PDGL_API void pdglStencilOp(GLenum fail,
GLenum zfail, GLenum zpass)
{
if(pglStencilOp)
{ pglStencilOp(fail, zfail, zpass); return; }
pglStencilOp=pdglGetProcAddress("glStencilOp");
pglStencilOp(fail, zfail, zpass);
}
void DrawSurfaceDecals( msurface_t *fa )
{
decal_t *p;
cl_entity_t *e;
if( !fa->pdecals ) return;
e = RI.currententity;
ASSERT( e != NULL );
if( e->curstate.rendermode == kRenderNormal || e->curstate.rendermode == kRenderTransAlpha )
{
pglDepthMask( GL_FALSE );
pglEnable( GL_BLEND );
if( e->curstate.rendermode == kRenderTransAlpha )
pglDisable( GL_ALPHA_TEST );
}
if( e->curstate.rendermode == kRenderTransColor )
pglEnable( GL_TEXTURE_2D );
if( e->curstate.rendermode == kRenderTransTexture || e->curstate.rendermode == kRenderTransAdd )
GL_Cull( GL_NONE );
pglEnable( GL_POLYGON_OFFSET_FILL );
pglBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
if( fa->flags & SURF_TRANSPARENT && glState.stencilEnabled )
{
mtexinfo_t *tex = fa->texinfo;
for( p = fa->pdecals; p; p = p->pnext )
{
if( p->texture )
{
float *o, *v;
int i, numVerts;
o = R_DecalSetupVerts( p, fa, p->texture, &numVerts );
pglEnable( GL_STENCIL_TEST );
pglStencilFunc( GL_ALWAYS, 1, 0xFFFFFFFF );
pglColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
pglStencilOp( GL_KEEP, GL_KEEP, GL_REPLACE );
pglBegin( GL_POLYGON );
for( i = 0, v = o; i < numVerts; i++, v += VERTEXSIZE )
{
v[5] = ( DotProduct( v, tex->vecs[0] ) + tex->vecs[0][3] ) / tex->texture->width;
v[6] = ( DotProduct( v, tex->vecs[1] ) + tex->vecs[1][3] ) / tex->texture->height;
pglTexCoord2f( v[5], v[6] );
pglVertex3fv( v );
}
pglEnd();
pglStencilOp( GL_KEEP, GL_KEEP, GL_DECR );
pglEnable( GL_ALPHA_TEST );
pglBegin( GL_POLYGON );
for( i = 0, v = o; i < numVerts; i++, v += VERTEXSIZE )
{
pglTexCoord2f( v[5], v[6] );
pglVertex3fv( v );
}
pglEnd();
pglDisable( GL_ALPHA_TEST );
pglColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
pglStencilFunc( GL_EQUAL, 0, 0xFFFFFFFF );
pglStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );
}
}
}
for( p = fa->pdecals; p; p = p->pnext )
{
if( p->texture )
{
gltexture_t *glt = R_GetTexture( p->texture );
// normal HL decal with alpha-channel
if( glt->flags & TF_HAS_ALPHA )
{
// draw transparent decals with GL_MODULATE
if( glt->fogParams[3] > DECAL_TRANSPARENT_THRESHOLD )
pglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
else pglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
pglBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
}
else
{
// color decal like detail texture. Base color is 127 127 127
pglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
pglBlendFunc( GL_DST_COLOR, GL_SRC_COLOR );
}
DrawSingleDecal( p, fa );
}
}
if( fa->flags & SURF_TRANSPARENT && glState.stencilEnabled )
pglDisable( GL_STENCIL_TEST );
if( e->curstate.rendermode == kRenderNormal || e->curstate.rendermode == kRenderTransAlpha )
{
pglDepthMask( GL_TRUE );
pglDisable( GL_BLEND );
if( e->curstate.rendermode == kRenderTransAlpha )
pglEnable( GL_ALPHA_TEST );
}
pglDisable( GL_POLYGON_OFFSET_FILL );
if( e->curstate.rendermode == kRenderTransTexture || e->curstate.rendermode == kRenderTransAdd )
GL_Cull( GL_FRONT );
if( e->curstate.rendermode == kRenderTransColor )
pglDisable( GL_TEXTURE_2D );
// restore blendfunc here
if( e->curstate.rendermode == kRenderTransAdd || e->curstate.rendermode == kRenderGlow )
pglBlendFunc( GL_SRC_ALPHA, GL_ONE );
}