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/*
Copyright (C) 2003-2006 Andrey Nazarov
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 the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "gl_local.h"
glState_t gls;
void GL_BindTexture( int texnum ) {
if( gls.texnum[gls.tmu] == texnum ) {
return;
}
qglBindTexture( GL_TEXTURE_2D, texnum );
c.texSwitches++;
gls.texnum[gls.tmu] = texnum;
}
void GL_SelectTMU( int tmu ) {
if( gls.tmu == tmu ) {
return;
}
if( tmu < 0 || tmu >= gl_static.numTextureUnits ) {
Com_Error( ERR_FATAL, "GL_SelectTMU: bad tmu %d", tmu );
}
qglActiveTextureARB( GL_TEXTURE0_ARB + tmu );
qglClientActiveTextureARB( GL_TEXTURE0_ARB + tmu );
gls.tmu = tmu;
}
void GL_TexEnv( GLenum texenv ) {
if( gls.texenv[gls.tmu] == texenv ) {
return;
}
switch( texenv ) {
case GL_REPLACE:
qglTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );
break;
case GL_MODULATE:
qglTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
break;
case GL_BLEND:
qglTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND );
break;
case GL_ADD:
qglTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD );
break;
default:
Com_Error( ERR_FATAL, "GL_TexEnv: bad texenv" );
break;
}
gls.texenv[gls.tmu] = texenv;
}
void GL_CullFace( glCullFace_t cull ) {
if( gls.cull == cull ) {
return;
}
switch( cull ) {
case GLS_CULL_DISABLE:
qglDisable( GL_CULL_FACE );
break;
case GLS_CULL_FRONT:
qglEnable( GL_CULL_FACE );
qglCullFace( GL_FRONT );
break;
case GLS_CULL_BACK:
qglEnable( GL_CULL_FACE );
qglCullFace( GL_BACK );
break;
default:
Com_Error( ERR_FATAL, "GL_CullFace: bad cull" );
break;
}
gls.cull = cull;
}
void GL_Bits( glStateBits_t bits ) {
glStateBits_t diff = bits ^ gls.bits;
if( !diff ) {
return;
}
if( diff & GLS_BLEND_MASK ) {
if( bits & GLS_BLEND_MASK ) {
qglEnable( GL_BLEND );
if( bits & GLS_BLEND_BLEND ) {
qglBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
} else if( bits & GLS_BLEND_ADD ) {
qglBlendFunc( GL_SRC_ALPHA, GL_ONE );
} else if( bits & GLS_BLEND_MODULATE ) {
qglBlendFunc( GL_DST_COLOR, GL_ONE );
}
} else {
qglDisable( GL_BLEND );
}
}
if( diff & GLS_DEPTHMASK_FALSE ) {
if( bits & GLS_DEPTHMASK_FALSE ) {
qglDepthMask( GL_FALSE );
} else {
qglDepthMask( GL_TRUE );
}
}
if( diff & GLS_DEPTHTEST_DISABLE ) {
if( bits & GLS_DEPTHTEST_DISABLE ) {
qglDisable( GL_DEPTH_TEST );
} else {
qglEnable( GL_DEPTH_TEST );
}
}
if( diff & GLS_ALPHATEST_ENABLE ) {
if( bits & GLS_ALPHATEST_ENABLE ) {
qglEnable( GL_ALPHA_TEST );
} else {
qglDisable( GL_ALPHA_TEST );
}
}
gls.bits = bits;
}
void GL_Setup2D( void ) {
qglViewport( 0, 0, gl_config.vidWidth, gl_config.vidHeight );
qglMatrixMode( GL_PROJECTION );
qglLoadIdentity();
qglOrtho( 0, gl_config.vidWidth, gl_config.vidHeight, 0, -1, 1 );
draw.scale = 1;
*( uint32 * )draw.color = *( uint32 * )colorWhite;
if( draw.flags & DRAW_CLIP_MASK ) {
qglDisable( GL_SCISSOR_TEST );
}
draw.flags = 0;
qglMatrixMode( GL_MODELVIEW );
qglLoadIdentity();
GL_Bits( GLS_DEPTHTEST_DISABLE );
GL_CullFace( GLS_CULL_DISABLE );
}
static inline void MYgluPerspective( GLdouble fovy, GLdouble aspect,
GLdouble zNear, GLdouble zFar )
{
GLdouble xmin, xmax, ymin, ymax;
ymax = zNear * tan( fovy * M_PI / 360.0 );
ymin = -ymax;
xmin = ymin * aspect;
xmax = ymax * aspect;
qglFrustum( xmin, xmax, ymin, ymax, zNear, zFar );
}
void GL_Setup3D( void ) {
float screenAspect;
int yb;
yb = glr.fd.y + glr.fd.height;
qglViewport( glr.fd.x, gl_config.vidHeight - yb,
glr.fd.width, glr.fd.height );
screenAspect = ( float )glr.fd.width / glr.fd.height;
qglMatrixMode( GL_PROJECTION );
qglLoadIdentity();
MYgluPerspective( glr.fd.fov_y, screenAspect,
gl_znear->value, gl_zfar->value );
qglMatrixMode( GL_MODELVIEW );
qglLoadIdentity();
qglRotatef( -90, 1, 0, 0 ); /* put z axis up */
qglRotatef( 90, 0, 0, 1 ); /* put y axis west, x axis north */
qglRotatef( -glr.fd.viewangles[ROLL], 1, 0, 0 );
qglRotatef( -glr.fd.viewangles[PITCH], 0, 1, 0 );
qglRotatef( -glr.fd.viewangles[YAW], 0, 0, 1 );
qglTranslatef( -glr.fd.vieworg[0], -glr.fd.vieworg[1], -glr.fd.vieworg[2] );
GL_Bits( GLS_DEFAULT );
GL_CullFace( GLS_CULL_FRONT );
qglClear( GL_DEPTH_BUFFER_BIT );
}
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