mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
90 lines
2.2 KiB
Go
90 lines
2.2 KiB
Go
// Copyright 2016 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ebiten
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import (
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"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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func vertices(parts ImageParts, width, height int, geo *GeoM) []float32 {
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// TODO: This function should be in graphics package?
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totalSize := graphics.QuadVertexSizeInBytes() / 4
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oneSize := totalSize / 4
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l := parts.Len()
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vs := make([]float32, l*totalSize)
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geos := []float32{
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float32(geo.Element(0, 0)),
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float32(geo.Element(0, 1)),
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float32(geo.Element(1, 0)),
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float32(geo.Element(1, 1)),
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float32(geo.Element(0, 2)),
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float32(geo.Element(1, 2))}
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n := 0
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w := float32(1)
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h := float32(1)
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for w < float32(width) {
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w *= 2
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}
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for h < float32(height) {
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h *= 2
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}
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for i := 0; i < l; i++ {
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dx0, dy0, dx1, dy1 := parts.Dst(i)
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if dx0 == dx1 || dy0 == dy1 {
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continue
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}
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x0, y0, x1, y1 := float32(dx0), float32(dy0), float32(dx1), float32(dy1)
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sx0, sy0, sx1, sy1 := parts.Src(i)
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if sx0 == sx1 || sy0 == sy1 {
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continue
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}
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u0, v0, u1, v1 := float32(sx0)/w, float32(sy0)/h, float32(sx1)/w, float32(sy1)/h
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offset := n * totalSize
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vs[offset] = x0
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vs[offset+1] = y0
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vs[offset+2] = u0
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vs[offset+3] = v0
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for j, g := range geos {
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vs[offset+4+j] = g
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}
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offset += oneSize
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vs[offset] = x1
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vs[offset+1] = y0
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vs[offset+2] = u1
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vs[offset+3] = v0
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for j, g := range geos {
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vs[offset+4+j] = g
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}
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offset += oneSize
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vs[offset] = x0
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vs[offset+1] = y1
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vs[offset+2] = u0
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vs[offset+3] = v1
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for j, g := range geos {
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vs[offset+4+j] = g
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}
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offset += oneSize
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vs[offset] = x1
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vs[offset+1] = y1
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vs[offset+2] = u1
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vs[offset+3] = v1
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for j, g := range geos {
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vs[offset+4+j] = g
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}
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n++
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}
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return vs[:n*totalSize]
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}
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