C++ qglPushMatrix函数代码示例

void CMistyFog2::Render(CWorldEffectsSystem *system)
{
	if (mFadeAlpha <= 0.0)
	{
		return;
	}

	qglMatrixMode(GL_PROJECTION);
	qglPushMatrix();
    qglLoadIdentity ();
	MYgluPerspective (80.0,  1.0,  4,  2048.0);

	qglMatrixMode(GL_MODELVIEW);
	qglPushMatrix();
    qglLoadIdentity ();
    qglRotatef (-90,  1, 0, 0);	    // put Z going up
    qglRotatef (90,  0, 0, 1);	    // put Z going up
    qglRotatef (0,  1, 0, 0);
    qglRotatef (-90,  0, 1, 0);
    qglRotatef (-90,  0, 0, 1);

	qglDisable(GL_TEXTURE_2D);
	GL_State(GLS_SRCBLEND_SRC_ALPHA|GLS_DSTBLEND_ONE);
	qglShadeModel (GL_SMOOTH);

	qglColorPointer(4, GL_FLOAT, 0, mColors);
	qglEnableClientState(GL_COLOR_ARRAY);

	qglVertexPointer( 3, GL_FLOAT, 0, mVerts );
	qglEnableClientState(GL_VERTEX_ARRAY);

	if (qglLockArraysEXT) 
	{
		qglLockArraysEXT(0, MISTYFOG_HEIGHT*MISTYFOG_WIDTH);
	}
	qglDrawElements(GL_QUADS, (MISTYFOG_HEIGHT-1)*(MISTYFOG_WIDTH-1)*4, GL_UNSIGNED_INT, mIndexes);
	if ( qglUnlockArraysEXT ) 
	{
		qglUnlockArraysEXT();
	}

	qglDisableClientState(GL_COLOR_ARRAY);
//	qglDisableClientState(GL_VERTEX_ARRAY);	 backend doesn't ever re=enable this properly

	qglPopMatrix();
	qglMatrixMode(GL_PROJECTION);
	qglPopMatrix();
	qglMatrixMode(GL_MODELVIEW);	// bug somewhere in the backend which requires this
}

/*
=================
RB_ShadowFinish

Darken everything that is is a shadow volume.
We have to delay this until everything has been shadowed,
because otherwise shadows from different body parts would
overlap and double darken.
=================
*/
void RB_ShadowFinish( void ) {
#if defined(VV_LIGHTING) && defined(_XBOX)
	StencilShadower.FinishShadows();
#else
	if ( r_shadows->integer != 2 ) {
		return;
	}
	if ( glConfig.stencilBits < 4 ) {
		return;
	}

#ifdef _DEBUG_STENCIL_SHADOWS
	return;
#endif

	qglEnable( GL_STENCIL_TEST );
	qglStencilFunc( GL_NOTEQUAL, 0, 255 );

	qglStencilOp( GL_KEEP, GL_KEEP, GL_KEEP );

	bool planeZeroBack = false;
	if (qglIsEnabled(GL_CLIP_PLANE0))
	{
		planeZeroBack = true;
		qglDisable (GL_CLIP_PLANE0);
	}
	GL_Cull(CT_TWO_SIDED);
	//qglDisable (GL_CULL_FACE);

	GL_Bind( tr.whiteImage );

	qglPushMatrix();
    qglLoadIdentity ();

//	qglColor3f( 0.6f, 0.6f, 0.6f );
//	GL_State( GLS_DEPTHMASK_TRUE | GLS_SRCBLEND_DST_COLOR | GLS_DSTBLEND_ZERO );

//	qglColor3f( 1, 0, 0 );
//	GL_State( GLS_DEPTHMASK_TRUE | GLS_SRCBLEND_ONE | GLS_DSTBLEND_ZERO );

	qglColor4f( 0.0f, 0.0f, 0.0f, 0.5f );
	//GL_State( GLS_DEPTHMASK_TRUE | GLS_SRCBLEND_SRC_ALPHA | GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA );
	GL_State( GLS_SRCBLEND_SRC_ALPHA | GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA );

	qglBegin( GL_QUADS );
	qglVertex3f( -100, 100, -10 );
	qglVertex3f( 100, 100, -10 );
	qglVertex3f( 100, -100, -10 );
	qglVertex3f( -100, -100, -10 );
	qglEnd ();

	qglColor4f(1,1,1,1);
	qglDisable( GL_STENCIL_TEST );
	if (planeZeroBack)
	{
		qglEnable (GL_CLIP_PLANE0);
	}
	qglPopMatrix();
#endif // VV_LIGHTING && _XBOX
}

