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quakeforge/libs/video/targets/vid_common_gl.c
Ragnvald Maartmann-Moe IV 9cd16b8dfd Grievre's lighting patch, plus some of my own changes. 
My changes:
Emit normals if truform is enabled.
Attempt to avoid 0,0,0 normals (makes lighting & tesselation unhappy).
Fix some (ancient) apparent bugs in GetAliasFrameVerts16().
Clamp minlight, instead of adding it.
Apply colormod as glColor, rather than adding it to emission, to prevent QSG2
 issues with fullbrights.
Rearrange init code, and don't go quite as wild with responsiveness to lights.

Material & lightmode settings will need tweaking & testing to work well on all
 cards. Feedback needed there.
2004-03-10 08:14:38 +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
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((unused)) const char rcsid[] =
"$Id$";
#ifdef HAVE_MATH_H
# include <math.h>
#endif
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "QF/console.h"
#include "QF/cvar.h"
#include "QF/input.h"
#include "QF/qargs.h"
#include "QF/quakefs.h"
#include "QF/sys.h"
#include "QF/va.h"
#include "QF/vid.h"
#include "QF/GL/defines.h"
#include "QF/GL/extensions.h"
#include "QF/GL/funcs.h"
#include "QF/GL/qf_vid.h"
#include "compat.h"
#include "d_iface.h"
#include "r_cvar.h"
#include "sbar.h"
#define WARP_WIDTH 320
#define WARP_HEIGHT 200
unsigned char d_15to8table[65536];
QF_glActiveTexture qglActiveTexture = NULL;
QF_glMultiTexCoord2f qglMultiTexCoord2f = NULL;
QF_glMultiTexCoord2fv qglMultiTexCoord2fv = NULL;
const char *gl_extensions;
const char *gl_renderer;
const char *gl_vendor;
const char *gl_version;
int gl_major;
int gl_minor;
int gl_release_number;
static int gl_bgra_capable;
int use_bgra;
int gl_va_capable;
int vaelements;
int texture_extension_number = 1;
int gl_filter_min = GL_LINEAR_MIPMAP_NEAREST;
int gl_filter_max = GL_LINEAR;
float gldepthmin, gldepthmax;
// Multitexture
qboolean gl_mtex_capable = false;
static int gl_mtex_tmus = 0;
GLenum gl_mtex_enum;
int gl_mtex_active_tmus = 0;
qboolean gl_mtex_fullbright = false;
// Combine
qboolean gl_combine_capable = false;
int lm_src_blend, lm_dest_blend;
float rgb_scale = 1.0;
QF_glColorTableEXT qglColorTableEXT = NULL;
qboolean is8bit = false;
qboolean gl_feature_mach64 = false;
// ATI PN_triangles
static qboolean TruForm;
static int tess_max;
int tess;
// GL_LIGHT
int gl_max_lights;
cvar_t *gl_doublebright;
cvar_t *gl_fb_bmodels;
cvar_t *gl_max_size;
cvar_t *gl_multitexture;
cvar_t *gl_tessellate;
cvar_t *gl_textures_bgra;
cvar_t *gl_vaelements_max;
cvar_t *gl_screenshot_byte_swap;
cvar_t *vid_mode;
cvar_t *vid_use8bit;
void gl_multitexture_f (cvar_t *var);
static void
gl_max_size_f (cvar_t *var)
{
GLint texSize;
if (!var)
return;
// Check driver's max texture size
qfglGetIntegerv (GL_MAX_TEXTURE_SIZE, &texSize);
if (var->int_val < 1) {
Cvar_SetValue (var, texSize);
} else {
Cvar_SetValue (var, bound (1, var->int_val, texSize));
}
}
static void
gl_textures_bgra_f (cvar_t *var)
{
if (!var)
return;
if (var->int_val && gl_bgra_capable) {
use_bgra = 1;
} else {
use_bgra = 0;
}
}
static void
gl_fb_bmodels_f (cvar_t *var)
{
