src/mesa/drivers/dri/i965/brw_draw.c - fp2-dev/platform/external/mesa3d - Gitiles

 /**************************************************************************
  *
  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
  * 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, sub license, 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 NON-INFRINGEMENT.
  * IN NO EVENT SHALL TUNGSTEN GRAPHICS 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.
  *
  **************************************************************************/


 #include "main/glheader.h"
 #include "main/context.h"
 #include "main/state.h"
 #include "main/enums.h"
 #include "tnl/tnl.h"
 #include "vbo/vbo_context.h"
 #include "swrast/swrast.h"
 #include "swrast_setup/swrast_setup.h"

 #include "brw_draw.h"
 #include "brw_defines.h"
 #include "brw_context.h"
 #include "brw_state.h"
 #include "brw_fallback.h"

 #include "intel_batchbuffer.h"
 #include "intel_buffer_objects.h"

 #define FILE_DEBUG_FLAG DEBUG_BATCH

 static GLuint prim_to_hw_prim[GL_POLYGON+1] = {
    _3DPRIM_POINTLIST,
    _3DPRIM_LINELIST,
    _3DPRIM_LINELOOP,
    _3DPRIM_LINESTRIP,
    _3DPRIM_TRILIST,
    _3DPRIM_TRISTRIP,
    _3DPRIM_TRIFAN,
    _3DPRIM_QUADLIST,
    _3DPRIM_QUADSTRIP,
    _3DPRIM_POLYGON
 };


 static const GLenum reduced_prim[GL_POLYGON+1] = {
    GL_POINTS,
    GL_LINES,
    GL_LINES,
    GL_LINES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_TRIANGLES,
    GL_TRIANGLES
 };


 /* When the primitive changes, set a state bit and re-validate.  Not
  * the nicest and would rather deal with this by having all the
  * programs be immune to the active primitive (ie. cope with all
  * possibilities).  That may not be realistic however.
  */
 static GLuint brw_set_prim(struct brw_context *brw, GLenum prim)
 {
    GLcontext *ctx = &brw->intel.ctx;

    if (INTEL_DEBUG & DEBUG_PRIMS)
       _mesa_printf("PRIM: %s\n", _mesa_lookup_enum_by_nr(prim));

    /* Slight optimization to avoid the GS program when not needed:
     */
    if (prim == GL_QUAD_STRIP &&
        ctx->Light.ShadeModel != GL_FLAT &&
        ctx->Polygon.FrontMode == GL_FILL &&
        ctx->Polygon.BackMode == GL_FILL)
       prim = GL_TRIANGLE_STRIP;

    if (prim != brw->primitive) {
       brw->primitive = prim;
       brw->state.dirty.brw |= BRW_NEW_PRIMITIVE;

       if (reduced_prim[prim] != brw->intel.reduced_primitive) {
 	 brw->intel.reduced_primitive = reduced_prim[prim];
 	 brw->state.dirty.brw |= BRW_NEW_REDUCED_PRIMITIVE;
       }
    }

    return prim_to_hw_prim[prim];
 }


 static GLuint trim(GLenum prim, GLuint length)
 {
    if (prim == GL_QUAD_STRIP)
       return length > 3 ? (length - length % 2) : 0;
    else if (prim == GL_QUADS)
       return length - length % 4;
    else
       return length;
 }


 static void brw_emit_prim(struct brw_context *brw,
 			  const struct _mesa_prim *prim,
 			  uint32_t hw_prim)
 {
    struct brw_3d_primitive prim_packet;
    struct intel_context *intel = &brw->intel;

    if (INTEL_DEBUG & DEBUG_PRIMS)
       _mesa_printf("PRIM: %s %d %d\n", _mesa_lookup_enum_by_nr(prim->mode),
 		   prim->start, prim->count);

    prim_packet.header.opcode = CMD_3D_PRIM;
    prim_packet.header.length = sizeof(prim_packet)/4 - 2;
    prim_packet.header.pad = 0;
    prim_packet.header.topology = hw_prim;
    prim_packet.header.indexed = prim->indexed;

    prim_packet.verts_per_instance = trim(prim->mode, prim->count);
    prim_packet.start_vert_location = prim->start;
    if (prim->indexed)
       prim_packet.start_vert_location += brw->ib.start_vertex_offset;
    prim_packet.instance_count = 1;
    prim_packet.start_instance_location = 0;
    prim_packet.base_vert_location = prim->basevertex;

