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https://github.com/hajimehoshi/ebiten.git
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f3cdb0537b
Now restorable/sharable packages cannot use the same vertices backend, but I think this won't affect the performance significantly.
44 lines
1.6 KiB
Go
44 lines
1.6 KiB
Go
// Copyright 2017 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 graphics
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const (
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IndicesNum = (1 << 16) / 3 * 3 // Adjust num for triangles.
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VertexFloatNum = 12
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)
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type VertexPutter interface {
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PutVertex(dst []float32, dx, dy, sx, sy float32, bx0, by0, bx1, by1 float32, cr, cg, cb, ca float32)
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}
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func PutQuadVertices(dst []float32, putter VertexPutter, sx0, sy0, sx1, sy1 int, a, b, c, d, tx, ty float32, cr, cg, cb, ca float32) {
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x := float32(sx1 - sx0)
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y := float32(sy1 - sy0)
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ax, by, cx, dy := a*x, b*y, c*x, d*y
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u0, v0, u1, v1 := float32(sx0), float32(sy0), float32(sx1), float32(sy1)
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putter.PutVertex(dst[:VertexFloatNum], tx, ty, u0, v0, u0, v0, u1, v1, cr, cg, cb, ca)
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putter.PutVertex(dst[VertexFloatNum:2*VertexFloatNum], ax+tx, cx+ty, u1, v0, u0, v0, u1, v1, cr, cg, cb, ca)
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putter.PutVertex(dst[2*VertexFloatNum:3*VertexFloatNum], by+tx, dy+ty, u0, v1, u0, v0, u1, v1, cr, cg, cb, ca)
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putter.PutVertex(dst[3*VertexFloatNum:4*VertexFloatNum], ax+by+tx, cx+dy+ty, u1, v1, u0, v0, u1, v1, cr, cg, cb, ca)
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}
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var (
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quadIndices = []uint16{0, 1, 2, 1, 2, 3}
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)
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func QuadIndices() []uint16 {
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return quadIndices
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}
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