/*
================
RB_StageIteratorSky

All of the visible sky triangles are in tess

Other things could be stuck in here, like birds in the sky, etc
================
*/
void RB_StageIteratorSky( void )
{
	if ( g_bRenderGlowingObjects )
		return;

	if ( r_fastsky->integer ) {
		return;
	}

	if (skyboxportal && !(backEnd.refdef.rdflags & RDF_SKYBOXPORTAL))
	{
		return;
	}

	// go through all the polygons and project them onto
	// the sky box to see which blocks on each side need
	// to be drawn
	RB_ClipSkyPolygons( &tess );

	// r_showsky will let all the sky blocks be drawn in
	// front of everything to allow developers to see how
	// much sky is getting sucked in
	if ( r_showsky->integer ) {
		qglDepthRange( 0.0, 0.0 );
	} else {
		qglDepthRange( 1.0, 1.0 );
	}

	// draw the outer skybox
	if ( tess.shader->sky->outerbox[0] && tess.shader->sky->outerbox[0] != tr.defaultImage ) {
		qglColor3f( tr.identityLight, tr.identityLight, tr.identityLight );

		qglPushMatrix ();
		GL_State( 0 );
		qglTranslatef (backEnd.viewParms.ori.origin[0], backEnd.viewParms.ori.origin[1], backEnd.viewParms.ori.origin[2]);

		DrawSkyBox( tess.shader );

		qglPopMatrix();
	}

	// generate the vertexes for all the clouds, which will be drawn
	// by the generic shader routine
	R_BuildCloudData( &tess );

	if (tess.numIndexes && tess.numVertexes)
	{
		RB_StageIteratorGeneric();
	}

	// draw the inner skybox


	// back to normal depth range
	qglDepthRange( 0.0, 1.0 );

	// note that sky was drawn so we will draw a sun later
	backEnd.skyRenderedThisView = qtrue;
}

/*
==================
RB_STD_LightScale

Perform extra blending passes to multiply the entire buffer by
a floating point value
==================
*/
void RB_STD_LightScale( void ) {
	float	v, f;

	if ( backEnd.overBright == 1.0f ) {
		return;
	}

	if ( r_skipLightScale.GetBool() ) {
		return;
	}

	// the scissor may be smaller than the viewport for subviews
	if ( r_useScissor.GetBool() ) {
		qglScissor( backEnd.viewDef->viewport.x1 + backEnd.viewDef->scissor.x1,
			backEnd.viewDef->viewport.y1 + backEnd.viewDef->scissor.y1,
			backEnd.viewDef->scissor.x2 - backEnd.viewDef->scissor.x1 + 1,
			backEnd.viewDef->scissor.y2 - backEnd.viewDef->scissor.y1 + 1 );
		backEnd.currentScissor = backEnd.viewDef->scissor;
	}

	// full screen blends
	qglLoadIdentity();
	qglMatrixMode( GL_PROJECTION );
	qglPushMatrix();
	qglLoadIdentity();
	qglOrtho( 0, 1, 0, 1, -1, 1 );

	GL_State( GLS_SRCBLEND_DST_COLOR | GLS_DSTBLEND_SRC_COLOR );
	GL_Cull( CT_TWO_SIDED );	// so mirror views also get it
	globalImages->BindNull();
	qglDisable( GL_DEPTH_TEST );
	qglDisable( GL_STENCIL_TEST );

	v = 1;
	while ( idMath::Fabs( v - backEnd.overBright ) > 0.01 ) {	// a little extra slop
		f = backEnd.overBright / v;
		f /= 2;
		if ( f > 1 ) {
			f = 1;
		}
		qglColor3f( f, f, f );
		v = v * f * 2;

		qglBegin( GL_QUADS );
		qglVertex2f( 0,0 );
		qglVertex2f( 0,1 );
		qglVertex2f( 1,1 );
		qglVertex2f( 1,0 );
		qglEnd();
	}


	qglPopMatrix();
	qglEnable( GL_DEPTH_TEST );
	qglMatrixMode( GL_MODELVIEW );
	GL_Cull( CT_FRONT_SIDED );
}

