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Support loading with older functions.

This commit is contained in:
Brandon Wright 2018-05-29 16:14:16 -05:00
parent 4c40ed4ce3
commit 2b4806b9ca
1 changed files with 86 additions and 11 deletions
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97
win32/gl_core_3_1.c
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@ -3111,7 +3111,6 @@ static void ClearExtensionVars(void)
ogl_ext_EXT_texture_filter_anisotropic = ogl_LOAD_FAILED;
}
static void LoadExtByName(const char *extensionName)
{
ogl_StrToExtMap *entry = NULL;
@ -3137,6 +3136,39 @@ static void LoadExtByName(const char *extensionName)
}
}
static void ProcExtsFromExtString(const char *strExtList)
{
size_t iExtListLen = strlen(strExtList);
const char *strExtListEnd = strExtList + iExtListLen;
const char *strCurrPos = strExtList;
char strWorkBuff[256];
while(*strCurrPos)
{
/*Get the extension at our position.*/
int iStrLen = 0;
const char *strEndStr = strchr(strCurrPos, ' ');
int iStop = 0;
if(strEndStr == NULL)
{
strEndStr = strExtListEnd;
iStop = 1;
}
iStrLen = (int)((ptrdiff_t)strEndStr - (ptrdiff_t)strCurrPos);
if(iStrLen > 255)
return;
strncpy(strWorkBuff, strCurrPos, iStrLen);
strWorkBuff[iStrLen] = '\0';
LoadExtByName(strWorkBuff);
strCurrPos = strEndStr + 1;
if(iStop) break;
}
}
static void ProcExtsFromExtList(void)
{
@ -3156,12 +3188,22 @@ int ogl_LoadFunctions()
int numFailed = 0;
ClearExtensionVars();
_ptrc_glGetIntegerv = (void (CODEGEN_FUNCPTR *)(GLenum, GLint *))IntGetProcAddress("glGetIntegerv");
if(!_ptrc_glGetIntegerv) return ogl_LOAD_FAILED;
_ptrc_glGetStringi = (const GLubyte * (CODEGEN_FUNCPTR *)(GLenum, GLuint))IntGetProcAddress("glGetStringi");
if(!_ptrc_glGetStringi) return ogl_LOAD_FAILED;
ProcExtsFromExtList();
if (ogl_GetMajorVersion() < 3)
{
_ptrc_glGetString = (const GLubyte * (CODEGEN_FUNCPTR *)(GLenum))IntGetProcAddress("glGetString");
if(!_ptrc_glGetString) return ogl_LOAD_FAILED;
ProcExtsFromExtString((const char *)_ptrc_glGetString(GL_EXTENSIONS));
}
else
{
_ptrc_glGetIntegerv = (void (CODEGEN_FUNCPTR *)(GLenum, GLint *))IntGetProcAddress("glGetIntegerv");
if(!_ptrc_glGetIntegerv) return ogl_LOAD_FAILED;
_ptrc_glGetStringi = (const GLubyte * (CODEGEN_FUNCPTR *)(GLenum, GLuint))IntGetProcAddress("glGetStringi");
if(!_ptrc_glGetStringi) return ogl_LOAD_FAILED;
ProcExtsFromExtList();
}
numFailed = Load_Version_3_1();
if(numFailed == 0)
@ -3173,10 +3215,44 @@ int ogl_LoadFunctions()
static int g_major_version = 0;
static int g_minor_version = 0;
static void ParseVersionFromString(int *pOutMajor, int *pOutMinor, const char *strVersion)
{
const char *strDotPos = NULL;
int iLength = 0;
char strWorkBuff[10];
*pOutMinor = 0;
*pOutMajor = 0;
strDotPos = strchr(strVersion, '.');
if(!strDotPos)
return;
iLength = (int)((ptrdiff_t)strDotPos - (ptrdiff_t)strVersion);
strncpy(strWorkBuff, strVersion, iLength);
strWorkBuff[iLength] = '\0';
*pOutMajor = atoi(strWorkBuff);
strDotPos = strchr(strVersion + iLength + 1, ' ');
if(!strDotPos)
{
/*No extra data. Take the whole rest of the string.*/
strcpy(strWorkBuff, strVersion + iLength + 1);
}
else
{
/*Copy only up until the space.*/
int iLengthMinor = (int)((ptrdiff_t)strDotPos - (ptrdiff_t)strVersion);
iLengthMinor = iLengthMinor - (iLength + 1);
strncpy(strWorkBuff, strVersion + iLength + 1, iLengthMinor);
strWorkBuff[iLengthMinor] = '\0';
}
*pOutMinor = atoi(strWorkBuff);
}
static void GetGLVersion(void)
{
glGetIntegerv(GL_MAJOR_VERSION, &g_major_version);
glGetIntegerv(GL_MINOR_VERSION, &g_minor_version);
ParseVersionFromString(&g_major_version, &g_minor_version, (const char*)glGetString(GL_VERSION));
}
int ogl_GetMajorVersion(void)
@ -3197,10 +3273,9 @@ int ogl_IsVersionGEQ(int majorVersion, int minorVersion)
{
if(g_major_version == 0)
GetGLVersion();
if(majorVersion < g_major_version) return 1;
if(majorVersion > g_major_version) return 0;
if(minorVersion <= g_minor_version) return 1;
return 0;
}