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graphics: Reduce magic numbers

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This commit is contained in:
Hajime Hoshi 2016-10-17 11:16:17 +09:00
parent cbcbdb0b97
commit 3efabe988a
1 changed files with 9 additions and 5 deletions
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14
internal/graphics/command.go
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@ -108,7 +108,7 @@ func (q *commandQueue) Flush(context *opengl.Context) error {
}
// 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 < len(vertices)/16 {
if maxQuads < len(vertices)/quadVertexNum {
return errors.New(fmt.Sprintf("len(quads) must be equal to or less than %d", maxQuads))
}
numc := len(g)
@ -118,7 +118,7 @@ func (q *commandQueue) Flush(context *opengl.Context) error {
return err
}
if c, ok := c.(*drawImageCommand); ok {
indexOffsetInBytes += 6 * len(c.vertices) / 16 * 2
indexOffsetInBytes += 6 * len(c.vertices) / quadVertexNum * 2
}
}
if 0 < numc {
@ -161,6 +161,10 @@ type drawImageCommand struct {
mode opengl.CompositeMode
}
const (
quadVertexNum = 16 // 4 * 2 [vertices] * 2 [tex_coords]
)
func (c *drawImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int) error {
if err := c.dst.framebuffer.setAsViewport(context); err != nil {
return err
@ -195,13 +199,13 @@ func (c *drawImageCommand) Exec(context *opengl.Context, indexOffsetInBytes int)
func (c *drawImageCommand) split(quadsNum int) [2]*drawImageCommand {
c1 := *c
c2 := *c
c1.vertices = c.vertices[:quadsNum*16]
c2.vertices = c.vertices[quadsNum*16:]
c1.vertices = c.vertices[:quadsNum*quadVertexNum]
c2.vertices = c.vertices[quadsNum*quadVertexNum:]
return [2]*drawImageCommand{&c1, &c2}
}
func (c *drawImageCommand) quadsNum() int {
return len(c.vertices) / 16
return len(c.vertices) / quadVertexNum
}
type replacePixelsCommand struct {