/*
=============
RB_DrawRotatePic2
=============
*/
const void *RB_RotatePic2 ( const void *data ) 
{
	const rotatePicCommand_t	*cmd;
	image_t *image;
	shader_t *shader;

	cmd = (const rotatePicCommand_t *)data;

	shader = cmd->shader;

	if ( shader->stages[0] )
	{
		image = shader->stages[0]->bundle[0].image[0];

		if ( image ) 
		{
			if ( !backEnd.projection2D ) 
			{
				RB_SetGL2D();
			}

			// Get our current blend mode, etc.
			GL_State( shader->stages[0]->stateBits );

			qglColor4ubv( backEnd.color2D );
			qglPushMatrix();

			// rotation point is going to be around the center of the passed in coordinates
			qglTranslatef( cmd->x, cmd->y, 0 );
			qglRotatef( cmd->a, 0.0, 0.0, 1.0 );
			
			GL_Bind( image );
			qglBegin( GL_QUADS );
				qglTexCoord2f( cmd->s1, cmd->t1);
				qglVertex2f( -cmd->w * 0.5f, -cmd->h * 0.5f );

				qglTexCoord2f( cmd->s2, cmd->t1 );
				qglVertex2f( cmd->w * 0.5f, -cmd->h * 0.5f );

				qglTexCoord2f( cmd->s2, cmd->t2 );
				qglVertex2f( cmd->w * 0.5f, cmd->h * 0.5f );

				qglTexCoord2f( cmd->s1, cmd->t2 );
				qglVertex2f( -cmd->w * 0.5f, cmd->h * 0.5f );
			qglEnd();
			
			qglPopMatrix();

			// Hmmm, this is not too cool
			GL_State( GLS_DEPTHTEST_DISABLE |
				  GLS_SRCBLEND_SRC_ALPHA |
				  GLS_DSTBLEND_ONE_MINUS_SRC_ALPHA );
		}
	}

	return (const void *)(cmd + 1);
}

void R_DrawSkyBox (void)
{
	int		i;

#if 0
qglEnable (GL_BLEND);
GL_TexEnv( GL_MODULATE );
qglColor4f (1,1,1,0.5);
qglDisable (GL_DEPTH_TEST);
#endif
	if (skyrotate)
	{	// check for no sky at all
		for (i=0 ; i<6 ; i++)
			if (skymins[0][i] < skymaxs[0][i]
			&& skymins[1][i] < skymaxs[1][i])
				break;
		if (i == 6)
			return;		// nothing visible
	}

qglPushMatrix ();
qglTranslatef (r_origin[0], r_origin[1], r_origin[2]);
qglRotatef (r_newrefdef.time * skyrotate, skyaxis[0], skyaxis[1], skyaxis[2]);

	for (i=0 ; i<6 ; i++)
	{
		if (skyrotate)
		{	// hack, forces full sky to draw when rotating
			skymins[0][i] = -1;
			skymins[1][i] = -1;
			skymaxs[0][i] = 1;
			skymaxs[1][i] = 1;
		}

		if (skymins[0][i] >= skymaxs[0][i]
		|| skymins[1][i] >= skymaxs[1][i])
			continue;

		GL_Bind (sky_images[skytexorder[i]]->texnum);

		qglBegin (GL_QUADS);
		MakeSkyVec (skymins[0][i], skymins[1][i], i);
		MakeSkyVec (skymins[0][i], skymaxs[1][i], i);
		MakeSkyVec (skymaxs[0][i], skymaxs[1][i], i);
		MakeSkyVec (skymaxs[0][i], skymins[1][i], i);
		qglEnd ();
	}
qglPopMatrix ();
#if 0
glDisable (GL_BLEND);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glColor4f (1,1,1,0.5);
glEnable (GL_DEPTH_TEST);
#endif
}

