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Date: Sun, 22 Mar 2009 12:52:29 +0000 From: Luke Benstead Subject: OpenGL 3.0 Context Creation I've attached a patch which implements OpenGL 3.x context creation on the latest SVN. I've added two options to SDL_GL_SetAttribute, these are SDL_GL_CONTEXT_MAJOR_VERSION and SDL_GL_CONTEXT_MINOR_VERSION. These default to 2 and 1 respectively. If the major version is less than 3 then the current context creation method is used, otherwise the appropriate new context creation function is called (depending on the platform). Sample code: if (SDL_Init(SDL_INIT_VIDEO) != 0) { printf("Unable to initialize SDL: %s\n", SDL_GetError()); return 1; } SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3); //Without these 2 lines, SDL will create a GL 2.x context SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0); SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1); SDL_Surface* screen = SDL_SetVideoMode( 640, 480, 16, SDL_OPENGL | SDL_FULLSCREEN ); I've implemented context creation on both Win32 and X and run basic tests on both. This patch doesn't provide access to all the options allowed by the new context creation (e.g. shared contexts, forward compatible contexts) but they can be added pretty easily.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 24 Mar 2009 10:43:53 +0000
parents 99210400e8b9
children 4d46850be3f6
line wrap: on
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/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

/*
    MMX assembler version of SDL_MixAudio for signed little endian 16 bit samples and signed 8 bit samples
    Copyright 2002 Stephane Marchesin (stephane.marchesin@wanadoo.fr)
    This code is licensed under the LGPL (see COPYING for details)
 
    Assumes buffer size in bytes is a multiple of 16
    Assumes SDL_MIX_MAXVOLUME = 128
*/


/***********************************************
*   Mixing for 16 bit signed buffers
***********************************************/

#if defined(__GNUC__) && defined(__i386__) && defined(SDL_ASSEMBLY_ROUTINES)
void
SDL_MixAudio_MMX_S16(char *dst, char *src, unsigned int size, int volume)
{
    __asm__ __volatile__("	movl %3,%%eax\n"        /* eax = volume */
                         "	movl %2,%%edx\n"        /* edx = size */
                         "	shrl $4,%%edx\n"        /* process 16 bytes per iteration = 8 samples */
                         "	jz .endS16\n" "	pxor %%mm0,%%mm0\n" "	movd %%eax,%%mm0\n" "	movq %%mm0,%%mm1\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n"      /* mm0 = vol|vol|vol|vol */
                         ".align 8\n" "	.mixloopS16:\n" "	movq (%1),%%mm1\n"      /* mm1 = a|b|c|d */
                         "	movq %%mm1,%%mm2\n"     /* mm2 = a|b|c|d */
                         "	movq 8(%1),%%mm4\n"     /* mm4 = e|f|g|h */
                         /* pré charger le buffer dst dans mm7 */
                         "	movq (%0),%%mm7\n"      /* mm7 = dst[0] */
                         /* multiplier par le volume */
                         "	pmullw %%mm0,%%mm1\n"   /* mm1 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
                         "	pmulhw %%mm0,%%mm2\n"   /* mm2 = h(a*v)|h(b*v)|h(c*v)|h(d*v) */
                         "	movq %%mm4,%%mm5\n"     /* mm5 = e|f|g|h */
                         "	pmullw %%mm0,%%mm4\n"   /* mm4 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
                         "	pmulhw %%mm0,%%mm5\n"   /* mm5 = h(e*v)|h(f*v)|h(g*v)|h(h*v) */
                         "	movq %%mm1,%%mm3\n"     /* mm3 = l(a*v)|l(b*v)|l(c*v)|l(d*v) */
                         "	punpckhwd %%mm2,%%mm1\n"        /* mm1 = a*v|b*v */
                         "	movq %%mm4,%%mm6\n"     /* mm6 = l(e*v)|l(f*v)|l(g*v)|l(h*v) */
                         "	punpcklwd %%mm2,%%mm3\n"        /* mm3 = c*v|d*v */
                         "	punpckhwd %%mm5,%%mm4\n"        /* mm4 = e*f|f*v */
                         "	punpcklwd %%mm5,%%mm6\n"        /* mm6 = g*v|h*v */
                         /* pré charger le buffer dst dans mm5 */
                         "	movq 8(%0),%%mm5\n"     /* mm5 = dst[1] */
                         /* diviser par 128 */
                         "	psrad $7,%%mm1\n"       /* mm1 = a*v/128|b*v/128 , 128 = SDL_MIX_MAXVOLUME */
                         "	add $16,%1\n" "	psrad $7,%%mm3\n"       /* mm3 = c*v/128|d*v/128 */
                         "	psrad $7,%%mm4\n"       /* mm4 = e*v/128|f*v/128 */
                         /* mm1 = le sample avec le volume modifié */
                         "	packssdw %%mm1,%%mm3\n" /* mm3 = s(a*v|b*v|c*v|d*v) */
                         "	psrad $7,%%mm6\n"       /* mm6= g*v/128|h*v/128 */
                         "	paddsw %%mm7,%%mm3\n"   /* mm3 = adjust_volume(src)+dst */
                         /* mm4 = le sample avec le volume modifié */
                         "	packssdw %%mm4,%%mm6\n" /* mm6 = s(e*v|f*v|g*v|h*v) */
                         "	movq %%mm3,(%0)\n" "	paddsw %%mm5,%%mm6\n"   /* mm6 = adjust_volume(src)+dst */
                         "	movq %%mm6,8(%0)\n"
                         "	add $16,%0\n"
                         "	dec %%edx\n"
                         "	jnz .mixloopS16\n"
                         "	emms\n"
                         ".endS16:\n"::"r"(dst), "r"(src),
                         "m"(size), "m"(volume):"eax", "edx", "memory");
}



