mirror of
https://github.com/raylib-cs/raylib-cs
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302 lines
14 KiB
C#
302 lines
14 KiB
C#
/*******************************************************************************************
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*
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* raylib [shaders] example - Basic PBR
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*
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* Example originally created with raylib 5.0, last time updated with raylib 5.1-dev
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*
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* Example contributed by Afan OLOVCIC (@_DevDad) and reviewed by Ramon Santamaria (@raysan5)
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2023-2024 Afan OLOVCIC (@_DevDad)
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*
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* Model: "Old Rusty Car" (https://skfb.ly/LxRy) by Renafox,
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* licensed under Creative Commons Attribution-NonCommercial
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* (http://creativecommons.org/licenses/by-nc/4.0/)
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*
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********************************************************************************************/
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using System.Numerics;
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using Examples.Shared;
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using static Raylib_cs.Raylib;
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namespace Examples.Shaders;
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public class BasicPbr
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{
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private const int GLSL_VERSION = 330;
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public static unsafe int Main()
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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// Enable Multi Sampling Anti Aliasing 4x (if available)
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SetConfigFlags(ConfigFlags.Msaa4xHint);
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InitWindow(screenWidth, screenHeight, "raylib [shaders] example - basic pbr");
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// Define the camera to look into our 3d world
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Camera3D camera = new();
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camera.Position = new Vector3(2.0f, 4.0f, 6.0f);
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camera.Target = new Vector3(0.0f, 0.5f, 0.0f);
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camera.Up = new Vector3(0.0f, 1.0f, 0.0f);
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camera.FovY = 45.0f;
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camera.Projection = CameraProjection.Perspective;
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// Load PBR shader and setup all required locations
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var shader = LoadShader("resources/shaders/glsl330/pbr.vs", "resources/shaders/glsl330/pbr.fs");
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shader.Locs[(int)ShaderLocationIndex.MapAlbedo] = GetShaderLocation(shader, "albedoMap");
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// WARNING: Metalness, roughness, and ambient occlusion are all packed into a MRA texture
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// They are passed as to the SHADER_LOC_MAP_METALNESS location for convenience,
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// shader already takes care of it accordingly
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shader.Locs[(int)ShaderLocationIndex.MapMetalness] = GetShaderLocation(shader, "mraMap");
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shader.Locs[(int)ShaderLocationIndex.MapNormal] = GetShaderLocation(shader, "normalMap");
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// WARNING: Similar to the MRA map, the emissive map packs different information
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// into a single texture: it stores height and emission data
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// It is binded to SHADER_LOC_MAP_EMISSION location an properly processed on shader
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shader.Locs[(int)ShaderLocationIndex.MapEmission] = GetShaderLocation(shader, "emissiveMap");
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shader.Locs[(int)ShaderLocationIndex.ColorDiffuse] = GetShaderLocation(shader, "albedoColor");
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// Setup additional required shader locations, including lights data
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shader.Locs[(int)ShaderLocationIndex.VectorView] = GetShaderLocation(shader, "viewPos");
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var lightCountLoc = GetShaderLocation(shader, "numOfLights");
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var maxLightCount = 4;
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SetShaderValue(shader, lightCountLoc, &maxLightCount, ShaderUniformDataType.Int);
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// Setup ambient color and intensity parameters
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var ambientIntensity = 0.02f;
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var ambientColor = new Color(26, 32, 135, 255);
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var ambientColorNormalized = new Vector3(ambientColor.R / 255.0F, ambientColor.G / 255.0F, ambientColor.B / 255.0F);
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SetShaderValue(shader, GetShaderLocation(shader, "ambientColor"), &ambientColorNormalized, ShaderUniformDataType.Vec3);
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SetShaderValue(shader, GetShaderLocation(shader, "ambient"), &ambientIntensity, ShaderUniformDataType.Float);
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// Get location for shader parameters that can be modified in real time
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var emissiveIntensityLoc = GetShaderLocation(shader, "emissivePower");
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var emissiveColorLoc = GetShaderLocation(shader, "emissiveColor");
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var textureTilingLoc = GetShaderLocation(shader, "tiling");
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// Load old car model using PBR maps and shader
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// WARNING: We know this model consists of a single model.meshes[0] and
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// that model.materials[0] is by default assigned to that mesh
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// There could be more complex models consisting of multiple meshes and
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// multiple materials defined for those meshes... but always 1 mesh = 1 material
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var car = LoadModel("resources/models/gltf/old_car_new.glb");
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// Assign already setup PBR shader to model.materials[0], used by models.meshes[0]
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car.Materials[0].Shader = shader;
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// Setup materials[0].maps default parameters