    /* Can't wrap here, since we rely on the validated state. */
    brw->no_batch_wrap = GL_TRUE;

    /* If we're set to always flush, do it before and after the primitive emit.
     * We want to catch both missed flushes that hurt instruction/state cache
     * and missed flushes of the render cache as it heads to other parts of
     * the besides the draw code.
     */
    if (intel->always_flush_cache) {
       BEGIN_BATCH(1, IGNORE_CLIPRECTS);
       OUT_BATCH(intel->vtbl.flush_cmd());
       ADVANCE_BATCH();
    }
    if (prim_packet.verts_per_instance) {
       intel_batchbuffer_data( brw->intel.batch, &prim_packet,
 			      sizeof(prim_packet), LOOP_CLIPRECTS);
    }
    if (intel->always_flush_cache) {
       BEGIN_BATCH(1, IGNORE_CLIPRECTS);
       OUT_BATCH(intel->vtbl.flush_cmd());
       ADVANCE_BATCH();
    }

    brw->no_batch_wrap = GL_FALSE;
 }

 static void brw_merge_inputs( struct brw_context *brw,
 		       const struct gl_client_array *arrays[])
 {
    struct brw_vertex_info old = brw->vb.info;
    GLuint i;

    for (i = 0; i < VERT_ATTRIB_MAX; i++)
       dri_bo_unreference(brw->vb.inputs[i].bo);

    memset(&brw->vb.inputs, 0, sizeof(brw->vb.inputs));
    memset(&brw->vb.info, 0, sizeof(brw->vb.info));

    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
       brw->vb.inputs[i].glarray = arrays[i];
       brw->vb.inputs[i].attrib = (gl_vert_attrib) i;

       if (arrays[i]->StrideB != 0)
 	 brw->vb.info.sizes[i/16] |= (brw->vb.inputs[i].glarray->Size - 1) <<
 	    ((i%16) * 2);
    }

    /* Raise statechanges if input sizes have changed. */
    if (memcmp(brw->vb.info.sizes, old.sizes, sizeof(old.sizes)) != 0)
       brw->state.dirty.brw |= BRW_NEW_INPUT_DIMENSIONS;
 }

 /* XXX: could split the primitive list to fallback only on the
  * non-conformant primitives.
  */
 static GLboolean check_fallbacks( struct brw_context *brw,
 				  const struct _mesa_prim *prim,
 				  GLuint nr_prims )
 {
    GLcontext *ctx = &brw->intel.ctx;
    GLuint i;

    /* If we don't require strict OpenGL conformance, never
     * use fallbacks.  If we're forcing fallbacks, always
     * use fallfacks.
     */
    if (brw->intel.conformance_mode == 0)
       return GL_FALSE;

    if (brw->intel.conformance_mode == 2)
       return GL_TRUE;

    if (ctx->Polygon.SmoothFlag) {
       for (i = 0; i < nr_prims; i++)
 	 if (reduced_prim[prim[i].mode] == GL_TRIANGLES)
 	    return GL_TRUE;
    }

    /* BRW hardware will do AA lines, but they are non-conformant it
     * seems.  TBD whether we keep this fallback:
     */
    if (ctx->Line.SmoothFlag) {
       for (i = 0; i < nr_prims; i++)
 	 if (reduced_prim[prim[i].mode] == GL_LINES)
 	    return GL_TRUE;
    }

    /* Stipple -- these fallbacks could be resolved with a little
     * bit of work?
     */
    if (ctx->Line.StippleFlag) {
       for (i = 0; i < nr_prims; i++) {
 	 /* GS doesn't get enough information to know when to reset
 	  * the stipple counter?!?
 	  */
 	 if (prim[i].mode == GL_LINE_LOOP || prim[i].mode == GL_LINE_STRIP)
 	    return GL_TRUE;

 	 if (prim[i].mode == GL_POLYGON &&
 	     (ctx->Polygon.FrontMode == GL_LINE ||
 	      ctx->Polygon.BackMode == GL_LINE))
 	    return GL_TRUE;
       }
    }

    if (ctx->Point.SmoothFlag) {
       for (i = 0; i < nr_prims; i++)
 	 if (prim[i].mode == GL_POINTS)
 	    return GL_TRUE;
    }

