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Connect non-base OpenGL function by calling wglGetProcAddress() on Windows

Browse source 
This is necessary since non-base OpenGL functions can't be connected by
calling the standard GetProcAddress() on Windows. To archive this the
old qwglGetProcAdress() is renamed into GetProcAdressGL() and a new
function pointer qwglGetProcAdress is introduced. On unixoid System it's
NULL and on Windows connected to wglGetProcAddress(). If it's NULL the
system wide function is called, if not the function Pointer is used.
This commit is contained in:
Yamagi Burmeister 2012-08-03 13:59:17 +02:00
parent 739590e639
commit 602dd1af6f
3 changed files with 36 additions and 19 deletions
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4
src/backends/generic/header/qgl.h
View file

@ -494,7 +494,9 @@ extern void (APIENTRY *qglSelectTextureSGIS)(GLenum);
extern void (APIENTRY *qglActiveTextureARB)(GLenum);
extern void (APIENTRY *qglClientActiveTextureARB)(GLenum);
extern void *qwglGetProcAddress(char *symbol);
extern void *GetProcAddressGL(char *symbol);
extern void *(APIENTRY *qwglGetProcAddress)(char *symbol);
#ifdef _WIN32

27
src/backends/generic/qgl.c
View file

@ -35,6 +35,8 @@
#include "../../refresh/header/local.h"
#include "header/glwindow.h"
void *(APIENTRY *qwglGetProcAddress)(char *symbol);
void (APIENTRY *qglAccum)(GLenum op, GLfloat value);
void (APIENTRY *qglAlphaFunc)(GLenum func, GLclampf ref);
GLboolean (APIENTRY *qglAreTexturesResident)(GLsizei n, const GLuint *textures,
@ -3274,6 +3276,8 @@ QGL_Shutdown(void)
glw_state.OpenGLLib = NULL;
qwglGetProcAddress = NULL;
qglAccum = NULL;
qglAlphaFunc = NULL;
qglAreTexturesResident = NULL;
@ -3612,15 +3616,27 @@ QGL_Shutdown(void)
qglViewport = NULL;
}
/*
* Special case function to return addresses of non
* base functions in libGL. The system wide function
* can't be used since on Windows wglGetProcAddress
* is required instead of GetProcAddress().
*/
void *
qwglGetProcAddress(char *symbol)
GetProcAddressGL(char *symbol)
{
if (glw_state.OpenGLLib)
if (qwglGetProcAddress)
{
return qwglGetProcAddress(symbol);
}
else if (glw_state.OpenGLLib)
{
return ri.Sys_GetProcAddress(glw_state.OpenGLLib, symbol);
}
return NULL;
else
{
return NULL;
}
}
/*
@ -4014,6 +4030,9 @@ QGL_Init(const char *dllname)
qglVertexPointer = dllVertexPointer = ri.Sys_GetProcAddress(glw_state.OpenGLLib, "glVertexPointer");
qglViewport = dllViewport = ri.Sys_GetProcAddress(glw_state.OpenGLLib, "glViewport");
/* Connect wglGetProcAddress (only available on Windows, otherwise NULL */
qwglGetProcAddress = ri.Sys_GetProcAddress(glw_state.OpenGLLib, "wglGetProcAddress");
qglLockArraysEXT = 0;
qglUnlockArraysEXT = 0;
qglPointParameterfEXT = 0;

24
src/refresh/r_main.c
View file

@ -1188,8 +1188,8 @@ R_Init(void *hinstance, void *hWnd)
strstr(gl_config.extensions_string, "GL_SGI_compiled_vertex_array"))
{
ri.Con_Printf(PRINT_ALL, "...enabling GL_EXT_compiled_vertex_array\n");
qglLockArraysEXT = (void *)qwglGetProcAddress("glLockArraysEXT");
qglUnlockArraysEXT = (void *)qwglGetProcAddress("glUnlockArraysEXT");
qglLockArraysEXT = (void *)GetProcAddressGL("glLockArraysEXT");
qglUnlockArraysEXT = (void *)GetProcAddressGL("glUnlockArraysEXT");
}
else
{
@ -1201,9 +1201,9 @@ R_Init(void *hinstance, void *hWnd)
if (gl_ext_pointparameters->value)
{
qglPointParameterfEXT = (void (APIENTRY *)(GLenum, GLfloat))
qwglGetProcAddress("glPointParameterfEXT");
GetProcAddressGL("glPointParameterfEXT");
qglPointParameterfvEXT = (void (APIENTRY *)(GLenum, const GLfloat *))
qwglGetProcAddress("glPointParameterfvEXT");
GetProcAddressGL("glPointParameterfvEXT");
ri.Con_Printf(PRINT_ALL, "...using GL_EXT_point_parameters\n");
}
else
@ -1225,7 +1225,7 @@ R_Init(void *hinstance, void *hWnd)
ri.Con_Printf(PRINT_ALL, "...using GL_EXT_shared_texture_palette\n");
qglColorTableEXT =
(void (APIENTRY *)(GLenum, GLenum, GLsizei, GLenum, GLenum,
const GLvoid *))qwglGetProcAddress(
const GLvoid *))GetProcAddressGL(
"glColorTableEXT");
}
else
@ -1244,12 +1244,9 @@ R_Init(void *hinstance, void *hWnd)
if (gl_ext_multitexture->value)
{
ri.Con_Printf(PRINT_ALL, "...using GL_ARB_multitexture\n");
qglMTexCoord2fSGIS = (void *)qwglGetProcAddress(
"glMultiTexCoord2fARB");
qglActiveTextureARB = (void *)qwglGetProcAddress(
"glActiveTextureARB");
qglClientActiveTextureARB = (void *)qwglGetProcAddress(
"glClientActiveTextureARB");
qglMTexCoord2fSGIS = (void *)GetProcAddressGL("glMultiTexCoord2fARB");
qglActiveTextureARB = (void *)GetProcAddressGL("glActiveTextureARB");
qglClientActiveTextureARB = (void *)GetProcAddressGL("glClientActiveTextureARB");
QGL_TEXTURE0 = GL_TEXTURE0_ARB;
QGL_TEXTURE1 = GL_TEXTURE1_ARB;
}
@ -1273,9 +1270,8 @@ R_Init(void *hinstance, void *hWnd)
else if (gl_ext_multitexture->value)
{
ri.Con_Printf(PRINT_ALL, "...using GL_SGIS_multitexture\n");
qglMTexCoord2fSGIS = (void *)qwglGetProcAddress("glMTexCoord2fSGIS");
qglSelectTextureSGIS = (void *)qwglGetProcAddress(
"glSelectTextureSGIS");
qglMTexCoord2fSGIS = (void *)GetProcAddressGL("glMTexCoord2fSGIS");
qglSelectTextureSGIS = (void *)GetProcAddressGL("glSelectTextureSGIS");
QGL_TEXTURE0 = GL_TEXTURE0_SGIS;
QGL_TEXTURE1 = GL_TEXTURE1_SGIS;
}