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quakeforge/libs/video/targets/vid_3dfxsvga.c
Bill Currie 12c84046f3 [cvar] Make cvars properly typed 
This is an extremely extensive patch as it hits every cvar, and every
usage of the cvars. Cvars no longer store the value they control,
instead, they use a cexpr value object to reference the value and
specify the value's type (currently, a null type is used for strings).
Non-string cvars are passed through cexpr, allowing expressions in the
cvars' settings. Also, cvars have returned to an enhanced version of the
original (id quake) registration scheme.

As a minor benefit, relevant code having direct access to the
cvar-controlled variables is probably a slight optimization as it
removed a pointer dereference, and the variables can be located for data
locality.

The static cvar descriptors are made private as an additional safety
layer, though there's nothing stopping external modification via
Cvar_FindVar (which is needed for adding listeners).

While not used yet (partly due to working out the design), cvars can
have a validation function.

Registering a cvar allows a primary listener (and its data) to be
specified: it will always be called first when the cvar is modified. The
combination of proper listeners and direct access to the controlled
variable greatly simplifies the more complex cvar interactions as much
less null checking is required, and there's no need for one cvar's
callback to call another's.

nq-x11 is known to work at least well enough for the demos. More testing
will come.
2022-04-24 19:15:22 +09:00

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/*
vid_3dfxsvga.c
OpenGL device driver for 3Dfx chipsets running Linux
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 1999,2000 contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#ifdef HAVE_DLOPEN
# include <dlfcn.h>
#endif
#include <setjmp.h>
#include "QF/cvar.h"
#include "QF/console.h"
#include "QF/qargs.h"
#include "QF/qendian.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "QF/vid.h"
#include "QF/GL/extensions.h"
#include "QF/GL/funcs.h"
#include "QF/GL/qf_vid.h"
#include "compat.h"
#include "sbar.h"
#include "r_cvar.h"
#define WARP_WIDTH 320
#define WARP_HEIGHT 200
#define GLAPI extern
#define GLAPIENTRY
#define FXMESA_NONE 0 // to terminate attribList
#define FXMESA_DOUBLEBUFFER 10
#define FXMESA_ALPHA_SIZE 11 // followed by an integer
#define FXMESA_DEPTH_SIZE 12 // followed by an integer
#define GL_DITHER 0x0BD0
typedef struct tfxMesaContext *fxMesaContext;
#define GR_REFRESH_75Hz 0x3
#define GR_DITHER_2x2 0x1
#define GR_DITHER_4x4 0x2
#define GR_RESOLUTION_320x200 0x0
#define GR_RESOLUTION_320x240 0x1
#define GR_RESOLUTION_400x256 0x2
#define GR_RESOLUTION_512x384 0x3
#define GR_RESOLUTION_640x200 0x4
#define GR_RESOLUTION_640x350 0x5
#define GR_RESOLUTION_640x400 0x6
#define GR_RESOLUTION_640x480 0x7
#define GR_RESOLUTION_800x600 0x8
#define GR_RESOLUTION_960x720 0x9
#define GR_RESOLUTION_512x256 0xb
#define GR_RESOLUTION_856x480 0xa
#define GR_RESOLUTION_400x300 0xF
void (* qf_fxMesaDestroyContext) (fxMesaContext ctx);
void (* qf_fxMesaSwapBuffers) (void);
fxMesaContext (* qf_fxMesaCreateContext) (GLuint win, GrScreenResolution_t, GrScreenRefresh_t, const GLint attribList[]);
void (* qf_fxMesaMakeCurrent) (fxMesaContext ctx);
static fxMesaContext fc = NULL;
int VID_options_items = 0;
#if defined(HAVE_DLOPEN)
void * (* glGetProcAddress) (const char *symbol)= NULL;
void *
QFGL_GetProcAddress (void *handle, const char *name)
{
void *glfunc = NULL;
if (glGetProcAddress)
glfunc = glGetProcAddress (name);
if (!glfunc)
glfunc = dlsym (handle, name);
return glfunc;
}
void *
QFGL_LoadLibrary (void)
{
void *handle;
if (!(handle = dlopen (gl_driver, RTLD_NOW))) {
Sys_Error ("Couldn't load OpenGL library %s: %s", gl_driver,
dlerror ());
}
glGetProcAddress = dlsym (handle, "glXGetProcAddress");
if (!glGetProcAddress)
glGetProcAddress = dlsym (handle, "glXGetProcAddressARB");
return handle;
}
#else
# error "Cannot load libraries: %s was not configured with DSO support"
// the following is to avoid other compiler errors
void *
QFGL_GetProcAddress (void *handle, const char *name)
{
return 0;
}
void *
