src/gallium/drivers/svga/svga_swtnl_backend.c - third_party/mesa - Git at Google

 /**********************************************************
  * Copyright 2008-2009 VMware, Inc.  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 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 THE AUTHORS OR COPYRIGHT HOLDERS
  * 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 "draw/draw_vbuf.h"
 #include "draw/draw_context.h"
 #include "draw/draw_vertex.h"

 #include "util/u_debug.h"
 #include "util/u_inlines.h"
 #include "util/u_math.h"
 #include "util/u_memory.h"

 #include "svga_context.h"
 #include "svga_state.h"
 #include "svga_swtnl.h"

 #include "svga_types.h"
 #include "svga_reg.h"
 #include "svga3d_reg.h"
 #include "svga_draw.h"
 #include "svga_shader.h"
 #include "svga_swtnl_private.h"


 static const struct vertex_info *
 svga_vbuf_render_get_vertex_info(struct vbuf_render *render)
 {
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
    struct svga_context *svga = svga_render->svga;

    svga_swtnl_update_vdecl(svga);

    return &svga_render->vertex_info;
 }


 static boolean
 svga_vbuf_render_allocate_vertices(struct vbuf_render *render,
                                    ushort vertex_size,
                                    ushort nr_vertices)
 {
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
    struct svga_context *svga = svga_render->svga;
    struct pipe_screen *screen = svga->pipe.screen;
    size_t size = (size_t)nr_vertices * (size_t)vertex_size;
    boolean new_vbuf = FALSE;
    boolean new_ibuf = FALSE;

    SVGA_STATS_TIME_PUSH(svga_sws(svga),
                         SVGA_STATS_TIME_VBUFRENDERALLOCVERT);

    if (svga_render->vertex_size != vertex_size)
       svga->swtnl.new_vdecl = TRUE;
    svga_render->vertex_size = (size_t)vertex_size;

    if (svga->swtnl.new_vbuf)
       new_ibuf = new_vbuf = TRUE;
    svga->swtnl.new_vbuf = FALSE;

    if (svga_render->vbuf_size
        < svga_render->vbuf_offset + svga_render->vbuf_used + size)
       new_vbuf = TRUE;

    if (new_vbuf)
       pipe_resource_reference(&svga_render->vbuf, NULL);
    if (new_ibuf)
       pipe_resource_reference(&svga_render->ibuf, NULL);

    if (!svga_render->vbuf) {
       svga_render->vbuf_size = MAX2(size, svga_render->vbuf_alloc_size);
       svga_render->vbuf = pipe_buffer_create(screen,
                                              PIPE_BIND_VERTEX_BUFFER,
                                              PIPE_USAGE_STREAM,
                                              svga_render->vbuf_size);
       if (!svga_render->vbuf) {
          svga_context_flush(svga, NULL);
          assert(!svga_render->vbuf);
          svga_render->vbuf = pipe_buffer_create(screen,
                                                 PIPE_BIND_VERTEX_BUFFER,
                                                 PIPE_USAGE_STREAM,
                                                 svga_render->vbuf_size);
          /* The buffer allocation may fail if we run out of memory.
           * The draw module's vbuf code should handle that without crashing.
           */
       }

       svga->swtnl.new_vdecl = TRUE;
       svga_render->vbuf_offset = 0;
    } else {
       svga_render->vbuf_offset += svga_render->vbuf_used;
    }

    svga_render->vbuf_used = 0;

    if (svga->swtnl.new_vdecl)
       svga_render->vdecl_offset = svga_render->vbuf_offset;

    SVGA_STATS_TIME_POP(svga_sws(svga));

    return TRUE;
 }


 static void *
 svga_vbuf_render_map_vertices(struct vbuf_render *render)
 {
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
    struct svga_context *svga = svga_render->svga;
    void * retPtr = NULL;

    SVGA_STATS_TIME_PUSH(svga_sws(svga),
                         SVGA_STATS_TIME_VBUFRENDERMAPVERT);

    if (svga_render->vbuf) {
       char *ptr = (char*)pipe_buffer_map(&svga->pipe,
                                          svga_render->vbuf,
                                          PIPE_TRANSFER_WRITE |
                                          PIPE_TRANSFER_FLUSH_EXPLICIT |
                                          PIPE_TRANSFER_DISCARD_RANGE |
                                          PIPE_TRANSFER_UNSYNCHRONIZED,
                                          &svga_render->vbuf_transfer);
       if (ptr) {
          svga_render->vbuf_ptr = ptr;
          retPtr = ptr + svga_render->vbuf_offset;
       }
       else {
          svga_render->vbuf_ptr = NULL;
          svga_render->vbuf_transfer = NULL;
          retPtr = NULL;
       }
    }
    else {
       /* we probably ran out of memory when allocating the vertex buffer */
       retPtr = NULL;
    }

