mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-12 22:17:26 +01:00
130 lines
3.2 KiB
Go
130 lines
3.2 KiB
Go
// Copyright 2018 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 opengl
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import (
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"fmt"
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"github.com/hajimehoshi/ebiten/internal/math"
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)
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func checkSize(width, height int) {
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if width < 1 {
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panic(fmt.Sprintf("opengl: width (%d) must be equal or more than 1.", width))
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}
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if height < 1 {
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panic(fmt.Sprintf("opengl: height (%d) must be equal or more than 1.", height))
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}
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m := theContext.MaxTextureSize()
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if width > m {
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panic(fmt.Sprintf("opengl: width (%d) must be less than or equal to %d", width, m))
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}
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if height > m {
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panic(fmt.Sprintf("opengl: height (%d) must be less than or equal to %d", height, m))
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}
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}
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type Image struct {
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textureNative textureNative
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framebuffer *framebuffer
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width int
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height int
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}
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func NewImage(width, height int) (*Image, error) {
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i := &Image{
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width: width,
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height: height,
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}
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w := math.NextPowerOf2Int(width)
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h := math.NextPowerOf2Int(height)
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checkSize(w, h)
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t, err := theContext.newTexture(w, h)
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if err != nil {
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return nil, err
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}
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i.textureNative = t
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return i, nil
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}
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func NewScreenFramebufferImage(width, height int) *Image {
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checkSize(width, height)
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i := &Image{
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width: width,
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height: height,
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}
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// The (default) framebuffer size can't be converted to a power of 2.
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// On browsers, c.width and c.height are used as viewport size and
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// Edge can't treat a bigger viewport than the drawing area (#71).
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i.framebuffer = newScreenFramebuffer(width, height)
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return i
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}
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func (i *Image) IsInvalidated() bool {
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return !theContext.isTexture(i.textureNative)
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}
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func (i *Image) Delete() {
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if i.framebuffer != nil {
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i.framebuffer.delete()
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}
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if i.textureNative != *new(textureNative) {
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theContext.deleteTexture(i.textureNative)
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}
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}
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func (i *Image) SetViewport() error {
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if err := i.ensureFramebuffer(); err != nil {
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return err
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}
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theContext.setViewport(i.framebuffer)
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return nil
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}
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func (i *Image) Pixels() ([]byte, error) {
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if err := i.ensureFramebuffer(); err != nil {
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return nil, err
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}
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p, err := theContext.framebufferPixels(i.framebuffer, i.width, i.height)
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if err != nil {
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return nil, err
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}
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return p, nil
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}
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func (i *Image) ProjectionMatrix() []float32 {
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if i.framebuffer == nil {
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panic("not reached")
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}
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return i.framebuffer.projectionMatrix()
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}
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func (i *Image) ensureFramebuffer() error {
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if i.framebuffer != nil {
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return nil
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}
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w, h := i.width, i.height
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f, err := newFramebufferFromTexture(i.textureNative, math.NextPowerOf2Int(w), math.NextPowerOf2Int(h))
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if err != nil {
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return err
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}
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i.framebuffer = f
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return nil
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}
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func (i *Image) TexSubImage2D(p []byte, x, y, width, height int) {
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theContext.texSubImage2D(i.textureNative, p, x, y, width, height)
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}
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