radeon_state.c

ati driver

/* radeon_state.c -- State support for Radeon -*- linux-c -*-
 *
 * Copyright 2000 VA Linux Systems, Inc., Fremont, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Gareth Hughes <[e-mail]>
 *    Kevin E. Martin <[e-mail]>
 */

#include "radeon.h"
#include "drmP.h"
#include "drm.h"
#include "drm_sarea.h"
#include "radeon_drm.h"
#include "radeon_drv.h"


/* ================================================================
 * CP hardware state programming functions
 */

static __inline__ void radeon_emit_clip_rect( drm_radeon_private_t *dev_priv,
					  drm_clip_rect_t *box )
{
	RING_LOCALS;

	DRM_DEBUG( "   box:  x1=%d y1=%d  x2=%d y2=%d\n",
		   box->x1, box->y1, box->x2, box->y2 );

	BEGIN_RING( 4 );
	OUT_RING( CP_PACKET0( RADEON_RE_TOP_LEFT, 0 ) );
	OUT_RING( (box->y1 << 16) | box->x1 );
	OUT_RING( CP_PACKET0( RADEON_RE_WIDTH_HEIGHT, 0 ) );
	OUT_RING( ((box->y2 - 1) << 16) | (box->x2 - 1) );
	ADVANCE_RING();
}

/* Emit 1.1 state
 */
static void radeon_emit_state( drm_radeon_private_t *dev_priv,
			       drm_radeon_context_regs_t *ctx,
			       drm_radeon_texture_regs_t *tex,
			       unsigned int dirty )
{
	RING_LOCALS;
	DRM_DEBUG( "dirty=0x%08x\n", dirty );

	if ( dirty & RADEON_UPLOAD_CONTEXT ) {
		BEGIN_RING( 14 );
		OUT_RING( CP_PACKET0( RADEON_PP_MISC, 6 ) );
		OUT_RING( ctx->pp_misc );
		OUT_RING( ctx->pp_fog_color );
		OUT_RING( ctx->re_solid_color );
		OUT_RING( ctx->rb3d_blendcntl );
		OUT_RING( ctx->rb3d_depthoffset );
		OUT_RING( ctx->rb3d_depthpitch );
		OUT_RING( ctx->rb3d_zstencilcntl );
		OUT_RING( CP_PACKET0( RADEON_PP_CNTL, 2 ) );
		OUT_RING( ctx->pp_cntl );
		OUT_RING( ctx->rb3d_cntl );
		OUT_RING( ctx->rb3d_coloroffset );
		OUT_RING( CP_PACKET0( RADEON_RB3D_COLORPITCH, 0 ) );
		OUT_RING( ctx->rb3d_colorpitch );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_VERTFMT ) {
		BEGIN_RING( 2 );
		OUT_RING( CP_PACKET0( RADEON_SE_COORD_FMT, 0 ) );
		OUT_RING( ctx->se_coord_fmt );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_LINE ) {
		BEGIN_RING( 5 );
		OUT_RING( CP_PACKET0( RADEON_RE_LINE_PATTERN, 1 ) );
		OUT_RING( ctx->re_line_pattern );
		OUT_RING( ctx->re_line_state );
		OUT_RING( CP_PACKET0( RADEON_SE_LINE_WIDTH, 0 ) );
		OUT_RING( ctx->se_line_width );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_BUMPMAP ) {
		BEGIN_RING( 5 );
		OUT_RING( CP_PACKET0( RADEON_PP_LUM_MATRIX, 0 ) );
		OUT_RING( ctx->pp_lum_matrix );
		OUT_RING( CP_PACKET0( RADEON_PP_ROT_MATRIX_0, 1 ) );
		OUT_RING( ctx->pp_rot_matrix_0 );
		OUT_RING( ctx->pp_rot_matrix_1 );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_MASKS ) {
		BEGIN_RING( 4 );
		OUT_RING( CP_PACKET0( RADEON_RB3D_STENCILREFMASK, 2 ) );
		OUT_RING( ctx->rb3d_stencilrefmask );
		OUT_RING( ctx->rb3d_ropcntl );
		OUT_RING( ctx->rb3d_planemask );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_VIEWPORT ) {
		BEGIN_RING( 7 );
		OUT_RING( CP_PACKET0( RADEON_SE_VPORT_XSCALE, 5 ) );
		OUT_RING( ctx->se_vport_xscale );
		OUT_RING( ctx->se_vport_xoffset );
		OUT_RING( ctx->se_vport_yscale );
		OUT_RING( ctx->se_vport_yoffset );
		OUT_RING( ctx->se_vport_zscale );
		OUT_RING( ctx->se_vport_zoffset );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_SETUP ) {
		BEGIN_RING( 4 );
		OUT_RING( CP_PACKET0( RADEON_SE_CNTL, 0 ) );
		OUT_RING( ctx->se_cntl );
		OUT_RING( CP_PACKET0( RADEON_SE_CNTL_STATUS, 0 ) );
		OUT_RING( ctx->se_cntl_status );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_MISC ) {
		BEGIN_RING( 2 );
		OUT_RING( CP_PACKET0( RADEON_RE_MISC, 0 ) );
		OUT_RING( ctx->re_misc );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_TEX0 ) {
		BEGIN_RING( 9 );
		OUT_RING( CP_PACKET0( RADEON_PP_TXFILTER_0, 5 ) );
		OUT_RING( tex[0].pp_txfilter );
		OUT_RING( tex[0].pp_txformat );
		OUT_RING( tex[0].pp_txoffset );
		OUT_RING( tex[0].pp_txcblend );
		OUT_RING( tex[0].pp_txablend );
		OUT_RING( tex[0].pp_tfactor );
		OUT_RING( CP_PACKET0( RADEON_PP_BORDER_COLOR_0, 0 ) );
		OUT_RING( tex[0].pp_border_color );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_TEX1 ) {
		BEGIN_RING( 9 );
		OUT_RING( CP_PACKET0( RADEON_PP_TXFILTER_1, 5 ) );
		OUT_RING( tex[1].pp_txfilter );
		OUT_RING( tex[1].pp_txformat );
		OUT_RING( tex[1].pp_txoffset );
		OUT_RING( tex[1].pp_txcblend );
		OUT_RING( tex[1].pp_txablend );
		OUT_RING( tex[1].pp_tfactor );
		OUT_RING( CP_PACKET0( RADEON_PP_BORDER_COLOR_1, 0 ) );
		OUT_RING( tex[1].pp_border_color );
		ADVANCE_RING();
	}

