Python sdl.Shader类代码示例

class SampleFilter:
    def __init__(self, xwidth=1.0, ywidth=1.0):

        path = os.path.dirname(__file__)
        path = os.path.join(path, 'flt_shaders')
        self._loader = Loader([path])

        self.xwidth = xwidth
        self.ywidth = ywidth

    def load(self, shader_name):
        args = []
        text = self._loader.load(shader_name, 'props.txt')
        if text is not None:
            args = parse_args(text)

        args.append(FloatArg('xwidth', self.xwidth))
        args.append(FloatArg('ywidth', self.ywidth))

        code = self._loader.load(shader_name, 'code.py')
        if code is None:
            raise ValueError("code.py in %s shader dont exist!" % shader_name)

        func_args = [StructArgPtr('sample', Sample.factory())]

        self.shader = Shader(code=code, args=args, name='filter_sample',
                             func_args=func_args, is_func=True)

    def compile(self, shaders=[]):
        self.shader.compile(shaders)

    def prepare(self, runtimes):
        self.shader.prepare(runtimes)

class Tmo:
    def __init__(self):
        path = os.path.dirname(__file__)
        path = os.path.join(path, 'shaders')
        self._loader = Loader([path])

        self._shader = None
        self._runtime = None

    @property
    def shader(self):
        return self._shader

    def load(self, name):
        props = self._loader.load(name, 'props.txt')
        args = []
        if props is not None:
            args = parse_args(props)

        in_img = StructArg('input_image', ImagePRGBA(1, 1))
        out_img = StructArg('output_image', ImagePRGBA(1, 1))
        args.extend([in_img, out_img])

        code = self._loader.load(name, 'code.py')
        self._shader = Shader(code=code, args=args)
        self._shader.compile()
        self._runtime = Runtime()
        self._shader.prepare([self._runtime])

    def tmo(self, in_img, out_img):
        """
            Perform tone mapping on input image

            Args:
                in_img:  Input image
                out_img: Output image

        """
        if self._shader is None:
            raise ValueError("Shader is not loaded.")

        if not isinstance(in_img, ImagePRGBA) and not isinstance(out_img, ImagePRGBA):
            raise ValueError("ImagePRGBA is expected insted of", in_img, out_img)

        w1, h1 = in_img.size()
        w2, h2 = out_img.size()
        if w1 != w2 or h1 != h2:
            raise ValueError("Input and output image must be same size!")

        self._shader.set_value('input_image', in_img)
        self._shader.set_value('output_image', out_img)
        self._shader.execute()

    def atest_material_manager(self):
        sam_mgr = SampledManager()
        register_rgb_shadepoint()

        runtimes = [Runtime(), Runtime()]
        mat = Material()
        mat.load('lambertian', sam_mgr, spectral=False)
        mat.set_value('diffuse', RGBSpectrum(0.2, 0.3, 0.4))

        mgr = MaterialManager()
        mgr.add('material1', mat)

        mgr.compile_shaders(sam_mgr, spectral=False)
        mgr.prepare_shaders(runtimes)

        code = """
hp = HitPoint()
sp = ShadePoint()
material_reflectance(hp, sp, 0)
spec = sp.material_reflectance
        """
        spec = RGBArg('spec', RGBSpectrum(0.5, 0.5, 0.5))
        shader = Shader(code=code, args=[spec])
        shader.compile(shaders=[mgr.ref_shader])
        shader.prepare(runtimes)
        shader.execute()

        s = shader.get_value('spec')
        ls = RGBSpectrum(0.2, 0.3, 0.4) * (1.0 / math.pi)

        self.assertAlmostEqual(s.r, ls.r)
        self.assertAlmostEqual(s.g, ls.g)
        self.assertAlmostEqual(s.b, ls.b)

def test_mesh_b(mesh, nrays=1):
    dep_shader = type(mesh).isect_b_shader('ray_flat_mesh_b_isect')
    dep_shader.compile()
    runtimes = [Runtime()]
    dep_shader.prepare(runtimes)

