/*
** GL_State
**
** This routine is responsible for setting the most commonly changed state
** in Q3.
*/
void GL_State( unsigned long stateBits ) {
unsigned long diff = stateBits ^ glState.glStateBits;
if ( !diff ) {
return;
}
//
// check depthFunc bits
//
if ( diff & GLS_DEPTHFUNC_EQUAL ) {
if ( stateBits & GLS_DEPTHFUNC_EQUAL ) {
qglDepthFunc( GL_EQUAL );
} else
{
qglDepthFunc( GL_LEQUAL );
}
}
//
// check blend bits
//
if ( diff & ( GLS_SRCBLEND_BITS | GLS_DSTBLEND_BITS ) ) {
GLenum srcFactor = GL_ONE, dstFactor = GL_ONE;
if ( stateBits & ( GLS_SRCBLEND_BITS | GLS_DSTBLEND_BITS ) ) {
switch ( stateBits & GLS_SRCBLEND_BITS )
{
case GLS_SRCBLEND_ZERO:
srcFactor = GL_ZERO;
break;
case GLS_SRCBLEND_ONE:
srcFactor = GL_ONE;
break;
case GLS_SRCBLEND_DST_COLOR:
srcFactor = GL_DST_COLOR;
break;
case GLS_SRCBLEND_ONE_MINUS_DST_COLOR:
srcFactor = GL_ONE_MINUS_DST_COLOR;
break;
case GLS_SRCBLEND_SRC_ALPHA:
srcFactor = GL_SRC_ALPHA;
break;
case GLS_SRCBLEND_ONE_MINUS_SRC_ALPHA:
srcFactor = GL_ONE_MINUS_SRC_ALPHA;
break;
case GLS_SRCBLEND_DST_ALPHA:
srcFactor = GL_DST_ALPHA;
break;
case GLS_SRCBLEND_ONE_MINUS_DST_ALPHA:
srcFactor = GL_ONE_MINUS_DST_ALPHA;
break;
case GLS_SRCBLEND_ALPHA_SATURATE:
srcFactor = GL_SRC_ALPHA_SATURATE;
break;
default:
ri.Error( ERR_DROP, "GL_State: invalid src blend state bits" );
break;
}
switch ( stateBits & GLS_DSTBLEND_BITS )
{
case GLS_DSTBLEND_ZERO:
dstFactor = GL_ZERO;
break;
case GLS_DSTBLEND_ONE:
dstFactor = GL_ONE;
break;
case GLS_DSTBLEND_SRC_COLOR:
dstFactor = GL_SRC_COLOR;
break;
case GLS_DSTBLEND_ONE_MINUS_SRC_COLOR:
dstFactor = GL_ONE_MINUS_SRC_COLOR;
break;
case GLS_DSTBLEND_SRC_ALPHA:
dstFactor = GL_SRC_ALPHA;
break;
case GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA:
dstFactor = GL_ONE_MINUS_SRC_ALPHA;
break;
case GLS_DSTBLEND_DST_ALPHA:
dstFactor = GL_DST_ALPHA;
break;
case GLS_DSTBLEND_ONE_MINUS_DST_ALPHA:
dstFactor = GL_ONE_MINUS_DST_ALPHA;
break;
default:
ri.Error( ERR_DROP, "GL_State: invalid dst blend state bits" );
break;
}
qglEnable( GL_BLEND );
qglBlendFunc( srcFactor, dstFactor );
} else
{
qglDisable( GL_BLEND );
}
}
//
// check depthmask
//
if ( diff & GLS_DEPTHMASK_TRUE ) {
if ( stateBits & GLS_DEPTHMASK_TRUE ) {
qglDepthMask( GL_TRUE );
} else
{
qglDepthMask( GL_FALSE );
}
}
//
// fill/line mode
//
if ( diff & GLS_POLYMODE_LINE ) {
#ifndef USE_OPENGLES
if ( stateBits & GLS_POLYMODE_LINE ) {
qglPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
} else
{
qglPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
}
#endif
}
//
// depthtest
//
if ( diff & GLS_DEPTHTEST_DISABLE ) {
if ( stateBits & GLS_DEPTHTEST_DISABLE ) {
qglDisable( GL_DEPTH_TEST );
} else
{
qglEnable( GL_DEPTH_TEST );
}
}
//
// alpha test
//
if ( diff & GLS_ATEST_BITS ) {
switch ( stateBits & GLS_ATEST_BITS )
{
case 0:
qglDisable( GL_ALPHA_TEST );
break;
case GLS_ATEST_GT_0:
qglEnable( GL_ALPHA_TEST );
qglAlphaFunc( GL_GREATER, 0.0f );
break;
case GLS_ATEST_LT_80:
qglEnable( GL_ALPHA_TEST );
qglAlphaFunc( GL_LESS, 0.5f );
break;
case GLS_ATEST_GE_80:
qglEnable( GL_ALPHA_TEST );
qglAlphaFunc( GL_GEQUAL, 0.5f );
break;
default:
assert( 0 );
break;
}
}
glState.glStateBits = stateBits;
}
/*
====================
GL_State
This routine is responsible for setting the most commonly changed state
====================
*/
void GL_State( int stateBits ) {
int diff;
if ( !r_useStateCaching.GetBool() || backEnd.glState.forceGlState ) {
