Merge pull request #470 from Hultan/draw_cube_texture
New example: models/draw_cube_textured
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Milan Nikolic
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c4ef7b53e9
2 changed files with 256 additions and 0 deletions
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examples/models/draw_cube_texture/cubicmap_atlas.png
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examples/models/draw_cube_texture/cubicmap_atlas.png
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examples/models/draw_cube_texture/main.go
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examples/models/draw_cube_texture/main.go
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/*******************************************************************************************
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*
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* raylib [models] example - Draw textured cube
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*
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* Example originally created with raylib 4.5, last time updated with raylib 4.5
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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) 2022-2024 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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package main
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import rl "github.com/gen2brain/raylib-go/raylib"
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const (
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screenWidth = 800
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screenHeight = 450
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)
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func main() {
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rl.InitWindow(screenWidth, screenHeight, "raylib [models] example - draw cube texture")
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// Define the camera to look into our 3d world
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camera := rl.Camera{
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Position: rl.Vector3{
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Y: 10.0,
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Z: 10.0,
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},
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Target: rl.Vector3{},
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Up: rl.Vector3{Y: 1.0},
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Fovy: 45.0,
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Projection: rl.CameraPerspective,
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}
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// Load texture to be applied to the cubes sides
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texture := rl.LoadTexture("cubicmap_atlas.png")
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rl.SetTargetFPS(60) // Set our game to run at 60 frames-per-second
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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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// TODO: Update your variables here
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// Draw
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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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// Draw cube with an applied texture
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vec := rl.Vector3{
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X: -2.0,
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Y: 2.0,
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}
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DrawCubeTexture(texture, vec, 2.0, 4.0, 2.0, rl.White)
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// Draw cube with an applied texture, but only a defined rectangle piece of the texture
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rec := rl.Rectangle{
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Y: float32(texture.Height) / 2.0,
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Width: float32(texture.Width) / 2.0,
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Height: float32(texture.Height) / 2.0,
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}
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vec = rl.Vector3{
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X: 2.0,
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Y: 1.0,
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}
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DrawCubeTextureRec(texture, rec, vec, 2.0, 2.0, 2.0, rl.White)
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rl.DrawGrid(10, 1.0) // Draw a grid
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rl.EndMode3D()
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rl.DrawFPS(10, 10)
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rl.EndDrawing()
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}
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// De-Initialization
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rl.UnloadTexture(texture) // Unload texture
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rl.CloseWindow() // Close window and OpenGL context
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}
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// DrawCubeTexture draws a textured cube
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// NOTE: Cube position is the center position
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func DrawCubeTexture(texture rl.Texture2D, position rl.Vector3, width, height, length float32, color rl.Color) {
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x := position.X
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y := position.Y
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z := position.Z
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// Set desired texture to be enabled while drawing following vertex data
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rl.SetTexture(texture.ID)
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// Vertex data transformation can be defined with the commented lines,
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// but in this example we calculate the transformed vertex data directly when calling rlVertex3f()
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// rl.PushMatrix()
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// NOTE: Transformation is applied in inverse order (scale -> rotate -> translate)
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//rl.Translatef(2.0, 0.0, 0.0)
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//rl.Rotatef(45, 0, 1, )
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//rl.Scalef(2.0, 2.0, 2.0)
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rl.Begin(rl.Quads)
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rl.Color4ub(color.R, color.G, color.B, color.A)
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// Front Face
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rl.Normal3f(0.0, 0.0, 1.0) // Normal Pointing Towards Viewer
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rl.TexCoord2f(0.0, 0.0)
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rl.Vertex3f(x-width/2, y-height/2, z+length/2) // Bottom Left Of The Texture and Quad
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rl.TexCoord2f(1.0, 0.0)
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rl.Vertex3f(x+width/2, y-height/2, z+length/2) // Bottom Right Of The Texture and Quad
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rl.TexCoord2f(1.0, 1.0)
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rl.Vertex3f(x+width/2, y+height/2, z+length/2) // Top Right Of The Texture and Quad
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rl.TexCoord2f(0.0, 1.0)
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rl.Vertex3f(x-width/2, y+height/2, z+length/2) // Top Left Of The Texture and Quad
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// Back Face
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rl.Normal3f(0.0, 0.0, -1.0) // Normal Pointing Away From Viewer
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rl.TexCoord2f(1.0, 0.0)
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rl.Vertex3f(x-width/2, y-height/2, z-length/2) // Bottom Right Of The Texture and Quad
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rl.TexCoord2f(1.0, 1.0)
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rl.Vertex3f(x-width/2, y+height/2, z-length/2) // Top Right Of The Texture and Quad
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rl.TexCoord2f(0.0, 1.0)
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rl.Vertex3f(x+width/2, y+height/2, z-length/2) // Top Left Of The Texture and Quad
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rl.TexCoord2f(0.0, 0.0)
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rl.Vertex3f(x+width/2, y-height/2, z-length/2) // Bottom Left Of The Texture and Quad
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// Top Face
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rl.Normal3f(0.0, 1.0, 0.0) // Normal Pointing Up
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rl.TexCoord2f(0.0, 1.0)
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rl.Vertex3f(x-width/2, y+height/2, z-length/2) // Top Left Of The Texture and Quad.