    code = """
min_dist = 99999.0
ret = ray_flat_mesh_b_isect(ray, mesh, min_dist)
    """

    origin = calculate_origin(mesh)
    rpoint = random_in_bbox(mesh._grid.bbox)
    direction = rpoint - origin 
    direction.normalize()

    ray = Ray(origin, direction)
    r_arg = StructArg('ray', ray)
    mesh_arg = StructArg('mesh', mesh)
    ret = IntArg('ret', 6)

    args = [r_arg, mesh_arg, ret]
    shader = Shader(code=code, args=args)
    shader.compile([dep_shader.shader])

    shader.prepare(runtimes)

    hp = mesh.isect_b(ray)
    shader.execute()
    print("Bool isect", hp, shader.get_value('ret'))

class SamplerGenerator():
    def __init__(self, sampler):
        self.sampler = sampler

        self.prepare_standalone()

    def prepare_standalone(self):

        self.sampler.create_shader()

        runtimes = [Runtime()]
        self.sampler.compile()
        self.sampler.prepare(runtimes)

        code = """
ret = generate_sample(sample)
        """
        args = [StructArg('sample', Sample.factory()), IntArg('ret', 11)]
        self._standalone = Shader(code=code, args=args)
        self._standalone.compile([self.sampler.shader])
        self._standalone.prepare(runtimes)

    def generate_sample(self):

        self._standalone.execute()
        ret = self._standalone.get_value('ret')
        if ret == 0:
            return False
        sample = self._standalone.get_value('sample')
        return sample

    def test_sampled_point_light(self):
        sam_mgr = SampledManager()
        register_sampled_shadepoint(sam_mgr)

        runtimes = [Runtime()]
        lgt = GeneralLight()
        lgt.load('point', sam_mgr, spectral=True)
        lgt.set_value('intensity', RGBSpectrum(0.3, 0.3, 0.3))
        lgt.set_value('position', Vector3(2.0, 2.0, 2.0))
        lgt.compile()
        lgt.prepare(runtimes)
        ptrs = lgt.shader.get_ptrs()

        ptr_func = PointerArg('ptr_func', ptrs[0])
        spec = SampledArg('spec', sam_mgr.zero())
        wi = Vec3Arg('wi', Vector3(0.0, 0.0, 0.0))
        pos = Vec3Arg('position', Vector3(0.0, 0.0, 0.0))

        code = """
hp = HitPoint()
hp.hit = (4.0, 5, 6)
sp = ShadePoint()
__light_radiance(hp, sp, ptr_func)
spec = sp.light_intensity
wi = sp.wi
position = sp.light_position
        """
        shader = Shader(code=code, args=[ptr_func, wi, spec, pos])
        shader.compile()
        shader.prepare(runtimes)
        shader.execute()

        wi = Vector3(2.0, 2.0, 2.0) - Vector3(4.0, 5.0, 6.0)
        wi.normalize()
        wi_s = shader.get_value('wi')
        self.assertAlmostEqual(wi.x, wi_s.x)
        self.assertAlmostEqual(wi.y, wi_s.y)
        self.assertAlmostEqual(wi.z, wi_s.z)

        p = Vector3(2.0, 2.0, 2.0)
        p_s = shader.get_value('position')
        self.assertAlmostEqual(p.x, p_s.x)
        self.assertAlmostEqual(p.y, p_s.y)
        self.assertAlmostEqual(p.z, p_s.z)

        s = sam_mgr.rgb_to_sampled(RGBSpectrum(0.3, 0.3, 0.3), illum=True)
        s_s = shader.get_value('spec')

        for i in range(len(s.samples)):
            self.assertAlmostEqual(s.samples[i], s_s.samples[i])

    def test_isect_b_rect(self):
        rect_shader = Rectangle.isect_b_shader('isect_b_rectangle')
        rect_shader.compile()
        runtimes = [Runtime()]
        rect_shader.prepare(runtimes)

