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New example: models/draw_cube_textured #470

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Dec 3, 2024
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New example: models/draw_cube_textured #470

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Binary file added examples/models/draw_cube_texture/cubicmap_atlas.png
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256 changes: 256 additions & 0 deletions examples/models/draw_cube_texture/main.go
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/*******************************************************************************************
*
* raylib [models] example - Draw textured cube
*
* Example originally created with raylib 4.5, last time updated with raylib 4.5
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2022-2024 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
package main

import rl "github.com/gen2brain/raylib-go/raylib"

const (
screenWidth = 800
screenHeight = 450
)

func main() {
rl.InitWindow(screenWidth, screenHeight, "raylib [models] example - draw cube texture")

// Define the camera to look into our 3d world
camera := rl.Camera{
Position: rl.Vector3{
Y: 10.0,
Z: 10.0,
},
Target: rl.Vector3{},
Up: rl.Vector3{Y: 1.0},
Fovy: 45.0,
Projection: rl.CameraPerspective,
}

// Load texture to be applied to the cubes sides
texture := rl.LoadTexture("cubicmap_atlas.png")

rl.SetTargetFPS(60) // Set our game to run at 60 frames-per-second

// Main game loop
for !rl.WindowShouldClose() { // Detect window close button or ESC key
// Update
// TODO: Update your variables here

// Draw
rl.BeginDrawing()
rl.ClearBackground(rl.RayWhite)
rl.BeginMode3D(camera)

// Draw cube with an applied texture
vec := rl.Vector3{
X: -2.0,
Y: 2.0,
}
DrawCubeTexture(texture, vec, 2.0, 4.0, 2.0, rl.White)

// Draw cube with an applied texture, but only a defined rectangle piece of the texture
rec := rl.Rectangle{
Y: float32(texture.Height) / 2.0,
Width: float32(texture.Width) / 2.0,
Height: float32(texture.Height) / 2.0,
}
vec = rl.Vector3{
X: 2.0,
Y: 1.0,
}
DrawCubeTextureRec(texture, rec, vec, 2.0, 2.0, 2.0, rl.White)

rl.DrawGrid(10, 1.0) // Draw a grid
rl.EndMode3D()
rl.DrawFPS(10, 10)
rl.EndDrawing()
}

// De-Initialization
rl.UnloadTexture(texture) // Unload texture
rl.CloseWindow() // Close window and OpenGL context
}

// DrawCubeTexture draws a textured cube
// NOTE: Cube position is the center position
func DrawCubeTexture(texture rl.Texture2D, position rl.Vector3, width, height, length float32, color rl.Color) {
x := position.X
y := position.Y
z := position.Z

// Set desired texture to be enabled while drawing following vertex data
rl.SetTexture(texture.ID)

// Vertex data transformation can be defined with the commented lines,
// but in this example we calculate the transformed vertex data directly when calling rlVertex3f()
// rl.PushMatrix()
// NOTE: Transformation is applied in inverse order (scale -> rotate -> translate)
//rl.Translatef(2.0, 0.0, 0.0)
//rl.Rotatef(45, 0, 1, )
//rl.Scalef(2.0, 2.0, 2.0)

