#!/usr/bin/env python3 # Copyright 2019 The Dawn Authors # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import os, json, sys from collections import namedtuple import xml.etree.ElementTree as etree from generator_lib import Generator, run_generator, FileRender class ProcName: def __init__(self, gl_name, proc_name=None): assert gl_name.startswith('gl') if proc_name == None: proc_name = gl_name[2:] self.gl_name = gl_name self.proc_name = proc_name def glProcName(self): return self.gl_name def ProcName(self): return self.proc_name def PFNPROCNAME(self): return 'PFN' + self.gl_name.upper() + 'PROC' def __repr__(self): return 'Proc("{}", "{}")'.format(self.gl_name, self.proc_name) ProcParam = namedtuple('ProcParam', ['name', 'type']) class Proc: def __init__(self, element): # Type declaration for return values and arguments all have the same # (weird) format. # <element>[A][<ptype>B</ptype>][C]<other stuff.../></element> # # Some examples are: # <proto>void <name>glFinish</name></proto> # <proto><ptype>GLenum</ptype><name>glFenceSync</name></proto> # <proto>const <ptype>GLubyte</ptype> *<name>glGetString</name></proto> # # This handles all the shapes found in gl.xml except for this one that # has an array specifier after </name>: # <param><ptype>GLuint</ptype> <name>baseAndCount</name>[2]</param> def parse_type_declaration(element): result = '' if element.text != None: result += element.text ptype = element.find('ptype') if ptype != None: result += ptype.text if ptype.tail != None: result += ptype.tail return result.strip() proto = element.find('proto') self.return_type = parse_type_declaration(proto) self.params = [] for param in element.findall('./param'): self.params.append( ProcParam( param.find('name').text, parse_type_declaration(param))) self.gl_name = proto.find('name').text self.alias = None if element.find('alias') != None: self.alias = element.find('alias').attrib['name'] def glProcName(self): return self.gl_name def ProcName(self): assert self.gl_name.startswith('gl') return self.gl_name[2:] def PFNGLPROCNAME(self): return 'PFN' + self.gl_name.upper() + 'PROC' def __repr__(self): return 'Proc("{}")'.format(self.gl_name) EnumDefine = namedtuple('EnumDefine', ['name', 'value']) Version = namedtuple('Version', ['major', 'minor']) VersionBlock = namedtuple('VersionBlock', ['version', 'procs', 'enums']) HeaderBlock = namedtuple('HeaderBlock', ['description', 'procs', 'enums']) ExtensionBlock = namedtuple('ExtensionBlock', ['extension', 'procs', 'enums', 'supported_specs']) def parse_version(version): return Version(*map(int, version.split('.'))) def compute_params(root, supported_extensions): # Parse all the commands and enums all_procs = {} for command in root.findall('''commands[@namespace='GL']/command'''): proc = Proc(command) assert proc.gl_name not in all_procs all_procs[proc.gl_name] = proc all_enums = {} for enum in root.findall('''enums[@namespace='GL']/enum'''): enum_name = enum.attrib['name'] # Special case an enum we'll never use that has different values in GL and GLES if enum_name == 'GL_ACTIVE_PROGRAM_EXT': continue assert enum_name not in all_enums all_enums[enum_name] = EnumDefine(enum_name, enum.attrib['value']) # Get the list of all Desktop OpenGL function removed by the Core Profile. core_removed_procs = set() for proc in root.findall('''feature/remove[@profile='core']/command'''): core_removed_procs.add(proc.attrib['name']) # Get list of enums and procs per OpenGL ES/Desktop OpenGL version def parse_version_blocks(api, removed_procs=set()): blocks = [] for section in root.findall('''feature[@api='{}']'''.format(api)): section_procs = [] for command in section.findall('./require/command'): proc_name = command.attrib['name'] assert all_procs[proc_name].alias == None if proc_name not in removed_procs: section_procs.append(all_procs[proc_name]) section_enums = [] for enum in section.findall('./require/enum'): section_enums.append(all_enums[enum.attrib['name']]) blocks.append( VersionBlock(parse_version(section.attrib['number']), section_procs, section_enums)) return blocks gles_blocks = parse_version_blocks('gles2') desktop_gl_blocks = parse_version_blocks('gl', core_removed_procs) def parse_extension_block(extension): section = root.find( '''extensions/extension[@name='{}']'''.format(extension)) supported_specs = section.attrib['supported'].split('|') section_procs = [] for command in section.findall('./require/command'): proc_name = command.attrib['name'] assert all_procs[proc_name].alias == None if proc_name not in removed_procs: section_procs.append(all_procs[proc_name]) section_enums = [] for enum in section.findall('./require/enum'): section_enums.append(all_enums[enum.attrib['name']]) return ExtensionBlock(extension, section_procs, section_enums, supported_specs) extension_desktop_gl_blocks = [] extension_gles_blocks = [] for extension in supported_extensions: extension_block = parse_extension_block(extension) if 'gl' in extension_block.supported_specs: extension_desktop_gl_blocks.append(extension_block) if 'gles2' in extension_block.supported_specs: extension_gles_blocks.append(extension_block) # Compute the blocks for headers such that there is no duplicate definition already_added_header_procs = set() already_added_header_enums = set() header_blocks = [] def add_header_block(description, block): block_procs = [] for proc in block.procs: if not proc.glProcName() in already_added_header_procs: already_added_header_procs.add(proc.glProcName()) block_procs.append(proc) block_enums = [] for enum in block.enums: if not enum.name in already_added_header_enums: already_added_header_enums.add(enum.name) block_enums.append(enum) if len(block_procs) > 0 or len(block_enums) > 0: header_blocks.append( HeaderBlock(description, block_procs, block_enums)) for block in gles_blocks: add_header_block( 'OpenGL ES {}.{}'.format(block.version.major, block.version.minor), block) for block in desktop_gl_blocks: add_header_block( 'Desktop OpenGL {}.{}'.format(block.version.major, block.version.minor), block) for block in extension_desktop_gl_blocks: add_header_block(block.extension, block) for block in extension_gles_blocks: add_header_block(block.extension, block) return { 'gles_blocks': gles_blocks, 'desktop_gl_blocks': desktop_gl_blocks, 'extension_desktop_gl_blocks': extension_desktop_gl_blocks, 'extension_gles_blocks': extension_gles_blocks, 'header_blocks': header_blocks, } class OpenGLLoaderGenerator(Generator): def get_description(self): return 'Generates code to load OpenGL function pointers' def add_commandline_arguments(self, parser): parser.add_argument('--gl-xml', required=True, type=str, help='The Khronos gl.xml to use.') parser.add_argument( '--supported-extensions', required=True, type=str, help= 'The JSON file that defines the OpenGL and GLES extensions to use.' ) def get_file_renders(self, args): supported_extensions = [] with open(args.supported_extensions) as f: supported_extensions_json = json.loads(f.read()) supported_extensions = supported_extensions_json[ 'supported_extensions'] params = compute_params( etree.parse(args.gl_xml).getroot(), supported_extensions) return [ FileRender( 'opengl/OpenGLFunctionsBase.cpp', 'src/dawn_native/opengl/OpenGLFunctionsBase_autogen.cpp', [params]), FileRender('opengl/OpenGLFunctionsBase.h', 'src/dawn_native/opengl/OpenGLFunctionsBase_autogen.h', [params]), FileRender('opengl/opengl_platform.h', 'src/dawn_native/opengl/opengl_platform_autogen.h', [params]), ] def get_dependencies(self, args): return [os.path.abspath(args.gl_xml)] if __name__ == '__main__': sys.exit(run_generator(OpenGLLoaderGenerator()))