Method SetModelMatrix

gui/panel.go:869–889

SetModelMatrix calculates and sets the specified matrix with the model matrix for this panel

(gl *gls.GLS, mm *math32.Matrix4)

// SetModelMatrix calculates and sets the specified matrix with the model matrix for this panel
func (p *Panel) SetModelMatrix(gl *gls.GLS, mm *math32.Matrix4) {

	// Get scale of window (for HiDPI support)
	sX, sY := Manager().win.GetScale()

	// Get the current viewport width and height
	_, _, width, height := gl.GetViewport()

	// Compute common factors
	fX := 2 * float32(sX) / float32(width)
	fY := 2 * float32(sY) / float32(height)

	// Calculate the model matrix
	// Convert pixel coordinates to standard OpenGL clip coordinates and scale the quad for the viewport
	mm.Set(
		fX*float32(p.width), 0, 0, fX*p.pospix.X-1,
		0, fY*float32(p.height), 0, 1-fY*p.pospix.Y,
		0, 0, 1, p.Position().Z,
		0, 0, 0, 1,
	)
}