/*
==============
R_DrawSkyBox
==============
*/
void R_DrawSkyBox( void ) {
    static const int skytexorder[6] = {0,2,1,3,4,5};
    vec5_t verts[4];
    int i;

    if( skyrotate ) {
        // hack, forces full sky to draw when rotating
        for( i = 0; i < 6; i++ ) {
            skymins[0][i] = -1;
            skymins[1][i] = -1;
            skymaxs[0][i] = 1;
            skymaxs[1][i] = 1;
        }
    } else {
        // check for no sky at all
        for( i = 0; i < 6; i++ ) {
            if( SKY_VISIBLE( i ) ) {
                break;
            }
        }
        if( i == 6 ) {
            return;     // nothing visible
        }
    }

    qglPushMatrix ();
    qglTranslatef (glr.fd.vieworg[0], glr.fd.vieworg[1], glr.fd.vieworg[2]);
    if( skyrotate ) {
        qglRotatef (glr.fd.time * skyrotate, skyaxis[0], skyaxis[1], skyaxis[2]);
    }

    GL_TexEnv( GL_REPLACE );
    GL_Bits( GLS_DEFAULT );

    qglVertexPointer( 3, GL_FLOAT, 5*4, &verts[0][0] );
    qglTexCoordPointer( 2, GL_FLOAT, 5*4, &verts[0][3] );

    for( i = 0; i < 6; i++ ) {
        if( !SKY_VISIBLE( i ) ) {
            continue;
        }

        GL_BindTexture (sky_images[skytexorder[i]]);

        MakeSkyVec (skymaxs[0][i], skymins[1][i], i, verts[0]);
        MakeSkyVec (skymins[0][i], skymins[1][i], i, verts[1]);
        MakeSkyVec (skymaxs[0][i], skymaxs[1][i], i, verts[2]);
        MakeSkyVec (skymins[0][i], skymaxs[1][i], i, verts[3]);
        qglDrawArrays( GL_TRIANGLE_STRIP, 0, 4 );
    }

    qglPopMatrix ();
}

void R_DrawSkyBox (void)
{
	int		i;

	if (skyrotate)
	{	// check for no sky at all
		for (i=0 ; i<6 ; i++)
			if (skymins[0][i] < skymaxs[0][i]
			&& skymins[1][i] < skymaxs[1][i])
				break;
		if (i == 6)
			return;		// nothing visible
	}

	qglPushMatrix ();
	qglTranslatef (r_origin[0], r_origin[1], r_origin[2]);
	qglRotatef (r_newrefdef.time * skyrotate, skyaxis[0], skyaxis[1], skyaxis[2]);

	for (i=0; i<6; i++)
	{
		if (skyrotate)
		{	// hack, forces full sky to draw when rotating
			skymins[0][i] = -1;
			skymins[1][i] = -1;
			skymaxs[0][i] = 1;
			skymaxs[1][i] = 1;
		}

		if (skymins[0][i] >= skymaxs[0][i]
		|| skymins[1][i] >= skymaxs[1][i])
			continue;

		GL_Bind (sky_images[skytexorder[i]]->texnum);

		rb_vertex = rb_index = 0;
		indexArray[rb_index++] = rb_vertex+0;
		indexArray[rb_index++] = rb_vertex+1;
		indexArray[rb_index++] = rb_vertex+2;
		indexArray[rb_index++] = rb_vertex+0;
		indexArray[rb_index++] = rb_vertex+2;
		indexArray[rb_index++] = rb_vertex+3;
		MakeSkyVec (skymins[0][i], skymins[1][i], i);
		MakeSkyVec (skymins[0][i], skymaxs[1][i], i);
		MakeSkyVec (skymaxs[0][i], skymaxs[1][i], i);
		MakeSkyVec (skymaxs[0][i], skymins[1][i], i);
		RB_RenderMeshGeneric (true);
	}

	qglPopMatrix ();
}

/*
 * RB_StageIteratorSky
 *
 * All of the visible sky triangles are in tess
 *
 * Other things could be stuck in here, like birds in the sky, etc
 */
void
RB_StageIteratorSky(void)
{
	if(r_fastsky->integer){
		return;
	}

