mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
136 lines
3.2 KiB
Go
136 lines
3.2 KiB
Go
// Copyright 2014 Hajime Hoshi
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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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import (
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"image/color"
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"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
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)
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func orthoProjectionMatrix(left, right, bottom, top int) *[4][4]float64 {
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e11 := float64(2) / float64(right-left)
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e22 := float64(2) / float64(top-bottom)
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e14 := -1 * float64(right+left) / float64(right-left)
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e24 := -1 * float64(top+bottom) / float64(top-bottom)
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return &[4][4]float64{
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{e11, 0, 0, e14},
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{0, e22, 0, e24},
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{0, 0, 1, 0},
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{0, 0, 0, 1},
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}
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}
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type Framebuffer struct {
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native opengl.Framebuffer
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width int
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height int
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flipY bool
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proMatrix *[4][4]float64
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}
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func NewZeroFramebuffer(width, height int) (*Framebuffer, error) {
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f := &Framebuffer{
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width: width,
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height: height,
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flipY: true,
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}
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return f, nil
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}
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func (f *Framebuffer) initFromTexture(context *opengl.Context, texture *Texture) error {
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native, err := context.NewFramebuffer(opengl.Texture(texture.native))
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if err != nil {
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return err
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}
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f.native = native
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f.width = texture.width
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f.height = texture.height
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return nil
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}
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func Dispose(texture *Texture, framebuffer *Framebuffer) error {
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c := &disposeCommand{
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framebuffer: framebuffer,
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texture: texture,
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}
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theCommandQueue.Enqueue(c)
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return nil
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}
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const viewportSize = 4096
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func (f *Framebuffer) setAsViewport(c *opengl.Context) error {
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width := viewportSize
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height := viewportSize
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return c.SetViewport(f.native, width, height)
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}
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func (f *Framebuffer) projectionMatrix() *[4][4]float64 {
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if f.proMatrix != nil {
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return f.proMatrix
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}
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width := viewportSize
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height := viewportSize
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m := orthoProjectionMatrix(0, width, 0, height)
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if f.flipY {
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m[1][1] *= -1
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m[1][3] += float64(f.height) / float64(height) * 2
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}
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f.proMatrix = m
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return f.proMatrix
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}
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func (f *Framebuffer) Fill(clr color.Color) error {
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c := &fillCommand{
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dst: f,
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color: clr,
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}
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theCommandQueue.Enqueue(c)
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return nil
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}
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func (f *Framebuffer) DrawTexture(t *Texture, vertices []int16, geo, clr Matrix, mode opengl.CompositeMode) error {
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c := &drawImageCommand{
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dst: f,
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src: t,
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vertices: vertices,
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geo: geo,
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color: clr,
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mode: mode,
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}
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theCommandQueue.Enqueue(c)
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return nil
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}
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func (f *Framebuffer) Pixels(context *opengl.Context) ([]uint8, error) {
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// Flush the enqueued commands so that pixels are certainly read.
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if err := theCommandQueue.Flush(context); err != nil {
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return nil, err
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}
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return context.FramebufferPixels(f.native, f.width, f.height)
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}
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func (f *Framebuffer) ReplacePixels(t *Texture, p []uint8) error {
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c := &replacePixelsCommand{
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dst: f,
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texture: t,
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pixels: p,
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}
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theCommandQueue.Enqueue(c)
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return nil
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}
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