diff options
Diffstat (limited to 'engine-ocean/External/glew/auto/src/glew_init_gl.c')
| -rw-r--r-- | engine-ocean/External/glew/auto/src/glew_init_gl.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/engine-ocean/External/glew/auto/src/glew_init_gl.c b/engine-ocean/External/glew/auto/src/glew_init_gl.c new file mode 100644 index 0000000..53a5885 --- /dev/null +++ b/engine-ocean/External/glew/auto/src/glew_init_gl.c @@ -0,0 +1,209 @@ +/* ------------------------------------------------------------------------- */ + +static int _glewExtensionCompare(const char *s1, const char *s2) +{ + /* http://www.chanduthedev.com/2012/07/strcmp-implementation-in-c.html */ + while (*s1 || *s2) + { + if (*s1 > *s2) + return 1; + if (*s1 < *s2) + return -1; + s1++; + s2++; + } + return 0; +} + +static ptrdiff_t _glewBsearchExtension(const char* name) +{ + ptrdiff_t lo = 0, hi = sizeof(_glewExtensionLookup) / sizeof(char*) - 2; + + while (lo <= hi) + { + ptrdiff_t mid = (lo + hi) / 2; + const int cmp = _glewExtensionCompare(name, _glewExtensionLookup[mid]); + if (cmp < 0) hi = mid - 1; + else if (cmp > 0) lo = mid + 1; + else return mid; + } + return -1; +} + +static GLboolean *_glewGetExtensionString(const char *name) +{ + ptrdiff_t n = _glewBsearchExtension(name); + if (n >= 0) return &_glewExtensionString[n]; + return NULL; +} + +static GLboolean *_glewGetExtensionEnable(const char *name) +{ + ptrdiff_t n = _glewBsearchExtension(name); + if (n >= 0) return _glewExtensionEnabled[n]; + return NULL; +} + +static const char *_glewNextSpace(const char *i) +{ + const char *j = i; + if (j) + while (*j!=' ' && *j) ++j; + return j; +} + +static const char *_glewNextNonSpace(const char *i) +{ + const char *j = i; + if (j) + while (*j==' ') ++j; + return j; +} + +GLboolean GLEWAPIENTRY glewGetExtension (const char* name) +{ + GLboolean *enable = _glewGetExtensionString(name); + if (enable) + return *enable; + return GL_FALSE; +} + +/* ------------------------------------------------------------------------- */ + +typedef const GLubyte* (GLAPIENTRY * PFNGLGETSTRINGPROC) (GLenum name); +typedef void (GLAPIENTRY * PFNGLGETINTEGERVPROC) (GLenum pname, GLint *params); + +GLenum GLEWAPIENTRY glewContextInit (void) +{ + PFNGLGETSTRINGPROC getString; + const GLubyte* s; + GLuint dot; + GLint major, minor; + + #ifdef _WIN32 + getString = glGetString; + #else + getString = (PFNGLGETSTRINGPROC) glewGetProcAddress((const GLubyte*)"glGetString"); + if (!getString) + return GLEW_ERROR_NO_GL_VERSION; + #endif + + /* query opengl version */ + s = getString(GL_VERSION); + dot = _glewStrCLen(s, '.'); + if (dot == 0) + return GLEW_ERROR_NO_GL_VERSION; + + major = s[dot-1]-'0'; + minor = s[dot+1]-'0'; + + if (minor < 0 || minor > 9) + minor = 0; + if (major<0 || major>9) + return GLEW_ERROR_NO_GL_VERSION; + + if (major == 1 && minor == 0) + { + return GLEW_ERROR_GL_VERSION_10_ONLY; + } + else + { + GLEW_VERSION_4_6 = ( major > 4 ) || ( major == 4 && minor >= 6 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_4_5 = GLEW_VERSION_4_6 == GL_TRUE || ( major == 4 && minor >= 5 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_4_4 = GLEW_VERSION_4_5 == GL_TRUE || ( major == 4 && minor >= 4 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_4_3 = GLEW_VERSION_4_4 == GL_TRUE || ( major == 4 && minor >= 3 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_4_2 = GLEW_VERSION_4_3 == GL_TRUE || ( major == 4 && minor >= 2 