if (!var)
return;
if (var->int_val && gl_mtex_tmus >= 3) {
gl_mtex_fullbright = true;
} else {
gl_mtex_fullbright = false;
}
}
void
gl_multitexture_f (cvar_t *var)
{
if (!var)
return;
if (var->int_val && gl_mtex_capable) {
gl_mtex_active_tmus = gl_mtex_tmus;
if (gl_fb_bmodels) {
if (gl_fb_bmodels->int_val) {
if (gl_mtex_tmus >= 3) {
gl_mtex_fullbright = true;
qglActiveTexture (gl_mtex_enum + 2);
qfglEnable (GL_TEXTURE_2D);
qfglTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,
GL_DECAL);
qfglDisable (GL_TEXTURE_2D);
} else {
gl_mtex_fullbright = false;
Con_Printf ("Not enough TMUs for BSP fullbrights.\n");
}
}
} else {
gl_mtex_fullbright = false;
}
// Lightmaps
qglActiveTexture (gl_mtex_enum + 1);
qfglEnable (GL_TEXTURE_2D);
if (gl_overbright) {
if (gl_combine_capable && gl_overbright->int_val) {
qfglTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
qfglTexEnvf (GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
qfglTexEnvf (GL_TEXTURE_ENV, GL_RGB_SCALE, rgb_scale);
} else {
qfglTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
} else {
qfglTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
qfglDisable (GL_TEXTURE_2D);
// Base Texture
qglActiveTexture (gl_mtex_enum + 0);
} else {
gl_mtex_active_tmus = 0;
gl_mtex_fullbright = false;
}
}
static void
gl_screenshot_byte_swap_f (cvar_t *var)
{
if (var)
qfglPixelStorei (GL_PACK_SWAP_BYTES,
var->int_val ? GL_TRUE : GL_FALSE);
}
static void
gl_tessellate_f (cvar_t * var)
{
if (TruForm) {
if (var)
tess = (bound (0, var->int_val, tess_max));
else
tess = 0;
qfglPNTrianglesiATI (GL_PN_TRIANGLES_TESSELATION_LEVEL_ATI, tess);
} else {
tess = 0;
if (var)
Con_Printf ("TruForm (GL_ATI_pn_triangles) is not supported by "
"your hardware and/or drivers.\n");
}
}
static void
GL_Common_Init_Cvars (void)
{
vid_use8bit = Cvar_Get ("vid_use8bit", "0", CVAR_ROM, NULL, "Use 8-bit "
"shared palettes.");
gl_textures_bgra = Cvar_Get ("gl_textures_bgra", "0", CVAR_ROM,
gl_textures_bgra_f, "If set to 1, try to use "
"BGR & BGRA textures instead of RGB & RGBA.");
gl_fb_bmodels = Cvar_Get ("gl_fb_bmodels", "1", CVAR_ARCHIVE,
gl_fb_bmodels_f, "Toggles fullbright color "
"support for bmodels");
gl_max_size = Cvar_Get ("gl_max_size", "0", CVAR_NONE, gl_max_size_f,
"Texture dimension");
gl_multitexture = Cvar_Get ("gl_multitexture", "0", CVAR_ARCHIVE,
gl_multitexture_f, "Use multitexture when "
"available.");
gl_screenshot_byte_swap =
Cvar_Get ("gl_screenshot_byte_swap", "0", CVAR_NONE,
gl_screenshot_byte_swap_f, "Swap the bytes for gl "
"screenshots. Needed if you get screenshots with red and "
"blue swapped.");
gl_tessellate =
Cvar_Get ("gl_tessellate", "0", CVAR_NONE, gl_tessellate_f,
nva ("Specifies tessellation level from 0 to %i. Higher "
"tessellation level means more triangles.", tess_max));
gl_vaelements_max = Cvar_Get ("gl_vaelements_max", "0", CVAR_ROM, NULL,
"Limit the vertex array size for buggy "
"drivers. 0 (default) uses driver provided "
"limit, -1 disables use of vertex arrays.");
}
static void
CheckGLVersionString (void)
{
gl_version = qfglGetString (GL_VERSION);
if (sscanf (gl_version, "%d.%d", &gl_major, &gl_minor) == 2) {
gl_release_number = 0;
