ebiten/internal/graphics/command.go

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// Copyright 2016 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package graphics
import (
"errors"
"fmt"
"image"
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"image/color"
"math"
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"sync"
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"github.com/hajimehoshi/ebiten/internal/affine"
"github.com/hajimehoshi/ebiten/internal/opengl"
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)
type command interface {
Exec(context *opengl.Context, indexOffsetInBytes int) error
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}
type commandQueue struct {
commands []command
vertices []float32
verticesNum int
m sync.Mutex
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}
var theCommandQueue = &commandQueue{
commands: []command{},
vertices: []float32{},
}
func (q *commandQueue) AppendVertices(vertices []float32) {
q.m.Lock()
defer q.m.Unlock()
if len(q.vertices) < q.verticesNum+len(vertices) {
n := q.verticesNum + len(vertices) - len(q.vertices)
q.vertices = append(q.vertices, make([]float32, n)...)
}
copy(q.vertices[q.verticesNum:q.verticesNum+len(vertices)], vertices)
q.verticesNum += len(vertices)
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}
func (q *commandQueue) Enqueue(command command) {
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q.m.Lock()
defer q.m.Unlock()
if 0 < len(q.commands) {
if c1, ok := q.commands[len(q.commands)-1].(*drawImageCommand); ok {
if c2, ok := command.(*drawImageCommand); ok {
if c1.isMergeable(c2) {
c1.verticesNum += c2.verticesNum
return
}
}
}
}
q.commands = append(q.commands, command)
}
// commandGroups separates q.commands into some groups.
// The number of quads of drawImageCommand in one groups must be equal to or less than
// its limit (maxQuads).
func (q *commandQueue) commandGroups() [][]command {
cs := q.commands
gs := [][]command{}
quads := 0
for 0 < len(cs) {
if len(gs) == 0 {
gs = append(gs, []command{})
}
c := cs[0]
switch c := c.(type) {
case *drawImageCommand:
if maxQuads >= quads+c.quadsNum() {
quads += c.quadsNum()
break
}
cc := c.split(maxQuads - quads)
gs[len(gs)-1] = append(gs[len(gs)-1], cc[0])
cs[0] = cc[1]
quads = 0
gs = append(gs, []command{})
continue
}
gs[len(gs)-1] = append(gs[len(gs)-1], c)
cs = cs[1:]
}
return gs
}
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func (q *commandQueue) Flush(context *opengl.Context) error {
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q.m.Lock()
defer q.m.Unlock()
// glViewport must be called at least at every frame on iOS.
context.ResetViewportSize()
n := 0
lastN := 0
for _, g := range q.commandGroups() {
for _, c := range g {
switch c := c.(type) {
case *drawImageCommand:
n += c.verticesNum
}
}
if 0 < n-lastN {
context.BufferSubData(opengl.ArrayBuffer, q.vertices[lastN:n])
}
// NOTE: WebGL doesn't seem to have Check gl.MAX_ELEMENTS_VERTICES or gl.MAX_ELEMENTS_INDICES so far.
// Let's use them to compare to len(quads) in the future.
if maxQuads < (n-lastN)*opengl.Float.SizeInBytes()/QuadVertexSizeInBytes() {
return fmt.Errorf("len(quads) must be equal to or less than %d", maxQuads)
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}
numc := len(g)
indexOffsetInBytes := 0
for _, c := range g {
if err := c.Exec(context, indexOffsetInBytes); err != nil {
return err
}
if c, ok := c.(*drawImageCommand); ok {
n := c.verticesNum * opengl.Float.SizeInBytes() / QuadVertexSizeInBytes()
indexOffsetInBytes += 6 * n * 2
}
}
if 0 < numc {
// Call glFlush to prevent black flicking (especially on Android (#226) and iOS).
context.Flush()
}
lastN = n
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}
q.commands = []command{}
q.verticesNum = 0
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return nil
}
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func FlushCommands(context *opengl.Context) error {
return theCommandQueue.Flush(context)
}
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type fillCommand struct {
dst *Image
color color.RGBA
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}
func (c *fillCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
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f, err := c.dst.createFramebufferIfNeeded(context)
if err != nil {
return err
}
if err := f.setAsViewport(context); err != nil {
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return err
}
cr, cg, cb, ca := c.color.R, c.color.G, c.color.B, c.color.A
const max = math.MaxUint8
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r := float64(cr) / max
g := float64(cg) / max
b := float64(cb) / max
a := float64(ca) / max
return context.FillFramebuffer(r, g, b, a)
}
type drawImageCommand struct {
dst *Image
src *Image
verticesNum int
color affine.ColorM
mode opengl.CompositeMode
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}
func QuadVertexSizeInBytes() int {
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return 4 * theArrayBufferLayout.totalBytes()
}
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func (c *drawImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
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f, err := c.dst.createFramebufferIfNeeded(context)
if err != nil {
return err
}
if err := f.setAsViewport(context); err != nil {
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return err
}
context.BlendFunc(c.mode)
n := c.quadsNum()
if n == 0 {
return nil
}
_, h := c.dst.Size()
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proj := f.projectionMatrix(h)
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p := &programContext{
state: &theOpenGLState,
program: theOpenGLState.programTexture,
context: context,
projectionMatrix: proj,
texture: c.src.texture.native,
colorM: c.color,
}
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if err := p.begin(); err != nil {
return err
}
// TODO: We should call glBindBuffer here?
