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https://github.com/raylib-cs/raylib-cs
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Update/merge examples back into main repo (#192)
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326
Examples/Shaders/MeshInstancing.cs
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326
Examples/Shaders/MeshInstancing.cs
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/*******************************************************************************************
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*
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* raylib [shaders] example - rlgl module usage for instanced meshes
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*
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* This example uses [rlgl] module funtionality (pseudo-OpenGL 1.1 style coding)
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*
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* This example has been created using raylib 3.5 (www.raylib.com)
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* raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
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*
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* Example contributed by @seanpringle and reviewed by Ramon Santamaria (@raysan5)
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*
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* Copyright (c) 2020 @seanpringle
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*
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********************************************************************************************/
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using System;
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using System.Numerics;
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using static Raylib_cs.Raylib;
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namespace Examples.Shaders;
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public class MeshInstancing
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{
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public static 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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const int fps = 60;
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// Enable Multi Sampling Anti Aliasing 4x (if available)
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SetConfigFlags(ConfigFlags.FLAG_MSAA_4X_HINT);
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InitWindow(screenWidth, screenHeight, "raylib [shaders] example - rlgl mesh instanced");
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// Speed of jump animation
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int speed = 30;
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// Count of separate groups jumping around
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int groups = 2;
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// Maximum amplitude of jump
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float amp = 10;
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// Global variance in jump height
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float variance = 0.8f;
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// Individual cube's computed loop timer
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float loop = 0.0f;
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// Used for various 3D coordinate & vector ops
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float x = 0.0f;
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float y = 0.0f;
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float z = 0.0f;
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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(-125.0f, 125.0f, -125.0f);
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camera.Target = new Vector3(0.0f, 0.0f, 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.CAMERA_PERSPECTIVE;
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// Number of instances to display
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const int instances = 10000;
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Mesh cube = GenMeshCube(1.0f, 1.0f, 1.0f);
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// Rotation state of instances
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Matrix4x4[] rotations = new Matrix4x4[instances];
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// Per-frame rotation animation of instances
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Matrix4x4[] rotationsInc = new Matrix4x4[instances];
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// Locations of instances
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Matrix4x4[] translations = new Matrix4x4[instances];
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// Scatter random cubes around
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for (int i = 0; i < instances; i++)
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{
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x = GetRandomValue(-50, 50);
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y = GetRandomValue(-50, 50);
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z = GetRandomValue(-50, 50);
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translations[i] = Matrix4x4.CreateTranslation(x, y, z);
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x = GetRandomValue(0, 360);
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y = GetRandomValue(0, 360);
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z = GetRandomValue(0, 360);
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Vector3 axis = Vector3.Normalize(new Vector3(x, y, z));
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float angle = (float)GetRandomValue(0, 10) * DEG2RAD;
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rotationsInc[i] = Matrix4x4.CreateFromAxisAngle(axis, angle);
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rotations[i] = Matrix4x4.Identity;
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}
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// Pre-multiplied transformations passed to rlgl
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Matrix4x4[] transforms = new Matrix4x4[instances];
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Shader shader = LoadShader(
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"resources/shaders/glsl330/lighting_instancing.vs",
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"resources/shaders/glsl330/lighting.fs"
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);
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// Get some shader loactions
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unsafe
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{
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int* locs = (int*)shader.Locs;
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locs[(int)ShaderLocationIndex.SHADER_LOC_MATRIX_MVP] = GetShaderLocation(shader, "mvp");
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locs[(int)ShaderLocationIndex.SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
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locs[(int)ShaderLocationIndex.SHADER_LOC_MATRIX_MODEL] = GetShaderLocationAttrib(
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shader,
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"instanceTransform"
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);
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}
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// Ambient light level
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int ambientLoc = GetShaderLocation(shader, "ambient");
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Raylib.SetShaderValue(
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shader,
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ambientLoc,
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new float[] { 0.2f, 0.2f, 0.2f, 1.0f },
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ShaderUniformDataType.SHADER_UNIFORM_VEC4
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);
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Rlights.CreateLight(
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0,
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LightType.Directorional,
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new Vector3(50, 50, 0),
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Vector3.Zero,
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Color.WHITE,
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shader
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);
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Material material = LoadMaterialDefault();
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material.Shader = shader;
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unsafe
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{
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material.Maps[(int)MaterialMapIndex.MATERIAL_MAP_DIFFUSE].Color = Color.RED;
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}
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int textPositionY = 300;
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// Simple frames counter to manage animation
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int framesCounter = 0;
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SetTargetFPS(fps);
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose())
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{
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// Update
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//----------------------------------------------------------------------------------
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UpdateCamera(ref camera, CameraMode.CAMERA_FREE);
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textPositionY = 300;
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framesCounter += 1;
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if (IsKeyDown(KeyboardKey.KEY_UP))
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{
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amp += 0.5f;
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}
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if (IsKeyDown(KeyboardKey.KEY_DOWN))
