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Use VBO for indices (#2)

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This commit is contained in:
Hajime Hoshi 2014-12-25 23:16:18 +09:00
parent 5780e9020c
commit 7f6e440d97
1 changed files with 27 additions and 15 deletions
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42
internal/opengl/internal/shader/drawtexture.go
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@ -16,7 +16,6 @@ package shader
import (
"github.com/go-gl/gl"
"sync"
)
func glMatrix(m [4][4]float64) [16]float32 {
@ -29,17 +28,37 @@ func glMatrix(m [4][4]float64) [16]float32 {
return result
}
var once sync.Once
type Matrix interface {
Element(i, j int) float64
}
// TODO: Use VBO
type vbo struct {
indexBuffer gl.Buffer
}
const size = 10000
var currentVBO *vbo
func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []TextureQuad, geo Matrix, color Matrix) {
once.Do(func() {
// TODO: Check len(quads) and gl.MAX_ELEMENTS_INDICES?
if currentVBO == nil {
initialize()
})
currentVBO = &vbo{
indexBuffer: gl.GenBuffer(),
}
currentVBO.indexBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER)
indices := make([]uint16, 6*size)
for i := uint16(0); i < size; i++ {
indices[6*i+0] = 4*i + 0
indices[6*i+1] = 4*i + 1
indices[6*i+2] = 4*i + 2
indices[6*i+3] = 4*i + 1
indices[6*i+4] = 4*i + 2
indices[6*i+5] = 4*i + 3
}
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(indices), indices, gl.STATIC_DRAW)
}
if len(quads) == 0 {
return
@ -66,9 +85,7 @@ func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []Text
vertices := []float32{}
texCoords := []float32{}
indicies := []uint32{}
// TODO: Check len(quads) and gl.MAX_ELEMENTS_INDICES?
for i, quad := range quads {
for _, quad := range quads {
x0 := quad.VertexX0
x1 := quad.VertexX1
y0 := quad.VertexY0
@ -89,15 +106,10 @@ func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []Text
u0, v1,
u1, v1,
)
base := uint32(i * 4)
indicies = append(indicies,
base, base+1, base+2,
base+1, base+2, base+3,
)
}
vertexAttrLocation.AttribPointer(2, gl.FLOAT, false, 0, vertices)
texCoordAttrLocation.AttribPointer(2, gl.FLOAT, false, 0, texCoords)
gl.DrawElements(gl.TRIANGLES, len(indicies), gl.UNSIGNED_INT, indicies)
gl.DrawElements(gl.TRIANGLES, 6*len(quads), gl.UNSIGNED_SHORT, nil)
gl.Flush()
}