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view src/hermes/HeadMMX.h @ 638:b0108e9dea53

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Date: Sun, 11 May 2003 19:59:06 +0300 From: Pasi K?rkk?inen Subject: [PATCH] fix SDL OpenGL segfault with DRI/Mesa drivers and Glew Hello! The attached patch fixes a bug in SDL which causes SDL to crash in X11_GL_Shutdown() if you are using DRI/Mesa drivers AND glew (http://glew.sf.net). The bug is caused by a namespace collision affecting dlsym() to fetch wrong pointer for glXReleaseBuffersMESA() (uninitialized pointer from glew because the extension is NOT supported by the driver) and then SDL calling it in X11_GL_Shutdown(). SDL should check if the glXReleaseBuffersMESA() is really supported by the driver (from the extensions string) before calling it. Attached patch adds extension string parsing to check if glXReleaseBuffersMESA() is really supported (and this way prevents the segfault). Availability of the extensions should be _always_ checked from the extensions string rather than using dlsym()! Please add it to the next version of SDL. Thanks to gltron and author of glew to help fixing this.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Jun 2003 17:27:33 +0000
parents 74212992fb08
children bb5ace455586
line wrap: on
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/*
   Header definitions for the MMX routines for the HERMES library
   Copyright (c) 1998 Christian Nentwich (c.nentwich@cs.ucl.ac.uk)
   This source code is licensed under the GNU LGPL
  
   Please refer to the file COPYING.LIB contained in the distribution for
   licensing conditions
*/

#ifndef __HERMES_HEAD_MMX__
#define __HERMES_HEAD_MMX__


/* If you cannot stand ifdefs, then please do not look into this file, it's
   going to end your life :) */

#ifdef X86_ASSEMBLER


#ifdef __cplusplus
extern "C" {
#endif

void STACKCALL ConvertMMX(HermesConverterInterface *);

void STACKCALL ClearMMX_32(HermesClearInterface *);
void STACKCALL ClearMMX_24(HermesClearInterface *);
void STACKCALL ClearMMX_16(HermesClearInterface *);
void STACKCALL ClearMMX_8(HermesClearInterface *);

void ConvertMMXpII32_24RGB888();
void ConvertMMXpII32_16RGB565();
void ConvertMMXpII32_16BGR565();
void ConvertMMXpII32_16RGB555();
void ConvertMMXpII32_16BGR565();
void ConvertMMXpII32_16BGR555();

void ConvertMMXp32_16RGB555();

#ifdef __cplusplus
}
#endif



/* Fix the underscore business with ELF compilers */

#if defined(__ELF__) && defined(__GNUC__)
  #ifdef __cplusplus 
  extern "C" {   
  #endif

  void ConvertMMX(HermesConverterInterface *) __attribute__ ((alias ("_ConvertMMX")));
#if 0
  void ClearMMX_32(HermesClearInterface *) __attribute__ ((alias ("_ClearMMX_32")));
  void ClearMMX_24(HermesClearInterface *)  __attribute__ ((alias ("_ClearMMX_24")));
  void ClearMMX_16(HermesClearInterface *)  __attribute__ ((alias ("_ClearMMX_16")));
  void ClearMMX_8(HermesClearInterface *)  __attribute__ ((alias ("_ClearMMX_8")));

  void ConvertMMXp32_16RGB555() __attribute__ ((alias ("_ConvertMMXp32_16RGB555")));
#endif

  void ConvertMMXpII32_24RGB888() __attribute__ ((alias ("_ConvertMMXpII32_24RGB888")));
  void ConvertMMXpII32_16RGB565() __attribute__ ((alias ("_ConvertMMXpII32_16RGB565")));
  void ConvertMMXpII32_16BGR565() __attribute__ ((alias ("_ConvertMMXpII32_16BGR565")));
  void ConvertMMXpII32_16RGB555() __attribute__ ((alias ("_ConvertMMXpII32_16RGB555")));
  void ConvertMMXpII32_16BGR555() __attribute__ ((alias ("_ConvertMMXpII32_16BGR555")));

  #ifdef __cplusplus
  }
  #endif

#endif /* ELF and GNUC */




/* Make it work with Watcom */
#ifdef __WATCOMC__
#pragma warning 601 9

#pragma aux ConvertMMX "_*" modify [EAX EBX ECX EDX ESI EDI]

#pragma aux ClearMMX_32 "_*" modify [EAX EBX ECX EDX ESI EDI]
#pragma aux ClearMMX_24 "_*" modify [EAX EBX ECX EDX ESI EDI]
#pragma aux ClearMMX_16 "_*" modify [EAX EBX ECX EDX ESI EDI]
#pragma aux ClearMMX_8 "_*" modify [EAX EBX ECX EDX ESI EDI]

#pragma aux ConvertMMXpII32_24RGB888 "_*"
#pragma aux ConvertMMXpII32_16RGB565 "_*"
#pragma aux ConvertMMXpII32_16BGR565 "_*"
#pragma aux ConvertMMXpII32_16RGB555 "_*"
#pragma aux ConvertMMXpII32_16BGR555 "_*"
#pragma aux ConvertMMXp32_16RGB555 "_*"

#endif /* WATCOM */

#endif /* X86_ASSEMBLER */


#endif