mirror of
https://gitea.wildfiregames.com/0ad/0ad
synced 2026-06-20 23:33:59 -07:00
130 lines
4 KiB
C++
130 lines
4 KiB
C++
/**
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* SPDX-License-Identifier: (WTFPL OR CC0-1.0) AND Apache-2.0
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <glad/wgl.h>
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#ifndef GLAD_IMPL_UTIL_C_
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#define GLAD_IMPL_UTIL_C_
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#ifdef _MSC_VER
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#define GLAD_IMPL_UTIL_SSCANF sscanf_s
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#else
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#define GLAD_IMPL_UTIL_SSCANF sscanf
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#endif
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#endif /* GLAD_IMPL_UTIL_C_ */
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#ifdef __cplusplus
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extern "C" {
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#endif
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int GLAD_WGL_VERSION_1_0 = 0;
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int GLAD_WGL_ARB_extensions_string = 0;
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int GLAD_WGL_EXT_extensions_string = 0;
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int GLAD_WGL_EXT_swap_control = 0;
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PFNWGLGETEXTENSIONSSTRINGARBPROC glad_wglGetExtensionsStringARB = NULL;
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PFNWGLGETEXTENSIONSSTRINGEXTPROC glad_wglGetExtensionsStringEXT = NULL;
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PFNWGLGETSWAPINTERVALEXTPROC glad_wglGetSwapIntervalEXT = NULL;
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PFNWGLSWAPINTERVALEXTPROC glad_wglSwapIntervalEXT = NULL;
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static void glad_wgl_load_WGL_ARB_extensions_string(GLADuserptrloadfunc load, void *userptr) {
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if(!GLAD_WGL_ARB_extensions_string) return;
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glad_wglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC) load(userptr, "wglGetExtensionsStringARB");
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}
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static void glad_wgl_load_WGL_EXT_extensions_string(GLADuserptrloadfunc load, void *userptr) {
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if(!GLAD_WGL_EXT_extensions_string) return;
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glad_wglGetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC) load(userptr, "wglGetExtensionsStringEXT");
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}
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static void glad_wgl_load_WGL_EXT_swap_control(GLADuserptrloadfunc load, void *userptr) {
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if(!GLAD_WGL_EXT_swap_control) return;
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glad_wglGetSwapIntervalEXT = (PFNWGLGETSWAPINTERVALEXTPROC) load(userptr, "wglGetSwapIntervalEXT");
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glad_wglSwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC) load(userptr, "wglSwapIntervalEXT");
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}
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static int glad_wgl_has_extension(HDC hdc, const char *ext) {
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const char *terminator;
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const char *loc;
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const char *extensions;
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if(wglGetExtensionsStringEXT == NULL && wglGetExtensionsStringARB == NULL)
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return 0;
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if(wglGetExtensionsStringARB == NULL || hdc == INVALID_HANDLE_VALUE)
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extensions = wglGetExtensionsStringEXT();
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else
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extensions = wglGetExtensionsStringARB(hdc);
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if(extensions == NULL || ext == NULL)
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return 0;
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while(1) {
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loc = strstr(extensions, ext);
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if(loc == NULL)
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break;
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terminator = loc + strlen(ext);
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if((loc == extensions || *(loc - 1) == ' ') &&
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(*terminator == ' ' || *terminator == '\0'))
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{
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return 1;
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}
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extensions = terminator;
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}
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return 0;
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}
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static GLADapiproc glad_wgl_get_proc_from_userptr(void *userptr, const char* name) {
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return (GLAD_GNUC_EXTENSION (GLADapiproc (*)(const char *name)) userptr)(name);
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}
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static int glad_wgl_find_extensions_wgl(HDC hdc) {
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GLAD_WGL_ARB_extensions_string = glad_wgl_has_extension(hdc, "WGL_ARB_extensions_string");
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GLAD_WGL_EXT_extensions_string = glad_wgl_has_extension(hdc, "WGL_EXT_extensions_string");
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GLAD_WGL_EXT_swap_control = glad_wgl_has_extension(hdc, "WGL_EXT_swap_control");
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return 1;
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}
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static int glad_wgl_find_core_wgl(void) {
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int major = 1, minor = 0;
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GLAD_WGL_VERSION_1_0 = (major == 1 && minor >= 0) || major > 1;
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return GLAD_MAKE_VERSION(major, minor);
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}
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int gladLoadWGLUserPtr(HDC hdc, GLADuserptrloadfunc load, void *userptr) {
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int version;
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wglGetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC) load(userptr, "wglGetExtensionsStringARB");
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wglGetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC) load(userptr, "wglGetExtensionsStringEXT");
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if(wglGetExtensionsStringARB == NULL && wglGetExtensionsStringEXT == NULL) return 0;
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version = glad_wgl_find_core_wgl();
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if (!glad_wgl_find_extensions_wgl(hdc)) return 0;
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glad_wgl_load_WGL_ARB_extensions_string(load, userptr);
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glad_wgl_load_WGL_EXT_extensions_string(load, userptr);
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glad_wgl_load_WGL_EXT_swap_control(load, userptr);
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return version;
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}
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int gladLoadWGL(HDC hdc, GLADloadfunc load) {
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return gladLoadWGLUserPtr(hdc, glad_wgl_get_proc_from_userptr, GLAD_GNUC_EXTENSION (void*) load);
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}
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#ifdef __cplusplus
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}
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#endif
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