Color;
var lightColor = new Color(
(byte)(color.X * 255),
(byte)(color.Y * 255),
(byte)(color.Z * 255),
(byte)(color.W * 255)
);

if (light.Enabled)
{
Raylib.DrawSphereEx(light.Position, .2f, 8, 8, lightColor);
}
else
{
Raylib.DrawSphereWires(light.Position, .2f, 8, 8, Raylib.ColorAlpha(lightColor, .3f));
}
}
}
Raylib.EndMode3D();

Raylib.DrawText("ToggleLights: [1][2][3][4]", 10, 40, 20, Color.LightGray);
Raylib.DrawText("(c) Old Rusty Car model by Renafox (https://skfb.ly/LxRy)", screenWidth - 320, screenHeight - 20, 10, Color.LightGray);
Raylib.DrawFPS(10, 10);
}
Raylib.EndDrawing();
}

car.Materials[0].Shader = new();
Raylib.UnloadMaterial(car.Materials[0]);
car.Materials[0].Maps = null;
Raylib.UnloadModel(car);

floor.Materials[0].Shader = new();
Raylib.UnloadMaterial(floor.Materials[0]);
floor.Materials[0].Maps = null;
Raylib.UnloadModel(floor);

Raylib.UnloadShader(shader);

Raylib.CloseWindow();

return 0;
}

private static void UpdateLight(Shader shader, PbrLight light)
{
Raylib.SetShaderValue(shader, light.EnabledLoc, light.Enabled, ShaderUniformDataType.Int);
Raylib.SetShaderValue(shader, light.TypeLoc, light.Type, ShaderUniformDataType.Int);
Raylib.SetShaderValue(shader, light.PositionLoc, light.Position, ShaderUniformDataType.Vec3);
Raylib.SetShaderValue(shader, light.ColorLoc, light.Color, ShaderUniformDataType.Vec4);
Raylib.SetShaderValue(shader, light.IntensityLoc, light.Intensity, ShaderUniformDataType.Float);
}

private static unsafe Model LoadFloorModel(Shader shader)
{
var floor = Raylib.LoadModel("Resources/plane.glb");

floor.Materials[0].Shader = shader;
floor.Materials[0].Maps[(int)MaterialMapIndex.Albedo].Color = Color.White;
floor.Materials[0].Maps[(int)MaterialMapIndex.Metalness].Value = 0;
floor.Materials[0].Maps[(int)MaterialMapIndex.Roughness].Value = 0;
floor.Materials[0].Maps[(int)MaterialMapIndex.Occlusion].Value = 1;
floor.Materials[0].Maps[(int)MaterialMapIndex.Emission].Color = Color.Black;

floor.Materials[0].Maps[(int)MaterialMapIndex.Albedo].Texture = Raylib.LoadTexture("Resources/road_a.png");
floor.Materials[0].Maps[(int)MaterialMapIndex.Metalness].Texture = Raylib.LoadTexture("Resources/road_mra.png");
floor.Materials[0].Maps[(int)MaterialMapIndex.Normal].Texture = Raylib.LoadTexture("Resources/road_n.png");

return floor;
}

private static unsafe Model LoadCarModel(Shader shader)
{
var car = Raylib.LoadModel("Resources/old_car_new.glb");

car.Materials[0].Shader = shader;

car.Materials[0].Maps[(int)MaterialMapIndex.Albedo].Color = Color.White;
car.Materials[0].Maps[(int)MaterialMapIndex.Metalness].Value = 0;
car.Materials[0].Maps[(int)MaterialMapIndex.Roughness].Value = 0;
car.Materials[0].Maps[(int)MaterialMapIndex.Occlusion].Value = 1;
car.Materials[0].Maps[(int)MaterialMapIndex.Emission].Color = new(255, 162, 0, 255);

car.Materials[0].Maps[(int)MaterialMapIndex.Albedo].Texture = Raylib.LoadTexture("Resources/old_car_d.png");
car.Materials[0].Maps[(int)MaterialMapIndex.Metalness].Texture = Raylib.LoadTexture("Resources/old_car_mra.png");
car.Materials[0].Maps[(int)MaterialMapIndex.Normal].Texture = Raylib.LoadTexture("Resources/old_car_n.png");
car.Materials[0].Maps[(int)MaterialMapIndex.Emission].Texture = Raylib.LoadTexture("Resources/old_car_e.png");

return car;
}
}
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