Mercurial > sdl-ios-xcode
annotate docs/man3/SDL_GL_GetProcAddress.3 @ 2328:91e601d9df8b
re: bug#563. checking in some commented out trace code and a fix so that the in testalpha.c the background only flashes when alpha == 255. The problem that is being
fixed is caused by clearing SDL_COPY_RLE_COLORKEY without setting SDL_COPY_RLE_DESIRED in SDL_UnRELSurface.
| author | Bob Pendleton <bob@pendleton.com> |
|---|---|
| date | Fri, 14 Mar 2008 18:17:49 +0000 |
| parents | 546f7c1eb755 |
| children | 1238da4a7112 |
| rev | line source |
|---|---|
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181
e5bc29de3f0a
Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
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1 .TH "SDL_GL_GetProcAddress" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference" |
| 0 | 2 .SH "NAME" |
|
2283
546f7c1eb755
Merged revision 3472 from SDL 1.2, fixing bug #493
Sam Lantinga <slouken@libsdl.org>
parents:
181
diff
changeset
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3 SDL_GL_GetProcAddress \- Get the address of a GL function |
| 0 | 4 .SH "SYNOPSIS" |
| 5 .PP | |
| 6 \fB#include "SDL\&.h" | |
| 7 .sp | |
| 8 \fBvoid *\fBSDL_GL_GetProcAddress\fP\fR(\fBconst char* proc\fR); | |
| 9 .SH "DESCRIPTION" | |
| 10 .PP | |
| 11 Returns the address of the GL function \fBproc\fR, or \fBNULL\fR if the function is not found\&. If the GL library is loaded at runtime, with \fI\fBSDL_GL_LoadLibrary\fP\fR, then \fIall\fP GL functions must be retrieved this way\&. Usually this is used to retrieve function pointers to OpenGL extensions\&. | |
| 12 .SH "EXAMPLE" | |
| 13 .PP | |
| 14 .nf | |
| 15 \f(CWtypedef void (*GL_ActiveTextureARB_Func)(unsigned int); | |
| 16 GL_ActiveTextureARB_Func glActiveTextureARB_ptr = 0; | |
| 17 int has_multitexture=1; | |
| 18 \&. | |
| 19 \&. | |
| 20 \&. | |
| 21 /* Get function pointer */ | |
| 22 glActiveTextureARB_ptr=(GL_ActiveTextureARB_Func) SDL_GL_GetProcAddress("glActiveTextureARB"); | |
| 23 | |
| 24 /* Check for a valid function ptr */ | |
| 25 if(!glActiveTextureARB_ptr){ | |
| 26 fprintf(stderr, "Multitexture Extensions not present\&. | |
| 27 "); | |
| 28 has_multitexture=0; | |
| 29 } | |
| 30 \&. | |
| 31 \&. | |
| 32 \&. | |
| 33 \&. | |
| 34 if(has_multitexture){ | |
| 35 glActiveTextureARB_ptr(GL_TEXTURE0_ARB); | |
| 36 \&. | |
| 37 \&. | |
| 38 } | |
| 39 else{ | |
| 40 \&. | |
| 41 \&. | |
| 42 }\fR | |
| 43 .fi | |
| 44 .PP | |
| 45 .SH "SEE ALSO" | |
| 46 .PP | |
| 47 \fI\fBSDL_GL_LoadLibrary\fP\fR | |
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181
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Updated from the SDL Documentation Project
Sam Lantinga <slouken@libsdl.org>
parents:
55
diff
changeset
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48 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01 |