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quakeforge/qw/source/vid_common_gl.c
Jeff Teunissen 5cd24de097 Hardware gamma support in QW. Currently, only -x11 and -glx will 
build. Look at their vid files, as well as vid_common_{gl,sw}.c to find
out what will need to be added to the rest of the video targets.
2001-04-11 07:16:34 +00:00

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/*
vid_common_gl.c
Common OpenGL video driver functions
Copyright (C) 1996-1997 Id Software, Inc.
Copyright (C) 2000 Marcus Sundberg [mackan@stacken.kth.se]
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
$Id$
*/
#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 _WIN32
// must be BEFORE include gl/gl.h
# include "winquake.h"
#endif
#include <GL/gl.h>
#include "QF/compat.h"
#include "QF/console.h"
#include "QF/input.h"
#include "QF/qargs.h"
#include "QF/quakefs.h"
#include "glquake.h"
#include "qfgl_ext.h"
#include "sbar.h"
#define WARP_WIDTH 320
#define WARP_HEIGHT 200
//unsigned short d_8to16table[256];
unsigned int d_8to24table[256];
unsigned char d_15to8table[65536];
cvar_t *vid_mode;
extern byte gammatable[256];
/*-----------------------------------------------------------------------*/
int texture_extension_number = 1;
float gldepthmin, gldepthmax;
const char *gl_vendor;
const char *gl_renderer;
const char *gl_version;
const char *gl_extensions;
// ARB Multitexture
qboolean gl_mtex_capable = false;
GLenum gl_mtex_enum = GL_TEXTURE0_ARB;
QF_glColorTableEXT qglColorTableEXT = NULL;
qboolean is8bit = false;
cvar_t *vid_use8bit;
cvar_t *vid_gamma;
extern int gl_filter_min, gl_filter_max;
extern cvar_t *vid_system_gamma;
/*-----------------------------------------------------------------------*/
/*
CheckMultiTextureExtensions
Check for ARB multitexture support
*/
void
CheckMultiTextureExtensions (void)
{
Con_Printf ("Checking for multitexture: ");
if (COM_CheckParm ("-nomtex")) {
Con_Printf ("disabled.\n");
return;
}
if (QFGL_ExtensionPresent ("GL_ARB_multitexture")) {
int max_texture_units = 0;
glGetIntegerv (GL_MAX_TEXTURE_UNITS_ARB, &max_texture_units);
if (max_texture_units >= 2) {
Con_Printf ("enabled, %d TMUs.\n", max_texture_units);
qglMultiTexCoord2f = QFGL_ExtensionAddress ("glMultiTexCoord2fARB");
qglActiveTexture = QFGL_ExtensionAddress ("glActiveTextureARB");
gl_mtex_enum = GL_TEXTURE0_ARB;
gl_mtex_capable = true;
} else {
Con_Printf ("disabled, not enough TMUs.\n");
}
} else {
Con_Printf ("not found.\n");
}
}
/*
VID_InitGamma
Initialize the gamma lookup table
This function does some nasty things to Cvars, but at least we have the
excuse that it has to.
*/
void
VID_InitGamma (unsigned char *pal)
{
int i;
double gamma;
vid_gamma = Cvar_Get ("vid_gamma", "1.45", CVAR_ARCHIVE, VID_UpdateGamma,
"Gamma correction");
if ((i = COM_CheckParm ("-gamma"))) {
gamma = atof (com_argv[i + 1]);
} else {
gamma = vid_gamma->value;
}
gamma = bound (0.1, gamma, 9.9);
Cvar_SetValue (vid_gamma, gamma);
if (gamma == 1.0) { // screw the math, 1.0 is linear
for (i = 0; i < 256; i++) {
gammatable[i] = i;
}
} else {
if (vid_system_gamma->int_val) {
VID_SetGamma (gamma);
} else {
double g = 1.0 / gamma;
int v;
Cvar_SetFlags (vid_gamma, vid_gamma->flags | CVAR_ROM);
for (i = 0; i < 256; i++) { // Create the gamma-correction table
v = (int) (255.0 * pow ((double) i / 255.0, g));
gammatable[i] = bound (0, v, 255);
}
}
}
for (i = 0; i < 768; i++) { // correct the palette
pal[i] = gammatable[pal[i]];
}
}
void
VID_SetPalette (unsigned char *palette)
{
byte *pal;
unsigned int r, g, b;
unsigned int v;
int r1, g1, b1;
int k;
unsigned short i;
unsigned int *table;
QFile *f;
char s[255];
float dist, bestdist;
static qboolean palflag = false;
//
// 8 8 8 encoding
//
// Con_Printf("Converting 8to24\n");
pal = palette;
table = d_8to24table;
for (i = 0; i < 255; i++) { // used to be i<256, see d_8to24table below
r = pal[0];
g = pal[1];
b = pal[2];
pal += 3;
#ifdef WORDS_BIGENDIAN
v = (255 << 0) + (r << 24) + (g << 16) + (b << 8);
#else
v = (255 << 24) + (r << 0) + (g << 8) + (b << 16);
#endif
*table++ = v;
}
d_8to24table[255] = 0; // 255 is transparent
// JACK: 3D distance calcs - k is last closest, l is the distance.
