47 lines
1.2 KiB
Go
47 lines
1.2 KiB
Go
package render
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import (
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"github.com/pnx/go-raytracer/graphics"
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"github.com/pnx/go-raytracer/math"
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"github.com/pnx/go-raytracer/world"
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)
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func DrawColumn(ctx *graphics.Context, x int32, wall_h int32, color byte) {
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if wall_h < ctx.Height() {
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y1 := (ctx.Height() - wall_h) / 2
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y2 := (ctx.Height() + wall_h) / 2
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// Top
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// renderer.SetDrawColor(90, 90, 0, 255)
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ctx.DrawLine(x, 0, int32(x), y1, 0x1D)
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// // Middle
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// renderer.SetDrawColor(color.R, color.G, color.B, color.A)
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ctx.DrawLine(x, y1, int32(x), y2, color)
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// Bottom
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if y2 < ctx.Height() {
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// renderer.SetDrawColor(50, 50, 50, 255)
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ctx.DrawLine(x, y2, int32(x), ctx.Height(), 0x19)
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}
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return
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}
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// ctx.SetDrawColor(color.R, color.G, color.B, color.A)
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ctx.DrawLine(x, 0, int32(x), ctx.Height(), color)
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}
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func DrawScene(ctx *graphics.Context, camera math.Transform, level *world.Level) {
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for x := range ctx.Width() {
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result := CastRay(camera, level, int(x), int(ctx.Width()))
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lineHeight := int(float64(ctx.Height()) / result.Distance)
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color := level.Cell(int(result.Cell.X), int(result.Cell.Y))
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if result.Side > 0 {
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color += 0x8
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}
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DrawColumn(ctx, int32(x), int32(lineHeight), color)
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}
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}
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