57 lines
1.8 KiB
Go
57 lines
1.8 KiB
Go
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package main
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import (
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"image"
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"image/color"
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"renderer1/hrend"
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)
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func Checkerboard(cols []color.Color, size int) image.Image {
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result := image.NewRGBA(image.Rect(0, 0, size, size))
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for y := range size {
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for x := range size {
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result.Set(x, y, cols[(x+y)%len(cols)])
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}
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}
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return result
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}
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func FlatTerrain(size int) *hrend.ObjModel {
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result := hrend.ObjModel{
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Vertices: make([]hrend.Vec3f, 0),
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VTexture: make([]hrend.Vec3f, 4),
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Faces: make([]hrend.Facef, 0),
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}
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// For the simple square terrain, there aren't a lot of texture coords...
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result.VTexture[0] = hrend.Vec3f{X: 0, Y: 0, Z: 0}
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result.VTexture[1] = hrend.Vec3f{X: 1, Y: 0, Z: 0}
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result.VTexture[2] = hrend.Vec3f{X: 0, Y: 1, Z: 0}
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result.VTexture[3] = hrend.Vec3f{X: 1, Y: 1, Z: 0}
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// Generate all the simple vertices along the plane at y=0
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for z := -size; z <= size; z++ {
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for x := -size; x <= size; x++ {
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result.Vertices = append(result.Vertices, hrend.Vec3f{X: float32(x), Y: 0, Z: float32(z)})
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}
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}
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// Faces are slightly different; we generate two for every "cell" inside the vertices
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for z := 0; z < size*2; z++ {
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for x := 0; x < size*2; x++ {
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topleft := x + z*size*2
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topright := x + 1 + z*size*2
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bottomleft := x + (z+1)*size*2
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bottomright := x + 1 + (z+1)*size*2
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// remember to wind counter-clockwise
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result.Faces = append(result.Faces, hrend.Facef{
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hrend.Vertex{Pos: result.Vertices[topleft], Tex: result.VTexture[0]},
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hrend.Vertex{Pos: result.Vertices[bottomleft], Tex: result.VTexture[2]},
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hrend.Vertex{Pos: result.Vertices[topright], Tex: result.VTexture[1]},
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}, hrend.Facef{
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hrend.Vertex{Pos: result.Vertices[topright], Tex: result.VTexture[1]},
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hrend.Vertex{Pos: result.Vertices[bottomleft], Tex: result.VTexture[2]},
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hrend.Vertex{Pos: result.Vertices[bottomright], Tex: result.VTexture[3]},
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})
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}
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}
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return &result
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}
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