	if ( dirty & RADEON_UPLOAD_TEX2 ) {
		BEGIN_RING( 9 );
		OUT_RING( CP_PACKET0( RADEON_PP_TXFILTER_2, 5 ) );
		OUT_RING( tex[2].pp_txfilter );
		OUT_RING( tex[2].pp_txformat );
		OUT_RING( tex[2].pp_txoffset );
		OUT_RING( tex[2].pp_txcblend );
		OUT_RING( tex[2].pp_txablend );
		OUT_RING( tex[2].pp_tfactor );
		OUT_RING( CP_PACKET0( RADEON_PP_BORDER_COLOR_2, 0 ) );
		OUT_RING( tex[2].pp_border_color );
		ADVANCE_RING();
	}
}

/* Emit 1.2 state
 */
static void radeon_emit_state2( drm_radeon_private_t *dev_priv,
				drm_radeon_state_t *state )
{
	RING_LOCALS;

	if (state->dirty & RADEON_UPLOAD_ZBIAS) {
		BEGIN_RING( 3 );
		OUT_RING( CP_PACKET0( RADEON_SE_ZBIAS_FACTOR, 1 ) );
		OUT_RING( state->context2.se_zbias_factor ); 
		OUT_RING( state->context2.se_zbias_constant ); 
		ADVANCE_RING();
	}

	radeon_emit_state( dev_priv, &state->context, 
			   state->tex, state->dirty );
}

