func (scene *Floor) Draw(camera Camera) {
shader, _ := scene.UseShader(nil)
gl.Enable(gl.STENCIL_TEST)
gl.StencilFunc(gl.ALWAYS, 1, 0xFF)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.REPLACE)
gl.StencilMask(0xFF)
gl.DepthMask(false)
gl.Clear(gl.STENCIL_BUFFER_BIT)
// Draw floor
gl.Uniform3fv(shader.Uniform("material.ambient"), []float32{0.1, 0.1, 0.1})
scene.Shape.Draw(shader, camera)
// Draw reflections
gl.StencilFunc(gl.EQUAL, 1, 0xFF)
gl.StencilMask(0x00)
gl.DepthMask(true)
view := camera.View()
gl.Uniform3fv(shader.Uniform("material.ambient"), []float32{0.3, 0.3, 0.3})
for _, node := range scene.reflected {
model := node.Transform(scene.transform)
gl.UniformMatrix4fv(shader.Uniform("model"), model[:])
normal := model.Mul4(view).Inv().Transpose()
gl.UniformMatrix4fv(shader.Uniform("normalMatrix"), normal[:])
node.Draw(camera)
}
gl.Disable(gl.STENCIL_TEST)
}
func (shape *Skybox) Draw(camera Camera) {
shader := shape.shader
gl.DepthFunc(gl.LEQUAL)
gl.DepthMask(false)
projection, view := camera.Projection(), camera.View().Mat3().Mat4()
gl.UniformMatrix4fv(shader.Uniform("projection"), projection[:])
gl.UniformMatrix4fv(shader.Uniform("view"), view[:])
gl.BindTexture(gl.TEXTURE_CUBE_MAP, shape.Texture)
gl.BindBuffer(gl.ARRAY_BUFFER, shape.VBO)
gl.EnableVertexAttribArray(shader.Attrib("vertCoord"))
gl.VertexAttribPointer(shader.Attrib("vertCoord"), vertexDim, gl.FLOAT, false, shape.Stride(), 0)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, shape.IBO)
gl.DrawElements(gl.TRIANGLES, len(shape.indices), gl.UNSIGNED_BYTE, 0)
gl.DisableVertexAttribArray(shader.Attrib("vertCoord"))
gl.DepthMask(true)
gl.DepthFunc(gl.LESS)
}