if (gl_major >= 1) {
if (gl_minor >= 1) {
gl_va_capable = true;
} else {
gl_va_capable = false;
}
}
} else if (sscanf (gl_version, "%d.%d.%d", &gl_major, &gl_minor,
&gl_release_number) == 3) {
if (gl_major >= 1) {
if (gl_minor >= 1) {
gl_va_capable = true;
} else {
gl_va_capable = false;
}
}
} else {
Sys_Error ("Malformed OpenGL version string!");
}
Con_Printf ("GL_VERSION: %s\n", gl_version);
gl_vendor = qfglGetString (GL_VENDOR);
Con_Printf ("GL_VENDOR: %s\n", gl_vendor);
gl_renderer = qfglGetString (GL_RENDERER);
Con_Printf ("GL_RENDERER: %s\n", gl_renderer);
gl_extensions = qfglGetString (GL_EXTENSIONS);
Con_Printf ("GL_EXTENSIONS: %s\n", gl_extensions);
if (strstr (gl_renderer, "Mesa DRI Mach64"))
gl_feature_mach64 = true;
}
static void
CheckBGRAExtensions (void)
{
if (gl_major >= 1 && gl_minor >= 3) {
gl_bgra_capable = true;
} else if (QFGL_ExtensionPresent ("GL_EXT_bgra")) {
gl_bgra_capable = true;
} else {
gl_bgra_capable = false;
}
}
static void
CheckCombineExtensions (void)
{
if (gl_major >= 1 && gl_minor >= 3) {
gl_combine_capable = true;
Con_Printf ("COMBINE active, multitextured doublebright enabled.\n");
} else if (QFGL_ExtensionPresent ("GL_ARB_texture_env_combine")) {
gl_combine_capable = true;
Con_Printf ("COMBINE_ARB active, multitextured doublebright "
"enabled.\n");
} else {
gl_combine_capable = false;
Con_Printf ("GL_ARB_texture_env_combine not found. gl_doublebright "
"will have no effect with gl_multitexture on.\n");
}
}
/*
CheckMultiTextureExtensions
Check for ARB multitexture support
*/
static void
CheckMultiTextureExtensions (void)
{
Con_Printf ("Checking for multitexture: ");
if (COM_CheckParm ("-nomtex")) {
Con_Printf ("disabled.\n");
return;
}
if (gl_major >= 1 && gl_minor >= 3) {
qfglGetIntegerv (GL_MAX_TEXTURE_UNITS, &gl_mtex_tmus);
if (gl_mtex_tmus >= 2) {
Con_Printf ("enabled, %d TMUs.\n", gl_mtex_tmus);
qglMultiTexCoord2f =
QFGL_ExtensionAddress ("glMultiTexCoord2f");
qglMultiTexCoord2fv =
QFGL_ExtensionAddress ("glMultiTexCoord2fv");
qglActiveTexture = QFGL_ExtensionAddress ("glActiveTexture");
gl_mtex_enum = GL_TEXTURE0;
if (qglMultiTexCoord2f && gl_mtex_enum)
gl_mtex_capable = true;
else
Con_Printf ("Multitexture disabled, could not find required "
"functions\n");
} else {
Con_Printf ("Multitexture disabled, not enough TMUs.\n");
}
} else if (QFGL_ExtensionPresent ("GL_ARB_multitexture")) {
qfglGetIntegerv (GL_MAX_TEXTURE_UNITS_ARB, &gl_mtex_tmus);
if (gl_mtex_tmus >= 2) {
Con_Printf ("enabled, %d TMUs.\n", gl_mtex_tmus);
qglMultiTexCoord2f =
QFGL_ExtensionAddress ("glMultiTexCoord2fARB");
qglMultiTexCoord2fv =
QFGL_ExtensionAddress ("glMultiTexCoord2fvARB");
qglActiveTexture = QFGL_ExtensionAddress ("glActiveTextureARB");
gl_mtex_enum = GL_TEXTURE0_ARB;
if (qglMultiTexCoord2f && gl_mtex_enum)
gl_mtex_capable = true;
else
Con_Printf ("Multitexture disabled, could not find required "
"functions\n");
} else {
Con_Printf ("Multitexture disabled, not enough TMUs.\n");
}
} else {
Con_Printf ("not found.\n");
}
}
static void
CheckTruFormExtensions (void)
{
if (QFGL_ExtensionPresent ("GL_ATI_pn_triangles")) {
TruForm = true;
qfglGetIntegerv (GL_MAX_PN_TRIANGLES_TESSELATION_LEVEL_ATI,