	/* go through all the polygons and project them onto
	 * the sky box to see which blocks on each side need
	 * to be drawn */
	RB_ClipSkyPolygons(&tess);

	/* r_showsky will let all the sky blocks be drawn in
	 * front of everything to allow developers to see how
	 * much sky is getting sucked in */
	if(r_showsky->integer){
		qglDepthRange(0.0, 0.0);
	}else{
		qglDepthRange(1.0, 1.0);
	}

	/* draw the outer skybox */
	if(tess.shader->sky.outerbox[0] && tess.shader->sky.outerbox[0] != tr.defaultImage){
		qglColor3f(tr.identityLight, tr.identityLight, tr.identityLight);

		qglPushMatrix ();
		GL_State(0);
		qglTranslatef (backEnd.viewParms.or.origin[0], backEnd.viewParms.or.origin[1],
			backEnd.viewParms.or.origin[2]);

		DrawSkyBox(tess.shader);

		qglPopMatrix();
	}

	/* generate the vertexes for all the clouds, which will be drawn
	 * by the generic shader routine */
	R_BuildCloudData(&tess);

	RB_StageIteratorGeneric();

	/* draw the inner skybox */


	/* back to normal depth range */
	qglDepthRange(0.0, 1.0);

	/* note that sky was drawn so we will draw a sun later */
	backEnd.skyRenderedThisView = qtrue;
}

// All of the visible sky triangles are in tess
//	Other things could be stuck in here, like birds in the sky, etc
void RB_StageIteratorSky( void ) {
    if ( r_fastsky->integer ) {
        return;
    }

    // go through all the polygons and project them onto
    // the sky box to see which blocks on each side need
    // to be drawn
    RB_ClipSkyPolygons( &tess );

    // r_showsky will let all the sky blocks be drawn in
    // front of everything to allow developers to see how
    // much sky is getting sucked in
    if ( r_showsky->integer ) {
        qglDepthRange( 0.0, 0.0 );
    } else {
        qglDepthRange( 1.0, 1.0 );
    }

    // draw the outer skybox
    if ( tess.shader->sky.outerbox[0] && tess.shader->sky.outerbox[0] != tr.defaultImage ) {
        qglColor3f( tr.identityLight, tr.identityLight, tr.identityLight );

        qglPushMatrix();
        GL_State( 0 );
        qglTranslatef ( backEnd.viewParms.or.origin.x, backEnd.viewParms.or.origin.y, backEnd.viewParms.or.origin.z );

        DrawSkyBox( tess.shader );

        qglPopMatrix();
    }

    // generate the vertexes for all the clouds, which will be drawn
    // by the generic shader routine
    R_BuildCloudData( &tess );

    //QTZFIXME: This causes a load of GL errors when postprocessing is active :S
//	RB_StageIteratorGeneric();

    // draw the inner skybox


    // back to normal depth range
    qglDepthRange( 0.0, 1.0 );

    // note that sky was drawn so we will draw a sun later
    backEnd.skyRenderedThisView = qtrue;
}

void R_DrawSkyBox (void)
{
#ifndef PSP
	int		i;

	if (skyrotate)
	{	// check for no sky at all
		for (i=0 ; i<6 ; i++)
			if (skymins[0][i] < skymaxs[0][i]
			&& skymins[1][i] < skymaxs[1][i])
				break;
		if (i == 6)
			return;		// nothing visible
	}

qglPushMatrix ();
qglTranslatef (r_origin[0], r_origin[1], r_origin[2]);
qglRotatef (r_newrefdef.time * skyrotate, skyaxis[0], skyaxis[1], skyaxis[2]);

	for (i=0 ; i<6 ; i++)
	{
		if (skyrotate)
		{	// hack, forces full sky to draw when rotating
			skymins[0][i] = -1;
			skymins[1][i] = -1;
			skymaxs[0][i] = 1;
			skymaxs[1][i] = 1;
		}

		if (skymins[0][i] >= skymaxs[0][i]
		|| skymins[1][i] >= skymaxs[1][i])
			continue;

