ebiten/internal/graphicscommand/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.
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package graphicscommand
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import (
"fmt"
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"github.com/hajimehoshi/ebiten/internal/affine"
"github.com/hajimehoshi/ebiten/internal/graphics"
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)
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// command represents a drawing command.
//
// A command for drawing that is created when Image functions are called like DrawImage,
// or Fill.
// A command is not immediately executed after created. Instaed, it is queued after created,
// and executed only when necessary.
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type command interface {
fmt.Stringer
Exec(indexOffset int) error
NumVertices() int
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NumIndices() int
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AddNumVertices(n int)
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AddNumIndices(n int)
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CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool
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}
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// commandQueue is a command queue for drawing commands.
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type commandQueue struct {
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// commands is a queue of drawing commands.
commands []command
// vertices represents a vertices data in OpenGL's array buffer.
vertices []float32
// nvertices represents the current length of vertices.
// nvertices must <= len(vertices).
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// vertices is never shrunk since re-extending a vertices buffer is heavy.
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//
// TODO: This is a number of float32 values, not a number of vertices.
// Rename or fix the program.
nvertices int
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indices []uint16
nindices int
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tmpNumIndices int
nextIndex int
err error
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}
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// theCommandQueue is the command queue for the current process.
var theCommandQueue = &commandQueue{}
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// appendVertices appends vertices to the queue.
func (q *commandQueue) appendVertices(vertices []float32) {
if len(q.vertices) < q.nvertices+len(vertices) {
n := q.nvertices + len(vertices) - len(q.vertices)
q.vertices = append(q.vertices, make([]float32, n)...)
}
copy(q.vertices[q.nvertices:], vertices)
q.nvertices += len(vertices)
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}
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func (q *commandQueue) appendIndices(indices []uint16, offset uint16) {
if len(q.indices) < q.nindices+len(indices) {
n := q.nindices + len(indices) - len(q.indices)
q.indices = append(q.indices, make([]uint16, n)...)
}
for i := range indices {
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q.indices[q.nindices+i] = indices[i] + offset
}
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q.nindices += len(indices)
}
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func (q *commandQueue) doEnqueueDrawImageCommand(dst, src *Image, nvertices, nindices int, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter, forceNewCommand bool) {
if nindices > graphics.IndicesNum {
panic("not reached")
}
if !forceNewCommand && 0 < len(q.commands) {
if last := q.commands[len(q.commands)-1]; last.CanMerge(dst, src, color, mode, filter) {
last.AddNumVertices(nvertices)
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last.AddNumIndices(nindices)
return
}
}
c := &drawImageCommand{
dst: dst,
src: src,
nvertices: nvertices,
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nindices: nindices,
color: color,
mode: mode,
filter: filter,
}
q.commands = append(q.commands, c)
}
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// EnqueueDrawImageCommand enqueues a drawing-image command.
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func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, indices []uint16, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) {
if len(indices) > graphics.IndicesNum {
panic("not reached")
}
split := false
if q.tmpNumIndices+len(indices) > graphics.IndicesNum {
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q.tmpNumIndices = 0
q.nextIndex = 0
split = true
}
q.appendVertices(vertices)
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q.appendIndices(indices, uint16(q.nextIndex))
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q.nextIndex += len(vertices) / graphics.VertexFloatNum
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q.tmpNumIndices += len(indices)
q.doEnqueueDrawImageCommand(dst, src, len(vertices), len(indices), color, mode, filter, split)
}
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// Enqueue enqueues a drawing command other than a draw-image command.
//
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// For a draw-image command, use EnqueueDrawImageCommand.
func (q *commandQueue) Enqueue(command command) {
q.commands = append(q.commands, command)
}
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// Flush flushes the command queue.
func (q *commandQueue) Flush() {
if q.err != nil {
return
}
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es := q.indices
vs := q.vertices
if recordLog() {
fmt.Println("--")
}
for len(q.commands) > 0 {
nv := 0
ne := 0
nc := 0
for _, c := range q.commands {
if c.NumIndices() > graphics.IndicesNum {
panic("not reached")
}
if ne+c.NumIndices() > graphics.IndicesNum {
break
}
nv += c.NumVertices()
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ne += c.NumIndices()
nc++
}
if 0 < ne {
driver().SetVertices(vs[:nv], es[:ne])
es = es[ne:]
vs = vs[nv:]
}
indexOffset := 0
for _, c := range q.commands[:nc] {
if err := c.Exec(indexOffset); err != nil {
q.err = err
return
}
if recordLog() {
fmt.Printf("%s\n", c)
}
// TODO: indexOffset should be reset if the command type is different
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// from the previous one. This fix is needed when another drawing command is
// introduced than drawImageCommand.
indexOffset += c.NumIndices()
}
if 0 < nc {
// Call glFlush to prevent black flicking (especially on Android (#226) and iOS).
driver().Flush()
}
q.commands = q.commands[nc:]
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}
q.commands = nil
q.nvertices = 0
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q.nindices = 0
q.tmpNumIndices = 0
q.nextIndex = 0
}
// Error returns an OpenGL error for the last command.
func Error() error {
return theCommandQueue.err
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}
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// FlushCommands flushes the command queue.
func FlushCommands() {
theCommandQueue.Flush()
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}
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// drawImageCommand represents a drawing command to draw an image on another image.