    SVGA_STATS_TIME_POP(svga_sws(svga));
    return retPtr;
 }


 static void
 svga_vbuf_render_unmap_vertices(struct vbuf_render *render,
                                 ushort min_index,
                                 ushort max_index)
 {
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
    struct svga_context *svga = svga_render->svga;
    unsigned offset, length;
    size_t used = svga_render->vertex_size * ((size_t)max_index + 1);

    SVGA_STATS_TIME_PUSH(svga_sws(svga),
                         SVGA_STATS_TIME_VBUFRENDERUNMAPVERT);

    offset = svga_render->vbuf_offset + svga_render->vertex_size * min_index;
    length = svga_render->vertex_size * (max_index + 1 - min_index);

    if (0) {
       /* dump vertex data */
       const float *f = (const float *) ((char *) svga_render->vbuf_ptr +
                                         svga_render->vbuf_offset);
       unsigned i;
       debug_printf("swtnl vertex data:\n");
       for (i = 0; i < length / 4; i += 4) {
          debug_printf("%u: %f %f %f %f\n", i, f[i], f[i+1], f[i+2], f[i+3]);
       }
    }

    pipe_buffer_flush_mapped_range(&svga->pipe,
                                   svga_render->vbuf_transfer,
                                   offset, length);
    pipe_buffer_unmap(&svga->pipe, svga_render->vbuf_transfer);
    svga_render->min_index = min_index;
    svga_render->max_index = max_index;
    svga_render->vbuf_used = MAX2(svga_render->vbuf_used, used);

    SVGA_STATS_TIME_POP(svga_sws(svga));
 }


 static void
 svga_vbuf_render_set_primitive(struct vbuf_render *render,
                                enum pipe_prim_type prim)
 {
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
    svga_render->prim = prim;
 }


 static void
 svga_vbuf_submit_state(struct svga_vbuf_render *svga_render)
 {
    struct svga_context *svga = svga_render->svga;
    SVGA3dVertexDecl vdecl[PIPE_MAX_ATTRIBS];
    enum pipe_error ret;
    unsigned i;
    static const unsigned zero[PIPE_MAX_ATTRIBS] = {0};

    /* if the vdecl or vbuf hasn't changed do nothing */
    if (!svga->swtnl.new_vdecl)
       return;

    SVGA_STATS_TIME_PUSH(svga_sws(svga),
                         SVGA_STATS_TIME_VBUFSUBMITSTATE);

    memcpy(vdecl, svga_render->vdecl, sizeof(vdecl));

    /* flush the hw state */
    ret = svga_hwtnl_flush(svga->hwtnl);
    if (ret != PIPE_OK) {
       svga_context_flush(svga, NULL);
       ret = svga_hwtnl_flush(svga->hwtnl);
       /* if we hit this path we might become synced with hw */
       svga->swtnl.new_vbuf = TRUE;
       assert(ret == PIPE_OK);
    }

    for (i = 0; i < svga_render->vdecl_count; i++) {
       vdecl[i].array.offset += svga_render->vdecl_offset;
    }

    svga_hwtnl_vertex_decls(svga->hwtnl,
                            svga_render->vdecl_count,
                            vdecl,
                            zero,
                            svga_render->layout_id);

    /* Specify the vertex buffer (there's only ever one) */
    {
       struct pipe_vertex_buffer vb;
       vb.is_user_buffer = false;
       vb.buffer.resource = svga_render->vbuf;
       vb.buffer_offset = svga_render->vdecl_offset;
       vb.stride = vdecl[0].array.stride;
       svga_hwtnl_vertex_buffers(svga->hwtnl, 1, &vb);
    }

    /* We have already taken care of flatshading, so let the hwtnl
     * module use whatever is most convenient:
     */
    if (svga->state.sw.need_pipeline) {
       svga_hwtnl_set_flatshade(svga->hwtnl, FALSE, FALSE);
       svga_hwtnl_set_fillmode(svga->hwtnl, PIPE_POLYGON_MODE_FILL);
    }
    else {
       svga_hwtnl_set_flatshade(svga->hwtnl,
                                 svga->curr.rast->templ.flatshade ||
                                 svga->state.hw_draw.fs->uses_flat_interp,
                                 svga->curr.rast->templ.flatshade_first);

       svga_hwtnl_set_fillmode(svga->hwtnl, svga->curr.rast->hw_fillmode);
    }

    svga->swtnl.new_vdecl = FALSE;
    SVGA_STATS_TIME_POP(svga_sws(svga));
 }


 static void
 svga_vbuf_render_draw_arrays(struct vbuf_render *render,
                               unsigned start, uint nr)
 {
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
    struct svga_context *svga = svga_render->svga;
    unsigned bias = (svga_render->vbuf_offset - svga_render->vdecl_offset)
       / svga_render->vertex_size;
    enum pipe_error ret = PIPE_OK;
    /* instancing will already have been resolved at this point by 'draw' */
    const unsigned start_instance = 0;
    const unsigned instance_count = 1;