// FIXME: Precalculate this and cache to disk.
if (palflag)
return;
palflag = true;
COM_FOpenFile ("glquake/15to8.pal", &f);
if (f) {
Qread (f, d_15to8table, 1 << 15);
Qclose (f);
} else {
for (i = 0; i < (1 << 15); i++) {
/* Maps
000000000000000
000000000011111 = Red = 0x1F
000001111100000 = Blue = 0x03E0
111110000000000 = Grn = 0x7C00
*/
r = ((i & 0x1F) << 3) + 4;
g = ((i & 0x03E0) >> 2) + 4;
b = ((i & 0x7C00) >> 7) + 4;
pal = (unsigned char *) d_8to24table;
for (v = 0, k = 0, bestdist = 10000.0; v < 256; v++, pal += 4) {
r1 = (int) r - (int) pal[0];
g1 = (int) g - (int) pal[1];
b1 = (int) b - (int) pal[2];
dist = sqrt (((r1 * r1) + (g1 * g1) + (b1 * b1)));
if (dist < bestdist) {
k = v;
bestdist = dist;
}
}
d_15to8table[i] = k;
}
snprintf (s, sizeof (s), "%s/glquake/15to8.pal", com_gamedir);
COM_CreatePath (s);
if ((f = Qopen (s, "wb")) != NULL) {
Qwrite (f, d_15to8table, 1 << 15);
Qclose (f);
}
}
}
/*
GL_Init_Common
*/
void
GL_Init_Common (void)
{
gl_vendor = glGetString (GL_VENDOR);
Con_Printf ("GL_VENDOR: %s\n", gl_vendor);
gl_renderer = glGetString (GL_RENDERER);
Con_Printf ("GL_RENDERER: %s\n", gl_renderer);
gl_version = glGetString (GL_VERSION);
Con_Printf ("GL_VERSION: %s\n", gl_version);
gl_extensions = glGetString (GL_EXTENSIONS);
Con_Printf ("GL_EXTENSIONS: %s\n", gl_extensions);
glClearColor (0, 0, 0, 0);
glCullFace (GL_FRONT);
glEnable (GL_TEXTURE_2D);
glEnable (GL_ALPHA_TEST);
glAlphaFunc (GL_GREATER, 0.666);
glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
glShadeModel (GL_FLAT);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glEnable (GL_BLEND);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
CheckMultiTextureExtensions ();
}
/*
GL_BeginRendering
*/
void
GL_BeginRendering (int *x, int *y, int *width, int *height)
{
*x = *y = 0;
*width = scr_width;
*height = scr_height;
}
qboolean
VID_Is8bit (void)
{
return is8bit;
}
#ifdef GL_SHARED_TEXTURE_PALETTE_EXT
void
Tdfx_Init8bitPalette (void)
{
// Check for 8bit Extensions and initialize them.
int i;
if (is8bit) {
return;
}
if (QFGL_ExtensionPresent ("3DFX_set_global_palette")) {
char *oldpal;
GLubyte table[256][4];
QF_gl3DfxSetPaletteEXT qgl3DfxSetPaletteEXT = NULL;
if (!(qgl3DfxSetPaletteEXT = QFGL_ExtensionAddress ("gl3DfxSetPaletteEXT"))) {
Con_Printf ("3DFX_set_global_palette not found.\n");
return;
}
Con_Printf ("3DFX_set_global_palette.\n");
oldpal = (char *) d_8to24table; // d_8to24table3dfx;
for (i = 0; i < 256; i++) {
table[i][2] = *oldpal++;
table[i][1] = *oldpal++;
table[i][0] = *oldpal++;
table[i][3] = 255;
oldpal++;
}
glEnable (GL_SHARED_TEXTURE_PALETTE_EXT);
qgl3DfxSetPaletteEXT ((GLuint *) table);
is8bit = true;
} else {
Con_Printf ("\n 3DFX_set_global_palette not found.");
}
}
/*
* The GL_EXT_shared_texture_palette seems like an idea which is
* /almost/ a good idea, but seems to be severely broken with many
* drivers, as such it is disabled.
*
* It should be noted, that a palette object extension as suggested by
* the GL_EXT_shared_texture_palette spec might be a very good idea in
* general.
*/
void
Shared_Init8bitPalette (void)
{
int i;
GLubyte thePalette[256 * 3];
GLubyte *oldPalette, *newPalette;
if (is8bit) {
return;
}
if (QFGL_ExtensionPresent ("GL_EXT_shared_texture_palette")) {
if (!(qglColorTableEXT = QFGL_ExtensionAddress ("glColorTableEXT"))) {
Con_Printf ("glColorTableEXT not found.\n");
return;
}
Con_Printf ("GL_EXT_shared_texture_palette\n");
glEnable (GL_SHARED_TEXTURE_PALETTE_EXT);
oldPalette = (GLubyte *) d_8to24table; // d_8to24table3dfx;
newPalette = thePalette;
for (i = 0; i < 256; i++) {
*newPalette++ = *oldPalette++;
*newPalette++ = *oldPalette++;
*newPalette++ = *oldPalette++;
oldPalette++;
}
qglColorTableEXT (GL_SHARED_TEXTURE_PALETTE_EXT, GL_RGB, 256, GL_RGB,
GL_UNSIGNED_BYTE, (GLvoid *) thePalette);
is8bit = true;
} else {
Con_Printf ("\n GL_EXT_shared_texture_palette not found.");
}
}
#endif
void
VID_Init8bitPalette (void)
{
vid_use8bit = Cvar_Get ("vid_use8bit", "0", CVAR_ROM, NULL,
"Use 8-bit shared palettes.");
Con_Printf ("Checking for 8-bit extension: ");
if (vid_use8bit->int_val) {
#ifdef GL_SHARED_TEXTURE_PALETTE_EXT
Tdfx_Init8bitPalette ();
Shared_Init8bitPalette ();
#endif
if (!is8bit) {
Con_Printf ("\n 8-bit extension not found.\n");
}
} else {
Con_Printf ("disabled.\n");
}
}
void
VID_LockBuffer (void)
{
}
void
VID_UnlockBuffer (void)
{
}
void
D_BeginDirectRect (int x, int y, byte *pbitmap, int width, int height)
{
}
void
D_EndDirectRect (int x, int y, int width, int height)
{
}
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