    /* BRW hardware doesn't handle GL_CLAMP texturing correctly;
     * brw_wm_sampler_state:translate_wrap_mode() treats GL_CLAMP
     * as GL_CLAMP_TO_EDGE instead.  If we're using GL_CLAMP, and
     * we want strict conformance, force the fallback.
     * Right now, we only do this for 2D textures.
     */
    {
       int u;
       for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
          struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u];
          if (texUnit->Enabled) {
             if (texUnit->Enabled & TEXTURE_1D_BIT) {
                if (texUnit->CurrentTex[TEXTURE_1D_INDEX]->WrapS == GL_CLAMP) {
                    return GL_TRUE;
                }
             }
             if (texUnit->Enabled & TEXTURE_2D_BIT) {
                if (texUnit->CurrentTex[TEXTURE_2D_INDEX]->WrapS == GL_CLAMP ||
                    texUnit->CurrentTex[TEXTURE_2D_INDEX]->WrapT == GL_CLAMP) {
                    return GL_TRUE;
                }
             }
             if (texUnit->Enabled & TEXTURE_3D_BIT) {
                if (texUnit->CurrentTex[TEXTURE_3D_INDEX]->WrapS == GL_CLAMP ||
                    texUnit->CurrentTex[TEXTURE_3D_INDEX]->WrapT == GL_CLAMP ||
                    texUnit->CurrentTex[TEXTURE_3D_INDEX]->WrapR == GL_CLAMP) {
                    return GL_TRUE;
                }
             }
          }
       }
    }

    /* Nothing stopping us from the fast path now */
    return GL_FALSE;
 }

 /* May fail if out of video memory for texture or vbo upload, or on
  * fallback conditions.
  */
 static GLboolean brw_try_draw_prims( GLcontext *ctx,
 				     const struct gl_client_array *arrays[],
 				     const struct _mesa_prim *prim,
 				     GLuint nr_prims,
 				     const struct _mesa_index_buffer *ib,
 				     GLuint min_index,
 				     GLuint max_index )
 {
    struct intel_context *intel = intel_context(ctx);
    struct brw_context *brw = brw_context(ctx);
    GLboolean retval = GL_FALSE;
    GLboolean warn = GL_FALSE;
    GLboolean first_time = GL_TRUE;
    GLuint i;

    if (ctx->NewState)
       _mesa_update_state( ctx );

    /* We have to validate the textures *before* checking for fallbacks;
     * otherwise, the software fallback won't be able to rely on the
     * texture state, the firstLevel and lastLevel fields won't be
     * set in the intel texture object (they'll both be 0), and the
     * software fallback will segfault if it attempts to access any
     * texture level other than level 0.
     */
    brw_validate_textures( brw );

    if (check_fallbacks(brw, prim, nr_prims))
       return GL_FALSE;

    /* Bind all inputs, derive varying and size information:
     */
    brw_merge_inputs( brw, arrays );

    brw->ib.ib = ib;
    brw->state.dirty.brw |= BRW_NEW_INDICES;

    brw->vb.min_index = min_index;
    brw->vb.max_index = max_index;
    brw->state.dirty.brw |= BRW_NEW_VERTICES;

    /* Have to validate state quite late.  Will rebuild tnl_program,
     * which depends on varying information.
     *
     * Note this is where brw->vs->prog_data.inputs_read is calculated,
     * so can't access it earlier.
     */

    LOCK_HARDWARE(intel);

    if (!intel->constant_cliprect && intel->driDrawable->numClipRects == 0) {
       UNLOCK_HARDWARE(intel);
       return GL_TRUE;
    }

    for (i = 0; i < nr_prims; i++) {
       uint32_t hw_prim;

