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internal/graphicscommand: refactoring

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This commit is contained in:
Hajime Hoshi 2022-09-14 23:13:08 +09:00
parent 2610c148e4
commit 95bfa95a91
1 changed files with 7 additions and 30 deletions
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37
internal/graphicscommand/command.go
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@ -65,17 +65,7 @@ type commandQueue struct {
// vertices represents a vertices data in OpenGL's array buffer.
vertices []float32
// nvertices represents the current length of vertices.
// nvertices must <= len(vertices).
// vertices is never shrunk since re-extending a vertices buffer is heavy.
//
// TODO: This is a number of float32 values, not a number of vertices.
// Rename or fix the program.
nvertices int
indices []uint16
nindices int
tmpNumVertexFloats int
tmpNumIndices int
@ -86,25 +76,12 @@ type commandQueue struct {
// theCommandQueue is the command queue for the current process.
var theCommandQueue = &commandQueue{}
// appendVertices appends vertices to the queue.
func (q *commandQueue) appendVertices(vertices []float32, src *Image) {
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)
}
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)...)
}
n := len(q.indices)
q.indices = append(q.indices, indices...)
for i := range indices {
q.indices[q.nindices+i] = indices[i] + offset
q.indices[n+i] += offset
}
q.nindices += len(indices)
}
// mustUseDifferentVertexBuffer reports whether a different vertex buffer must be used.
@ -127,7 +104,7 @@ func (q *commandQueue) EnqueueDrawTrianglesCommand(dst *Image, srcs [graphics.Sh
// Assume that all the image sizes are same.
// Assume that the images are packed from the front in the slice srcs.
q.appendVertices(vertices, srcs[0])
q.vertices = append(q.vertices, vertices...)
q.appendIndices(indices, uint16(q.tmpNumVertexFloats/graphics.VertexFloatCount))
q.tmpNumVertexFloats += len(vertices)
q.tmpNumIndices += len(indices)
@ -174,7 +151,7 @@ func (q *commandQueue) EnqueueDrawTrianglesCommand(dst *Image, srcs [graphics.Sh
}
func (q *commandQueue) lastVertices(n int) []float32 {
return q.vertices[q.nvertices-n : q.nvertices]
return q.vertices[len(q.vertices)-n : len(q.vertices)]
}
// Enqueue enqueues a drawing command other than a draw-triangles command.
@ -264,8 +241,8 @@ func (q *commandQueue) flush(graphicsDriver graphicsdriver.Graphics) error {
q.commands[i] = nil
}
q.commands = q.commands[:0]
q.nvertices = 0
q.nindices = 0
q.vertices = q.vertices[:0]
q.indices = q.indices[:0]
q.tmpNumVertexFloats = 0
q.tmpNumIndices = 0
return nil