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Move template c code from source code to template files.
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@rokups @ocornut
rokups authored and ocornut committed May 7, 2024
1 parent 3755745 commit fcd3715
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Showing 3 changed files with 278 additions and 247 deletions.
267 changes: 20 additions & 247 deletions gl3w_gen.py
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Original file line number Diff line number Diff line change
Expand Up @@ -39,37 +39,6 @@
except ImportError:
import urllib2

# UNLICENSE copyright header
UNLICENSE = r'''/*
* This file was generated with gl3w_gen.py, part of gl3w
* (hosted at https://github.com/skaslev/gl3w)
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
'''

EXT_SUFFIX = ['ARB', 'EXT', 'KHR', 'OVR', 'NV', 'AMD', 'INTEL']

def is_ext(proc):
Expand Down Expand Up @@ -125,227 +94,31 @@ def download(url, dst):
# Generate gl3w.h
print('Generating {0}...'.format(os.path.join(args.root, 'include/GL/gl3w.h')))
with open(os.path.join(args.root, 'include/GL/gl3w.h'), 'wb') as f:
write(f, UNLICENSE)
write(f, r'''#ifndef __gl3w_h_
#define __gl3w_h_
#include <GL/glcorearb.h>
#ifndef GL3W_API
#define GL3W_API
#endif
#ifndef __gl_h_
#define __gl_h_
#endif
#ifdef __cplusplus
extern "C" {
#endif
#define GL3W_OK 0
#define GL3W_ERROR_INIT -1
#define GL3W_ERROR_LIBRARY_OPEN -2
#define GL3W_ERROR_OPENGL_VERSION -3
typedef void (*GL3WglProc)(void);
typedef GL3WglProc (*GL3WGetProcAddressProc)(const char *proc);
/* gl3w api */
GL3W_API int gl3wInit(void);
GL3W_API int gl3wInit2(GL3WGetProcAddressProc proc);
GL3W_API int gl3wIsSupported(int major, int minor);
GL3W_API GL3WglProc gl3wGetProcAddress(const char *proc);
/* gl3w internal state */
''')
write(f, 'union GL3WProcs {\n')
write(f, '\tGL3WglProc ptr[{0}];\n'.format(len(procs)))
write(f, '\tstruct {\n')
gl3w_h = open(os.path.join(args.root, 'template/gl3w.h'), 'r', encoding='utf-8').read()
strings = [
'/* gl3w internal state */',
'union GL3WProcs {',
'\tGL3WglProc ptr[{0}];'.format(len(procs)),
'\tstruct {'
]
for proc in procs:
write(f, '\t\t{0: <55} {1};\n'.format('PFN{0}PROC'.format(proc.upper()), proc[2:]))
write(f, r''' } gl;
};
GL3W_API extern union GL3WProcs gl3wProcs;
strings.append('\t\t{0: <55} {1};'.format('PFN{0}PROC'.format(proc.upper()), proc[2:]))
strings.append('\t} gl;') # struct
strings.append('};') # union GL3WProcs
gl3w_h = gl3w_h.replace(strings[0], '\n'.join(strings))

/* OpenGL functions */
''')
strings = ['/* OpenGL functions */']
for proc in procs:
write(f, '#define {0: <48} gl3wProcs.gl.{1}\n'.format(proc, proc[2:]))
write(f, r'''
#ifdef __cplusplus
}
#endif
#endif
''')
strings.append('#define {0: <48} gl3wProcs.gl.{1}'.format(proc, proc[2:]))
gl3w_h = gl3w_h.replace(strings[0], '\n'.join(strings))
write(f, gl3w_h)