       /* Flush the batch if it's approaching full, so that we don't wrap while
        * we've got validated state that needs to be in the same batch as the
        * primitives.  This fraction is just a guess (minimal full state plus
        * a primitive is around 512 bytes), and would be better if we had
        * an upper bound of how much we might emit in a single
        * brw_try_draw_prims().
        */
       intel_batchbuffer_require_space(intel->batch, intel->batch->size / 4,
 				      LOOP_CLIPRECTS);

       hw_prim = brw_set_prim(brw, prim[i].mode);

       if (first_time || (brw->state.dirty.brw & BRW_NEW_PRIMITIVE)) {
 	 first_time = GL_FALSE;

 	 brw_validate_state(brw);

 	 /* Various fallback checks:  */
 	 if (brw->intel.Fallback)
 	    goto out;

 	 /* Check that we can fit our state in with our existing batchbuffer, or
 	  * flush otherwise.
 	  */
 	 if (dri_bufmgr_check_aperture_space(brw->state.validated_bos,
 					     brw->state.validated_bo_count)) {
 	    static GLboolean warned;
 	    intel_batchbuffer_flush(intel->batch);

 	    /* Validate the state after we flushed the batch (which would have
 	     * changed the set of dirty state).  If we still fail to
 	     * check_aperture, warn of what's happening, but attempt to continue
 	     * on since it may succeed anyway, and the user would probably rather
 	     * see a failure and a warning than a fallback.
 	     */
 	    brw_validate_state(brw);
 	    if (!warned &&
 		dri_bufmgr_check_aperture_space(brw->state.validated_bos,
 						brw->state.validated_bo_count)) {
 	       warn = GL_TRUE;
 	       warned = GL_TRUE;
 	    }
 	 }

 	 brw_upload_state(brw);
       }

       brw_emit_prim(brw, &prim[i], hw_prim);

       retval = GL_TRUE;
    }

    if (intel->always_flush_batch)
       intel_batchbuffer_flush(intel->batch);
  out:
    UNLOCK_HARDWARE(intel);

    brw_state_cache_check_size(brw);

    if (warn)
       fprintf(stderr, "i965: Single primitive emit potentially exceeded "
 	      "available aperture space\n");

    if (!retval)
       DBG("%s failed\n", __FUNCTION__);

    return retval;
 }

 void brw_draw_prims( GLcontext *ctx,
 		     const struct gl_client_array *arrays[],
 		     const struct _mesa_prim *prim,
 		     GLuint nr_prims,
 		     const struct _mesa_index_buffer *ib,
 		     GLboolean index_bounds_valid,
 		     GLuint min_index,
 		     GLuint max_index )
 {
    GLboolean retval;

    if (!vbo_all_varyings_in_vbos(arrays)) {
       if (!index_bounds_valid)
 	 vbo_get_minmax_index(ctx, prim, ib, &min_index, &max_index);

       /* Decide if we want to rebase.  If so we end up recursing once
        * only into this function.
        */
       if (min_index != 0) {
 	 vbo_rebase_prims(ctx, arrays,
 			  prim, nr_prims,
 			  ib, min_index, max_index,
 			  brw_draw_prims );
 	 return;
       }
    }

    /* Make a first attempt at drawing:
     */
    retval = brw_try_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);

    /* Otherwise, we really are out of memory.  Pass the drawing
     * command to the software tnl module and which will in turn call
     * swrast to do the drawing.
     */
    if (!retval) {
        _swsetup_Wakeup(ctx);
       _tnl_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);
    }

 }

 void brw_draw_init( struct brw_context *brw )
 {
    GLcontext *ctx = &brw->intel.ctx;
    struct vbo_context *vbo = vbo_context(ctx);

    /* Register our drawing function:
     */
    vbo->draw_prims = brw_draw_prims;
 }

 void brw_draw_destroy( struct brw_context *brw )
 {
    int i;

    if (brw->vb.upload.bo != NULL) {
       dri_bo_unreference(brw->vb.upload.bo);
       brw->vb.upload.bo = NULL;
    }

    for (i = 0; i < VERT_ATTRIB_MAX; i++) {
       dri_bo_unreference(brw->vb.inputs[i].bo);
       brw->vb.inputs[i].bo = NULL;
    }

    dri_bo_unreference(brw->ib.bo);
    brw->ib.bo = NULL;
 }
	/**************************************************************************
	*
	* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
	* 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, sub license, 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 NON-INFRINGEMENT.
	* IN NO EVENT SHALL TUNGSTEN GRAPHICS 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.
	*
	**************************************************************************/


