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Get global fog working for multi-pass rendering.

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For the world textures, anyway. Entity multi-pass rendering still needs to
be verified.
This commit is contained in:
Bill Currie 2011-12-12 14:35:53 +09:00
parent ab2fe9f6a7
commit 8e531a58c2
1 changed files with 82 additions and 16 deletions
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90
libs/video/renderer/gl/gl_rsurf.c
View file

@ -29,8 +29,7 @@
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] =
"$Id$";
static __attribute__ ((used)) const char rcsid[] = "$Id$";
#ifdef HAVE_STRING_H
# include <string.h>
@ -281,7 +280,7 @@ R_DrawWaterSurfaces (void)
}
static inline void
DrawTextureChains (void)
DrawTextureChains (int disable_blend, int do_bind)
{
int i;
msurface_t *s;
@ -330,8 +329,6 @@ DrawTextureChains (void)
qglActiveTexture (gl_mtex_enum + 0);
}
tex->texturechain = NULL;
tex->texturechain_tail = &tex->texturechain;
}
// Turn off lightmaps for other entities
qglActiveTexture (gl_mtex_enum + 1);
@ -341,22 +338,36 @@ DrawTextureChains (void)
qglActiveTexture (gl_mtex_enum + 0);
qfglTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
} else {
if (disable_blend)
qfglDisable (GL_BLEND);
for (i = 0; i < r_worldentity.model->numtextures; i++) {
tex = r_worldentity.model->textures[i];
if (!tex)
continue;
if (do_bind)
qfglBindTexture (GL_TEXTURE_2D, tex->gl_texturenum);
for (s = tex->texturechain; s; s = s->texturechain)
R_RenderBrushPoly_1 (s);
}
if (disable_blend)
qfglEnable (GL_BLEND);
}
}
static void
clear_texture_chains (void)
{
int i;
texture_t *tex;
for (i = 0; i < r_worldentity.model->numtextures; i++) {
tex = r_worldentity.model->textures[i];
if (!tex)
continue;
tex->texturechain = NULL;
tex->texturechain_tail = &tex->texturechain;
}
qfglEnable (GL_BLEND);
}
tex = r_notexture_mip;
tex->texturechain = NULL;
tex->texturechain_tail = &tex->texturechain;
@ -709,13 +720,68 @@ R_DrawWorld (void)
R_DrawSkyChain (sky_chain);
DrawTextureChains ();
if (gl_mtex_active_tmus <= 1)
R_BlendLightmaps ();
if (!Fog_GetDensity ()
|| (gl_fb_bmodels->int_val && gl_mtex_fullbright)
|| gl_mtex_active_tmus > 1) {
// we have enough active TMUs to render everything in one go
// or we're not doing fog
DrawTextureChains (1, 1);
if (gl_fb_bmodels->int_val && !gl_mtex_fullbright)
R_RenderFullbrights ();
} else {
if (gl_mtex_active_tmus > 1) {
// textures and lightmaps in one pass
// black fog
// no blending
Fog_StartAdditive ();
DrawTextureChains (1, 1);
// buf = fTL + (1-f)0
// = fTL
} else {
// texture pass + lightmap pass
// no fog
// no blending
Fog_DisableGFog ();
DrawTextureChains (1, 1);
// buf = T
// black fog
// blend: buf = zero, src (non-overbright)
// FIXME overbright broken?
Fog_EnableGFog ();
Fog_StartAdditive ();
R_BlendLightmaps (); //leaves blending as As, 1-As
// buf = I*0 + buf*I
// = T*C
// = T(fL + (1-f)0)
// = fTL
}
// fullbright pass
// fog is still black
R_RenderFullbrights ();
// buf = aI + (1-a)buf
// = aC + (1-a)fTL
// = a(fG + (1-f)0) + (1-a)fTL
// = afG + (1-a)fTL
// = f((1-a)TL + aG)
Fog_StopAdditive (); // use fog color
qfglDepthMask (GL_FALSE); // don't write Z
qfglBlendFunc (GL_ONE, GL_ONE);
// draw black polys
qfglColor4f (0, 0, 0, 1);
DrawTextureChains (0, 0);
// buf = I + buf
// = C + f((1-a)TL + aG)
// = (f0 + (1-f)F) + f((1-a)TL + aG)
// = (1-f)F + f((1-a)TL + aG)
// = f((1-a)TL + aG) + (1-f)F
// restore state
qfglColor4ubv (color_white);
qfglBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
qfglDepthMask (GL_TRUE);
}
clear_texture_chains ();
}
void