mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
133 lines
3.0 KiB
Go
133 lines
3.0 KiB
Go
// Copyright 2016 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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"github.com/hajimehoshi/ebiten/internal/math"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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)
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var (
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// maxTextureSize is the maximum texture size
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//
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// maxTextureSize also represents the default size (width or height) of viewport.
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maxTextureSize = 0
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)
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// MaxImageSize returns the maximum of width/height of an image.
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func MaxImageSize() int {
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if maxTextureSize == 0 {
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maxTextureSize = opengl.GetContext().MaxTextureSize()
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if maxTextureSize == 0 {
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panic("graphics: failed to get the max texture size")
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}
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}
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s := maxTextureSize
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return s
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}
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// Image represents an image that is implemented with OpenGL.
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type Image struct {
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texture *texture
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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 {
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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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c := &newImageCommand{
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result: i,
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width: width,
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height: height,
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}
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theCommandQueue.Enqueue(c)
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return i
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}
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func NewScreenFramebufferImage(width, height int) *Image {
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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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c := &newScreenFramebufferImageCommand{
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result: i,
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width: width,
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height: height,
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}
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theCommandQueue.Enqueue(c)
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return i
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}
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func (i *Image) Dispose() {
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c := &disposeCommand{
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target: i,
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}
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theCommandQueue.Enqueue(c)
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}
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func (i *Image) Size() (int, int) {
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return i.width, i.height
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}
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func (i *Image) DrawImage(src *Image, vertices []float32, indices []uint16, mode opengl.CompositeMode, filter Filter) {
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theCommandQueue.EnqueueDrawImageCommand(i, src, vertices, indices, mode, filter)
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}
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// Pixels returns the image's pixels.
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// Pixels might return nil when OpenGL error happens.
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func (i *Image) Pixels() []byte {
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c := &pixelsCommand{
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result: nil,
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img: i,
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}
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theCommandQueue.Enqueue(c)
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theCommandQueue.Flush()
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return c.result
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}
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func (i *Image) ReplacePixels(p []byte, x, y, width, height int) {
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pixels := make([]byte, len(p))
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copy(pixels, p)
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c := &replacePixelsCommand{
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dst: i,
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pixels: pixels,
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x: x,
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y: y,
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width: width,
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height: height,
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}
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theCommandQueue.Enqueue(c)
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}
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func (i *Image) IsInvalidated() bool {
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return !opengl.GetContext().IsTexture(i.texture.native)
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}
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func (i *Image) createFramebufferIfNeeded() (*framebuffer, error) {
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if i.framebuffer != nil {
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return i.framebuffer, nil
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}
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f, err := newFramebufferFromTexture(i.texture, math.NextPowerOf2Int(i.width), math.NextPowerOf2Int(i.height))
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if err != nil {
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return nil, err
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}
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i.framebuffer = f
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return i.framebuffer, nil
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}
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