rl.Begin(rl.Quads)
rl.Color4ub(color.R, color.G, color.B, color.A)
// Front Face
rl.Normal3f(0.0, 0.0, 1.0) // Normal Pointing Towards Viewer
rl.TexCoord2f(0.0, 0.0)
rl.Vertex3f(x-width/2, y-height/2, z+length/2) // Bottom Left Of The Texture and Quad
rl.TexCoord2f(1.0, 0.0)
rl.Vertex3f(x+width/2, y-height/2, z+length/2) // Bottom Right Of The Texture and Quad
rl.TexCoord2f(1.0, 1.0)
rl.Vertex3f(x+width/2, y+height/2, z+length/2) // Top Right Of The Texture and Quad
rl.TexCoord2f(0.0, 1.0)
rl.Vertex3f(x-width/2, y+height/2, z+length/2) // Top Left Of The Texture and Quad
// Back Face
rl.Normal3f(0.0, 0.0, -1.0) // Normal Pointing Away From Viewer
rl.TexCoord2f(1.0, 0.0)
rl.Vertex3f(x-width/2, y-height/2, z-length/2) // Bottom Right Of The Texture and Quad
rl.TexCoord2f(1.0, 1.0)
rl.Vertex3f(x-width/2, y+height/2, z-length/2) // Top Right Of The Texture and Quad
rl.TexCoord2f(0.0, 1.0)
rl.Vertex3f(x+width/2, y+height/2, z-length/2) // Top Left Of The Texture and Quad
rl.TexCoord2f(0.0, 0.0)
rl.Vertex3f(x+width/2, y-height/2, z-length/2) // Bottom Left Of The Texture and Quad
// Top Face
rl.Normal3f(0.0, 1.0, 0.0) // Normal Pointing Up
rl.TexCoord2f(0.0, 1.0)
rl.Vertex3f(x-width/2, y+height/2, z-length/2) // Top Left Of The Texture and Quad.
rl.TexCoord2f(0.0, 0.0)
rl.Vertex3f(x-width/2, y+height/2, z+length/2) // Bottom Left Of The Texture and Quad
rl.TexCoord2f(1.0, 0.0)
rl.Vertex3f(x+width/2, y+height/2, z+length/2) // Bottom Right Of The Texture and Quad
rl.TexCoord2f(1.0, 1.0)
rl.Vertex3f(x+width/2, y+height/2, z-length/2) // Top Right Of The Texture and Quad Bottom Face
rl.Normal3f(0.0, -1.0, 0.0) // Normal Pointing Down
rl.TexCoord2f(1.0, 1.0)
rl.Vertex3f(x-width/2, y-height/2, z-length/2) // Top Right Of The Texture and Quad
rl.TexCoord2f(0.0, 1.0)
rl.Vertex3f(x+width/2, y-height/2, z-length/2) // Top Left Of The Texture and Quad
rl.TexCoord2f(0.0, 0.0)
rl.Vertex3f(x+width/2, y-height/2, z+length/2) // Bottom Left Of The Texture and Quad
rl.TexCoord2f(1.0, 0.0)
rl.Vertex3f(x-width/2, y-height/2, z+length/2) // Bottom Right Of The Texture and Quad
// Right face
rl.Normal3f(1.0, 0.0, 0.0) // Normal Pointing Right
rl.TexCoord2f(1.0, 0.0)
rl.Vertex3f(x+width/2, y-height/2, z-length/2) // Bottom Right Of The Texture and Quad
rl.TexCoord2f(1.0, 1.0)
rl.Vertex3f(x+width/2, y+height/2, z-length/2) // Top Right Of The Texture and Quad
rl.TexCoord2f(0.0, 1.0)
rl.Vertex3f(x+width/2, y+height/2, z+length/2) // Top Left Of The Texture and Quad
rl.TexCoord2f(0.0, 0.0)
rl.Vertex3f(x+width/2, y-height/2, z+length/2) // Bottom Left Of The Texture and Quad
// Left Face
rl.Normal3f(-1.0, 0.0, 0.0) // Normal Pointing Left
rl.TexCoord2f(0.0, 0.0)
rl.Vertex3f(x-width/2, y-height/2, z-length/2) // Bottom Left Of The Texture and Quad
rl.TexCoord2f(1.0, 0.0)
rl.Vertex3f(x-width/2, y-height/2, z+length/2) // Bottom Right Of The Texture and Quad
rl.TexCoord2f(1.0, 1.0)
rl.Vertex3f(x-width/2, y+height/2, z+length/2) // Top Right Of The Texture and Quad
rl.TexCoord2f(0.0, 1.0)
rl.Vertex3f(x-width/2, y+height/2, z-length/2) // Top Left Of The Texture and Quad

rl.End()
//rl.PopMatrix()

rl.SetTexture(0)
}

// DrawCubeTextureRec draws a cube with texture piece applied to all faces
func DrawCubeTextureRec(texture rl.Texture2D, source rl.Rectangle, position rl.Vector3, width, height,
length float32, color rl.Color) {

x := position.X
y := position.Y
z := position.Z

texWidth := float32(texture.Width)
texHeight := float32(texture.Height)

// Set desired texture to be enabled while drawing following vertex data
rl.SetTexture(texture.ID)

// We calculate the normalized texture coordinates for the desired texture-source-rectangle
// It means converting from (tex.width, tex.height) coordinates to [0.0f, 1.0f] equivalent
rl.Begin(rl.Quads)
rl.Color4ub(color.R, color.G, color.B, color.A)

// Front face
rl.Normal3f(0.0, 0.0, 1.0)
rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x-width/2, y-height/2, z+length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x+width/2, y-height/2, z+length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
rl.Vertex3f(x+width/2, y+height/2, z+length/2)
rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
rl.Vertex3f(x-width/2, y+height/2, z+length/2)

// Back face
rl.Normal3f(0.0, 0.0, -1.0)
rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x-width/2, y-height/2, z-length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
rl.Vertex3f(x-width/2, y+height/2, z-length/2)
rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
rl.Vertex3f(x+width/2, y+height/2, z-length/2)
rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x+width/2, y-height/2, z-length/2)

// Top face
rl.Normal3f(0.0, 1.0, 0.0)
rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
rl.Vertex3f(x-width/2, y+height/2, z-length/2)
rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x-width/2, y+height/2, z+length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x+width/2, y+height/2, z+length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
rl.Vertex3f(x+width/2, y+height/2, z-length/2)

// Bottom face
rl.Normal3f(0.0, -1.0, 0.0)
rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
rl.Vertex3f(x-width/2, y-height/2, z-length/2)
rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
rl.Vertex3f(x+width/2, y-height/2, z-length/2)
rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x+width/2, y-height/2, z+length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x-width/2, y-height/2, z+length/2)

// Right face
rl.Normal3f(1.0, 0.0, 0.0)
rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x+width/2, y-height/2, z-length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
rl.Vertex3f(x+width/2, y+height/2, z-length/2)
rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
rl.Vertex3f(x+width/2, y+height/2, z+length/2)
rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x+width/2, y-height/2, z+length/2)

// Left face
rl.Normal3f(-1.0, 0.0, 0.0)
rl.TexCoord2f(source.X/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x-width/2, y-height/2, z-length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, (source.Y+source.Height)/texHeight)
rl.Vertex3f(x-width/2, y-height/2, z+length/2)
rl.TexCoord2f((source.X+source.Width)/texWidth, source.Y/texHeight)
rl.Vertex3f(x-width/2, y+height/2, z+length/2)
rl.TexCoord2f(source.X/texWidth, source.Y/texHeight)
rl.Vertex3f(x-width/2, y+height/2, z-length/2)

rl.End()

rl.SetTexture(0)
}
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