258 lines
7.1 KiB
Python
258 lines
7.1 KiB
Python
import xml.etree.ElementTree as et
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from argparse import ArgumentParser
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from datetime import datetime
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#---------------------------------------------------------------
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#NOTE: get args
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#---------------------------------------------------------------
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parser = ArgumentParser()
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parser.add_argument("-s", "--spec")
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parser.add_argument("-d", "--directory")
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args = parser.parse_args()
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apiName = 'gl_api'
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loaderName = 'gl_loader'
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apiPath = args.directory + '/' + apiName + '.h'
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loaderHeaderPath = args.directory + '/' + loaderName + '.h'
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loaderCPath = args.directory + '/' + loaderName + '.c'
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#---------------------------------------------------------------
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#NOTE: gather all GL functions in GL 4.1, 4.3, and GLES 3.0 and 3.1
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#---------------------------------------------------------------
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def gather_api(tree, api, version):
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procs = []
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for feature in tree.iterfind('feature[@api="'+ api +'"]'):
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if float(feature.get('number')) > version:
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break
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for require in feature.iter('require'):
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if require.get('profile') == 'compatibility':
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continue
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for command in require.iter('command'):
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procs.append(command.get('name'))
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for remove in feature.iter('remove'):
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for command in remove.iter('command'):
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procs.remove(command.get('name'))
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return(procs)
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tree = et.parse(args.spec)
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# put all GL commands in a dict
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commands = dict()
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commandsSpec = tree.find('./commands')
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for command in commandsSpec.iter('command'):
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name = command.find('proto/name')
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commands[name.text] = command
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#gather command names per API
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gl41 = gather_api(tree, 'gl', 4.1)
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gl43 = gather_api(tree, 'gl', 4.3)
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gl44 = gather_api(tree, 'gl', 4.4)
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gles31 = gather_api(tree, 'gles2', 3.1)
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gles32 = gather_api(tree, 'gles2', 3.2)
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glall = list(set().union(gl41, gl43, gl44, gles31, gles32))
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#---------------------------------------------------------------
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# helpers
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#---------------------------------------------------------------
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def emit_doc(f, name, ext):
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f.write("/********************************************************\n")
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f.write("*\n")
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f.write("*\t@file: " + name + ext + '\n')
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f.write("*\t@note: auto-generated by glapi.py from gl.xml\n")
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f.write("*\t@date: %s\n" % datetime.now().strftime("%d/%m%Y"))
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f.write("*\n")
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f.write("*********************************************************/\n")
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def emit_begin_guard(f, name):
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guard = '__' + name.upper() + '_H__'
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f.write("#ifndef " + guard + "\n")
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f.write("#define " + guard + "\n\n")
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def emit_end_guard(f, name):
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guard = '__' + name.upper() + '_H__'
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f.write("#endif // " + guard + "\n")
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def remove_prefix(s, prefix):
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if s.startswith(prefix):
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return s[len(prefix):]
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#---------------------------------------------------------------
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# Generate GL API header file
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#---------------------------------------------------------------
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f = open(apiPath, 'w')
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emit_doc(f, apiName, '.h')
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emit_begin_guard(f, apiName)
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f.write('#include"GL/glcorearb.h"\n')
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f.write('#include"GLES3/gl32.h"\n\n')
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# generate interface struct
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f.write('typedef struct oc_gl_api\n{\n')
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f.write(' const char* name;\n')
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for func in glall:
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f.write('\t' + 'PFN' + func.upper() + 'PROC ' + remove_prefix(func, 'gl') + ';\n')
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f.write('} oc_gl_api;\n\n')
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# generate interface macros
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# TODO guard for different api/versions and only #define functions present in desired version
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f.write("ORCA_API oc_gl_api* oc_gl_get_api(void);\n\n")
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for func in glall:
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f.write('#define ' + func + ' oc_gl_get_api()->' + remove_prefix(func, 'gl') + '\n')
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emit_end_guard(f, apiName)
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f.close()
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#---------------------------------------------------------------
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# Generate GL loader header
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#---------------------------------------------------------------
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f = open(loaderHeaderPath, 'w')