/* New (1.3) state mechanism.  3 commands (packet, scalar, vector) in
 * 1.3 cmdbuffers allow all previous state to be updated as well as
 * the tcl scalar and vector areas.  
 */
static struct { 
	int start; 
	int len; 
	const char *name;
} packet[RADEON_MAX_STATE_PACKETS] = {
	{ RADEON_PP_MISC,7,"RADEON_PP_MISC" },
	{ RADEON_PP_CNTL,3,"RADEON_PP_CNTL" },
	{ RADEON_RB3D_COLORPITCH,1,"RADEON_RB3D_COLORPITCH" },
	{ RADEON_RE_LINE_PATTERN,2,"RADEON_RE_LINE_PATTERN" },
	{ RADEON_SE_LINE_WIDTH,1,"RADEON_SE_LINE_WIDTH" },
	{ RADEON_PP_LUM_MATRIX,1,"RADEON_PP_LUM_MATRIX" },
	{ RADEON_PP_ROT_MATRIX_0,2,"RADEON_PP_ROT_MATRIX_0" },
	{ RADEON_RB3D_STENCILREFMASK,3,"RADEON_RB3D_STENCILREFMASK" },
	{ RADEON_SE_VPORT_XSCALE,6,"RADEON_SE_VPORT_XSCALE" },
	{ RADEON_SE_CNTL,2,"RADEON_SE_CNTL" },
	{ RADEON_SE_CNTL_STATUS,1,"RADEON_SE_CNTL_STATUS" },
	{ RADEON_RE_MISC,1,"RADEON_RE_MISC" },
	{ RADEON_PP_TXFILTER_0,6,"RADEON_PP_TXFILTER_0" },
	{ RADEON_PP_BORDER_COLOR_0,1,"RADEON_PP_BORDER_COLOR_0" },
	{ RADEON_PP_TXFILTER_1,6,"RADEON_PP_TXFILTER_1" },
	{ RADEON_PP_BORDER_COLOR_1,1,"RADEON_PP_BORDER_COLOR_1" },
	{ RADEON_PP_TXFILTER_2,6,"RADEON_PP_TXFILTER_2" },
	{ RADEON_PP_BORDER_COLOR_2,1,"RADEON_PP_BORDER_COLOR_2" },
	{ RADEON_SE_ZBIAS_FACTOR,2,"RADEON_SE_ZBIAS_FACTOR" },
	{ RADEON_SE_TCL_OUTPUT_VTX_FMT,11,"RADEON_SE_TCL_OUTPUT_VTX_FMT" },
	{ RADEON_SE_TCL_MATERIAL_EMMISSIVE_RED,17,"RADEON_SE_TCL_MATERIAL_EMMISSIVE_RED" },
	{ R200_PP_TXCBLEND_0, 4, "R200_PP_TXCBLEND_0" },
	{ R200_PP_TXCBLEND_1, 4, "R200_PP_TXCBLEND_1" },
	{ R200_PP_TXCBLEND_2, 4, "R200_PP_TXCBLEND_2" },
	{ R200_PP_TXCBLEND_3, 4, "R200_PP_TXCBLEND_3" },
	{ R200_PP_TXCBLEND_4, 4, "R200_PP_TXCBLEND_4" },
	{ R200_PP_TXCBLEND_5, 4, "R200_PP_TXCBLEND_5" },
	{ R200_PP_TXCBLEND_6, 4, "R200_PP_TXCBLEND_6" },
	{ R200_PP_TXCBLEND_7, 4, "R200_PP_TXCBLEND_7" },
	{ R200_SE_TCL_LIGHT_MODEL_CTL_0, 6, "R200_SE_TCL_LIGHT_MODEL_CTL_0" },
	{ R200_PP_TFACTOR_0, 6, "R200_PP_TFACTOR_0" },
	{ R200_SE_VTX_FMT_0, 4, "R200_SE_VTX_FMT_0" },
	{ R200_SE_VAP_CNTL, 1, "R200_SE_VAP_CNTL" },
	{ R200_SE_TCL_MATRIX_SEL_0, 5, "R200_SE_TCL_MATRIX_SEL_0" },
	{ R200_SE_TCL_TEX_PROC_CTL_2, 5, "R200_SE_TCL_TEX_PROC_CTL_2" },
