143 lines
4.3 KiB
Go
143 lines
4.3 KiB
Go
/*******************************************************************************************
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*
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* raylib [shaders] example - Vertex displacement
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*
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* Example complexity rating: [★★★☆] 3/4
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*
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* Example originally created with raylib 5.0, last time updated with raylib 5.5
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*
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* Example originally contributed by Alex ZH (@ZzzhHe) 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) 2023-2025 Alex ZH (@ZzzhHe)
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*
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********************************************************************************************/
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package main
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import (
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"fmt"
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"os"
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"path/filepath"
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rl "github.com/gen2brain/raylib-go/raylib"
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)
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// NOTE: Usage: `PLATFORM_DESKTOP=1 go run .`
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var glslVersion int
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func init() {
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if v, ok := os.LookupEnv("PLATFORM_DESKTOP"); ok && v == "1" {
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glslVersion = 330
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} else { // PLATFORM_ANDROID, PLATFORM_WEB
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glslVersion = 100
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}
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}
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// ------------------------------------------------------------------------------------
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// Program main entry point
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// ------------------------------------------------------------------------------------
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func main() {
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// Initialization
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//--------------------------------------------------------------------------------------
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const screenWidth int32 = 800
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const screenHeight int32 = 450
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rl.SetConfigFlags(rl.FlagMsaa4xHint) // Enable Multi Sampling Anti Aliasing 4x (if available)
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rl.InitWindow(screenWidth, screenHeight, "raylib [shaders] example - vertex displacement")
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defer rl.CloseWindow() // Close window and OpenGL context
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// Set up camera
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camera := rl.Camera{
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Position: rl.NewVector3(20.0, 5.0, -20.0),
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Target: rl.Vector3Zero(),
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Up: rl.NewVector3(0.0, 1.0, 0.0),
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Fovy: 60.0,
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Projection: rl.CameraPerspective,
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}
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// Load vertex and fragment shaders
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shaderDir := fmt.Sprintf("glsl%d", glslVersion)
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shader := rl.LoadShader(
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filepath.Join(shaderDir, "vertex_displacement.vs"),
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filepath.Join(shaderDir, "vertex_displacement.fs"),
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)
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defer rl.UnloadShader(shader)
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timeLoc := rl.GetShaderLocation(shader, "time")
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// Load perlin noise texture
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perlinNoiseImage := rl.GenImagePerlinNoise(512, 512, 0, 0, 1.0)
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perlinNoiseMap := rl.LoadTextureFromImage(perlinNoiseImage)
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defer rl.UnloadTexture(perlinNoiseMap)
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rl.UnloadImage(perlinNoiseImage)
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// Set shader uniform location
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perlinNoiseMapLoc := rl.GetShaderLocation(shader, "perlinNoiseMap")
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rl.EnableShader(shader.ID)
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rl.ActiveTextureSlot(1)
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rl.EnableTexture(perlinNoiseMap.ID)
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rl.SetUniformSampler(perlinNoiseMapLoc, 1)
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// Create a plane mesh and model
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planeMesh := rl.GenMeshPlane(50, 50, 50, 50)
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planeModel := rl.LoadModelFromMesh(planeMesh)
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defer rl.UnloadModel(planeModel)
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// Set plane model material
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planeModel.Materials.Shader = shader
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timer := float32(0)
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rl.DisableCursor()
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rl.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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for !rl.WindowShouldClose() { // Detect window close button or ESC key
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// Update
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//----------------------------------------------------------------------------------
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rl.UpdateCamera(&camera, rl.CameraFree) // Update camera with free camera mode
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deltaTime := rl.GetFrameTime()
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timer += deltaTime
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timeValue := []float32{timer}
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rl.SetShaderValue(shader, timeLoc, timeValue, rl.ShaderUniformFloat) // Send time value to shader
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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rl.BeginDrawing()
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rl.ClearBackground(rl.RayWhite)
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rl.BeginMode3D(camera)
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rl.BeginShaderMode(shader)
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// Draw plane model
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rl.DrawModel(planeModel, rl.Vector3Zero(), 1.0, rl.White)
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rl.EndShaderMode()
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rl.EndMode3D()
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rl.DrawText("Vertex displacement", 10, 10, 20, rl.DarkGray)
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rl.DrawFPS(10, 40)
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rl.EndDrawing()
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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// NOTE: Unload all loaded resources at this point (that are not `defer`-ed)
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//--------------------------------------------------------------------------------------
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}
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