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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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45
internal/opengl/internal/shader/drawtexture.go
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@ -16,6 +16,7 @@ package shader
import ( import (
"github.com/go-gl/gl" "github.com/go-gl/gl"
"unsafe"
) )
func glMatrix(m [4][4]float64) [16]float32 { func glMatrix(m [4][4]float64) [16]float32 {
@ -33,20 +34,27 @@ type Matrix interface {
} }
type vbo struct { type vbo struct {
indexBuffer gl.Buffer indexBuffer gl.Buffer
vertexBuffer gl.Buffer
} }
const size = 10000 const size = 10000
var currentVBO *vbo var currentVBO *vbo
const uint16Size = 2
const short32Size = 4
func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []TextureQuad, geo Matrix, color Matrix) { func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []TextureQuad, geo Matrix, color Matrix) {
// TODO: Check len(quads) and gl.MAX_ELEMENTS_INDICES? // TODO: Check len(quads) and gl.MAX_ELEMENTS_INDICES?
const stride = 4 * 4
if currentVBO == nil { if currentVBO == nil {
initialize() initialize()
currentVBO = &vbo{ currentVBO = &vbo{
indexBuffer: gl.GenBuffer(), indexBuffer: gl.GenBuffer(),
vertexBuffer: gl.GenBuffer(),
} }
currentVBO.indexBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER) currentVBO.indexBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER)
indices := make([]uint16, 6*size) indices := make([]uint16, 6*size)
for i := uint16(0); i < size; i++ { 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+4] = 4*i + 2
indices[6*i+5] = 4*i + 3 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 { if len(quads) == 0 {
@ -83,32 +95,31 @@ func DrawTexture(native gl.Texture, projectionMatrix [4][4]float64, quads []Text
gl.DisableClientState(gl.VERTEX_ARRAY) 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{} vertices := []float32{}
texCoords := []float32{}
for _, quad := range quads { for _, quad := range quads {
x0 := quad.VertexX0 x0 := quad.VertexX0
x1 := quad.VertexX1 x1 := quad.VertexX1
y0 := quad.VertexY0 y0 := quad.VertexY0
y1 := quad.VertexY1 y1 := quad.VertexY1
vertices = append(vertices,
x0, y0,
x1, y0,
x0, y1,
x1, y1,
)
u0 := quad.TextureCoordU0 u0 := quad.TextureCoordU0
u1 := quad.TextureCoordU1 u1 := quad.TextureCoordU1
v0 := quad.TextureCoordV0 v0 := quad.TextureCoordV0
v1 := quad.TextureCoordV1 v1 := quad.TextureCoordV1
texCoords = append(texCoords, vertices = append(vertices,
u0, v0, x0, y0, u0, v0,
u1, v0, x1, y0, u1, v0,
u0, v1, x0, y1, u0, v1,
u1, v1, x1, y1, u1, v1,
) )
} }
vertexAttrLocation.AttribPointer(2, gl.FLOAT, false, 0, vertices) gl.BufferSubData(gl.ARRAY_BUFFER, 0, short32Size*len(vertices), vertices)
texCoordAttrLocation.AttribPointer(2, gl.FLOAT, false, 0, texCoords) // TODO: Pass 0 after fixing the gl bug
gl.DrawElements(gl.TRIANGLES, 6*len(quads), gl.UNSIGNED_SHORT, nil) gl.DrawElements(gl.TRIANGLES, 6*len(quads), gl.UNSIGNED_SHORT, nil)
gl.Flush() gl.Flush()