	{ R200_SE_TCL_UCP_VERT_BLEND_CTL, 1, "R200_SE_TCL_UCP_VERT_BLEND_CTL" },
	{ R200_PP_TXFILTER_0, 6, "R200_PP_TXFILTER_0" },
	{ R200_PP_TXFILTER_1, 6, "R200_PP_TXFILTER_1" },
	{ R200_PP_TXFILTER_2, 6, "R200_PP_TXFILTER_2" },
	{ R200_PP_TXFILTER_3, 6, "R200_PP_TXFILTER_3" },
	{ R200_PP_TXFILTER_4, 6, "R200_PP_TXFILTER_4" },
	{ R200_PP_TXFILTER_5, 6, "R200_PP_TXFILTER_5" },
	{ R200_PP_TXOFFSET_0, 1, "R200_PP_TXOFFSET_0" },
	{ R200_PP_TXOFFSET_1, 1, "R200_PP_TXOFFSET_1" },
	{ R200_PP_TXOFFSET_2, 1, "R200_PP_TXOFFSET_2" },
	{ R200_PP_TXOFFSET_3, 1, "R200_PP_TXOFFSET_3" },
	{ R200_PP_TXOFFSET_4, 1, "R200_PP_TXOFFSET_4" },
	{ R200_PP_TXOFFSET_5, 1, "R200_PP_TXOFFSET_5" },
	{ R200_SE_VTE_CNTL, 1, "R200_SE_VTE_CNTL" },
	{ R200_SE_TCL_OUTPUT_VTX_COMP_SEL, 1, "R200_SE_TCL_OUTPUT_VTX_COMP_SEL" },
	{ R200_PP_TAM_DEBUG3, 1, "R200_PP_TAM_DEBUG3" },
	{ R200_PP_CNTL_X, 1, "R200_PP_CNTL_X" }, 
	{ R200_RB3D_DEPTHXY_OFFSET, 1, "R200_RB3D_DEPTHXY_OFFSET" }, 
	{ R200_RE_AUX_SCISSOR_CNTL, 1, "R200_RE_AUX_SCISSOR_CNTL" }, 
	{ R200_RE_SCISSOR_TL_0, 2, "R200_RE_SCISSOR_TL_0" }, 
	{ R200_RE_SCISSOR_TL_1, 2, "R200_RE_SCISSOR_TL_1" }, 
	{ R200_RE_SCISSOR_TL_2, 2, "R200_RE_SCISSOR_TL_2" }, 
	{ R200_SE_VAP_CNTL_STATUS, 1, "R200_SE_VAP_CNTL_STATUS" }, 
	{ R200_SE_VTX_STATE_CNTL, 1, "R200_SE_VTX_STATE_CNTL" }, 
	{ R200_RE_POINTSIZE, 1, "R200_RE_POINTSIZE" }, 
	{ R200_SE_TCL_INPUT_VTX_VECTOR_ADDR_0, 4, "R200_SE_TCL_INPUT_VTX_VECTOR_ADDR_0" },
	{ R200_PP_CUBIC_FACES_0, 1, "R200_PP_CUBIC_FACES_0" }, /* 61 */
	{ R200_PP_CUBIC_OFFSET_F1_0, 5, "R200_PP_CUBIC_OFFSET_F1_0" }, /* 62 */
	{ R200_PP_CUBIC_FACES_1, 1, "R200_PP_CUBIC_FACES_1" },
	{ R200_PP_CUBIC_OFFSET_F1_1, 5, "R200_PP_CUBIC_OFFSET_F1_1" },
	{ R200_PP_CUBIC_FACES_2, 1, "R200_PP_CUBIC_FACES_2" },
	{ R200_PP_CUBIC_OFFSET_F1_2, 5, "R200_PP_CUBIC_OFFSET_F1_2" },
	{ R200_PP_CUBIC_FACES_3, 1, "R200_PP_CUBIC_FACES_3" },
	{ R200_PP_CUBIC_OFFSET_F1_3, 5, "R200_PP_CUBIC_OFFSET_F1_3" },
	{ R200_PP_CUBIC_FACES_4, 1, "R200_PP_CUBIC_FACES_4" },
	{ R200_PP_CUBIC_OFFSET_F1_4, 5, "R200_PP_CUBIC_OFFSET_F1_4" },
	{ R200_PP_CUBIC_FACES_5, 1, "R200_PP_CUBIC_FACES_5" },
	{ R200_PP_CUBIC_OFFSET_F1_5, 5, "R200_PP_CUBIC_OFFSET_F1_5" },
};



