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Use VBO for vertices, tex coords (#2)

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This commit is contained in:
Hajime Hoshi 2014-12-26 01:11:42 +09:00
parent 7f6e440d97
commit c156cb1e66
1 changed files with 28 additions and 17 deletions
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41
internal/opengl/internal/shader/drawtexture.go
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@ -16,6 +16,7 @@ package shader
import (
"github.com/go-gl/gl"
"unsafe"
)
func glMatrix(m [4][4]float64) [16]float32 {
@ -34,19 +35,26 @@ type Matrix interface {
type vbo struct {
indexBuffer gl.Buffer
vertexBuffer gl.Buffer
}
const size = 10000
var currentVBO *vbo
const uint16Size = 2
const short32Size = 4
func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []TextureQuad, geo Matrix, color Matrix) {
// TODO: Check len(quads) and gl.MAX_ELEMENTS_INDICES?
const stride = 4 * 4
if currentVBO == nil {
initialize()
currentVBO = &vbo{
indexBuffer: gl.GenBuffer(),
vertexBuffer: gl.GenBuffer(),
}
currentVBO.indexBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER)
indices := make([]uint16, 6*size)
for i := uint16(0); i < size; i++ {
@ -57,7 +65,11 @@ func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []Text
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)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, uint16Size*len(indices), indices, gl.STATIC_DRAW)
currentVBO.vertexBuffer.Bind(gl.ARRAY_BUFFER)
vertices := make([]float32, stride*size)
gl.BufferData(gl.ARRAY_BUFFER, short32Size*len(vertices), vertices, gl.DYNAMIC_DRAW)
}
if len(quads) == 0 {
@ -83,32 +95,31 @@ func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []Text
gl.DisableClientState(gl.VERTEX_ARRAY)
}()
// TODO: Fix this dirty hack after fixing https://github.com/go-gl/gl/issues/174
v := (*int)(unsafe.Pointer(uintptr(4 * 0)))
t := (*int)(unsafe.Pointer(uintptr(4 * 2)))
vertexAttrLocation.AttribPointer(2, gl.FLOAT, false, stride, v)
texCoordAttrLocation.AttribPointer(2, gl.FLOAT, false, stride, t)
vertices := []float32{}
texCoords := []float32{}
for _, quad := range quads {
x0 := quad.VertexX0
x1 := quad.VertexX1
y0 := quad.VertexY0
y1 := quad.VertexY1
vertices = append(vertices,
x0, y0,
x1, y0,
x0, y1,
x1, y1,
)
u0 := quad.TextureCoordU0
u1 := quad.TextureCoordU1
v0 := quad.TextureCoordV0
v1 := quad.TextureCoordV1
texCoords = append(texCoords,
u0, v0,
u1, v0,
u0, v1,
u1, v1,
vertices = append(vertices,
x0, y0, u0, v0,
x1, y0, u1, v0,
x0, y1, u0, v1,
x1, y1, u1, v1,
)
}
vertexAttrLocation.AttribPointer(2, gl.FLOAT, false, 0, vertices)
texCoordAttrLocation.AttribPointer(2, gl.FLOAT, false, 0, texCoords)
gl.BufferSubData(gl.ARRAY_BUFFER, 0, short32Size*len(vertices), vertices)
// TODO: Pass 0 after fixing the gl bug
gl.DrawElements(gl.TRIANGLES, 6*len(quads), gl.UNSIGNED_SHORT, nil)
gl.Flush()