mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
137 lines
3.6 KiB
Go
137 lines
3.6 KiB
Go
/*
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Copyright 2014 Hajime Hoshi
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package ebiten
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import (
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"github.com/go-gl/gl"
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"github.com/hajimehoshi/ebiten/internal"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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"github.com/hajimehoshi/ebiten/internal/opengl/internal/shader"
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"image/color"
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)
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type innerImage struct {
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// TODO: Rename them later.
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glRenderTarget *opengl.Image
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glTexture *opengl.Texture
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}
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func newInnerImage(glTexture *opengl.Texture, filter int) (*innerImage, error) {
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glRenderTarget, err := opengl.NewRenderTargetFromTexture(glTexture)
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if err != nil {
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return nil, err
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}
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return &innerImage{glRenderTarget, glTexture}, nil
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}
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func (r *innerImage) size() (width, height int) {
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return r.glRenderTarget.Size()
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}
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func (r *innerImage) Clear() error {
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return r.Fill(color.Transparent)
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}
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func (r *innerImage) Fill(clr color.Color) error {
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if err := r.glRenderTarget.SetAsViewport(); err != nil {
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return err
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}
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rf, gf, bf, af := internal.RGBA(clr)
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gl.ClearColor(gl.GLclampf(rf), gl.GLclampf(gf), gl.GLclampf(bf), gl.GLclampf(af))
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gl.Clear(gl.COLOR_BUFFER_BIT)
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return nil
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}
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func (r *innerImage) drawImage(image *innerImage, parts []ImagePart, geo GeometryMatrix, color ColorMatrix) error {
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if err := r.glRenderTarget.SetAsViewport(); err != nil {
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return err
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}
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w, h := image.glTexture.Size()
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quads := textureQuads(parts, w, h)
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targetNativeTexture := gl.Texture(0)
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if r.glTexture != nil {
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targetNativeTexture = r.glTexture.Native()
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}
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w2, h2 := r.size()
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projectionMatrix := r.glRenderTarget.ProjectionMatrix()
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shader.DrawTexture(image.glTexture.Native(), targetNativeTexture, w2, h2, projectionMatrix, quads, &geo, &color)
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return nil
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}
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func u(x float64, width int) float32 {
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return float32(x) / float32(internal.NextPowerOf2Int(width))
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}
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func v(y float64, height int) float32 {
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return float32(y) / float32(internal.NextPowerOf2Int(height))
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}
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func textureQuads(parts []ImagePart, width, height int) []shader.TextureQuad {
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quads := make([]shader.TextureQuad, 0, len(parts))
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for _, part := range parts {
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x1 := float32(part.Dst.X)
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x2 := float32(part.Dst.X + part.Dst.Width)
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y1 := float32(part.Dst.Y)
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y2 := float32(part.Dst.Y + part.Dst.Height)
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u1 := u(part.Src.X, width)
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u2 := u(part.Src.X+part.Src.Width, width)
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v1 := v(part.Src.Y, height)
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v2 := v(part.Src.Y+part.Src.Height, height)
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quad := shader.TextureQuad{x1, x2, y1, y2, u1, u2, v1, v2}
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quads = append(quads, quad)
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}
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return quads
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}
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type syncer interface {
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Sync(func())
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}
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type Image struct {
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syncer syncer
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inner *innerImage
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}
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func (r *Image) Size() (width, height int) {
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return r.inner.size()
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}
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func (r *Image) Clear() (err error) {
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r.syncer.Sync(func() {
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err = r.inner.Clear()
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})
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return
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}
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func (r *Image) Fill(clr color.Color) (err error) {
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r.syncer.Sync(func() {
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err = r.inner.Fill(clr)
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})
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return
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}
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func (r *Image) DrawImage(image *Image, parts []ImagePart, geo GeometryMatrix, color ColorMatrix) (err error) {
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return r.drawImage(image.inner, parts, geo, color)
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}
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func (r *Image) drawImage(image *innerImage, parts []ImagePart, geo GeometryMatrix, color ColorMatrix) (err error) {
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r.syncer.Sync(func() {
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err = r.inner.drawImage(image, parts, geo, color)
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})
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return
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}
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