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_4_1 = GLEW_VERSION_4_2 == GL_TRUE || ( major == 4 && minor >= 1 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_4_0 = GLEW_VERSION_4_1 == GL_TRUE || ( major == 4 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_3_3 = GLEW_VERSION_4_0 == GL_TRUE || ( major == 3 && minor >= 3 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_3_2 = GLEW_VERSION_3_3 == GL_TRUE || ( major == 3 && minor >= 2 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_3_1 = GLEW_VERSION_3_2 == GL_TRUE || ( major == 3 && minor >= 1 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_3_0 = GLEW_VERSION_3_1 == GL_TRUE || ( major == 3 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_2_1 = GLEW_VERSION_3_0 == GL_TRUE || ( major == 2 && minor >= 1 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_2_0 = GLEW_VERSION_2_1 == GL_TRUE || ( major == 2 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_1_5 = GLEW_VERSION_2_0 == GL_TRUE || ( major == 1 && minor >= 5 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_1_4 = GLEW_VERSION_1_5 == GL_TRUE || ( major == 1 && minor >= 4 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_1_3 = GLEW_VERSION_1_4 == GL_TRUE || ( major == 1 && minor >= 3 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_1_2_1 = GLEW_VERSION_1_3 == GL_TRUE ? GL_TRUE : GL_FALSE; + GLEW_VERSION_1_2 = GLEW_VERSION_1_2_1 == GL_TRUE || ( major == 1 && minor >= 2 ) ? GL_TRUE : GL_FALSE; + GLEW_VERSION_1_1 = GLEW_VERSION_1_2 == GL_TRUE || ( major == 1 && minor >= 1 ) ? GL_TRUE : GL_FALSE; + } + + { + size_t i; + for (i = 0; i < sizeof(_glewExtensionString) / sizeof(_glewExtensionString[0]); ++i) + _glewExtensionString[i] = GL_FALSE; + } + + if (GLEW_VERSION_3_0) + { + GLint n = 0; + GLint i; + PFNGLGETINTEGERVPROC getIntegerv; + PFNGLGETSTRINGIPROC getStringi; + const char *ext; + GLboolean *enable; + + #ifdef _WIN32 + getIntegerv = glGetIntegerv; + #else + getIntegerv = (PFNGLGETINTEGERVPROC) glewGetProcAddress((const GLubyte*)"glGetIntegerv"); + #endif + + if (getIntegerv) + getIntegerv(GL_NUM_EXTENSIONS, &n); + + /* glGetStringi is OpenGL 3.0 */ + getStringi = (PFNGLGETSTRINGIPROC) glewGetProcAddress((const GLubyte*)"glGetStringi"); + if (getStringi) + for (i = 0; i<n; ++i) + { + ext = (const char *) getStringi(GL_EXTENSIONS, i); + + /* Based on extension string(s), glewGetExtension purposes */ + enable = _glewGetExtensionString(ext); + if (enable) + *enable = GL_TRUE; + + /* Based on extension string(s), experimental mode, glewIsSupported purposes */ + enable = _glewGetExtensionEnable(ext); + if (enable) + *enable = GL_TRUE; + } + } + else + { + const char *extensions; + const char *end; + const char *i; + const char *j; + char ext[128]; + GLboolean *enable; + + extensions = (const char *) getString(GL_EXTENSIONS); + + if (extensions) + { + end = extensions + _glewStrLen((const GLubyte *) extensions); + for (i=extensions; i<end; i = j + 1) + { + i = _glewNextNonSpace(i); + j = _glewNextSpace(i); + + /* Copy extension into NUL terminated string */ + if (j-i >= (ptrdiff_t) sizeof(ext)) + continue; + _glewStrCopy(ext, i, ' '); + + /* Based on extension string(s), glewGetExtension purposes */ + enable = _glewGetExtensionString(ext); + if (enable) + *enable = GL_TRUE; + + /* Based on extension string(s), experimental mode, glewIsSupported purposes */ + enable = _glewGetExtensionEnable(ext); + if (enable) + *enable = GL_TRUE; + } + } + } |