func setupGL() int32 {
gl.Disable(gl.DEPTH_TEST)
gl.ClearColor(0.7, 0.7, 0.7, 1)
program, _ := loadResources()
gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))
cameraMatrixUniform := gl.GetUniformLocation(program, gl.Str("cameraMatrix\x00"))
octUniform := gl.GetUniformLocation(program, gl.Str("oct\x00"))
gl.Uniform1i(octUniform, 0)
gl.Viewport(0, 0, winWidth, winHeight)
var vao uint32
gl.GenVertexArrays(1, &vao)
gl.BindVertexArray(vao)
quadVertexBufferData := []float32{
-1, -1, 0,
1, -1, 0,
-1, 1, 0,
-1, 1, 0,
1, -1, 0,
1, 1, 0,
}
var vbo uint32
gl.GenBuffers(1, &vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
gl.BufferData(gl.ARRAY_BUFFER, len(quadVertexBufferData)*4, gl.Ptr(quadVertexBufferData), gl.STATIC_DRAW)
vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("inputPosition\x00")))
gl.EnableVertexAttribArray(vertAttrib)
gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 0, gl.PtrOffset(0))
return cameraMatrixUniform
}
// VertexAttribOffset implements the opengl.OpenGl interface.
func (native *OpenGl) VertexAttribOffset(index uint32, size int32, attribType uint32, normalized bool, stride int32, offset int) {
gl.VertexAttribPointer(index, size, attribType, normalized, stride, gl.PtrOffset(offset))
}