Example #1
0
func (glRenderer *OpenglRenderer) enableDepthMask(depthMask bool) {
	if depthMask == glRenderer.depthMast {
		return
	}
	gl.DepthMask(depthMask)
	glRenderer.depthMast = depthMask
}
Example #2
0
func (p *LightPass) DrawPass(scene *Scene) {
	/* use light pass shader */
	p.Material.Use()
	shader := p.Material.Shader

	/* compute camera view projection inverse */
	vp := scene.Camera.Projection.Mul4(scene.Camera.View)
	vp_inv := vp.Inv()
	shader.Matrix4f("cameraInverse", &vp_inv[0])

	/* clear */
	gl.ClearColor(0.9, 0.9, 0.9, 1.0)
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	/* set blending mode to additive */

	gl.DepthMask(false)

	/* draw lights */
	lights := scene.FindLights()
	last := len(lights) - 1

	for i, light := range lights {
		if i == 1 {
			/* first light pass we want the shader to restore the depth buffer
			 * then, disable depth masking so that multiple lights can be drawn */
			gl.BlendFunc(gl.ONE, gl.ONE)
		}
		if i == last {
			gl.DepthMask(true)
		}

		/* draw shadow pass for this light into shadow map */
		p.Shadows.DrawPass(scene, &light)

		/* use light pass shader */
		p.Material.Use()

		/* compute world to lightspace (light view projection) matrix */
		lp := light.Projection
		lv := mgl.LookAtV(light.Position, mgl.Vec3{}, mgl.Vec3{0, 1, 0}) // only for directional light
		lvp := lp.Mul4(lv)
		shader.Matrix4f("light_vp", &lvp[0])

		/* set light uniform attributes */
		shader.Vec3("light.Position", &light.Position)
		shader.Vec3("light.Color", &light.Color)
		shader.Int32("light.Type", int32(light.Type))
		shader.Float("light.Range", light.Range)
		shader.Float("light.attenuation.Constant", light.Attenuation.Constant)
		shader.Float("light.attenuation.Linear", light.Attenuation.Linear)
		shader.Float("light.attenuation.Quadratic", light.Attenuation.Quadratic)

		/* render light */
		gl.Viewport(0, 0, int32(scene.Camera.Width), int32(scene.Camera.Height))
		p.quad.Draw()
	}

	/* reset GL state */
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
}