/* ================================================================
 * Performance monitoring functions
 */

static void radeon_clear_box( drm_radeon_private_t *dev_priv,
			      int x, int y, int w, int h,
			      int r, int g, int b )
{
	u32 color;
	RING_LOCALS;

	x += dev_priv->sarea_priv->boxes[0].x1;
	y += dev_priv->sarea_priv->boxes[0].y1;

	switch ( dev_priv->color_fmt ) {
	case RADEON_COLOR_FORMAT_RGB565:
		color = (((r & 0xf8) << 8) |
			 ((g & 0xfc) << 3) |
			 ((b & 0xf8) >> 3));
		break;
	case RADEON_COLOR_FORMAT_ARGB8888:
	default:
		color = (((0xff) << 24) | (r << 16) | (g <<  8) | b);
		break;
	}

	BEGIN_RING( 4 );
	RADEON_WAIT_UNTIL_3D_IDLE();		
	OUT_RING( CP_PACKET0( RADEON_DP_WRITE_MASK, 0 ) );
	OUT_RING( 0xffffffff );
	ADVANCE_RING();

	BEGIN_RING( 6 );

	OUT_RING( CP_PACKET3( RADEON_CNTL_PAINT_MULTI, 4 ) );
	OUT_RING( RADEON_GMC_DST_PITCH_OFFSET_CNTL |
		  RADEON_GMC_BRUSH_SOLID_COLOR |
		  (dev_priv->color_fmt << 8) |
		  RADEON_GMC_SRC_DATATYPE_COLOR |
		  RADEON_ROP3_P |
		  RADEON_GMC_CLR_CMP_CNTL_DIS );

 	if ( dev_priv->page_flipping && dev_priv->current_page == 1 ) { 
		OUT_RING( dev_priv->front_pitch_offset );
 	} else {	 
		OUT_RING( dev_priv->back_pitch_offset );
 	} 

	OUT_RING( color );

	OUT_RING( (x << 16) | y );
	OUT_RING( (w << 16) | h );

	ADVANCE_RING();
}

static void radeon_cp_performance_boxes( drm_radeon_private_t *dev_priv )
{
	/* Collapse various things into a wait flag -- trying to
	 * guess if userspase slept -- better just to have them tell us.
	 */
	if (dev_priv->stats.last_frame_reads > 1 ||
	    dev_priv->stats.last_clear_reads > dev_priv->stats.clears) {
		dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
	}

	if (dev_priv->stats.freelist_loops) {
		dev_priv->stats.boxes |= RADEON_BOX_WAIT_IDLE;
	}

	/* Purple box for page flipping
	 */
	if ( dev_priv->stats.boxes & RADEON_BOX_FLIP ) 
		radeon_clear_box( dev_priv, 4, 4, 8, 8, 255, 0, 255 );

	/* Red box if we have to wait for idle at any point
	 */
	if ( dev_priv->stats.boxes & RADEON_BOX_WAIT_IDLE ) 
		radeon_clear_box( dev_priv, 16, 4, 8, 8, 255, 0, 0 );

	/* Blue box: lost context?
	 */

	/* Yellow box for texture swaps
	 */
	if ( dev_priv->stats.boxes & RADEON_BOX_TEXTURE_LOAD ) 
		radeon_clear_box( dev_priv, 40, 4, 8, 8, 255, 255, 0 );

	/* Green box if hardware never idles (as far as we can tell)
	 */
	if ( !(dev_priv->stats.boxes & RADEON_BOX_DMA_IDLE) ) 
		radeon_clear_box( dev_priv, 64, 4, 8, 8, 0, 255, 0 );


	/* Draw bars indicating number of buffers allocated 
	 * (not a great measure, easily confused)
	 */
	if (dev_priv->stats.requested_bufs) {
		if (dev_priv->stats.requested_bufs > 100)
			dev_priv->stats.requested_bufs = 100;

		radeon_clear_box( dev_priv, 4, 16,  
				  dev_priv->stats.requested_bufs, 4,
				  196, 128, 128 );
	}

	memset( &dev_priv->stats, 0, sizeof(dev_priv->stats) );

}
/* ================================================================
 * CP command dispatch functions
 */

static void radeon_cp_dispatch_clear( drm_device_t *dev,
				      drm_radeon_clear_t *clear,
				      drm_radeon_clear_rect_t *depth_boxes )
{
	drm_radeon_private_t *dev_priv = dev->dev_private;
	drm_radeon_sarea_t *sarea_priv = dev_priv->sarea_priv;
	drm_radeon_depth_clear_t *depth_clear = &dev_priv->depth_clear;
	int nbox = sarea_priv->nbox;
	drm_clip_rect_t *pbox = sarea_priv->boxes;
	unsigned int flags = clear->flags;
	u32 rb3d_cntl = 0, rb3d_stencilrefmask= 0;
	int i;
	RING_LOCALS;
	DRM_DEBUG( "flags = 0x%x\n", flags );

	dev_priv->stats.clears++;

	if ( dev_priv->page_flipping && dev_priv->current_page == 1 ) {
		unsigned int tmp = flags;

		flags &= ~(RADEON_FRONT | RADEON_BACK);
		if ( tmp & RADEON_FRONT ) flags |= RADEON_BACK;
		if ( tmp & RADEON_BACK )  flags |= RADEON_FRONT;
	}

	if ( flags & (RADEON_FRONT | RADEON_BACK) ) {

		BEGIN_RING( 4 );