QFGL_LoadLibrary (void)
{
return 0;
}
#endif // HAVE_DLOPEN
static void
VID_shutdown (void)
{
if (!fc)
return;
qf_fxMesaDestroyContext (fc);
}
static void
GL_Init (void)
{
QF_3DfxSetDitherModeEXT dither_select = NULL;
int p;
GL_Init_Common ();
if (!(QFGL_ExtensionPresent ("3DFX_set_dither_mode")))
return;
if (!(dither_select = QFGL_ExtensionAddress ("gl3DfxSetDitherModeEXT")))
return;
Sys_MaskPrintf (SYS_vid, "Dithering: ");
if ((p = COM_CheckParm ("-dither")) && p < com_argc) {
if (strequal (com_argv[p+1], "2x2")) {
dither_select (GR_DITHER_2x2);
Sys_MaskPrintf (SYS_vid, "2x2.\n");
}
if (strequal (com_argv[p+1], "4x4")) {
dither_select (GR_DITHER_4x4);
Sys_MaskPrintf (SYS_vid, "4x4.\n");
}
} else {
qfglDisable (GL_DITHER);
Sys_MaskPrintf (SYS_vid, "disabled.\n");
}
}
VISIBLE void
GL_EndRendering (void)
{
qfglFinish ();
qf_fxMesaSwapBuffers ();
}
static unsigned int resolutions[][3] = {
{320, 200, GR_RESOLUTION_320x200},
{320, 240, GR_RESOLUTION_320x240},
{400, 256, GR_RESOLUTION_400x256},
{400, 300, GR_RESOLUTION_400x300},
{512, 256, GR_RESOLUTION_512x256},
{512, 384, GR_RESOLUTION_512x384},
{640, 200, GR_RESOLUTION_640x200},
{640, 350, GR_RESOLUTION_640x350},
{640, 400, GR_RESOLUTION_640x400},
{640, 480, GR_RESOLUTION_640x480},
{800, 600, GR_RESOLUTION_800x600},
{856, 480, GR_RESOLUTION_856x480},
{960, 720, GR_RESOLUTION_960x720},
#ifdef GR_RESOLUTION_1024x768
{1024, 768, GR_RESOLUTION_1024x768},
#endif
#ifdef GR_RESOLUTION_1152x864
{1152, 864, GR_RESOLUTION_1152x864},
#endif
#ifdef GR_RESOLUTION_1280x960
{1280, 960, GR_RESOLUTION_1280x960},
#endif
#ifdef GR_RESOLUTION_1280x1024
{1280, 1024, GR_RESOLUTION_1280x1024},
#endif
#ifdef GR_RESOLUTION_1600x1024
{1600, 1024, GR_RESOLUTION_1600x1024},
#endif
#ifdef GR_RESOLUTION_1600x1200
{1600, 1200, GR_RESOLUTION_1600x1200},
#endif
#ifdef GR_RESOLUTION_1792x1344
{1792, 1344, GR_RESOLUTION_1792x1344},
#endif
#ifdef GR_RESOLUTION_1856x1392
{1856, 1392, GR_RESOLUTION_1856x1392},
#endif
#ifdef GR_RESOLUTION_1920x1440
{1920, 1440, GR_RESOLUTION_1920x1440},
#endif
#ifdef GR_RESOLUTION_2048x1536
{2048, 1536, GR_RESOLUTION_2048x1536},
#endif
#ifdef GR_RESOLUTION_2048x2048
{2048, 2048, GR_RESOLUTION_2048x2048}
#endif
};
#define NUM_RESOLUTIONS (sizeof (resolutions) / (sizeof (int) * 3))
static int
findres (unsigned int *width, unsigned int *height)
{
unsigned int i;
for (i = 0; i < NUM_RESOLUTIONS; i++) {
if ((*width <= resolutions[i][0]) && (*height <= resolutions[i][1])) {
*width = resolutions[i][0];
*height = resolutions[i][1];
return resolutions[i][2];
}
}
*width = 640;
*height = 480;
return GR_RESOLUTION_640x480;
}
void
VID_Init (byte *palette, byte *colormap)
{
GLint attribs[32];
Sys_RegisterShutdown (VID_shutdown);
GLF_Init ();
qf_fxMesaCreateContext = QFGL_ProcAddress (libgl_handle,
"fxMesaCreateContext", true);
qf_fxMesaDestroyContext = QFGL_ProcAddress (libgl_handle,
"fxMesaDestroyContext", true);
qf_fxMesaMakeCurrent = QFGL_ProcAddress (libgl_handle,
"fxMesaMakeCurrent", true);
qf_fxMesaSwapBuffers = QFGL_ProcAddress (libgl_handle,
"fxMesaSwapBuffers", true);
VID_GetWindowSize (640, 480);
vid.maxwarpwidth = WARP_WIDTH;
vid.maxwarpheight = WARP_HEIGHT;
vid.colormap8 = vid_colormap = colormap;
vid.fullbright = 256 - vid.colormap8[256 * VID_GRADES];
// interpret command-line params
// set vid parameters
attribs[0] = FXMESA_DOUBLEBUFFER;
attribs[1] = FXMESA_ALPHA_SIZE;
attribs[2] = 1;
attribs[3] = FXMESA_DEPTH_SIZE;
attribs[4] = 1;
attribs[5] = FXMESA_NONE;
fc = qf_fxMesaCreateContext (0, findres (&vid.width, &vid.height),
GR_REFRESH_75Hz, attribs);
if (!fc)
Sys_Error ("Unable to create 3DFX context.");
qf_fxMesaMakeCurrent (fc);
vid.numpages = 2;
vid_gamma_avail = 1;
GL_Init ();
VID_InitGamma (palette);
VID_SetPalette (vid.palette);
// Check for 3DFX Extensions and initialize them.
VID_Init8bitPalette ();
vid.initialized = true;
Sys_MaskPrintf (SYS_vid, "Video mode %dx%d initialized.\n",
vid.width, vid.height);
vid.recalc_refdef = 1; // force a surface cache flush
}
void
VID_Init_Cvars (void)
{
Cvar_Register (&vid_system_gamma_cvar, 0, 0);
}
void
VID_SetCaption (const char *text)
{
}
qboolean
VID_SetGamma (double gamma)
{
return true;
}
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