129 lines
4.5 KiB
Python
129 lines
4.5 KiB
Python
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from enum import IntEnum, unique
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from typing import List, Set, Tuple, Union, Optional
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import bpy
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import lnx
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from lnx.material.shader import Shader, ShaderContext, vec3str, floatstr
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if lnx.is_reload(__name__):
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lnx.material.shader = lnx.reload_module(lnx.material.shader)
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from lnx.material.shader import Shader, ShaderContext, vec3str, floatstr
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else:
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lnx.enable_reload(__name__)
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@unique
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class ParserContext(IntEnum):
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"""Describes which kind of node tree is parsed."""
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OBJECT = 0
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# Texture node trees are not supported yet
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# TEXTURE = 1
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WORLD = 2
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@unique
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class ParserPass(IntEnum):
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"""In some situations, a node tree (or a subtree of that) needs
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to be parsed multiple times in different contexts called _passes_.
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Nodes can output different code in reaction to the parser state's
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current pass; for more information on the individual passes
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please refer to below enum items.
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"""
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REGULAR = 0
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"""The tree is parsed to generate regular shader code."""
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DX_SCREEN_SPACE = 1
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"""The tree is parsed to output shader code to compute
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the derivative of a value with respect to the screen's x coordinate."""
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DY_SCREEN_SPACE = 2
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"""The tree is parsed to output shader code to compute
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the derivative of a value with respect to the screen's y coordinate."""
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class ParserState:
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"""Dataclass to keep track of the current state while parsing a shader tree."""
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def __init__(self, context: ParserContext, tree_name: str, world: Optional[bpy.types.World] = None):
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self.context = context
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self.tree_name = tree_name
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self.current_pass = ParserPass.REGULAR
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# The current world, if parsing a world node tree
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self.world = world
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# Active shader - frag for surface / tese for displacement
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self.curshader: Shader = None
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self.con: ShaderContext = None
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self.vert: Shader = None
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self.frag: Shader = None
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self.geom: Shader = None
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self.tesc: Shader = None
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self.tese: Shader = None
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# Group stack (last in the list = innermost group)
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self.parents: List[bpy.types.Node] = []
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# Cache for computing nodes only once
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self.parsed: Set[str] = set()
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# What to parse from the node tree
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self.parse_surface = True
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self.parse_opacity = True
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self.parse_displacement = True
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self.basecol_only = False
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self.procedurals_written: set[Shader] = set()
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# Already exported radiance/irradiance (currently we can only convert
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# an already existing texture as radiance/irradiance)
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self.radiance_written = False
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self.normal_parsed = False
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self.dxdy_varying_input_value = False
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"""Whether the result of the previously parsed node differs
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between fragments and represents an input value to which to apply
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dx/dy offsets (if required by the parser pass).
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"""
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# Shader output values
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self.out_basecol: vec3str = 'vec3(0.8)'
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self.out_roughness: floatstr = '0.0'
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self.out_metallic: floatstr = '0.0'
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self.out_occlusion: floatstr = '1.0'
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self.out_specular: floatstr = '1.0'
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self.out_opacity: floatstr = '1.0'
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self.out_ior: floatstr = '1.450'
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self.out_emission_col: vec3str = 'vec3(0.0)'
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def reset_outs(self):
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"""Reset the shader output values to their default values."""
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self.out_basecol = 'vec3(0.8)'
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self.out_roughness = '0.0'
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self.out_metallic = '0.0'
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self.out_occlusion = '1.0'
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self.out_specular = '1.0'
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self.out_opacity = '1.0'
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self.out_ior = '1.450'
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self.out_emission_col = 'vec3(0.0)'
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def get_outs(self) -> Tuple[vec3str, floatstr, floatstr, floatstr, floatstr, floatstr, floatstr, vec3str]:
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"""Return the shader output values as a tuple."""
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return (self.out_basecol, self.out_roughness, self.out_metallic, self.out_occlusion, self.out_specular,
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self.out_opacity, self.out_ior, self.out_emission_col)
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def get_parser_pass_suffix(self) -> str:
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"""Return a suffix for the current parser pass that can be appended
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to shader variables to avoid compilation errors due to redefinitions.
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"""
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if self.current_pass == ParserPass.DX_SCREEN_SPACE:
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return '_dx'
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elif self.current_pass == ParserPass.DY_SCREEN_SPACE:
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return '_dy'
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return ''
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