func draw() {
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexArrayBuffer)
gl.VertexAttribPointer(attrPos, 4, gl.FLOAT, false, 0, nil)
gl.BindBuffer(gl.ARRAY_BUFFER, colorArrayBuffer)
gl.VertexAttribPointer(attrCol, 3, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
gl.Flush()
gl.Finish()
egl.SwapBuffers(display, surface)
}
func initShaders() {
p = Program(FragmentShader(fsh), VertexShader(vsh))
gl.UseProgram(p)
attrPos = uint32(gl.GetAttribLocation(p, "pos"))
attrCol = uint32(gl.GetAttribLocation(p, "color"))
gl.GenBuffers(1, &vertexArrayBuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexArrayBuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.SizeiPtr(len(vertices))*4, unsafe.Pointer(&vertices[0]), gl.STATIC_DRAW)
gl.GenBuffers(1, &colorArrayBuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, colorArrayBuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.SizeiPtr(len(colors))*4, unsafe.Pointer(&colors[0]), gl.STATIC_DRAW)
gl.EnableVertexAttribArray(attrPos)
gl.EnableVertexAttribArray(attrCol)
}