        code = """
min_dist = 99999.0
p1 = isect_b_rectangle(ray, rectangle, min_dist)
        """

        origin = Vector3(3.0, 2.5, 0.0)
        direction = Vector3(0.0, 0.1, 0.88)
        direction.normalize()
        ray = Ray(origin, direction)

        point = Vector3(0.0, 0.0, 55.92)
        e1 = Vector3(55.28, 0.0, 0.0)
        e2 = Vector3(0.0, 54.88, 0.0)
        normal = Vector3(0.0, 0.0, -1.0)
        rectangle = Rectangle(point, e1, e2, normal)

        r_arg = StructArg('ray', ray)
        sph_arg = StructArg('rectangle', rectangle)
        p1 = IntArg('p1', 6)

        args = [r_arg, sph_arg, p1]
        shader = Shader(code=code, args=args)
        shader.compile([rect_shader.shader])

        shader.prepare(runtimes)
        shader.execute()

        result = shader.get_value('p1')
        self.assertEqual(result, 1)

    def test_isect_b_sph(self):
        sph_shader = Sphere.isect_b_shader('isect_b_sphere')
        sph_shader.compile()
        runtimes = [Runtime()]
        sph_shader.prepare(runtimes)

        code = """
min_dist = 99999.0
p1 = isect_b_sphere(ray, sphere, min_dist)
        """

        direction = Vector3(-1.0, -1.0, -1.0)
        direction.normalize()
        ray = Ray(Vector3(5.0, 5.0, 5.0), direction)
        sphere = Sphere(Vector3(0.0, 0.0, 0.0), 2.0, 0)

        r_arg = StructArg('ray', ray)
        sph_arg = StructArg('sphere', sphere)
        p1 = IntArg('p1', 6)

        args = [r_arg, sph_arg, p1]
        shader = Shader(code=code, args=args)
        shader.compile([sph_shader.shader])

        shader.prepare(runtimes)
        shader.execute()

        result = shader.get_value('p1')
        self.assertEqual(result, 1)

    def test_sampled_to_rgb(self):
        runtimes = [Runtime()]

        color_mgr = SampledManager()
        s_to_rgb = spectrum_to_rgb_shader(color_mgr)
        s_to_rgb.compile(color_mgr=color_mgr)
        s_to_rgb.prepare(runtimes)

        code = """
value = spectrum_to_rgb(color)
        """
        spec = RGBSpectrum(0.3, 0.5, 0.4)
        spec = color_mgr.rgb_to_sampled(spec)
        col = SampledArg('color', spec)
        val = Vec3Arg('value', Vector3(0.0, 0.0, 0.0))
        shader = Shader(code=code, args=[col, val])
        shader.compile(shaders=[s_to_rgb], color_mgr=color_mgr)
        shader.prepare(runtimes)
        shader.execute()

        value = shader.get_value('value')
        vv = color_mgr.sampled_to_rgb(spec)
        self.assertAlmostEqual(value.x, vv.r)
        self.assertAlmostEqual(value.y, vv.g)
        self.assertAlmostEqual(value.z, vv.b, places=6)

    def test_linear(self):
        sphere = Sphere(Vector3(0.0, 0.0, 0.0), 2.0, 0)
        mgr = ShapeManager()
        mgr.add('sph1', sphere)
        sphere2 = Sphere(Vector3(0.0, 2.0, 0.0), 3.0, 0)
        mgr.add('sph2', sphere2)

        isector = LinearIsect(mgr)
        runtimes = [Runtime()]

        direction = Vector3(-1.0, -1.0, -1.0)
        direction.normalize()
        ray = Ray(Vector3(5.0, 5.0, 5.0), direction)

        isector.compile()
        isector.prepare(runtimes)

        code = """
min_dist = 99999.0
p1 = isect_scene(ray, hitpoint, min_dist)
        """
        direction = Vector3(-1.0, -1.0, -1.0)
        direction.normalize()
        ray = Ray(Vector3(5.0, 5.0, 5.0), direction)
        hitpoint = HitPoint(0.0, Vector3(0.0, 0.0, 0.0),
                            Vector3(0.0, 0.0, 0.0), 6, 0.0, 0.0)

