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graphics: Add comments

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This commit is contained in:
Hajime Hoshi 2017-09-19 01:37:24 +09:00
parent ce5a81ffcd
commit 0831fd2a0d
1 changed files with 13 additions and 3 deletions
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16
internal/graphics/command.go
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@ -39,15 +39,24 @@ type command interface {
// commandQueue is a command queue for drawing commands.
type commandQueue struct {
commands []command
vertices []float32
// commands is a queue of drawing commands.
commands []command
// vertices represents a vertices data in OpenGL's array buffer.
vertices []float32
// verticesNum represents the current length of vertices.
// verticesNum must <= len(vertices).
// vertices is never shrunk since re-extending a vertices buffer is heavy.
verticesNum int
m sync.Mutex
m sync.Mutex
}
// theCommandQueue is the command queue for the current process.
var theCommandQueue = &commandQueue{}
// appendVertices appends vertices to the queue.
func (q *commandQueue) appendVertices(vertices []float32) {
if len(q.vertices) < q.verticesNum+len(vertices) {
n := q.verticesNum + len(vertices) - len(q.vertices)
@ -61,6 +70,7 @@ func (q *commandQueue) appendVertices(vertices []float32) {
q.verticesNum += len(vertices)
}
// EnqueueDrawImageCommand enqueues a drawing-image command.
func (q *commandQueue) EnqueueDrawImageCommand(dst, src *Image, vertices []float32, clr *affine.ColorM, mode opengl.CompositeMode) {
// Avoid defer for performance
q.m.Lock()