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car.Materials[0].Maps[(int)MaterialMapIndex.Albedo].Color = Color.White;
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car.Materials[0].Maps[(int)MaterialMapIndex.Metalness].Value = 0.0f;
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car.Materials[0].Maps[(int)MaterialMapIndex.Roughness].Value = 0.0f;
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car.Materials[0].Maps[(int)MaterialMapIndex.Occlusion].Value = 1.0f;
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car.Materials[0].Maps[(int)MaterialMapIndex.Emission].Color = new Color(255, 162, 0, 255);
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// Setup materials[0].maps default textures
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car.Materials[0].Maps[(int)MaterialMapIndex.Albedo].Texture = LoadTexture("resources/old_car_d.png");
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car.Materials[0].Maps[(int)MaterialMapIndex.Metalness].Texture = LoadTexture("resources/old_car_mra.png");
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car.Materials[0].Maps[(int)MaterialMapIndex.Normal].Texture = LoadTexture("resources/old_car_n.png");
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car.Materials[0].Maps[(int)MaterialMapIndex.Emission].Texture = LoadTexture("resources/old_car_e.png");
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// Load floor model mesh and assign material parameters
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// NOTE: A basic plane shape can be generated instead of being loaded from a model file
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var floor = LoadModel("resources/models/gltf/plane.glb");
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//Mesh floorMesh = GenMeshPlane(10, 10, 10, 10);
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//GenMeshTangents(&floorMesh); // TODO: Review tangents generation
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//Model floor = LoadModelFromMesh(floorMesh);
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// Assign material shader for our floor model, same PBR shader
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floor.Materials[0].Shader = shader;
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floor.Materials[0].Maps[(int)MaterialMapIndex.Albedo].Color = Color.White;
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floor.Materials[0].Maps[(int)MaterialMapIndex.Metalness].Value = 0.0f;
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floor.Materials[0].Maps[(int)MaterialMapIndex.Roughness].Value = 0.0f;
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floor.Materials[0].Maps[(int)MaterialMapIndex.Occlusion].Value = 1.0f;
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floor.Materials[0].Maps[(int)MaterialMapIndex.Emission].Color = Color.Black;
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floor.Materials[0].Maps[(int)MaterialMapIndex.Albedo].Texture = LoadTexture("resources/road_a.png");
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floor.Materials[0].Maps[(int)MaterialMapIndex.Metalness].Texture = LoadTexture("resources/road_mra.png");
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floor.Materials[0].Maps[(int)MaterialMapIndex.Normal].Texture = LoadTexture("resources/road_n.png");
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// Models texture tiling parameter can be stored in the Material struct if required (CURRENTLY NOT USED)
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// NOTE: Material.params[4] are available for generic parameters storage (float)
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var carTextureTiling = new Vector2(0.5f, 0.5f);
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var floorTextureTiling = new Vector2(0.5f, 0.5f);
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// Create some lights
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var lights = new PbrLight[4];
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lights[0] = PbrLights.CreateLight(
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0,
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PbrLightType.Point,
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new Vector3(-1.0f, 1.0f, -2.0f),
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new Vector3(0.0f, 0.0f, 0.0f),
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Color.Yellow,
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4.0f,
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shader);
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lights[1] = PbrLights.CreateLight(1,
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PbrLightType.Point,
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new Vector3(2.0f, 1.0f, 1.0f),
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new Vector3(0.0f, 0.0f, 0.0f),
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Color.Green,
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3.3f,
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shader);
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lights[2] = PbrLights.CreateLight(
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2, PbrLightType.Point,
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new Vector3(-2.0f, 1.0f, 1.0f),
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new Vector3(0.0f, 0.0f, 0.0f),
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Color.Red,
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8.3f,
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shader);
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lights[3] = PbrLights.CreateLight(
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3,
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PbrLightType.Point,
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new Vector3(1.0f, 1.0f, -2.0f),
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new Vector3(0.0f, 0.0f, 0.0f),
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Color.Black,
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2.0f,
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shader);
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// Setup material texture maps usage in shader
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// NOTE: By default, the texture maps are always used
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var usage = 1;
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SetShaderValue(shader, GetShaderLocation(shader, "useTexAlbedo"), &usage, ShaderUniformDataType.Int);
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SetShaderValue(shader, GetShaderLocation(shader, "useTexNormal"), &usage, ShaderUniformDataType.Int);
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SetShaderValue(shader, GetShaderLocation(shader, "useTexMRA"), &usage, ShaderUniformDataType.Int);
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SetShaderValue(shader, GetShaderLocation(shader, "useTexEmissive"), &usage, ShaderUniformDataType.Int);
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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//---------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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UpdateCamera(&camera, CameraMode.Orbital);
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// Update the shader with the camera view vector (points towards { 0.0f, 0.0f, 0.0f })
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var cameraPos = camera.Position;
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SetShaderValue(shader, shader.Locs[(int)ShaderLocationIndex.VectorView], cameraPos, ShaderUniformDataType.Vec3);