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rl.TexCoord2f(0.0, 0.0)
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rl.Vertex3f(x-width/2, y+height/2, z+length/2) // Bottom Left Of The Texture and Quad
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rl.TexCoord2f(1.0, 0.0)
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rl.Vertex3f(x+width/2, y+height/2, z+length/2) // Bottom Right Of The Texture and Quad
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rl.TexCoord2f(1.0, 1.0)
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rl.Vertex3f(x+width/2, y+height/2, z-length/2) // Top Right Of The Texture and Quad Bottom Face
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rl.Normal3f(0.0, -1.0, 0.0) // Normal Pointing Down
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rl.TexCoord2f(1.0, 1.0)
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rl.Vertex3f(x-width/2, y-height/2, z-length/2) // Top Right Of The Texture and Quad
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rl.TexCoord2f(0.0, 1.0)
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rl.Vertex3f(x+width/2, y-height/2, z-length/2) // Top Left Of The Texture and Quad
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rl.TexCoord2f(0.0, 0.0)
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rl.Vertex3f(x+width/2, y-height/2, z+length/2) // Bottom Left Of The Texture and Quad
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rl.TexCoord2f(1.0, 0.0)
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rl.Vertex3f(x-width/2, y-height/2, z+length/2) // Bottom Right Of The Texture and Quad
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// Right face
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rl.Normal3f(1.0, 0.0, 0.0) // Normal Pointing Right
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rl.TexCoord2f(1.0, 0.0)
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rl.Vertex3f(x+width/2, y-height/2, z-length/2) // Bottom Right Of The Texture and Quad
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rl.TexCoord2f(1.0, 1.0)
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rl.Vertex3f(x+width/2, y+height/2, z-length/2) // Top Right Of The Texture and Quad
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rl.TexCoord2f(0.0, 1.0)
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rl.Vertex3f(x+width/2, y+height/2, z+length/2) // Top Left Of The Texture and Quad
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rl.TexCoord2f(0.0, 0.0)
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rl.Vertex3f(x+width/2, y-height/2, z+length/2) // Bottom Left Of The Texture and Quad
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// Left Face
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rl.Normal3f(-1.0, 0.0, 0.0) // Normal Pointing Left
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rl.TexCoord2f(0.0, 0.0)
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rl.Vertex3f(x-width/2, y-height/2, z-length/2) // Bottom Left Of The Texture and Quad
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rl.TexCoord2f(1.0, 0.0)
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rl.Vertex3f(x-width/2, y-height/2, z+length/2) // Bottom Right Of The Texture and Quad
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rl.TexCoord2f(1.0, 1.0)
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rl.Vertex3f(x-width/2, y+height/2, z+length/2) // Top Right Of The Texture and Quad
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rl.TexCoord2f(0.0, 1.0)
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rl.Vertex3f(x-width/2, y+height/2, z-length/2) // Top Left Of The Texture and Quad
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rl.End()
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//rl.PopMatrix()
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rl.SetTexture(0)
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}
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// DrawCubeTextureRec draws a cube with texture piece applied to all faces
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func DrawCubeTextureRec(texture rl.Texture2D, source rl.Rectangle, position rl.Vector3, width, height,
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length float32, color rl.Color) {
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x := position.X
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y := position.Y
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z := position.Z
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texWidth := float32(texture.Width)
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texHeight := float32(texture.Height)
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// Set desired texture to be enabled while drawing following vertex data
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rl.SetTexture(texture.ID)
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// We calculate the normalized texture coordinates for the desired texture-source-rectangle
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// It means converting from (tex.width, tex.height) coordinates to [0.0f, 1.0f] equivalent
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rl.Begin(rl.Quads)
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rl.Color4ub(color.R, color.G, color.B, color.A)
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// Front face
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rl.Normal3f(0.0, 0.0, 1.0)
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rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x-width/2, y-height/2, z+length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x+width/2, y-height/2, z+length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
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rl.Vertex3f(x+width/2, y+height/2, z+length/2)
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rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
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rl.Vertex3f(x-width/2, y+height/2, z+length/2)
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// Back face
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rl.Normal3f(0.0, 0.0, -1.0)
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rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x-width/2, y-height/2, z-length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
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rl.Vertex3f(x-width/2, y+height/2, z-length/2)
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rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
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rl.Vertex3f(x+width/2, y+height/2, z-length/2)
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rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x+width/2, y-height/2, z-length/2)
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// Top face
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rl.Normal3f(0.0, 1.0, 0.0)
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rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
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rl.Vertex3f(x-width/2, y+height/2, z-length/2)
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rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x-width/2, y+height/2, z+length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x+width/2, y+height/2, z+length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
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rl.Vertex3f(x+width/2, y+height/2, z-length/2)
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// Bottom face
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rl.Normal3f(0.0, -1.0, 0.0)
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rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
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rl.Vertex3f(x-width/2, y-height/2, z-length/2)
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rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
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rl.Vertex3f(x+width/2, y-height/2, z-length/2)
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rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x+width/2, y-height/2, z+length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x-width/2, y-height/2, z+length/2)
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// Right face
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rl.Normal3f(1.0, 0.0, 0.0)
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rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x+width/2, y-height/2, z-length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
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rl.Vertex3f(x+width/2, y+height/2, z-length/2)
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rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
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rl.Vertex3f(x+width/2, y+height/2, z+length/2)
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rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x+width/2, y-height/2, z+length/2)
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// Left face
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rl.Normal3f(-1.0, 0.0, 0.0)
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rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x-width/2, y-height/2, z-length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
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rl.Vertex3f(x-width/2, y-height/2, z+length/2)
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rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
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rl.Vertex3f(x-width/2, y+height/2, z+length/2)
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rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
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rl.Vertex3f(x-width/2, y+height/2, z-length/2)
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rl.End()
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rl.SetTexture(0)
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}
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