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internal/graphicsdriver/opengl: automatically adjust the array buffer layout

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Updates #2640
This commit is contained in:
Hajime Hoshi 2024-08-12 03:56:47 +09:00
parent 9e208eee81
commit 435c8b75eb
1 changed files with 36 additions and 25 deletions
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61
internal/graphicsdriver/opengl/program.go
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@ -53,14 +53,14 @@ func (a *arrayBufferLayout) names() []string {
return ns
}
// totalBytes returns the size in bytes for one element of the array buffer.
func (a *arrayBufferLayout) totalBytes() int {
// float32Count returns the total float32 count for one element of the array buffer.
func (a *arrayBufferLayout) float32Count() int {
if a.total != 0 {
return a.total
}
t := 0
for _, p := range a.parts {
t += floatSizeInBytes * p.num
t += p.num
}
a.total = t
return a.total
@ -71,10 +71,10 @@ func (a *arrayBufferLayout) enable(context *context) {
for i := range a.parts {
context.ctx.EnableVertexAttribArray(uint32(i))
}
total := a.totalBytes()
total := a.float32Count()
offset := 0
for i, p := range a.parts {
context.ctx.VertexAttribPointer(uint32(i), int32(p.num), gl.FLOAT, false, int32(total), offset)
context.ctx.VertexAttribPointer(uint32(i), int32(p.num), gl.FLOAT, false, int32(floatSizeInBytes*total), offset)
offset += floatSizeInBytes * p.num
}
}
@ -88,28 +88,39 @@ func (a *arrayBufferLayout) disable(context *context) {
}
// theArrayBufferLayout is the array buffer layout for Ebitengine.
var theArrayBufferLayout = arrayBufferLayout{
// Note that GL_MAX_VERTEX_ATTRIBS is at least 16.
parts: []arrayBufferLayoutPart{
{
name: "A0",
num: 2,
},
{
name: "A1",
num: 2,
},
{
name: "A2",
num: 4,
},
},
}
var theArrayBufferLayout arrayBufferLayout
func init() {
vertexFloatCount := theArrayBufferLayout.totalBytes() / floatSizeInBytes
if graphics.VertexFloatCount != vertexFloatCount {
panic(fmt.Sprintf("vertex float num must be %d but %d", graphics.VertexFloatCount, vertexFloatCount))
theArrayBufferLayout = arrayBufferLayout{
// Note that GL_MAX_VERTEX_ATTRIBS is at least 16.
parts: []arrayBufferLayoutPart{
{
name: "A0",
num: 2,
},
{
name: "A1",
num: 2,
},
{
name: "A2",
num: 4,
},
},
}
n := theArrayBufferLayout.float32Count()
if n > graphics.VertexFloatCount {
panic("opengl: the array buffer layout is too large")
}
if n < graphics.VertexFloatCount {
d := graphics.VertexFloatCount - n
if d > 4 {
panic("opengl: the array buffer layout is too small")
}
theArrayBufferLayout.parts = append(theArrayBufferLayout.parts, arrayBufferLayoutPart{
name: "A3",
num: d,
})
}
}