		/* Ensure the 3D stream is idle before doing a
		 * 2D fill to clear the front or back buffer.
		 */
		RADEON_WAIT_UNTIL_3D_IDLE();
		
		OUT_RING( CP_PACKET0( RADEON_DP_WRITE_MASK, 0 ) );
		OUT_RING( clear->color_mask );

		ADVANCE_RING();

		/* Make sure we restore the 3D state next time.
		 */
		dev_priv->sarea_priv->ctx_owner = 0;

		for ( i = 0 ; i < nbox ; i++ ) {
			int x = pbox[i].x1;
			int y = pbox[i].y1;
			int w = pbox[i].x2 - x;
			int h = pbox[i].y2 - y;

			DRM_DEBUG( "dispatch clear %d,%d-%d,%d flags 0x%x\n",
				   x, y, w, h, flags );

			if ( flags & RADEON_FRONT ) {
				BEGIN_RING( 6 );
				
				OUT_RING( CP_PACKET3( RADEON_CNTL_PAINT_MULTI, 4 ) );
				OUT_RING( RADEON_GMC_DST_PITCH_OFFSET_CNTL |
					  RADEON_GMC_BRUSH_SOLID_COLOR |
					  (dev_priv->color_fmt << 8) |
					  RADEON_GMC_SRC_DATATYPE_COLOR |
					  RADEON_ROP3_P |
					  RADEON_GMC_CLR_CMP_CNTL_DIS );

				OUT_RING( dev_priv->front_pitch_offset );
				OUT_RING( clear->clear_color );
				
				OUT_RING( (x << 16) | y );
				OUT_RING( (w << 16) | h );
				
				ADVANCE_RING();
			}
			
			if ( flags & RADEON_BACK ) {
				BEGIN_RING( 6 );
				
				OUT_RING( CP_PACKET3( RADEON_CNTL_PAINT_MULTI, 4 ) );
				OUT_RING( RADEON_GMC_DST_PITCH_OFFSET_CNTL |
					  RADEON_GMC_BRUSH_SOLID_COLOR |
					  (dev_priv->color_fmt << 8) |
					  RADEON_GMC_SRC_DATATYPE_COLOR |
					  RADEON_ROP3_P |
					  RADEON_GMC_CLR_CMP_CNTL_DIS );
				
				OUT_RING( dev_priv->back_pitch_offset );
				OUT_RING( clear->clear_color );

				OUT_RING( (x << 16) | y );
				OUT_RING( (w << 16) | h );

				ADVANCE_RING();
			}
		}
	}

	/* We have to clear the depth and/or stencil buffers by
	 * rendering a quad into just those buffers.  Thus, we have to
	 * make sure the 3D engine is configured correctly.
	 */
	if ( dev_priv->is_r200 &&
	     (flags & (RADEON_DEPTH | RADEON_STENCIL)) ) {

		int tempPP_CNTL;
		int tempRE_CNTL;
		int tempRB3D_CNTL;
		int tempRB3D_ZSTENCILCNTL;
		int tempRB3D_STENCILREFMASK;
		int tempRB3D_PLANEMASK;
		int tempSE_CNTL;
		int tempSE_VTE_CNTL;
		int tempSE_VTX_FMT_0;
		int tempSE_VTX_FMT_1;
		int tempSE_VAP_CNTL;
		int tempRE_AUX_SCISSOR_CNTL;

		tempPP_CNTL = 0;
		tempRE_CNTL = 0;

		tempRB3D_CNTL = depth_clear->rb3d_cntl;
		tempRB3D_CNTL &= ~(1<<15); /* unset radeon magic flag */

		tempRB3D_ZSTENCILCNTL = depth_clear->rb3d_zstencilcntl;
		tempRB3D_STENCILREFMASK = 0x0;

		tempSE_CNTL = depth_clear->se_cntl;



		/* Disable TCL */

		tempSE_VAP_CNTL = (/* SE_VAP_CNTL__FORCE_W_TO_ONE_MASK |  */
				   (0x9 << SE_VAP_CNTL__VF_MAX_VTX_NUM__SHIFT));

		tempRB3D_PLANEMASK = 0x0;

		tempRE_AUX_SCISSOR_CNTL = 0x0;

		tempSE_VTE_CNTL =
			SE_VTE_CNTL__VTX_XY_FMT_MASK |
			SE_VTE_CNTL__VTX_Z_FMT_MASK;

		/* Vertex format (X, Y, Z, W)*/