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{
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amp = (amp <= 1) ? 1.0f : (amp - 1.0f);
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}
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if (IsKeyDown(KeyboardKey.KEY_LEFT))
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{
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variance = (variance <= 0.0f) ? 0.0f : (variance - 0.01f);
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}
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if (IsKeyDown(KeyboardKey.KEY_RIGHT))
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{
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variance = (variance >= 1.0f) ? 1.0f : (variance + 0.01f);
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}
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if (IsKeyDown(KeyboardKey.KEY_ONE))
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{
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groups = 1;
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}
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if (IsKeyDown(KeyboardKey.KEY_TWO))
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{
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groups = 2;
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}
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if (IsKeyDown(KeyboardKey.KEY_THREE))
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{
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groups = 3;
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}
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if (IsKeyDown(KeyboardKey.KEY_FOUR))
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{
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groups = 4;
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}
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if (IsKeyDown(KeyboardKey.KEY_FIVE))
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{
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groups = 5;
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}
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if (IsKeyDown(KeyboardKey.KEY_SIX))
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{
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groups = 6;
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}
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if (IsKeyDown(KeyboardKey.KEY_SEVEN))
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{
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groups = 7;
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}
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if (IsKeyDown(KeyboardKey.KEY_EIGHT))
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{
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groups = 8;
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}
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if (IsKeyDown(KeyboardKey.KEY_NINE))
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{
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groups = 9;
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}
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if (IsKeyDown(KeyboardKey.KEY_W))
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{
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groups = 7;
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amp = 25;
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speed = 18;
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variance = 0.70f;
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}
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if (IsKeyDown(KeyboardKey.KEY_EQUAL))
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{
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speed = (speed <= (int)(fps * 0.25f)) ? (int)(fps * 0.25f) : (int)(speed * 0.95f);
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}
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if (IsKeyDown(KeyboardKey.KEY_KP_ADD))
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{
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speed = (speed <= (int)(fps * 0.25f)) ? (int)(fps * 0.25f) : (int)(speed * 0.95f);
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}
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if (IsKeyDown(KeyboardKey.KEY_MINUS))
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{
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speed = (int)MathF.Max(speed * 1.02f, speed + 1);
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}
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if (IsKeyDown(KeyboardKey.KEY_KP_SUBTRACT))
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{
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speed = (int)MathF.Max(speed * 1.02f, speed + 1);
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}
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// Update the light shader with the camera view position
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float[] cameraPos = { camera.Position.X, camera.Position.Y, camera.Position.Z };
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Raylib.SetShaderValue(
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shader,
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(int)ShaderLocationIndex.SHADER_LOC_VECTOR_VIEW,
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cameraPos,
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ShaderUniformDataType.SHADER_UNIFORM_VEC3
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);
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// Apply per-instance transformations
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for (int i = 0; i < instances; i++)
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{
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rotations[i] = Matrix4x4.Multiply(rotations[i], rotationsInc[i]);
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transforms[i] = Matrix4x4.Multiply(rotations[i], translations[i]);
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// Get the animation cycle's framesCounter for this instance
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loop = (float)((framesCounter + (int)(((float)(i % groups) / groups) * speed)) % speed) / speed;
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// Calculate the y according to loop cycle
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y = (MathF.Sin(loop * MathF.PI * 2)) * amp * ((1 - variance) + (variance * (float)(i % (groups * 10)) / (groups * 10)));
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// Clamp to floor
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y = (y < 0) ? 0.0f : y;
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transforms[i] = Matrix4x4.Multiply(transforms[i], Matrix4x4.CreateTranslation(0.0f, y, 0.0f));
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transforms[i] = Matrix4x4.Transpose(transforms[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.RAYWHITE);
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BeginMode3D(camera);
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DrawMeshInstanced(cube, material, transforms, instances);
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EndMode3D();
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DrawText("A CUBE OF DANCING CUBES!", 490, 10, 20, Color.MAROON);
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DrawText("PRESS KEYS:", 10, textPositionY, 20, Color.BLACK);
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DrawText("1 - 9", 10, textPositionY += 25, 10, Color.BLACK);
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DrawText(": Number of groups", 50, textPositionY, 10, Color.BLACK);
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DrawText($": {groups}", 160, textPositionY, 10, Color.BLACK);
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DrawText("UP", 10, textPositionY += 15, 10, Color.BLACK);
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DrawText(": increase amplitude", 50, textPositionY, 10, Color.BLACK);
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DrawText($": {amp}%.2f", 160, textPositionY, 10, Color.BLACK);
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DrawText("DOWN", 10, textPositionY += 15, 10, Color.BLACK);
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DrawText(": decrease amplitude", 50, textPositionY, 10, Color.BLACK);
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DrawText("LEFT", 10, textPositionY += 15, 10, Color.BLACK);
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DrawText(": decrease variance", 50, textPositionY, 10, Color.BLACK);
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DrawText($": {variance}.2f", 160, textPositionY, 10, Color.BLACK);
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DrawText("RIGHT", 10, textPositionY += 15, 10, Color.BLACK);
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DrawText(": increase variance", 50, textPositionY, 10, Color.BLACK);
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DrawText("+/=", 10, textPositionY += 15, 10, Color.BLACK);
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DrawText(": increase speed", 50, textPositionY, 10, Color.BLACK);
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DrawText($": {speed} = {((float)fps / speed)} loops/sec", 160, textPositionY, 10, Color.BLACK);
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DrawText("-", 10, textPositionY += 15, 10, Color.BLACK);
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DrawText(": decrease speed", 50, textPositionY, 10, Color.BLACK);
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DrawText("W", 10, textPositionY += 15, 10, Color.BLACK);
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DrawText(": Wild setup!", 50, textPositionY, 10, Color.BLACK);
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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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CloseWindow();
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//--------------------------------------------------------------------------------------
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return 0;
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}
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}
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