mirror of
https://github.com/hajimehoshi/ebiten.git
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261 lines
6.9 KiB
Go
261 lines
6.9 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 graphicscommand
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import (
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"fmt"
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"image"
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"io"
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"sort"
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"strconv"
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"strings"
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"github.com/hajimehoshi/ebiten/v2/internal/debug"
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"github.com/hajimehoshi/ebiten/v2/internal/graphics"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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"github.com/hajimehoshi/ebiten/v2/internal/png"
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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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image graphicsdriver.Image
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width int
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height int
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internalWidth int
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internalHeight int
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screen bool
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// id is an indentifier for the image. This is used only when dummping the information.
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//
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// This is duplicated with graphicsdriver.Image's ID, but this id is still necessary because this image might not
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// have its graphicsdriver.Image.
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id int
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bufferedWP []*graphicsdriver.WritePixelsArgs
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}
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var nextID = 1
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func genNextID() int {
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id := nextID
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nextID++
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return id
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}
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// imagesWithBuffers is the set of an image with buffers.
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var imagesWithBuffers []*Image
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// addImageWithBuffer adds an image to the list of images with unflushed buffers.
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func addImageWithBuffer(img *Image) {
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imagesWithBuffers = append(imagesWithBuffers, img)
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}
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// flushImageBuffers flushes all the image buffers and send to the command queue.
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// flushImageBuffers should be called before flushing commands.
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func flushImageBuffers() {
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for i, img := range imagesWithBuffers {
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img.flushBufferedWritePixels()
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imagesWithBuffers[i] = nil
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}
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imagesWithBuffers = imagesWithBuffers[:0]
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}
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// NewImage returns a new image.
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//
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// Note that the image is not initialized yet.
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func NewImage(width, height int, screenFramebuffer bool) *Image {
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i := &Image{
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width: width,
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height: height,
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screen: screenFramebuffer,
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id: genNextID(),
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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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screen: screenFramebuffer,
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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) flushBufferedWritePixels() {
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if len(i.bufferedWP) == 0 {
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return
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}
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c := &writePixelsCommand{
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dst: i,
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args: i.bufferedWP,
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}
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theCommandQueue.Enqueue(c)
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i.bufferedWP = nil
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}
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func (i *Image) Dispose() {
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i.bufferedWP = nil
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c := &disposeImageCommand{
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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) InternalSize() (int, int) {
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if i.screen {
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return i.width, i.height
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}
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if i.internalWidth == 0 {
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i.internalWidth = graphics.InternalImageSize(i.width)
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}
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if i.internalHeight == 0 {
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i.internalHeight = graphics.InternalImageSize(i.height)
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}
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return i.internalWidth, i.internalHeight
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}
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// DrawTriangles draws triangles with the given image.
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//
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// The vertex floats are:
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//
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// 0: Destination X in pixels
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// 1: Destination Y in pixels
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// 2: Source X in texels
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// 3: Source Y in texels
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// 4: Color R [0.0-1.0]
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// 5: Color G
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// 6: Color B
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// 7: Color Y
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//
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// src and shader are exclusive and only either is non-nil.
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//
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// The elements that index is in between 2 and 7 are used for the source images.
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// The source image is 1) src argument if non-nil, or 2) an image value in the uniform variables if it exists.
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// If there are multiple images in the uniform variables, the smallest ID's value is adopted.
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//
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// If the source image is not specified, i.e., src is nil and there is no image in the uniform variables, the
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// elements for the source image are not used.
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func (i *Image) DrawTriangles(srcs [graphics.ShaderImageCount]*Image, offsets [graphics.ShaderImageCount - 1][2]float32, vertices []float32, indices []uint16, blend graphicsdriver.Blend, dstRegion, srcRegion graphicsdriver.Region, shader *Shader, uniforms [][]uint32, evenOdd bool) {
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for _, src := range srcs {
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if src == nil {
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continue
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}
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if src.screen {
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panic("graphicscommand: the screen image cannot be the rendering source")
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}
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src.flushBufferedWritePixels()
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}
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i.flushBufferedWritePixels()
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theCommandQueue.EnqueueDrawTrianglesCommand(i, srcs, offsets, vertices, indices, blend, dstRegion, srcRegion, shader, uniforms, evenOdd)
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}
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// ReadPixels reads the image's pixels.
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// ReadPixels returns an error when an error happens in the graphics driver.
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func (i *Image) ReadPixels(graphicsDriver graphicsdriver.Graphics, buf []byte, x, y, width, height int) error {
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i.flushBufferedWritePixels()
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c := &readPixelsCommand{
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img: i,
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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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result: buf,
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}
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theCommandQueue.Enqueue(c)
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if err := theCommandQueue.Flush(graphicsDriver, false); err != nil {
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return err
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}
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return nil
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}
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func (i *Image) WritePixels(pixels []byte, x, y, width, height int) {
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i.bufferedWP = append(i.bufferedWP, &graphicsdriver.WritePixelsArgs{
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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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addImageWithBuffer(i)
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}
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func (i *Image) IsInvalidated(graphicsDriver graphicsdriver.Graphics) (bool, error) {
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if i.screen {
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// The screen image might not have a texture, and in this case it is impossible to detect whether
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// the image is invalidated or not.
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return false, fmt.Errorf("graphicscommand: IsInvalidated cannot be called on the screen image")
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}
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// i.image can be nil before initializing.
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if i.image == nil {
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return false, nil
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}
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c := &isInvalidatedCommand{
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image: i,
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}
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theCommandQueue.Enqueue(c)
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if err := theCommandQueue.Flush(graphicsDriver, false); err != nil {
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return false, err
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}
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return c.result, nil
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}
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func (i *Image) dumpName(path string) string {
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return strings.ReplaceAll(path, "*", strconv.Itoa(i.id))
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}
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// dumpTo dumps the image to the specified writer.
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//
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// If blackbg is true, any alpha values in the dumped image will be 255.
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//
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// This is for testing usage.
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func (i *Image) dumpTo(w io.Writer, graphicsDriver graphicsdriver.Graphics, blackbg bool, rect image.Rectangle) error {
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if i.screen {
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return fmt.Errorf("graphicscommand: a screen image cannot be dumped")
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}
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pix := make([]byte, 4*i.width*i.height)
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if err := i.ReadPixels(graphicsDriver, pix, 0, 0, i.width, i.height); err != nil {
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return err
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}
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if blackbg {
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for i := 0; i < len(pix)/4; i++ {
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pix[4*i+3] = 0xff
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}
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}
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if err := png.Encode(w, (&image.RGBA{
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Pix: pix,
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Stride: 4 * i.width,
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Rect: image.Rect(0, 0, i.width, i.height),
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}).SubImage(rect)); err != nil {
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return err
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}
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return nil
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}
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func LogImagesInfo(images []*Image) {
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sort.Slice(images, func(a, b int) bool {
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return images[a].id < images[b].id
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})
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for _, i := range images {
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w, h := i.InternalSize()
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debug.Logf(" %d: (%d, %d)\n", i.id, w, h)
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}
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}
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