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type drawImageCommand struct {
dst *Image
src *Image
nvertices int
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nindices int
color *affine.ColorM
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mode graphics.CompositeMode
filter graphics.Filter
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}
func (c *drawImageCommand) String() string {
return fmt.Sprintf("draw-image: dst: %p <- src: %p, colorm: %v, mode %d, filter: %d", c.dst, c.src, c.color, c.mode, c.filter)
}
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// Exec executes the drawImageCommand.
func (c *drawImageCommand) Exec(indexOffset int) error {
// TODO: Is it ok not to bind any framebuffer here?
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if c.nindices == 0 {
return nil
}
c.dst.image.SetAsDestination()
c.src.image.SetAsSource()
if err := driver().Draw(c.nindices, indexOffset, c.mode, c.color, c.filter); err != nil {
return err
}
return nil
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}
func (c *drawImageCommand) NumVertices() int {
return c.nvertices
}
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func (c *drawImageCommand) NumIndices() int {
return c.nindices
}
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func (c *drawImageCommand) AddNumVertices(n int) {
c.nvertices += n
}
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func (c *drawImageCommand) AddNumIndices(n int) {
c.nindices += n
}
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// CanMerge returns a boolean value indicating whether the other drawImageCommand can be merged
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// with the drawImageCommand c.
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func (c *drawImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
if c.dst != dst {
return false
}
if c.src != src {
return false
}
if !c.color.Equals(color) {
return false
}
if c.mode != mode {
return false
}
if c.filter != filter {
return false
}
return true
}
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// replacePixelsCommand represents a command to replace pixels of an image.
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type replacePixelsCommand struct {
dst *Image
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pixels []byte
x int
y int
width int
height int
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}
func (c *replacePixelsCommand) String() string {
return fmt.Sprintf("replace-pixels: dst: %p, x: %d, y: %d, width: %d, height: %d", c.dst, c.x, c.y, c.width, c.height)
}
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// Exec executes the replacePixelsCommand.
func (c *replacePixelsCommand) Exec(indexOffset int) error {
c.dst.image.ReplacePixels(c.pixels, c.x, c.y, c.width, c.height)
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return nil
}
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func (c *replacePixelsCommand) NumVertices() int {
return 0
}
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func (c *replacePixelsCommand) NumIndices() int {
return 0
}
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func (c *replacePixelsCommand) AddNumVertices(n int) {
}
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func (c *replacePixelsCommand) AddNumIndices(n int) {
}
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func (c *replacePixelsCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
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return false
}
type pixelsCommand struct {
result []byte
img *Image
}
// Exec executes a pixelsCommand.
func (c *pixelsCommand) Exec(indexOffset int) error {
p, err := c.img.image.Pixels()
if err != nil {
return err
}
c.result = p
return nil
}
func (c *pixelsCommand) String() string {
return fmt.Sprintf("pixels: img: %p", c.img)
}
func (c *pixelsCommand) NumVertices() int {
return 0
}
func (c *pixelsCommand) NumIndices() int {
return 0
}
func (c *pixelsCommand) AddNumVertices(n int) {
}
func (c *pixelsCommand) AddNumIndices(n int) {
}
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func (c *pixelsCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
return false
}
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// disposeCommand represents a command to dispose an image.
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type disposeCommand struct {
target *Image
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}
func (c *disposeCommand) String() string {
return fmt.Sprintf("dispose: target: %p", c.target)
}
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// Exec executes the disposeCommand.
func (c *disposeCommand) Exec(indexOffset int) error {
c.target.image.Dispose()
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return nil
}
func (c *disposeCommand) NumVertices() int {
return 0
}
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func (c *disposeCommand) NumIndices() int {
return 0
}
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func (c *disposeCommand) AddNumVertices(n int) {
}
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func (c *disposeCommand) AddNumIndices(n int) {
}
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func (c *disposeCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
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return false
}
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// newImageCommand represents a command to create an empty image with given width and height.
type newImageCommand struct {
result *Image
width int
height int
}
func (c *newImageCommand) String() string {
return fmt.Sprintf("new-image: result: %p, width: %d, height: %d", c.result, c.width, c.height)
}
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// Exec executes a newImageCommand.
func (c *newImageCommand) Exec(indexOffset int) error {
i, err := driver().NewImage(c.width, c.height)
if err != nil {
return err
}
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c.result.image = i
return nil
}
func (c *newImageCommand) NumVertices() int {
return 0
}
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func (c *newImageCommand) NumIndices() int {
return 0
}
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func (c *newImageCommand) AddNumVertices(n int) {
}
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func (c *newImageCommand) AddNumIndices(n int) {
}
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func (c *newImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
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return false
}
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// newScreenFramebufferImageCommand is a command to create a special image for the screen.
type newScreenFramebufferImageCommand struct {
result *Image
width int
height int
}
func (c *newScreenFramebufferImageCommand) String() string {
return fmt.Sprintf("new-screen-framebuffer-image: result: %p, width: %d, height: %d", c.result, c.width, c.height)
}
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// Exec executes a newScreenFramebufferImageCommand.
func (c *newScreenFramebufferImageCommand) Exec(indexOffset int) error {
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var err error
c.result.image, err = driver().NewScreenFramebufferImage(c.width, c.height)
return err
}
func (c *newScreenFramebufferImageCommand) NumVertices() int {
return 0
}
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func (c *newScreenFramebufferImageCommand) NumIndices() int {
return 0
}
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func (c *newScreenFramebufferImageCommand) AddNumVertices(n int) {
}
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func (c *newScreenFramebufferImageCommand) AddNumIndices(n int) {
}
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func (c *newScreenFramebufferImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode graphics.CompositeMode, filter graphics.Filter) bool {
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return false
}
// ResetGraphicsDriverState resets or initializes the current graphics driver state.
func ResetGraphicsDriverState() error {
return driver().Reset()
}