	#include "main/glheader.h"
	#include "main/context.h"
	#include "main/state.h"
	#include "main/enums.h"
	#include "tnl/tnl.h"
	#include "vbo/vbo_context.h"
	#include "swrast/swrast.h"
	#include "swrast_setup/swrast_setup.h"

	#include "brw_draw.h"
	#include "brw_defines.h"
	#include "brw_context.h"
	#include "brw_state.h"
	#include "brw_fallback.h"

	#include "intel_batchbuffer.h"
	#include "intel_buffer_objects.h"

	#define FILE_DEBUG_FLAG DEBUG_BATCH

	static GLuint prim_to_hw_prim[GL_POLYGON+1] = {
	_3DPRIM_POINTLIST,
	_3DPRIM_LINELIST,
	_3DPRIM_LINELOOP,
	_3DPRIM_LINESTRIP,
	_3DPRIM_TRILIST,
	_3DPRIM_TRISTRIP,
	_3DPRIM_TRIFAN,
	_3DPRIM_QUADLIST,
	_3DPRIM_QUADSTRIP,
	_3DPRIM_POLYGON
	};


	static const GLenum reduced_prim[GL_POLYGON+1] = {
	GL_POINTS,
	GL_LINES,
	GL_LINES,
	GL_LINES,
	GL_TRIANGLES,
	GL_TRIANGLES,
	GL_TRIANGLES,
	GL_TRIANGLES,
	GL_TRIANGLES,
	GL_TRIANGLES
	};


	/* When the primitive changes, set a state bit and re-validate. Not
	* the nicest and would rather deal with this by having all the
	* programs be immune to the active primitive (ie. cope with all
	* possibilities). That may not be realistic however.
	*/
	static GLuint brw_set_prim(struct brw_context *brw, GLenum prim)
	{
	GLcontext *ctx = &brw->intel.ctx;

	if (INTEL_DEBUG & DEBUG_PRIMS)
	_mesa_printf("PRIM: %s\n", _mesa_lookup_enum_by_nr(prim));

	/* Slight optimization to avoid the GS program when not needed:
	*/
	if (prim == GL_QUAD_STRIP &&
	ctx->Light.ShadeModel != GL_FLAT &&
	ctx->Polygon.FrontMode == GL_FILL &&
	ctx->Polygon.BackMode == GL_FILL)
	prim = GL_TRIANGLE_STRIP;

	if (prim != brw->primitive) {
	brw->primitive = prim;
	brw->state.dirty.brw \|= BRW_NEW_PRIMITIVE;

	if (reduced_prim[prim] != brw->intel.reduced_primitive) {
	brw->intel.reduced_primitive = reduced_prim[prim];
	brw->state.dirty.brw \|= BRW_NEW_REDUCED_PRIMITIVE;
	}
	}

	return prim_to_hw_prim[prim];
	}


	static GLuint trim(GLenum prim, GLuint length)
	{
	if (prim == GL_QUAD_STRIP)
	return length > 3 ? (length - length % 2) : 0;
	else if (prim == GL_QUADS)
	return length - length % 4;
	else
	return length;
	}


	static void brw_emit_prim(struct brw_context *brw,
	const struct _mesa_prim *prim,
	uint32_t hw_prim)
	{
	struct brw_3d_primitive prim_packet;
	struct intel_context *intel = &brw->intel;

	if (INTEL_DEBUG & DEBUG_PRIMS)
	_mesa_printf("PRIM: %s %d %d\n", _mesa_lookup_enum_by_nr(prim->mode),
	prim->start, prim->count);

	prim_packet.header.opcode = CMD_3D_PRIM;
	prim_packet.header.length = sizeof(prim_packet)/4 - 2;
	prim_packet.header.pad = 0;
	prim_packet.header.topology = hw_prim;
	prim_packet.header.indexed = prim->indexed;

	prim_packet.verts_per_instance = trim(prim->mode, prim->count);
	prim_packet.start_vert_location = prim->start;
	if (prim->indexed)
	prim_packet.start_vert_location += brw->ib.start_vertex_offset;
	prim_packet.instance_count = 1;
	prim_packet.start_instance_location = 0;
	prim_packet.base_vert_location = prim->basevertex;

