mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
384 lines
9.7 KiB
Go
384 lines
9.7 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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"errors"
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"fmt"
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"image"
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"image/color"
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"math"
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"github.com/hajimehoshi/ebiten/internal/affine"
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emath "github.com/hajimehoshi/ebiten/internal/math"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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"github.com/hajimehoshi/ebiten/internal/sync"
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)
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type command interface {
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Exec(indexOffsetInBytes int) error
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}
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type commandQueue struct {
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commands []command
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vertices []float32
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verticesNum int
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m sync.Mutex
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}
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var theCommandQueue = &commandQueue{}
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func (q *commandQueue) appendVertices(vertices []float32) {
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if len(q.vertices) < q.verticesNum+len(vertices) {
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n := q.verticesNum + len(vertices) - len(q.vertices)
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q.vertices = append(q.vertices, make([]float32, n)...)
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}
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// for-loop might be faster than copy:
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// On GopherJS, copy might cause subarray calls.
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for i := 0; i < len(vertices); i++ {
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q.vertices[q.verticesNum+i] = vertices[i]
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}
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q.verticesNum += len(vertices)
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}
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func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, clr *affine.ColorM, mode opengl.CompositeMode) {
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// Avoid defer for performance
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q.m.Lock()
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q.appendVertices(vertices)
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if 0 < len(q.commands) {
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if c, ok := q.commands[len(q.commands)-1].(*drawImageCommand); ok {
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if c.isMergeable(dst, src, clr, mode) {
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c.verticesNum += len(vertices)
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q.m.Unlock()
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return
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}
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}
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}
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c := &drawImageCommand{
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dst: dst,
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src: src,
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verticesNum: len(vertices),
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color: *clr,
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mode: mode,
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}
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q.commands = append(q.commands, c)
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q.m.Unlock()
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}
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func (q *commandQueue) Enqueue(command command) {
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q.m.Lock()
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q.commands = append(q.commands, command)
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q.m.Unlock()
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}
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// commandGroups separates q.commands into some groups.
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// The number of quads of drawImageCommand in one groups must be equal to or less than
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// its limit (maxQuads).
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func (q *commandQueue) commandGroups() [][]command {
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cs := q.commands
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var gs [][]command
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quads := 0
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for 0 < len(cs) {
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if len(gs) == 0 {
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gs = append(gs, []command{})
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}
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c := cs[0]
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switch c := c.(type) {
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case *drawImageCommand:
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if maxQuads >= quads+c.quadsNum() {
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quads += c.quadsNum()
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break
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}
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cc := c.split(maxQuads - quads)
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gs[len(gs)-1] = append(gs[len(gs)-1], cc[0])
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cs[0] = cc[1]
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quads = 0
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gs = append(gs, []command{})
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continue
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}
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gs[len(gs)-1] = append(gs[len(gs)-1], c)
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cs = cs[1:]
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}
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return gs
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}
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func (q *commandQueue) Flush() error {
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q.m.Lock()
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defer q.m.Unlock()
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// glViewport must be called at least at every frame on iOS.
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opengl.GetContext().ResetViewportSize()
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n := 0
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lastN := 0
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for _, g := range q.commandGroups() {
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for _, c := range g {
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switch c := c.(type) {
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case *drawImageCommand:
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n += c.verticesNum
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}
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}
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if 0 < n-lastN {
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opengl.GetContext().BufferSubData(opengl.ArrayBuffer, q.vertices[lastN:n])
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}
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// NOTE: WebGL doesn't seem to have Check gl.MAX_ELEMENTS_VERTICES or gl.MAX_ELEMENTS_INDICES so far.
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// Let's use them to compare to len(quads) in the future.
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if maxQuads < (n-lastN)*opengl.Float.SizeInBytes()/QuadVertexSizeInBytes() {
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return fmt.Errorf("len(quads) must be equal to or less than %d", maxQuads)
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}
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numc := len(g)
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indexOffsetInBytes := 0
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for _, c := range g {
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if err := c.Exec(indexOffsetInBytes); err != nil {
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return err
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}
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if c, ok := c.(*drawImageCommand); ok {
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n := c.verticesNum * opengl.Float.SizeInBytes() / QuadVertexSizeInBytes()
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indexOffsetInBytes += 6 * n * 2
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}
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}
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if 0 < numc {
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// Call glFlush to prevent black flicking (especially on Android (#226) and iOS).
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opengl.GetContext().Flush()
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}
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lastN = n
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}
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q.commands = nil
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q.verticesNum = 0
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return nil
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}
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func FlushCommands() error {
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return theCommandQueue.Flush()
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}
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type fillCommand struct {
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dst *Image
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color color.RGBA
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}
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func (c *fillCommand) Exec(indexOffsetInBytes int) error {
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f, err := c.dst.createFramebufferIfNeeded()
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if err != nil {
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return err
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}
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if err := f.setAsViewport(); err != nil {
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return err
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}
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cr, cg, cb, ca := c.color.R, c.color.G, c.color.B, c.color.A
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const max = math.MaxUint8
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r := float64(cr) / max
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g := float64(cg) / max
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b := float64(cb) / max
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a := float64(ca) / max
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return opengl.GetContext().FillFramebuffer(r, g, b, a)
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}
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type drawImageCommand struct {
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dst *Image
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src *Image
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verticesNum int
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color affine.ColorM
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mode opengl.CompositeMode
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}
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func QuadVertexSizeInBytes() int {
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return 4 * theArrayBufferLayout.totalBytes()
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}
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func (c *drawImageCommand) Exec(indexOffsetInBytes int) error {
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f, err := c.dst.createFramebufferIfNeeded()
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if err != nil {
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return err
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}
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if err := f.setAsViewport(); err != nil {
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return err
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}
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opengl.GetContext().BlendFunc(c.mode)
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n := c.quadsNum()
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if n == 0 {
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return nil
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}
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_, h := c.dst.Size()
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proj := f.projectionMatrix(h)
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p := &programContext{
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state: &theOpenGLState,
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program: theOpenGLState.programTexture,
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projectionMatrix: proj,
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texture: c.src.texture.native,
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colorM: c.color,
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}
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if err := p.begin(); err != nil {
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return err
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}
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// TODO: We should call glBindBuffer here?
