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Patched GLEW to get the extensions with OpenGL >= 3.2 for the case that glGetString(GL_EXTENSIONS) fails

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This commit is contained in:
Robert Beckebans 2014-05-11 12:19:10 +02:00
parent f72d98a1eb
commit 5c0fedf190
3 changed files with 85 additions and 15 deletions
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72
neo/libs/glew/src/glew.c
View file

@ -9468,13 +9468,73 @@ static GLboolean _glewInit_GL_WIN_swap_hint (GLEW_CONTEXT_ARG_DEF_INIT)
/* ------------------------------------------------------------------------- */
// RB: use this instead of glGetString(GL_EXTENSIONS) for OpenGL >= 3.0
static const GLubyte* _glewGetExtensions(void) {
static int s_init = 0;
static GLubyte s_array[16384];
static const GLubyte* s_ret = 0;
if (s_init == 0) {
PFNGLGETSTRINGIPROC localGetStringi = 0;
s_init = 1;
localGetStringi = (PFNGLGETSTRINGIPROC)glewGetProcAddress((const GLubyte*)"glGetStringi");
if (localGetStringi) {
GLint num_extensions = 0;
GLint extension_idx = 0;
GLuint arr_idx = 0;
glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions);
for ( ; extension_idx < num_extensions; ++extension_idx) {
const GLubyte* extension = localGetStringi(GL_EXTENSIONS, extension_idx);
if (!extension) {
return 0;
}
while (arr_idx < sizeof(s_array) && *extension != '\0') {
s_array[arr_idx++] = *extension++;
}
if (arr_idx < sizeof(s_array)) {
s_array[arr_idx++] = ' ';
}
}
if (arr_idx < sizeof(s_array)) {
s_array[arr_idx++] = '\0';
s_ret = s_array;
}
} else {
s_ret = glGetString(GL_EXTENSIONS);
}
}
return s_ret;
}
// RB end
GLboolean GLEWAPIENTRY glewGetExtension (const char* name)
{
const GLubyte* start;
const GLubyte* end;
start = (const GLubyte*)glGetString(GL_EXTENSIONS);
// RB begin
if( start == 0 )
{
// clear previously generated error
glGetError();
start = _glewGetExtensions();
if( start == 0 )
{
return GL_FALSE;
}
}
// RB end
end = start + _glewStrLen(start);
return _glewSearchExtension(name, start, end);
}
@ -9532,9 +9592,21 @@ GLenum GLEWAPIENTRY glewContextInit (GLEW_CONTEXT_ARG_DEF_LIST)
}
/* query opengl extensions string */
// RB begin
extStart = glGetString(GL_EXTENSIONS);
if( extStart == 0 )
{
// clear previously generated error
glGetError();
extStart = _glewGetExtensions();
if( extStart == 0 )
{
extStart = (const GLubyte*)"";
}
}
// RB end
extEnd = extStart + _glewStrLen(extStart);
/* initialize extensions */

2
neo/renderer/RenderSystem_init.cpp
View file

@ -328,7 +328,7 @@ static void R_CheckPortableExtensions()
}
// RB: Mesa support
//if( idStr::Icmpn( glConfig.renderer_string, "Mesa", 4 ) == 0 || idStr::Icmpn( glConfig.renderer_string, "X.org", 4 ) == 0 )
if( idStr::Icmpn( glConfig.renderer_string, "Mesa", 4 ) == 0 || idStr::Icmpn( glConfig.renderer_string, "X.org", 4 ) == 0 )
{
glConfig.driverType = GLDRV_OPENGL_MESA;
}

4
neo/sys/win32/win_glimp.cpp
View file

@ -1352,8 +1352,7 @@ bool GLimp_Init( glimpParms_t parms )
glConfig.physicalScreenWidthInCentimeters = 0.1f * mmWide;
}
// RB begin
/*
// RB: we probably have a new OpenGL 3.2 core context so reinitialize GLEW
GLenum glewResult = glewInit();
if( GLEW_OK != glewResult )
{
@ -1364,7 +1363,6 @@ bool GLimp_Init( glimpParms_t parms )
{
common->Printf( "Using GLEW %s\n", glewGetString( GLEW_VERSION ) );
}
*/
// RB end
// wglSwapinterval, etc