        r_arg = StructArg('ray', ray)
        harg = StructArg('hitpoint', hitpoint)
        p1 = IntArg('p1', 6)

        args = [r_arg, harg, p1]
        shader = Shader(code=code, args=args)
        shader.compile([isector.shader])
        shader.prepare(runtimes)

        hp2 = isector.isect(ray)
        shader.execute()

        hitpoint = shader.get_value('hitpoint')

        self.assertAlmostEqual(hp2.t, hitpoint.t, places=5)
        self.assertEqual(hp2.mat_idx, hitpoint.mat_idx)
        n1 = hp2.normal
        n2 = hitpoint.normal
        self.assertAlmostEqual(n1.x, n2.x)
        self.assertAlmostEqual(n1.y, n2.y, places=6)
        self.assertAlmostEqual(n1.z, n2.z)
        self.assertAlmostEqual(hitpoint.hit.x, hp2.hit.x, places=6)
        self.assertAlmostEqual(hitpoint.hit.y, hp2.hit.y, places=6)
        self.assertAlmostEqual(hitpoint.hit.z, hp2.hit.z, places=6)

        result = shader.get_value('p1')
        self.assertEqual(result, 1)

    def test_isect_rect(self):
        rect_shader = Rectangle.isect_shader('isect_rectangle')
        rect_shader.compile()
        runtimes = [Runtime()]
        rect_shader.prepare(runtimes)

        code = """
min_dist = 99999.0
p1 = isect_rectangle(ray, rectangle, hitpoint, min_dist)
        """

        origin = Vector3(3.0, 2.5, 0.0)
        direction = Vector3(0.0, 0.1, 0.88)
        direction.normalize()
        ray = Ray(origin, direction)

        point = Vector3(0.0, 0.0, 55.92)
        e1 = Vector3(55.28, 0.0, 0.0)
        e2 = Vector3(0.0, 54.88, 0.0)
        normal = Vector3(0.0, 0.0, -1.0)
        rectangle = Rectangle(point, e1, e2, normal)

        hitpoint = HitPoint.factory()
        hitpoint.mat_idx = 5

        r_arg = StructArg('ray', ray)
        sph_arg = StructArg('rectangle', rectangle)
        harg = StructArg('hitpoint', hitpoint)
        p1 = IntArg('p1', 6)

        args = [r_arg, sph_arg, harg, p1]
        shader = Shader(code=code, args=args)
        shader.compile([rect_shader.shader])
        shader.prepare(runtimes)

        shader.execute()
        hp2 = rectangle.isect(ray)

        hitpoint = shader.get_value('hitpoint')
        self.assertAlmostEqual(hp2.t, hitpoint.t, places=5)
        self.assertEqual(hp2.mat_idx, hitpoint.mat_idx)
        n1 = hp2.normal
        n2 = hitpoint.normal
        self.assertAlmostEqual(n1.x, n2.x)
        self.assertAlmostEqual(n1.y, n2.y)
        self.assertAlmostEqual(n1.z, n2.z)
        self.assertAlmostEqual(hitpoint.hit.x, hp2.hit.x, places=5)
        self.assertAlmostEqual(hitpoint.hit.y, hp2.hit.y, places=5)
        self.assertAlmostEqual(hitpoint.hit.z, hp2.hit.z, places=5)

        result = shader.get_value('p1')
        self.assertEqual(result, 1)

    def load(self, shader_name, color_mgr, image_factory=None):
        self._color_mgr = color_mgr
        self._shader_name = shader_name
        self._image_factory = image_factory

        code = self._loader.load(shader_name, 'bsdf.py')
        if code is None:
            raise ValueError("bsdf.py in %s doesnt exist!" % shader_name)
        
        args = self._load_args()
        name = 'material_%i' % id(args)
        s = color_mgr.zero()
        func_args = self._func_args(s)
        self._bsdf_shader = Shader(code=code, args=args, name=name,
                                   func_args=func_args, is_func=True)