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// Check key inputs to enable/disable lights
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if (IsKeyPressed(KeyboardKey.One))
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{
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lights[2].Enabled = !lights[2].Enabled;
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}
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if (IsKeyPressed(KeyboardKey.Two))
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{
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lights[1].Enabled = !lights[1].Enabled;
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}
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if (IsKeyPressed(KeyboardKey.Three))
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{
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lights[3].Enabled = !lights[3].Enabled;
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}
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if (IsKeyPressed(KeyboardKey.Four))
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{
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lights[0].Enabled = !lights[0].Enabled;
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}
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// Update light values on shader (actually, only enable/disable them)
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for (var i = 0; i < 4; i++)
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{
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UpdateLight(shader, lights[i]);
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}
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(Color.Black);
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BeginMode3D(camera);
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// Set floor model texture tiling and emissive color parameters on shader
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SetShaderValue(shader, textureTilingLoc, &floorTextureTiling, ShaderUniformDataType.Vec2);
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var floorEmissiveColor = ColorNormalize(floor.Materials[0].Maps[(int)MaterialMapIndex.Emission].Color);
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SetShaderValue(shader, emissiveColorLoc, &floorEmissiveColor, ShaderUniformDataType.Vec4);
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DrawModel(floor, Vector3.Zero, 5.0f, Color.White); // Draw floor model
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// Set old car model texture tiling, emissive color and emissive intensity parameters on shader
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SetShaderValue(shader, textureTilingLoc, &carTextureTiling, ShaderUniformDataType.Vec2);
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var carEmissiveColor = ColorNormalize(car.Materials[0].Maps[(int)MaterialMapIndex.Emission].Color);
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SetShaderValue(shader, emissiveColorLoc, &carEmissiveColor, ShaderUniformDataType.Vec4);
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var emissiveIntensity = 0.01f;
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SetShaderValue(shader, emissiveIntensityLoc, &emissiveIntensity, ShaderUniformDataType.Float);
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DrawModel(car, Vector3.Zero, 0.005f, Color.White); // Draw car model
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// Draw spheres to show the lights positions
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for (var i = 0; i < 4; i++)
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{
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var color = lights[i].Color;
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var lightColor = new Color((byte)(color.X * 255), (byte)(color.Y * 255), (byte)(color.Z * 255),
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(byte)(color.W * 255));
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if (lights[i].Enabled)
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{
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DrawSphereEx(lights[i].Position, 0.2f, 8, 8, lightColor);
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}
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else
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{
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DrawSphereWires(lights[i].Position, 0.2f, 8, 8, ColorAlpha(lightColor, 0.3f));
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}
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}
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EndMode3D();
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DrawText("Toggle lights: [1][2][3][4]", 10, 40, 20, Color.LightGray);
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DrawText("(c) Old Rusty Car model by Renafox (https://skfb.ly/LxRy)", screenWidth - 320, screenHeight - 20, 10, Color.LightGray);
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DrawFPS(10, 10);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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// Unbind (disconnect) shader from car.material[0]
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// to avoid UnloadMaterial() trying to unload it automatically
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car.Materials[0].Shader = new();
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UnloadMaterial(car.Materials[0]);
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car.Materials[0].Maps = null;
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UnloadModel(car);
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floor.Materials[0].Shader = new();
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UnloadMaterial(floor.Materials[0]);
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floor.Materials[0].Maps = null;
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UnloadModel(floor);
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UnloadShader(shader);
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CloseWindow();
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//--------------------------------------------------------------------------------------
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return 0;
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}
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private static void UpdateLight(Shader shader, PbrLight light)
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{
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SetShaderValue(shader, light.EnabledLoc, light.Enabled, ShaderUniformDataType.Int);
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SetShaderValue(shader, light.TypeLoc, light.Type, ShaderUniformDataType.Int);
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// Send to shader light position values
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SetShaderValue(shader, light.PositionLoc, light.Position, ShaderUniformDataType.Vec3);
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// Send to shader light target position values
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SetShaderValue(shader, light.TargetLoc, light.Target, ShaderUniformDataType.Vec3);
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SetShaderValue(shader, light.ColorLoc, light.Color, ShaderUniformDataType.Vec4);
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SetShaderValue(shader, light.IntensityLoc, light.Intensity, ShaderUniformDataType.Float);
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}
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}
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