// make sure everything is set all the time, so we
// can see if our delta checking is screwing up
diff = -1;
backEnd.glState.forceGlState = false;
} else {
diff = stateBits ^ backEnd.glState.glStateBits;
if ( !diff ) {
return;
}
}
//
// check depthFunc bits
//
if ( diff & ( GLS_DEPTHFUNC_EQUAL | GLS_DEPTHFUNC_LESS | GLS_DEPTHFUNC_ALWAYS ) ) {
if ( stateBits & GLS_DEPTHFUNC_EQUAL ) {
qglDepthFunc( GL_EQUAL );
} else if ( stateBits & GLS_DEPTHFUNC_ALWAYS ) {
qglDepthFunc( GL_ALWAYS );
} else {
qglDepthFunc( GL_LEQUAL );
}
}
//
// check blend bits
//
if ( diff & ( GLS_SRCBLEND_BITS | GLS_DSTBLEND_BITS ) ) {
GLenum srcFactor, dstFactor;
switch ( stateBits & GLS_SRCBLEND_BITS ) {
case GLS_SRCBLEND_ZERO:
srcFactor = GL_ZERO;
break;
case GLS_SRCBLEND_ONE:
srcFactor = GL_ONE;
break;
case GLS_SRCBLEND_DST_COLOR:
srcFactor = GL_DST_COLOR;
break;
case GLS_SRCBLEND_ONE_MINUS_DST_COLOR:
srcFactor = GL_ONE_MINUS_DST_COLOR;
break;
case GLS_SRCBLEND_SRC_ALPHA:
srcFactor = GL_SRC_ALPHA;
break;
case GLS_SRCBLEND_ONE_MINUS_SRC_ALPHA:
srcFactor = GL_ONE_MINUS_SRC_ALPHA;
break;
case GLS_SRCBLEND_DST_ALPHA:
srcFactor = GL_DST_ALPHA;
break;
case GLS_SRCBLEND_ONE_MINUS_DST_ALPHA:
srcFactor = GL_ONE_MINUS_DST_ALPHA;
break;
case GLS_SRCBLEND_ALPHA_SATURATE:
srcFactor = GL_SRC_ALPHA_SATURATE;
break;
default:
srcFactor = GL_ONE; // to get warning to shut up
common->Error( "GL_State: invalid src blend state bits\n" );
break;
}
switch ( stateBits & GLS_DSTBLEND_BITS ) {
case GLS_DSTBLEND_ZERO:
dstFactor = GL_ZERO;
break;
case GLS_DSTBLEND_ONE:
dstFactor = GL_ONE;
break;
case GLS_DSTBLEND_SRC_COLOR:
dstFactor = GL_SRC_COLOR;
break;
case GLS_DSTBLEND_ONE_MINUS_SRC_COLOR:
dstFactor = GL_ONE_MINUS_SRC_COLOR;
break;
case GLS_DSTBLEND_SRC_ALPHA:
dstFactor = GL_SRC_ALPHA;
break;
case GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA:
dstFactor = GL_ONE_MINUS_SRC_ALPHA;
break;
case GLS_DSTBLEND_DST_ALPHA:
dstFactor = GL_DST_ALPHA;
break;
case GLS_DSTBLEND_ONE_MINUS_DST_ALPHA:
dstFactor = GL_ONE_MINUS_DST_ALPHA;
break;
default:
dstFactor = GL_ONE; // to get warning to shut up
common->Error( "GL_State: invalid dst blend state bits\n" );
break;
}
qglBlendFunc( srcFactor, dstFactor );
}
//
// check depthmask
//
if ( diff & GLS_DEPTHMASK ) {
if ( stateBits & GLS_DEPTHMASK ) {
qglDepthMask( GL_FALSE );
} else {
qglDepthMask( GL_TRUE );
}
}
//
// check colormask
//
if ( diff & (GLS_REDMASK|GLS_GREENMASK|GLS_BLUEMASK|GLS_ALPHAMASK) ) {
GLboolean r, g, b, a;
r = ( stateBits & GLS_REDMASK ) ? 0 : 1;
g = ( stateBits & GLS_GREENMASK ) ? 0 : 1;
b = ( stateBits & GLS_BLUEMASK ) ? 0 : 1;
a = ( stateBits & GLS_ALPHAMASK ) ? 0 : 1;
qglColorMask( r, g, b, a );
}
//
// fill/line mode
//
if ( diff & GLS_POLYMODE_LINE ) {
if ( stateBits & GLS_POLYMODE_LINE ) {
qglPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
} else {
qglPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
}
}
//
// alpha test
//
if ( diff & GLS_ATEST_BITS ) {
switch ( stateBits & GLS_ATEST_BITS ) {
case 0:
qglDisable( GL_ALPHA_TEST );
break;
case GLS_ATEST_EQ_255:
qglEnable( GL_ALPHA_TEST );
qglAlphaFunc( GL_EQUAL, 1 );
break;
case GLS_ATEST_LT_128:
qglEnable( GL_ALPHA_TEST );
qglAlphaFunc( GL_LESS, 0.5 );
break;
case GLS_ATEST_GE_128:
qglEnable( GL_ALPHA_TEST );
qglAlphaFunc( GL_GEQUAL, 0.5 );
break;
default:
assert( 0 );
break;
}
}
backEnd.glState.glStateBits = stateBits;
}