&tess_max);
qfglPNTrianglesiATI (GL_PN_TRIANGLES_NORMAL_MODE_ATI,
GL_PN_TRIANGLES_NORMAL_MODE_QUADRATIC_ATI);
qfglPNTrianglesiATI (GL_PN_TRIANGLES_POINT_MODE_ATI,
GL_PN_TRIANGLES_POINT_MODE_CUBIC_ATI);
} else {
TruForm = false;
tess = 0;
tess_max = 0;
}
}
static void
CheckVertexArraySize (void)
{
qfglGetIntegerv (GL_MAX_ELEMENTS_VERTICES, &vaelements);
if (vaelements > 65536)
vaelements = 65536;
if (gl_vaelements_max->int_val)
vaelements = min (gl_vaelements_max->int_val, vaelements);
// qfglGetIntegerv (MAX_ELEMENTS_INDICES, *vaindices);
}
static void
CheckLights (void)
{
float dark[4] = {0.0, 0.0, 0.0, 1.0},
// light[4] = {1.0, 1.0, 1.0, 1.0},
specular[4] = {0.6, 0.6, 0.6, 1.0};
qfglGetIntegerv (GL_MAX_LIGHTS, &gl_max_lights);
Con_Printf ("Max GL Lights %lu.\n", (long unsigned) gl_max_lights);
qfglEnable (GL_LIGHTING);
qfglLightModelfv (GL_LIGHT_MODEL_AMBIENT, dark);
qfglLightModelf (GL_LIGHT_MODEL_TWO_SIDE, 0.0);
// Set up material defaults
qfglMaterialf (GL_FRONT, GL_SHININESS, 1.0);
// qfglMaterialfv (GL_FRONT, GL_AMBIENT_AND_DIFFUSE, light);
qfglMaterialfv (GL_FRONT, GL_SPECULAR, specular);
qfglDisable (GL_LIGHTING);
}
void
VID_SetPalette (unsigned char *palette)
{
byte *pal;
char s[255];
float dist, bestdist;
int r1, g1, b1, k;
unsigned int r, g, b, v;
unsigned short i;
unsigned int *table;
static qboolean palflag = false;
QFile *f;
// 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.
if (palflag)
return;
palflag = true;
QFS_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 = 0x001F
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", qfs_gamedir->dir.def);
if ((f = QFS_WOpen (s, 0)) != NULL) {
Qwrite (f, d_15to8table, 1 << 15);
Qclose (f);
}
}
}
void
GL_Init_Common (void)
{
GLF_FindFunctions ();
CheckGLVersionString ();
qfglClearColor (0, 0, 0, 0);
qfglEnable (GL_TEXTURE_2D);
qfglCullFace (GL_FRONT);
qfglPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
qfglShadeModel (GL_FLAT);
qfglEnable (GL_BLEND);
qfglBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
qfglTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
qfglTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl_filter_min);
qfglTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl_filter_max);
qfglTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
qfglTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
CheckMultiTextureExtensions ();
CheckCombineExtensions ();
CheckBGRAExtensions ();
CheckTruFormExtensions ();
GL_Common_Init_Cvars ();
CheckVertexArraySize ();
CheckLights ();
}
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;
}
static 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++;
}
qfglEnable (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.
*/
static 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");
qfglEnable (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.");
}
}
void
VID_Init8bitPalette (void)
{
Con_Printf ("Checking for 8-bit extension: ");
if (vid_use8bit->int_val) {
Tdfx_Init8bitPalette ();
Shared_Init8bitPalette ();
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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