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For bug 2636621, reorganise and simplify OpenGL version string parsing. Ensure OpenGL 3.0 is properly detected.

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git-svn-id: https://glew.svn.sourceforge.net/svnroot/glew/trunk/glew@549 783a27ee-832a-0410-bc00-9f386506c6dd
This commit is contained in:
nigels 2009-03-31 21:16:33 +00:00
parent a8ddad81de
commit ceb6fe2e85
1 changed files with 23 additions and 67 deletions
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88
auto/src/glew_init_gl.c
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@ -31,80 +31,36 @@ static
GLenum glewContextInit (GLEW_CONTEXT_ARG_DEF_LIST) GLenum glewContextInit (GLEW_CONTEXT_ARG_DEF_LIST)
{ {
const GLubyte* s; const GLubyte* s;
GLuint dot, major, minor; GLuint dot;
GLint major, minor;
/* query opengl version */ /* query opengl version */
s = glGetString(GL_VERSION); s = glGetString(GL_VERSION);
dot = _glewStrCLen(s, '.'); dot = _glewStrCLen(s, '.');
major = dot-1; if (dot == 0)
minor = dot+1;
if (dot == 0 || s[minor] == '\0')
return GLEW_ERROR_NO_GL_VERSION; return GLEW_ERROR_NO_GL_VERSION;
if (s[major] == '1' && s[minor] == '0')
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; return GLEW_ERROR_GL_VERSION_10_ONLY;
} }
else else
{ {
CONST_CAST(GLEW_VERSION_1_1) = GL_TRUE; CONST_CAST(GLEW_VERSION_3_0) = ( major >= 3 ) ? GL_TRUE : GL_FALSE;
if (s[major] >= '2') CONST_CAST(GLEW_VERSION_2_1) = GLEW_VERSION_3_0 == GL_TRUE || ( major == 2 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
{ CONST_CAST(GLEW_VERSION_2_0) = GLEW_VERSION_2_1 == GL_TRUE || ( major == 2 ) ? GL_TRUE : GL_FALSE;
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE; CONST_CAST(GLEW_VERSION_1_5) = GLEW_VERSION_2_0 == GL_TRUE || ( major == 1 && minor >= 5 ) ? GL_TRUE : GL_FALSE;
CONST_CAST(GLEW_VERSION_1_3) = GL_TRUE; CONST_CAST(GLEW_VERSION_1_4) = GLEW_VERSION_1_5 == GL_TRUE || ( major == 1 && minor >= 4 ) ? GL_TRUE : GL_FALSE;
CONST_CAST(GLEW_VERSION_1_4) = GL_TRUE; CONST_CAST(GLEW_VERSION_1_3) = GLEW_VERSION_1_4 == GL_TRUE || ( major == 1 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
CONST_CAST(GLEW_VERSION_1_5) = GL_TRUE; CONST_CAST(GLEW_VERSION_1_2) = GLEW_VERSION_1_3 == GL_TRUE || ( major == 1 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
CONST_CAST(GLEW_VERSION_2_0) = GL_TRUE; CONST_CAST(GLEW_VERSION_1_1) = GLEW_VERSION_1_2 == GL_TRUE || ( major == 1 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
if (s[minor] >= '1')
{
CONST_CAST(GLEW_VERSION_2_1) = GL_TRUE;
}
}
else
{
if (s[minor] >= '5')
{
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_3) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_4) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_5) = GL_TRUE;
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
}
if (s[minor] == '4')
{
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_3) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_4) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_5) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
}
if (s[minor] == '3')
{
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_3) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_4) = GL_FALSE;
CONST_CAST(GLEW_VERSION_1_5) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
}
if (s[minor] == '2')
{
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
CONST_CAST(GLEW_VERSION_1_3) = GL_FALSE;
CONST_CAST(GLEW_VERSION_1_4) = GL_FALSE;
CONST_CAST(GLEW_VERSION_1_5) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
}
if (s[minor] < '2')
{
CONST_CAST(GLEW_VERSION_1_2) = GL_FALSE;
CONST_CAST(GLEW_VERSION_1_3) = GL_FALSE;
CONST_CAST(GLEW_VERSION_1_4) = GL_FALSE;
CONST_CAST(GLEW_VERSION_1_5) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
}
}
} }
/* initialize extensions */ /* initialize extensions */