# Generate gl3w.c
print('Generating {0}...'.format(os.path.join(args.root, 'src/gl3w.c')))
with open(os.path.join(args.root, 'src/gl3w.c'), 'wb') as f:
write(f, UNLICENSE)
write(f, r'''#include <GL/gl3w.h>
#include <stdlib.h>
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#if defined(_WIN32)
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif
#include <windows.h>
static HMODULE libgl;
typedef PROC(__stdcall* GL3WglGetProcAddr)(LPCSTR);
static GL3WglGetProcAddr wgl_get_proc_address;
static int open_libgl(void)
{
libgl = LoadLibraryA("opengl32.dll");
if (!libgl)
return GL3W_ERROR_LIBRARY_OPEN;
wgl_get_proc_address = (GL3WglGetProcAddr)GetProcAddress(libgl, "wglGetProcAddress");
return GL3W_OK;
}
static void close_libgl(void)
{
FreeLibrary(libgl);
}
static GL3WglProc get_proc(const char *proc)
{
GL3WglProc res;
res = (GL3WglProc)wgl_get_proc_address(proc);
if (!res)
res = (GL3WglProc)GetProcAddress(libgl, proc);
return res;
}
#elif defined(__APPLE__)
#include <dlfcn.h>
static void *libgl;
static int open_libgl(void)
{
libgl = dlopen("/System/Library/Frameworks/OpenGL.framework/OpenGL", RTLD_LAZY | RTLD_LOCAL);
if (!libgl)
return GL3W_ERROR_LIBRARY_OPEN;
return GL3W_OK;
}
static void close_libgl(void)
{
dlclose(libgl);
}
static GL3WglProc get_proc(const char *proc)
{
GL3WglProc res;
*(void **)(&res) = dlsym(libgl, proc);
return res;
}
#else
#include <dlfcn.h>
static void *libgl;
static GL3WglProc (*glx_get_proc_address)(const GLubyte *);
static int open_libgl(void)
{
libgl = dlopen("libGL.so.1", RTLD_LAZY | RTLD_LOCAL);
if (!libgl)
return GL3W_ERROR_LIBRARY_OPEN;
*(void **)(&glx_get_proc_address) = dlsym(libgl, "glXGetProcAddressARB");
return GL3W_OK;
}
static void close_libgl(void)
{
dlclose(libgl);
}
static GL3WglProc get_proc(const char *proc)
{
GL3WglProc res;
res = glx_get_proc_address((const GLubyte *)proc);
if (!res)
*(void **)(&res) = dlsym(libgl, proc);
return res;
}
#endif
static struct {
int major, minor;
} version;
static int parse_version(void)
{
if (!glGetIntegerv)
return GL3W_ERROR_INIT;
glGetIntegerv(GL_MAJOR_VERSION, &version.major);
glGetIntegerv(GL_MINOR_VERSION, &version.minor);
if (version.major < 3)
return GL3W_ERROR_OPENGL_VERSION;
return GL3W_OK;
}
static void load_procs(GL3WGetProcAddressProc proc);
int gl3wInit(void)
{
int res;
res = open_libgl();
if (res)
return res;
atexit(close_libgl);
return gl3wInit2(get_proc);
}
int gl3wInit2(GL3WGetProcAddressProc proc)
{
load_procs(proc);
return parse_version();
}
int gl3wIsSupported(int major, int minor)
{
if (major < 3)
return 0;
if (version.major == major)
return version.minor >= minor;
return version.major >= major;
}
GL3WglProc gl3wGetProcAddress(const char *proc)
{
return get_proc(proc);
}
static const char *proc_names[] = {
''')
gl3w_c = open(os.path.join(args.root, 'template/gl3w.c'), 'r', encoding='utf-8').read()
strings = ['static const char *proc_names[] = {']
for proc in procs:
write(f, '\t"{0}",\n'.format(proc))
write(f, r'''};
GL3W_API union GL3WProcs gl3wProcs;
static void load_procs(GL3WGetProcAddressProc proc)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(proc_names); i++)
gl3wProcs.ptr[i] = proc(proc_names[i]);
}
''')
strings.append('\t"{0}",'.format(proc))
gl3w_c = gl3w_c.replace(strings[0], '\n'.join(strings))
write(f, gl3w_c)
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