// The buffer is already bound at begin() but it is counterintuitive.
context.DrawElements(opengl.Triangles, 6*n, indexOffsetInBytes)
return nil
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}
func (c *drawImageCommand) split(quadsNum int) [2]*drawImageCommand {
c1 := *c
c2 := *c
s := opengl.Float.SizeInBytes()
n := quadsNum * QuadVertexSizeInBytes() / s
c1.verticesNum = n
c2.verticesNum -= n
return [2]*drawImageCommand{&c1, &c2}
}
func (c *drawImageCommand) isMergeable(other *drawImageCommand) bool {
if c.dst != other.dst {
return false
}
if c.src != other.src {
return false
}
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if !c.color.Equals(&other.color) {
return false
}
if c.mode != other.mode {
return false
}
return true
}
func (c *drawImageCommand) quadsNum() int {
return c.verticesNum * opengl.Float.SizeInBytes() / QuadVertexSizeInBytes()
}
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type replacePixelsCommand struct {
dst *Image
pixels []uint8
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}
func (c *replacePixelsCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
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f, err := c.dst.createFramebufferIfNeeded(context)
if err != nil {
return err
}
if err := f.setAsViewport(context); err != nil {
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return err
}
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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).
// This is needed even after fixing a shader bug at f537378f2a6a8ef56e1acf1c03034967b77c7b51.
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if err := context.FillFramebuffer(0, 0, 0.5, 1); err != nil {
return err
}
// This is necessary on Android. We can't call glClear just before glTexSubImage2D without
// 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.
// TODO: Can we have a better way like optimizing commands?
context.Flush()
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if err := context.BindTexture(c.dst.texture.native); err != nil {
return err
}
context.TexSubImage2D(c.pixels, c.dst.width, c.dst.height)
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return nil
}
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type disposeCommand struct {
target *Image
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}
func (c *disposeCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
if c.target.framebuffer != nil {
context.DeleteFramebuffer(c.target.framebuffer.native)
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}
if c.target.texture != nil {
context.DeleteTexture(c.target.texture.native)
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}
return nil
}
type newImageFromImageCommand struct {
result *Image
img *image.RGBA
filter opengl.Filter
}
func (c *newImageFromImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
origSize := c.img.Bounds().Size()
if origSize.X < 1 {
return errors.New("graphics: width must be equal or more than 1.")
}
if origSize.Y < 1 {
return errors.New("graphics: height must be equal or more than 1.")
}
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w, h := c.img.Bounds().Size().X, c.img.Bounds().Size().Y
if c.img.Bounds() != image.Rect(0, 0, NextPowerOf2Int(w), NextPowerOf2Int(h)) {
panic(fmt.Sprintf("graphics: invalid image bounds: %v", c.img.Bounds()))
}
native, err := context.NewTexture(w, h, c.img.Pix, c.filter)
if err != nil {
return err
}
c.result.texture = &texture{
native: native,
}
return nil
}
type newImageCommand struct {
result *Image
width int
height int
filter opengl.Filter
}
func (c *newImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
w := NextPowerOf2Int(c.width)
h := NextPowerOf2Int(c.height)
if w < 1 {
return errors.New("graphics: width must be equal or more than 1.")
}
if h < 1 {
return errors.New("graphics: height must be equal or more than 1.")
}
native, err := context.NewTexture(w, h, nil, c.filter)
if err != nil {
return err
}
c.result.texture = &texture{
native: native,
}
return nil
}
type newScreenFramebufferImageCommand struct {
result *Image
width int
height int
}
func (c *newScreenFramebufferImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
if c.width < 1 {
return errors.New("graphics: width must be equal or more than 1.")
}
if c.height < 1 {
return errors.New("graphics: height must be equal or more than 1.")
}
f := &framebuffer{
native: context.ScreenFramebuffer(),
flipY: true,
}
c.result.framebuffer = f
return nil
}