mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
108 lines
2.7 KiB
Go
108 lines
2.7 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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// +build !js
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package ebiten
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import (
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"math"
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"unsafe"
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"github.com/hajimehoshi/ebiten/internal/endian"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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func floatsToInt16s(xs ...float64) []int16 {
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r := make([]int16, 0, len(xs)*2)
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for _, x := range xs {
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x32 := float32(x)
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n := *(*uint32)(unsafe.Pointer(&x32))
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if endian.IsLittle() {
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r = append(r, int16(n), int16(n>>16))
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} else {
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r = append(r, int16(n>>16), int16(n))
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}
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}
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return r
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}
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func u(x, width2p int) int16 {
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return int16(math.MaxInt16 * x / width2p)
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}
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func v(y, height2p int) int16 {
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return int16(math.MaxInt16 * y / height2p)
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}
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func vertices(parts ImageParts, width, height int, geo *GeoM) []int16 {
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// TODO: This function should be in graphics package?
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totalSize := graphics.QuadVertexSizeInBytes() / 2
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oneSize := totalSize / 4
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l := parts.Len()
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vs := make([]int16, l*totalSize)
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width2p := graphics.NextPowerOf2Int(width)
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height2p := graphics.NextPowerOf2Int(height)
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geo16 := floatsToInt16s(geo.Element(0, 0),
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geo.Element(0, 1),
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geo.Element(1, 0),
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geo.Element(1, 1),
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geo.Element(0, 2),
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geo.Element(1, 2))
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n := 0
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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 := int16(dx0), int16(dy0), int16(dx1), int16(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 := u(sx0, width2p), v(sy0, height2p), u(sx1, width2p), v(sy1, height2p)
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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 geo16 {
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vs[offset+4+j] = g
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}
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vs[offset+oneSize] = x1
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vs[offset+oneSize+1] = y0
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vs[offset+oneSize+2] = u1
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vs[offset+oneSize+3] = v0
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for j, g := range geo16 {
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vs[offset+oneSize+4+j] = g
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}
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vs[offset+2*oneSize] = x0
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vs[offset+2*oneSize+1] = y1
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vs[offset+2*oneSize+2] = u0
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vs[offset+2*oneSize+3] = v1
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for j, g := range geo16 {
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vs[offset+2*oneSize+4+j] = g
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}
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vs[offset+3*oneSize] = x1
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vs[offset+3*oneSize+1] = y1
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vs[offset+3*oneSize+2] = u1
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vs[offset+3*oneSize+3] = v1
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for j, g := range geo16 {
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vs[offset+3*oneSize+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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