        #Sampling shader
        code = self._loader.load(self._shader_name, 'sample.py')
        if code is None:
            code = self._default_sampling()

        args = self._load_args()
        ptr_mat_bsdf = PointerArg('ptr_mat_bsdf', 0)
        ptr_mat_pdf = PointerArg('ptr_mat_pdf', 0)
        ptr_bsdf = ArgList('ptr_mat_bsdf', [ptr_mat_bsdf])
        ptr_pdf = ArgList('ptr_mat_pdf', [ptr_mat_pdf])
        args.append(ptr_bsdf)
        args.append(ptr_pdf)

        name = 'material_sampling_%i' % id(args)
        func_args = self._func_args(s)
        self._sampling_shader = Shader(code=code, args=args, name=name,
                                       func_args=func_args, is_func=True)

        #material pdf
        code = self._loader.load(self._shader_name, 'pdf.py')
        if code is None:
            code = self._default_pdf()
        args = self._load_args()
        name = 'material_pdf_%i' % id(args)
        func_args = self._func_args(s)
        self._pdf_shader = Shader(code=code, args=args, name=name,
                                  func_args=func_args, is_func=True)

    def test_material_sampling_manager(self):
        sam_mgr = SampledManager()
        register_rgb_shadepoint()

        runtimes = [Runtime(), Runtime()]
        mat = Material()
        mat.load('lambertian', sam_mgr, spectral=False)
        mat.set_value('diffuse', RGBSpectrum(0.2, 0.3, 0.4))

        mgr = MaterialManager()
        mgr.add('material1', mat)

        mgr.compile_shaders(sam_mgr, spectral=False)
        mgr.prepare_shaders(runtimes)

        code = """
hp = HitPoint()
hp.normal = (0.1, 0.4, 0.66)
hp.normal = normalize(hp.normal)
sp = ShadePoint()
material_sampling(hp, sp, 0)
pdf = sp.pdf
wi = sp.wi
spec = sp.material_reflectance
        """
        pdf = FloatArg('pdf', 0.0)
        wi = Vec3Arg('wi', Vector3(0.0, 0.0, 0.0))
        spec = RGBArg('spec', RGBSpectrum(0.5, 0.5, 0.5))
        shader = Shader(code=code, args=[pdf, wi, spec])
        shader.compile(shaders=[mgr.sampling_shader])
        shader.prepare(runtimes)
        shader.execute()

        s = shader.get_value('pdf')
        print(s)
        s = shader.get_value('wi')
        print(s)
        s = shader.get_value('spec')
        print(s)
        normal = Vector3(0.1, 0.4, 0.66)
        normal.normalize()
        print(cos_hemisphere(r1=0.1, r2=0.06, normal=normal,e=1.0))

    def _lgt_radiance(self, color_mgr):
        code = """
ptr_func = lgt_ptrs[mat_idx]
__light_radiance(hitpoint, shadepoint, ptr_func)
        """
        lgt_ptrs = ArrayArg('lgt_ptrs', PtrsArray())
        al = ArgList('lgt_ptrs', [lgt_ptrs])
        func_args = self._func_args(color_mgr.zero())
        args = [al]
        self.rad_shader = Shader(code=code, args=args, name='light_radiance',
                                 func_args=func_args, is_func=True)

    def _mtl_pdf(self, color_mgr):
        code = """
ptr_func = mtl_pdf_ptrs[mat_idx]
__material_pdf(hitpoint, shadepoint, ptr_func)
        """
        pdf_ptrs = ArrayArg('mtl_pdf_ptrs', PtrsArray())
        al = ArgList('mtl_pdf_ptrs', [pdf_ptrs])
        func_args = self._func_args(color_mgr.zero())
        args = [al]
        self.pdf_shader = Shader(code=code, args=args, name='material_pdf',
                                 func_args=func_args, is_func=True)