func (p *Painter) Flush() {
if len(p.vertices) != 0 {
gl.EnableClientState(gl.COLOR_ARRAY)
gl.EnableClientState(gl.VERTEX_ARRAY)
gl.ColorPointer(4, gl.UNSIGNED_BYTE, 0, gl.Ptr(p.colors))
gl.VertexPointer(2, gl.INT, 0, gl.Ptr(p.vertices))
// draw lines
gl.DrawArrays(gl.LINES, 0, int32(len(p.vertices)/2))
gl.DisableClientState(gl.VERTEX_ARRAY)
gl.DisableClientState(gl.COLOR_ARRAY)
p.vertices = p.vertices[0:0]
p.colors = p.colors[0:0]
}
}
func List(width, height int, list *draw.List) {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.SCISSOR_TEST)
defer gl.Disable(gl.SCISSOR_TEST)
gl.EnableClientState(gl.VERTEX_ARRAY)
defer gl.DisableClientState(gl.VERTEX_ARRAY)
gl.EnableClientState(gl.COLOR_ARRAY)
defer gl.DisableClientState(gl.COLOR_ARRAY)
gl.EnableClientState(gl.TEXTURE_COORD_ARRAY)
defer gl.DisableClientState(gl.TEXTURE_COORD_ARRAY)
gl.VertexPointer(2, gl.FLOAT, vertexStride, unsafe.Pointer(&(list.Vertices[0].P)))
gl.TexCoordPointer(2, gl.FLOAT, vertexStride, unsafe.Pointer(&(list.Vertices[0].UV)))
gl.ColorPointer(4, gl.UNSIGNED_BYTE, vertexStride, unsafe.Pointer(&(list.Vertices[0].Color)))
offset := 0
for _, cmd := range list.Commands {
if cmd.Count == 0 {
continue
}
if cmd.Texture == 0 {
gl.Disable(gl.TEXTURE_2D)
} else {
gl.Enable(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, uint32(cmd.Texture))
}
x, y, w, h := cmd.Clip.AsInt32()
gl.Scissor(x, int32(height)-y-h, w, h)
gl.DrawElements(gl.TRIANGLES, int32(cmd.Count), indexType, gl.Ptr(list.Indicies[offset:]))
offset += int(cmd.Count)
}
}