// bindUniform links data to uniforms expected by shaders.
// It expects the variable parameter list types to match the uniform type.
func (gc *opengl) bindUniform(uniform int32, utype, cnt int, udata ...interface{}) {
switch utype {
case i1:
i1 := udata[0].(int32)
gl.Uniform1i(uniform, i1)
case f1:
f1 := udata[0].(float32)
gl.Uniform1f(uniform, f1)
case f2:
f1 := udata[0].(float32)
f2 := udata[1].(float32)
gl.Uniform2f(uniform, f1, f2)
case f3:
f1 := udata[0].(float32)
f2 := udata[1].(float32)
f3 := udata[2].(float32)
gl.Uniform3f(uniform, f1, f2, f3)
case f4:
f1 := udata[0].(float32)
f2 := udata[1].(float32)
f3 := udata[2].(float32)
f4 := udata[3].(float32)
gl.Uniform4f(uniform, f1, f2, f3, f4)
case x3:
mptr := udata[0].(*float32)
gl.UniformMatrix3fv(uniform, int32(cnt), false, mptr)
case x34:
mptr := udata[0].(*float32)
gl.UniformMatrix3x4fv(uniform, int32(cnt), false, mptr)
case x4:
mptr := udata[0].(*float32)
gl.UniformMatrix4fv(uniform, int32(cnt), false, mptr)
}
}
// drawScene renders the single texture on the quad.
func (rt *rtrace) drawScene() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(rt.shaders)
gl.Uniform1i(rt.tex2D, 0)
gl.ActiveTexture(gl.TEXTURE0 + 0)
gl.BindVertexArray(rt.vao)
gl.UniformMatrix4fv(rt.mvpId, 1, false, rt.mvp.Pointer())
gl.DrawElements(gl.TRIANGLES, int32(len(rt.faces)), gl.UNSIGNED_BYTE, 0)
// cleanup
gl.ActiveTexture(0)
gl.UseProgram(0)
gl.BindVertexArray(0)
}