/*////////////////////////////////////////////// */
/* Mixing for 8 bit signed buffers */
/*////////////////////////////////////////////// */

void
SDL_MixAudio_MMX_S8(char *dst, char *src, unsigned int size, int volume)
{
    __asm__ __volatile__("	movl %3,%%eax\n"        /* eax = volume */
                         "	movd %%eax,%%mm0\n" "	movq %%mm0,%%mm1\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	psllq $16,%%mm0\n" "	por %%mm1,%%mm0\n" "	movl %2,%%edx\n"        /* edx = size */
                         "	shr $3,%%edx\n" /* process 8 bytes per iteration = 8 samples */
                         "	cmp $0,%%edx\n" "	je .endS8\n" ".align 8\n" "	.mixloopS8:\n" "	pxor %%mm2,%%mm2\n"     /* mm2 = 0 */
                         "	movq (%1),%%mm1\n"      /* mm1 = a|b|c|d|e|f|g|h */
                         "	movq %%mm1,%%mm3\n"     /* mm3 = a|b|c|d|e|f|g|h */
                         /* on va faire le "sign extension" en faisant un cmp avec 0 qui retourne 1 si <0, 0 si >0 */
                         "	pcmpgtb %%mm1,%%mm2\n"  /* mm2 = 11111111|00000000|00000000.... */
                         "	punpckhbw %%mm2,%%mm1\n"        /* mm1 = 0|a|0|b|0|c|0|d */
                         "	punpcklbw %%mm2,%%mm3\n"        /* mm3 = 0|e|0|f|0|g|0|h */
                         "	movq (%0),%%mm2\n"      /* mm2 = destination */
                         "	pmullw %%mm0,%%mm1\n"   /* mm1 = v*a|v*b|v*c|v*d */
                         "	add $8,%1\n" "	pmullw %%mm0,%%mm3\n"   /* mm3 = v*e|v*f|v*g|v*h */
                         "	psraw $7,%%mm1\n"       /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128  */
                         "	psraw $7,%%mm3\n"       /* mm3 = v*e/128|v*f/128|v*g/128|v*h/128 */
                         "	packsswb %%mm1,%%mm3\n" /* mm1 = v*a/128|v*b/128|v*c/128|v*d/128|v*e/128|v*f/128|v*g/128|v*h/128 */
                         "	paddsb %%mm2,%%mm3\n"   /* add to destination buffer */
                         "	movq %%mm3,(%0)\n"      /* store back to ram */
                         "	add $8,%0\n"
                         "	dec %%edx\n"
                         "	jnz .mixloopS8\n"
                         ".endS8:\n"
                         "	emms\n"::"r"(dst), "r"(src), "m"(size),
                         "m"(volume):"eax", "edx", "memory");
}
#endif
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