	/* Can't wrap here, since we rely on the validated state. */
	brw->no_batch_wrap = GL_TRUE;

	/* If we're set to always flush, do it before and after the primitive emit.
	* We want to catch both missed flushes that hurt instruction/state cache
	* and missed flushes of the render cache as it heads to other parts of
	* the besides the draw code.
	*/
	if (intel->always_flush_cache) {
	BEGIN_BATCH(1, IGNORE_CLIPRECTS);
	OUT_BATCH(intel->vtbl.flush_cmd());
	ADVANCE_BATCH();
	}
	if (prim_packet.verts_per_instance) {
	intel_batchbuffer_data( brw->intel.batch, &prim_packet,
	sizeof(prim_packet), LOOP_CLIPRECTS);
	}
	if (intel->always_flush_cache) {
	BEGIN_BATCH(1, IGNORE_CLIPRECTS);
	OUT_BATCH(intel->vtbl.flush_cmd());
	ADVANCE_BATCH();
	}

	brw->no_batch_wrap = GL_FALSE;
	}

	static void brw_merge_inputs( struct brw_context *brw,
	const struct gl_client_array *arrays[])
	{
	struct brw_vertex_info old = brw->vb.info;
	GLuint i;

	for (i = 0; i < VERT_ATTRIB_MAX; i++)
	dri_bo_unreference(brw->vb.inputs[i].bo);

	memset(&brw->vb.inputs, 0, sizeof(brw->vb.inputs));
	memset(&brw->vb.info, 0, sizeof(brw->vb.info));

	for (i = 0; i < VERT_ATTRIB_MAX; i++) {
	brw->vb.inputs[i].glarray = arrays[i];
	brw->vb.inputs[i].attrib = (gl_vert_attrib) i;

	if (arrays[i]->StrideB != 0)
	brw->vb.info.sizes[i/16] \|= (brw->vb.inputs[i].glarray->Size - 1) <<
	((i%16) * 2);
	}

	/* Raise statechanges if input sizes have changed. */
	if (memcmp(brw->vb.info.sizes, old.sizes, sizeof(old.sizes)) != 0)
	brw->state.dirty.brw \|= BRW_NEW_INPUT_DIMENSIONS;
	}

	/* XXX: could split the primitive list to fallback only on the
	* non-conformant primitives.
	*/
	static GLboolean check_fallbacks( struct brw_context *brw,
	const struct _mesa_prim *prim,
	GLuint nr_prims )
	{
	GLcontext *ctx = &brw->intel.ctx;
	GLuint i;

	/* If we don't require strict OpenGL conformance, never
	* use fallbacks. If we're forcing fallbacks, always
	* use fallfacks.
	*/
	if (brw->intel.conformance_mode == 0)
	return GL_FALSE;

	if (brw->intel.conformance_mode == 2)
	return GL_TRUE;

	if (ctx->Polygon.SmoothFlag) {
	for (i = 0; i < nr_prims; i++)
	if (reduced_prim[prim[i].mode] == GL_TRIANGLES)
	return GL_TRUE;
	}

	/* BRW hardware will do AA lines, but they are non-conformant it
	* seems. TBD whether we keep this fallback:
	*/
	if (ctx->Line.SmoothFlag) {
	for (i = 0; i < nr_prims; i++)
	if (reduced_prim[prim[i].mode] == GL_LINES)
	return GL_TRUE;
	}

	/* Stipple -- these fallbacks could be resolved with a little
	* bit of work?
	*/
	if (ctx->Line.StippleFlag) {
	for (i = 0; i < nr_prims; i++) {
	/* GS doesn't get enough information to know when to reset
	* the stipple counter?!?
	*/
	if (prim[i].mode == GL_LINE_LOOP \|\| prim[i].mode == GL_LINE_STRIP)
	return GL_TRUE;

	if (prim[i].mode == GL_POLYGON &&
	(ctx->Polygon.FrontMode == GL_LINE \|\|
	ctx->Polygon.BackMode == GL_LINE))
	return GL_TRUE;
	}
	}

	if (ctx->Point.SmoothFlag) {
	for (i = 0; i < nr_prims; i++)
	if (prim[i].mode == GL_POINTS)
	return GL_TRUE;
	}

