func (polyline *polyLine) drawTriangles(is_looping bool) {
var overdraw []mgl32.Vec2
if polyline.overdraw {
overdraw = polyline.renderOverdraw(is_looping)
}
numindices := int(math.Max(float64(len(polyline.vertices)/4), float64(len(overdraw)/4)))
indices := newAltQuadIndices(numindices)
prepareDraw(nil)
bindTexture(gl_state.defaultTexture)
useVertexAttribArrays(attribflag_pos)
gl.VertexAttribPointer(attrib_pos, 2, gl.FLOAT, false, 0, gl.Ptr(polyline.vertices))
gl.DrawElements(gl.TRIANGLES, (len(polyline.vertices)/4)*6, gl.UNSIGNED_SHORT, gl.Ptr(indices))
if polyline.overdraw {
c := GetColor()
colors := polyline.generateColorArray(len(overdraw), c)
useVertexAttribArrays(attribflag_pos | attribflag_color)
gl.VertexAttribPointer(attrib_color, 4, gl.UNSIGNED_BYTE, true, 0, gl.Ptr(colors))
gl.VertexAttribPointer(attrib_pos, 2, gl.FLOAT, false, 0, gl.Ptr(overdraw))
gl.DrawElements(gl.TRIANGLES, (len(overdraw)/4)*6, gl.UNSIGNED_SHORT, gl.Ptr(indices))
SetColorC(c)
}
indices.Release()
}
func (buffer *indexBuffer) drawElementsLocal(mode uint32, offset, size int) {
gl.DrawElements(gl.Enum(mode), size, gl.UNSIGNED_INT, gl.Ptr(&buffer.data[offset]))
}
func (buffer *indexBuffer) drawElements(mode uint32, offset, size int) {
buffer.bind()
defer buffer.unbind()
gl.DrawElements(gl.Enum(mode), size, gl.UNSIGNED_INT, gl.PtrOffset(offset*4))
}