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// The buffer is already bound at begin() but it is counterintuitive.
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opengl.GetContext().DrawElements(opengl.Triangles, 6*n, indexOffsetInBytes)
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return nil
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}
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func (c *drawImageCommand) split(quadsNum int) [2]*drawImageCommand {
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c1 := *c
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c2 := *c
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s := opengl.Float.SizeInBytes()
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n := quadsNum * QuadVertexSizeInBytes() / s
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c1.verticesNum = n
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c2.verticesNum -= n
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return [2]*drawImageCommand{&c1, &c2}
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}
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func (c *drawImageCommand) isMergeable(dst, src *Image, clr *affine.ColorM, mode opengl.CompositeMode) bool {
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if c.dst != dst {
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return false
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}
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if c.src != src {
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return false
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}
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if !c.color.Equals(clr) {
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return false
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}
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if c.mode != mode {
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return false
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}
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return true
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}
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func (c *drawImageCommand) quadsNum() int {
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return c.verticesNum * opengl.Float.SizeInBytes() / QuadVertexSizeInBytes()
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}
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type replacePixelsCommand struct {
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dst *Image
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pixels []uint8
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}
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func (c *replacePixelsCommand) Exec(indexOffsetInBytes int) error {
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f, err := c.dst.createFramebufferIfNeeded()
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if err != nil {
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return err
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}
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if err := f.setAsViewport(); err != nil {
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return err
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}
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// Filling with non black or white color is required here for glTexSubImage2D.
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// Very mysterious but this actually works (Issue #186).
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// This is needed even after fixing a shader bug at f537378f2a6a8ef56e1acf1c03034967b77c7b51.
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if err := opengl.GetContext().FillFramebuffer(0, 0, 0.5, 1); err != nil {
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return err
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}
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// This is necessary on Android. We can't call glClear just before glTexSubImage2D without
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// glFlush. glTexSubImage2D didn't work without this hack at least on Nexus 5x (#211).
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// This also happens when a fillCommand precedes a replacePixelsCommand.
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// TODO: Can we have a better way like optimizing commands?
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opengl.GetContext().Flush()
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if err := opengl.GetContext().BindTexture(c.dst.texture.native); err != nil {
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return err
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}
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opengl.GetContext().TexSubImage2D(c.pixels, emath.NextPowerOf2Int(c.dst.width), emath.NextPowerOf2Int(c.dst.height))
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return nil
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}
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type disposeCommand struct {
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target *Image
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}
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func (c *disposeCommand) Exec(indexOffsetInBytes int) error {
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if c.target.framebuffer != nil {
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opengl.GetContext().DeleteFramebuffer(c.target.framebuffer.native)
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}
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if c.target.texture != nil {
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opengl.GetContext().DeleteTexture(c.target.texture.native)
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}
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return nil
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}
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type newImageFromImageCommand struct {
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result *Image
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img *image.RGBA
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filter opengl.Filter
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}
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func (c *newImageFromImageCommand) Exec(indexOffsetInBytes int) error {
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origSize := c.img.Bounds().Size()
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if origSize.X < 1 {
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return errors.New("graphics: width must be equal or more than 1.")
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}
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if origSize.Y < 1 {
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return errors.New("graphics: height must be equal or more than 1.")
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}
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w, h := c.img.Bounds().Size().X, c.img.Bounds().Size().Y
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if c.img.Bounds() != image.Rect(0, 0, emath.NextPowerOf2Int(w), emath.NextPowerOf2Int(h)) {
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panic(fmt.Sprintf("graphics: invalid image bounds: %v", c.img.Bounds()))
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}
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native, err := opengl.GetContext().NewTexture(w, h, c.img.Pix, c.filter)
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if err != nil {
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return err
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}
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c.result.texture = &texture{
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native: native,
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}
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return nil
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}
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type newImageCommand struct {
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result *Image
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width int
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height int
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filter opengl.Filter
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}
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func (c *newImageCommand) Exec(indexOffsetInBytes int) error {
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w := emath.NextPowerOf2Int(c.width)
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h := emath.NextPowerOf2Int(c.height)
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if w < 1 {
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return errors.New("graphics: width must be equal or more than 1.")
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}
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if h < 1 {
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return errors.New("graphics: height must be equal or more than 1.")
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}
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native, err := opengl.GetContext().NewTexture(w, h, nil, c.filter)
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if err != nil {
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return err
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}
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c.result.texture = &texture{
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native: native,
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}
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return nil
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}
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type newScreenFramebufferImageCommand struct {
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result *Image
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width int
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height int
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offsetX float64
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offsetY float64
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}
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func (c *newScreenFramebufferImageCommand) Exec(indexOffsetInBytes int) error {
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if c.width < 1 {
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return errors.New("graphics: width must be equal or more than 1.")
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}
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if c.height < 1 {
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return errors.New("graphics: height must be equal or more than 1.")
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}
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f := &framebuffer{
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native: opengl.GetContext().ScreenFramebuffer(),
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flipY: true,
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offsetX: c.offsetX,
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offsetY: c.offsetY,
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}
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c.result.framebuffer = f
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return nil
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}
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