	/* BRW hardware doesn't handle GL_CLAMP texturing correctly;
	* brw_wm_sampler_state:translate_wrap_mode() treats GL_CLAMP
	* as GL_CLAMP_TO_EDGE instead. If we're using GL_CLAMP, and
	* we want strict conformance, force the fallback.
	* Right now, we only do this for 2D textures.
	*/
	{
	int u;
	for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
	struct gl_texture_unit *texUnit = &ctx->Texture.Unit[u];
	if (texUnit->Enabled) {
	if (texUnit->Enabled & TEXTURE_1D_BIT) {
	if (texUnit->CurrentTex[TEXTURE_1D_INDEX]->WrapS == GL_CLAMP) {
	return GL_TRUE;
	}
	}
	if (texUnit->Enabled & TEXTURE_2D_BIT) {
	if (texUnit->CurrentTex[TEXTURE_2D_INDEX]->WrapS == GL_CLAMP \|\|
	texUnit->CurrentTex[TEXTURE_2D_INDEX]->WrapT == GL_CLAMP) {
	return GL_TRUE;
	}
	}
	if (texUnit->Enabled & TEXTURE_3D_BIT) {
	if (texUnit->CurrentTex[TEXTURE_3D_INDEX]->WrapS == GL_CLAMP \|\|
	texUnit->CurrentTex[TEXTURE_3D_INDEX]->WrapT == GL_CLAMP \|\|
	texUnit->CurrentTex[TEXTURE_3D_INDEX]->WrapR == GL_CLAMP) {
	return GL_TRUE;
	}
	}
	}
	}
	}

	/* Nothing stopping us from the fast path now */
	return GL_FALSE;
	}

	/* May fail if out of video memory for texture or vbo upload, or on
	* fallback conditions.
	*/
	static GLboolean brw_try_draw_prims( GLcontext *ctx,
	const struct gl_client_array *arrays[],
	const struct _mesa_prim *prim,
	GLuint nr_prims,
	const struct _mesa_index_buffer *ib,
	GLuint min_index,
	GLuint max_index )
	{
	struct intel_context *intel = intel_context(ctx);
	struct brw_context *brw = brw_context(ctx);
	GLboolean retval = GL_FALSE;
	GLboolean warn = GL_FALSE;
	GLboolean first_time = GL_TRUE;
	GLuint i;

	if (ctx->NewState)
	_mesa_update_state( ctx );

	/* We have to validate the textures before checking for fallbacks;
	* otherwise, the software fallback won't be able to rely on the
	* texture state, the firstLevel and lastLevel fields won't be
	* set in the intel texture object (they'll both be 0), and the
	* software fallback will segfault if it attempts to access any
	* texture level other than level 0.
	*/
	brw_validate_textures( brw );

	if (check_fallbacks(brw, prim, nr_prims))
	return GL_FALSE;

	/* Bind all inputs, derive varying and size information:
	*/
	brw_merge_inputs( brw, arrays );

	brw->ib.ib = ib;
	brw->state.dirty.brw \|= BRW_NEW_INDICES;

	brw->vb.min_index = min_index;
	brw->vb.max_index = max_index;
	brw->state.dirty.brw \|= BRW_NEW_VERTICES;

	/* Have to validate state quite late. Will rebuild tnl_program,
	* which depends on varying information.
	*
	* Note this is where brw->vs->prog_data.inputs_read is calculated,
	* so can't access it earlier.
	*/

	LOCK_HARDWARE(intel);

	if (!intel->constant_cliprect && intel->driDrawable->numClipRects == 0) {
	UNLOCK_HARDWARE(intel);
	return GL_TRUE;
	}

	for (i = 0; i < nr_prims; i++) {
	uint32_t hw_prim;

