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graphics: Cache total bytes

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This commit is contained in:
Hajime Hoshi 2016-10-29 01:07:19 +09:00
parent 2b2d6157c7
commit 6de9e6696e
2 changed files with 10 additions and 5 deletions
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2
internal/graphics/command.go
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@ -199,7 +199,7 @@ type drawImageCommand struct {
}
func QuadVertexSizeInBytes() int {
return 4 * theArrayBufferLayout.total()
return 4 * theArrayBufferLayout.totalBytes()
}
func (c *drawImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {

13
internal/graphics/program.go
View File

@ -30,25 +30,30 @@ type arrayBufferLayoutPart struct {
type arrayBufferLayout struct {
parts []arrayBufferLayoutPart
total int
}
func (a *arrayBufferLayout) total() int {
func (a *arrayBufferLayout) totalBytes() int {
if a.total != 0 {
return a.total
}
t := 0
for _, p := range a.parts {
t += p.dataType.SizeInBytes() * p.num
}
return t
a.total = t
return a.total
}
func (a *arrayBufferLayout) newArrayBuffer(c *opengl.Context) opengl.Buffer {
return c.NewBuffer(opengl.ArrayBuffer, a.total()*4*maxQuads, opengl.DynamicDraw)
return c.NewBuffer(opengl.ArrayBuffer, a.totalBytes()*4*maxQuads, opengl.DynamicDraw)
}
func (a *arrayBufferLayout) enable(c *opengl.Context, program opengl.Program) {
for _, p := range a.parts {
c.EnableVertexAttribArray(program, p.name)
}
total := a.total()
total := a.totalBytes()
offset := 0
for _, p := range a.parts {
c.VertexAttribPointer(program, p.name, p.num, p.dataType, p.normalize, total, offset)