		GL_Bind (sky_images[skytexorder[i]]->texnum);

		qglBegin (GL_QUADS);
		MakeSkyVec (skymins[0][i], skymins[1][i], i);
		MakeSkyVec (skymins[0][i], skymaxs[1][i], i);
		MakeSkyVec (skymaxs[0][i], skymaxs[1][i], i);
		MakeSkyVec (skymaxs[0][i], skymins[1][i], i);
		qglEnd ();
	}
qglPopMatrix ();
#endif
}

/*
=============
RB_DrawRotatePic
=============
*/
const void *RB_RotatePic ( const void *data ) 
{
	const rotatePicCommand_t	*cmd;
	image_t *image;
	shader_t *shader;

	cmd = (const rotatePicCommand_t *)data;

	shader = cmd->shader;
	image = &shader->stages[0].bundle[0].image[0];

	if ( image ) {
		if ( !backEnd.projection2D ) {
			RB_SetGL2D();
		}

		qglColor4ubv( backEnd.color2D );
		qglPushMatrix();

		qglTranslatef(cmd->x+cmd->w,cmd->y,0);
		qglRotatef(cmd->a, 0.0, 0.0, 1.0);
		
		GL_Bind( image );
#ifdef _XBOX
		qglBeginEXT (GL_QUADS, 4, 0, 0, 4, 0);
#else
		qglBegin (GL_QUADS);
#endif
		qglTexCoord2f( cmd->s1, cmd->t1);
		qglVertex2f( -cmd->w, 0 );
		qglTexCoord2f( cmd->s2, cmd->t1 );
		qglVertex2f( 0, 0 );
		qglTexCoord2f( cmd->s2, cmd->t2 );
		qglVertex2f( 0, cmd->h );
		qglTexCoord2f( cmd->s1, cmd->t2 );
		qglVertex2f( -cmd->w, cmd->h );
		qglEnd();
		
		qglPopMatrix();
	}

	return (const void *)(cmd + 1);
}

void RB_StageIteratorSky()
{
	if ( r_fastsky->integer ) {
		return;
	}

	GL_Program();

	// project all the polygons onto the sky box
	// to see which blocks on each side need to be drawn
	RB_ClipSkyPolygons( &tess );

	CalcSkyBounds();

	// r_showsky will let all the sky blocks be drawn in
	// front of everything to allow developers to see how
	// much sky is getting sucked in
	if ( r_showsky->integer ) {
		qglDepthRange( 0.0, 0.0 );
	} else {
		qglDepthRange( 1.0, 1.0 );
	}

	// draw the outer skybox
	if ( tess.shader->sky.outerbox[0] && tess.shader->sky.outerbox[0] != tr.defaultImage ) {
		qglColor3f( tr.identityLight, tr.identityLight, tr.identityLight );
		qglPushMatrix();
		GL_State( 0 );
		qglTranslatef (backEnd.viewParms.or.origin[0], backEnd.viewParms.or.origin[1], backEnd.viewParms.or.origin[2]);
		DrawSkyBox( tess.shader );
		qglPopMatrix();
	}

	// generate the vertexes for all the clouds (if any)
	// which will be drawn by the generic shader routine
	R_BuildCloudData( &tess );
	if (tess.numVertexes)
		ARB_StageIterator();

	// back to normal depth range
	qglDepthRange( 0.0, 1.0 );
}

void GLRB_DrawSkyBox( const skyboxDrawInfo_t* skybox, const float* eye_origin, const float* colorTint )
{
    int i, j, k;

    qglColor3fv( colorTint );		
	qglPushMatrix ();
	GL_State( 0 );
	qglTranslatef( eye_origin[0], eye_origin[1], eye_origin[2] );

    for ( i = 0; i < 6; ++i )
    {
        const skyboxSideDrawInfo_t* side = &skybox->sides[i];

        if ( !side->image )
            continue;