	/* Flush the batch if it's approaching full, so that we don't wrap while
	* we've got validated state that needs to be in the same batch as the
	* primitives. This fraction is just a guess (minimal full state plus
	* a primitive is around 512 bytes), and would be better if we had
	* an upper bound of how much we might emit in a single
	* brw_try_draw_prims().
	*/
	intel_batchbuffer_require_space(intel->batch, intel->batch->size / 4,
	LOOP_CLIPRECTS);

	hw_prim = brw_set_prim(brw, prim[i].mode);

	if (first_time \|\| (brw->state.dirty.brw & BRW_NEW_PRIMITIVE)) {
	first_time = GL_FALSE;

	brw_validate_state(brw);

	/* Various fallback checks: */
	if (brw->intel.Fallback)
	goto out;

	/* Check that we can fit our state in with our existing batchbuffer, or
	* flush otherwise.
	*/
	if (dri_bufmgr_check_aperture_space(brw->state.validated_bos,
	brw->state.validated_bo_count)) {
	static GLboolean warned;
	intel_batchbuffer_flush(intel->batch);

	/* Validate the state after we flushed the batch (which would have
	* changed the set of dirty state). If we still fail to
	* check_aperture, warn of what's happening, but attempt to continue
	* on since it may succeed anyway, and the user would probably rather
	* see a failure and a warning than a fallback.
	*/
	brw_validate_state(brw);
	if (!warned &&
	dri_bufmgr_check_aperture_space(brw->state.validated_bos,
	brw->state.validated_bo_count)) {
	warn = GL_TRUE;
	warned = GL_TRUE;
	}
	}

	brw_upload_state(brw);
	}

	brw_emit_prim(brw, &prim[i], hw_prim);

	retval = GL_TRUE;
	}

	if (intel->always_flush_batch)
	intel_batchbuffer_flush(intel->batch);
	out:
	UNLOCK_HARDWARE(intel);

	brw_state_cache_check_size(brw);

	if (warn)
	fprintf(stderr, "i965: Single primitive emit potentially exceeded "
	"available aperture space\n");

	if (!retval)
	DBG("%s failed\n", __FUNCTION__);

	return retval;
	}

	void brw_draw_prims( GLcontext *ctx,
	const struct gl_client_array *arrays[],
	const struct _mesa_prim *prim,
	GLuint nr_prims,
	const struct _mesa_index_buffer *ib,
	GLboolean index_bounds_valid,
	GLuint min_index,
	GLuint max_index )
	{
	GLboolean retval;

	if (!vbo_all_varyings_in_vbos(arrays)) {
	if (!index_bounds_valid)
	vbo_get_minmax_index(ctx, prim, ib, &min_index, &max_index);

	/* Decide if we want to rebase. If so we end up recursing once
	* only into this function.
	*/
	if (min_index != 0) {
	vbo_rebase_prims(ctx, arrays,
	prim, nr_prims,
	ib, min_index, max_index,
	brw_draw_prims );
	return;
	}
	}

	/* Make a first attempt at drawing:
	*/
	retval = brw_try_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);

	/* Otherwise, we really are out of memory. Pass the drawing
	* command to the software tnl module and which will in turn call
	* swrast to do the drawing.
	*/
	if (!retval) {
	_swsetup_Wakeup(ctx);
	_tnl_draw_prims(ctx, arrays, prim, nr_prims, ib, min_index, max_index);
	}

	}

	void brw_draw_init( struct brw_context *brw )
	{
	GLcontext *ctx = &brw->intel.ctx;
	struct vbo_context *vbo = vbo_context(ctx);

	/* Register our drawing function:
	*/
	vbo->draw_prims = brw_draw_prims;
	}

	void brw_draw_destroy( struct brw_context *brw )
	{
	int i;

	if (brw->vb.upload.bo != NULL) {
	dri_bo_unreference(brw->vb.upload.bo);
	brw->vb.upload.bo = NULL;
	}

	for (i = 0; i < VERT_ATTRIB_MAX; i++) {
	dri_bo_unreference(brw->vb.inputs[i].bo);
	brw->vb.inputs[i].bo = NULL;
	}

	dri_bo_unreference(brw->ib.bo);
	brw->ib.bo = NULL;
	}