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graphics: Remove type assertion

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This commit is contained in:
Hajime Hoshi 2018-03-18 19:58:32 +09:00
parent 23c2fc0134
commit 9009b293e5
1 changed files with 44 additions and 11 deletions
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55
internal/graphics/command.go
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@ -32,6 +32,8 @@ import (
type command interface {
Exec(indexOffsetInBytes int) error
NumVertices() int
AddNumVertices(n int)
CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool
}
// commandQueue is a command queue for drawing commands.
@ -68,24 +70,23 @@ func (q *commandQueue) appendVertices(vertices []float32) {
}
// EnqueueDrawImageCommand enqueues a drawing-image command.
func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, clr *affine.ColorM, mode opengl.CompositeMode, filter Filter) {
func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) {
// Avoid defer for performance
q.m.Lock()
q.appendVertices(vertices)
if 0 < len(q.commands) {
if c, ok := q.commands[len(q.commands)-1].(*drawImageCommand); ok {
if c.canMerge(dst, src, clr, mode, filter) {
c.nvertices += len(vertices)
q.m.Unlock()
return
}
last := q.commands[len(q.commands)-1]
if last.CanMerge(dst, src, color, mode, filter) {
last.AddNumVertices(len(vertices))
q.m.Unlock()
return
}
}
c := &drawImageCommand{
dst: dst,
src: src,
nvertices: len(vertices),
color: clr,
color: color,
mode: mode,
filter: filter,
}
@ -227,6 +228,10 @@ func (c *drawImageCommand) NumVertices() int {
return c.nvertices
}
func (c *drawImageCommand) AddNumVertices(n int) {
c.nvertices += n
}
// split splits the drawImageCommand c into two drawImageCommands.
//
// split is called when the number of vertices reaches of the maximum and
@ -241,16 +246,16 @@ func (c *drawImageCommand) split(quadsNum int) [2]*drawImageCommand {
return [2]*drawImageCommand{&c1, &c2}
}
// canMerge returns a boolean value indicating whether the other drawImageCommand can be merged
// CanMerge returns a boolean value indicating whether the other drawImageCommand can be merged
// with the drawImageCommand c.
func (c *drawImageCommand) canMerge(dst, src *Image, clr *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool {
func (c *drawImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool {
if c.dst != dst {
return false
}
if c.src != src {
return false
}
if !c.color.Equals(clr) {
if !c.color.Equals(color) {
return false
}
if c.mode != mode {
@ -297,6 +302,13 @@ func (c *replacePixelsCommand) NumVertices() int {
return 0
}
func (c *replacePixelsCommand) AddNumVertices(n int) {
}
func (c *replacePixelsCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool {
return false
}
// disposeCommand represents a command to dispose an image.
type disposeCommand struct {
target *Image
@ -318,6 +330,13 @@ func (c *disposeCommand) NumVertices() int {
return 0
}
func (c *disposeCommand) AddNumVertices(n int) {
}
func (c *disposeCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool {
return false
}
// newImageCommand represents a command to create an empty image with given width and height.
type newImageCommand struct {
result *Image
@ -360,6 +379,13 @@ func (c *newImageCommand) NumVertices() int {
return 0
}
func (c *newImageCommand) AddNumVertices(n int) {
}
func (c *newImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool {
return false
}
// newScreenFramebufferImageCommand is a command to create a special image for the screen.
type newScreenFramebufferImageCommand struct {
result *Image
@ -380,3 +406,10 @@ func (c *newScreenFramebufferImageCommand) Exec(indexOffsetInBytes int) error {
func (c *newScreenFramebufferImageCommand) NumVertices() int {
return 0
}
func (c *newScreenFramebufferImageCommand) AddNumVertices(n int) {
}
func (c *newScreenFramebufferImageCommand) CanMerge(dst, src *Image, color *affine.ColorM, mode opengl.CompositeMode, filter Filter) bool {
return false
}