        GL_Bind( side->image );

        for ( j = 0; j < side->stripCount; ++j )
        {
            int start = side->stripInfo[j].offset;
            int end = side->stripInfo[j].length + start;

            qglBegin( GL_TRIANGLE_STRIP );

            for ( k = start; k < end; ++k )
            {
                qglTexCoord2fv( skybox->tbuffer + 2 * k );
                qglVertex3fv( skybox->vbuffer + 3 * k );
            }

            qglEnd();
        }
    }

	qglPopMatrix();
}

void RB_DistortionFill(void)
{
	float alpha = tr_distortionAlpha;
	float spost = 0.0f;
	float spost2 = 0.0f;

	if ( glConfig.stencilBits < 4 )
	{
		return;
	}

	//ok, cap the stupid thing now I guess
	if (!tr_distortionPrePost)
	{
		RB_CaptureScreenImage();
	}

	qglEnable(GL_STENCIL_TEST);
	qglStencilFunc(GL_NOTEQUAL, 0, 0xFFFFFFFF);
	qglStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);

	qglDisable (GL_CLIP_PLANE0);
	GL_Cull( CT_TWO_SIDED );

	//reset the view matrices and go into ortho mode
	qglMatrixMode(GL_PROJECTION);
	qglPushMatrix();
	qglLoadIdentity();
	qglOrtho(0, glConfig.vidWidth, glConfig.vidHeight, 32, -1, 1);
	qglMatrixMode(GL_MODELVIEW);
	qglPushMatrix();
	qglLoadIdentity();

	if (tr_distortionStretch)
	{ //override
		spost = tr_distortionStretch;
		spost2 = tr_distortionStretch;
	}
	else
	{ //do slow stretchy effect
		spost = sin(tr.refdef.time * 0.0005 + tr.refdef.timeFraction * 0.0005);
		if (spost < 0.0f)
		{
			spost = -spost;
		}
		spost *= 0.2f;

		spost2 = sin(tr.refdef.time * 0.0005 + tr.refdef.timeFraction * 0.0005);
		if (spost2 < 0.0f)
		{
			spost2 = -spost2;
		}
		spost2 *= 0.08f;
	}

	if (alpha != 1.0f)
	{ //blend
		GL_State(GLS_SRCBLEND_SRC_ALPHA|GLS_DSTBLEND_SRC_ALPHA);
	}
	else
	{ //be sure to reset the draw state
		GL_State(0);
	}


#ifdef HAVE_GLES
	qglColor4f(1.0f, 1.0f, 1.0f, alpha);
	GLboolean text = qglIsEnabled(GL_TEXTURE_COORD_ARRAY);
	GLboolean glcol = qglIsEnabled(GL_COLOR_ARRAY);
	if (!text)
		qglEnableClientState(GL_TEXTURE_COORD_ARRAY);
	if (glcol)
		qglDisableClientState(GL_COLOR_ARRAY);
	GLfloat tex[] = {
		0 + spost2, 1 - spost,
		0 + spost2, 0 + spost,
		1 - spost2, 0 + spost,
		1 - spost2, 1 - spost
	};
	GLfloat vtx[] = {
		0, 0,
		0, glConfig.vidHeight,
		glConfig.vidWidth, glConfig.vidHeight,
		glConfig.vidWidth, 0
	};
	qglTexCoordPointer(2, GL_FLOAT, 0, tex);
	qglVertexPointer(2, GL_FLOAT, 0, vtx);
	qglDrawArrays(GL_TRIANGLE_FAN, 0, 4);
	/*	if (glcol)
	qglEnableClientState( GL_COLOR_ARRAY );
	if (!text)
	qglDisableClientState( GL_TEXTURE_COORD_ARRAY );*/
#else
	qglBegin(GL_QUADS);
		qglColor4f(1.0f, 1.0f, 1.0f, alpha);
		qglTexCoord2f(0+spost2, 1-spost);
		qglVertex2f(0, 0);

		qglTexCoord2f(0+spost2, 0+spost);
		qglVertex2f(0, glConfig.vidHeight);
//.........这里部分代码省略.........