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graphics: Avoid using append

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This commit is contained in:
Hajime Hoshi 2016-02-16 01:49:27 +09:00
parent a7803efa9b
commit 537cfea8a4
1 changed files with 19 additions and 15 deletions
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34
internal/graphics/draw.go
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@ -33,7 +33,7 @@ type Matrix interface {
Element(i, j int) float64
}
var vertices = make([]int16, 0, 4*8*quadsMaxNum)
var vertices = make([]int16, 16*quadsMaxNum)
var shadersInitialized = false
@ -66,26 +66,30 @@ func drawTexture(c *opengl.Context, texture opengl.Texture, projectionMatrix *[4
p.begin()
defer p.end()
vertices := vertices[0:0]
num := 0
for i := 0; i < quads.Len(); i++ {
x0, y0, x1, y1 := quads.Vertex(i)
u0, v0, u1, v1 := quads.Texture(i)
if x0 == x1 || y0 == y1 || u0 == u1 || v0 == v1 {
continue
}
vertices = append(vertices,
int16(x0), int16(y0), int16(u0), int16(v0),
int16(x1), int16(y0), int16(u1), int16(v0),
int16(x0), int16(y1), int16(u0), int16(v1),
int16(x1), int16(y1), int16(u1), int16(v1),
)
num++
vertices[16*i] = int16(x0)
vertices[16*i+1] = int16(y0)
vertices[16*i+2] = int16(u0)
vertices[16*i+3] = int16(v0)
vertices[16*i+4] = int16(x1)
vertices[16*i+5] = int16(y0)
vertices[16*i+6] = int16(u1)
vertices[16*i+7] = int16(v0)
vertices[16*i+8] = int16(x0)
vertices[16*i+9] = int16(y1)
vertices[16*i+10] = int16(u0)
vertices[16*i+11] = int16(v1)
vertices[16*i+12] = int16(x1)
vertices[16*i+13] = int16(y1)
vertices[16*i+14] = int16(u1)
vertices[16*i+15] = int16(v1)
}
if len(vertices) == 0 {
return nil
}
c.BufferSubData(c.ArrayBuffer, vertices)
c.DrawElements(c.Triangles, 6*num)
c.BufferSubData(c.ArrayBuffer, vertices[:16*quads.Len()])
c.DrawElements(c.Triangles, 6*quads.Len())
return nil
}