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emit_doc(f, loaderName, '.h')
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emit_begin_guard(f, loaderName)
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f.write('#include"gl_api.h"\n\n')
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f.write("typedef void*(*oc_gl_load_proc)(const char* name);\n\n")
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f.write("void oc_gl_load_gl41(oc_gl_api* api, oc_gl_load_proc loadProc);\n")
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f.write("void oc_gl_load_gl43(oc_gl_api* api, oc_gl_load_proc loadProc);\n")
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f.write("void oc_gl_load_gl44(oc_gl_api* api, oc_gl_load_proc loadProc);\n")
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f.write("void oc_gl_load_gles30(oc_gl_api* api, oc_gl_load_proc loadProc);\n")
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f.write("void oc_gl_load_gles31(oc_gl_api* api, oc_gl_load_proc loadProc);\n\n")
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f.write("void oc_gl_select_api(oc_gl_api* api);\n\n")
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emit_end_guard(f, loaderName)
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f.close()
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#---------------------------------------------------------------
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# Generate GL loader code
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#---------------------------------------------------------------
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def emit_loader(f, name, procs):
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f.write('void oc_gl_load_'+ name +'(oc_gl_api* api, oc_gl_load_proc loadProc)\n')
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f.write("{\n")
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f.write(' api->name = "'+ name +'";\n')
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for proc in glall:
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if proc in procs:
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f.write(' api->' + remove_prefix(proc, 'gl') + ' = loadProc("' + proc + '");\n')
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else:
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f.write(' api->' + remove_prefix(proc, 'gl') + ' = oc_' + proc + '_noimpl;\n')
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f.write("}\n\n")
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def emit_null_api(f, procs):
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f.write('oc_gl_api oc_glNoAPI;\n\n')
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for name in procs:
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command = commands.get(name)
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if command == None:
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print("Couldn't find definition for required command '" + name + "'")
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exit(-1)
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proto = command.find("proto")
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ptype = proto.find("ptype")
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retType = ''
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if proto.text != None:
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retType += proto.text
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if ptype != None:
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if ptype.text != None:
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retType += ptype.text
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if ptype.tail != None:
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retType += ptype.tail
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retType = retType.strip()
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f.write(retType + ' oc_' + name + '_noimpl(')
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params = command.findall('param')
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if len(params) == 0:
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f.write('void')
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for i, param in enumerate(params):
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argName = param.find('name').text
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typeNode = param.find('ptype')
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typeName = ''
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if param.text != None:
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typeName += param.text
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if typeNode != None:
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if typeNode.text != None:
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typeName += typeNode.text
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if typeNode.tail != None:
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typeName += typeNode.tail
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typeName = typeName.strip()
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f.write(typeName + ' ' + argName)
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if i < len(params)-1:
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f.write(', ')
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f.write(')\n')
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f.write('{\n')
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f.write(' if(oc_glAPI == &oc_glNoAPI)\n')
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f.write(' {\n')
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f.write(' oc_log_error("No GL or GLES API is selected. Make sure you call oc_surface_prepare() before calling OpenGL API functions.\\n");\n')
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f.write(' }\n')
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f.write(' else\n')
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f.write(' {\n')
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f.write(' oc_log_error("'+ name +' is not part of currently selected %s API\\n", oc_glAPI->name);\n')
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f.write(' }\n')
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if retType != 'void':
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f.write(' return(('+ retType +')0);\n')
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f.write('}\n')
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f.write('oc_gl_api oc_glNoAPI = {\n')
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for proc in procs:
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f.write(' .' + remove_prefix(proc, 'gl') + ' = oc_' + proc + '_noimpl,\n')
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f.write("};\n\n")
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f = open(loaderCPath, 'w')
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emit_doc(f, loaderName, '.c')
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f.write('#include"' + loaderName + '.h"\n')
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f.write('#include"platform/platform.h"\n\n')
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f.write("oc_thread_local oc_gl_api* oc_glAPI = 0;\n")
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emit_null_api(f, glall)
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emit_loader(f, 'gl41', gl41)
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emit_loader(f, 'gl43', gl43)
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emit_loader(f, 'gl44', gl44)
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emit_loader(f, 'gles31', gles31)
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emit_loader(f, 'gles32', gles32)
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f.write("void oc_gl_select_api(oc_gl_api* api){ oc_glAPI = api; }\n")
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f.write("void oc_gl_deselect_api(){ oc_glAPI = &oc_glNoAPI; }\n")
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f.write("oc_gl_api* oc_gl_get_api(void) { return(oc_glAPI); }\n\n")
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f.close()
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