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go-opengl-pixel
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take advantage of reentrant Do in graphics primitives

This commit is contained in:
faiface 2016-12-04 23:57:15 +01:00
parent 6564597c43
commit 3bc5f0a127
1 changed files with 33 additions and 42 deletions
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75
graphics.go
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@ -105,23 +105,20 @@ func NewLineColor(parent pixelgl.Doer, c color.Color, a, b Vec, width float64) *
width: width,
}
var format pixelgl.VertexFormat
parent.Do(func(ctx pixelgl.Context) {
format = ctx.Shader().VertexFormat()
var err error
lc.va, err = pixelgl.NewVertexArray(
parent,
ctx.Shader().VertexFormat(),
pixelgl.TriangleStripDrawMode,
pixelgl.DynamicUsage,
4,
)
if err != nil {
panic(errors.Wrap(err, "failed to create line"))
}
})
var err error
lc.va, err = pixelgl.NewVertexArray(
parent,
format,
pixelgl.TriangleStripDrawMode,
pixelgl.DynamicUsage,
4,
)
if err != nil {
panic(errors.Wrap(err, "failed to create line"))
}
lc.va.SetVertexAttributeVec4(0, pixelgl.Color, mgl32.Vec4{1, 1, 1, 1})
lc.va.SetVertexAttributeVec4(1, pixelgl.Color, mgl32.Vec4{1, 1, 1, 1})
lc.va.SetVertexAttributeVec4(2, pixelgl.Color, mgl32.Vec4{1, 1, 1, 1})
@ -222,23 +219,20 @@ func NewPolygonColor(parent pixelgl.Doer, c color.Color, points ...Vec) *Polygon
points: points,
}
var format pixelgl.VertexFormat
parent.Do(func(ctx pixelgl.Context) {
format = ctx.Shader().VertexFormat()
var err error
pc.va, err = pixelgl.NewVertexArray(
parent,
ctx.Shader().VertexFormat(),
pixelgl.TriangleFanDrawMode,
pixelgl.DynamicUsage,
len(points),
)
if err != nil {
panic(errors.Wrap(err, "failed to create polygon"))
}
})
var err error
pc.va, err = pixelgl.NewVertexArray(
parent,
format,
pixelgl.TriangleFanDrawMode,
pixelgl.DynamicUsage,
len(points),
)
if err != nil {
panic(errors.Wrap(err, "failed to create polygon"))
}
for i, p := range points {
pc.va.SetVertexAttributeVec2(
i,
@ -333,23 +327,20 @@ func NewEllipseColor(parent pixelgl.Doer, c color.Color, radius Vec, fill float6
fill: fill,
}
var format pixelgl.VertexFormat
parent.Do(func(ctx pixelgl.Context) {
format = ctx.Shader().VertexFormat()
var err error
ec.va, err = pixelgl.NewVertexArray(
parent,
ctx.Shader().VertexFormat(),
pixelgl.TriangleStripDrawMode,
pixelgl.DynamicUsage,
(n+1)*2,
)
if err != nil {
panic(errors.Wrap(err, "failed to create circle"))
}
})
var err error
ec.va, err = pixelgl.NewVertexArray(
parent,
format,
pixelgl.TriangleStripDrawMode,
pixelgl.DynamicUsage,
(n+1)*2,
)
if err != nil {
panic(errors.Wrap(err, "failed to create circle"))
}
for k := 0; k < n+1; k++ {
i, j := k*2, k*2+1
angle := math.Pi * 2 * float64(k%n) / n