    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_VBUFDRAWARRAYS);

    /* off to hardware */
    svga_vbuf_submit_state(svga_render);

    /* Need to call update_state() again as the draw module may have
     * altered some of our state behind our backs.  Testcase:
     * redbook/polys.c
     */
    svga_update_state_retry(svga, SVGA_STATE_HW_DRAW);

    ret = svga_hwtnl_draw_arrays(svga->hwtnl, svga_render->prim, start + bias,
                                  nr, start_instance, instance_count);
    if (ret != PIPE_OK) {
       svga_context_flush(svga, NULL);
       ret = svga_hwtnl_draw_arrays(svga->hwtnl, svga_render->prim,
                                    start + bias, nr,
                                    start_instance, instance_count);
       svga->swtnl.new_vbuf = TRUE;
       assert(ret == PIPE_OK);
    }
    SVGA_STATS_TIME_POP(svga_sws(svga));
 }


 static void
 svga_vbuf_render_draw_elements(struct vbuf_render *render,
                                 const ushort *indices,
                                 uint nr_indices)
 {
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
    struct svga_context *svga = svga_render->svga;
    struct pipe_screen *screen = svga->pipe.screen;
    int bias = (svga_render->vbuf_offset - svga_render->vdecl_offset)
       / svga_render->vertex_size;
    boolean ret;
    size_t size = 2 * nr_indices;
    /* instancing will already have been resolved at this point by 'draw' */
    const unsigned start_instance = 0;
    const unsigned instance_count = 1;

    assert((svga_render->vbuf_offset - svga_render->vdecl_offset)
           % svga_render->vertex_size == 0);

    SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_VBUFDRAWELEMENTS);

    if (svga_render->ibuf_size < svga_render->ibuf_offset + size)
       pipe_resource_reference(&svga_render->ibuf, NULL);

    if (!svga_render->ibuf) {
       svga_render->ibuf_size = MAX2(size, svga_render->ibuf_alloc_size);
       svga_render->ibuf = pipe_buffer_create(screen,
                                              PIPE_BIND_INDEX_BUFFER,
                                              PIPE_USAGE_STREAM,
                                              svga_render->ibuf_size);
       svga_render->ibuf_offset = 0;
    }

    pipe_buffer_write_nooverlap(&svga->pipe, svga_render->ibuf,
                                svga_render->ibuf_offset, 2 * nr_indices,
                                indices);

    /* off to hardware */
    svga_vbuf_submit_state(svga_render);

    /* Need to call update_state() again as the draw module may have
     * altered some of our state behind our backs.  Testcase:
     * redbook/polys.c
     */
    svga_update_state_retry(svga, SVGA_STATE_HW_DRAW);

    ret = svga_hwtnl_draw_range_elements(svga->hwtnl,
                                         svga_render->ibuf,
                                         2,
                                         bias,
                                         svga_render->min_index,
                                         svga_render->max_index,
                                         svga_render->prim,
                                         svga_render->ibuf_offset / 2,
                                         nr_indices,
                                         start_instance, instance_count);
    if (ret != PIPE_OK) {
       svga_context_flush(svga, NULL);
       ret = svga_hwtnl_draw_range_elements(svga->hwtnl,
                                            svga_render->ibuf,
                                            2,
                                            bias,
                                            svga_render->min_index,
                                            svga_render->max_index,
                                            svga_render->prim,
                                            svga_render->ibuf_offset / 2,
                                            nr_indices,
                                            start_instance, instance_count);
       svga->swtnl.new_vbuf = TRUE;
       assert(ret == PIPE_OK);
    }
    svga_render->ibuf_offset += size;

    SVGA_STATS_TIME_POP(svga_sws(svga));
 }


 static void
 svga_vbuf_render_release_vertices(struct vbuf_render *render)
 {

 }


 static void
 svga_vbuf_render_destroy(struct vbuf_render *render)
 {
    struct svga_vbuf_render *svga_render = svga_vbuf_render(render);

    pipe_resource_reference(&svga_render->vbuf, NULL);
    pipe_resource_reference(&svga_render->ibuf, NULL);
    FREE(svga_render);
 }


 /**
  * Create a new primitive render.
  */
 struct vbuf_render *
 svga_vbuf_render_create(struct svga_context *svga)
 {
    struct svga_vbuf_render *svga_render = CALLOC_STRUCT(svga_vbuf_render);

    svga_render->svga = svga;
    svga_render->ibuf_size = 0;
    svga_render->vbuf_size = 0;
    svga_render->ibuf_alloc_size = 4*1024;
    svga_render->vbuf_alloc_size = 64*1024;
    svga_render->layout_id = SVGA3D_INVALID_ID;
    svga_render->base.max_vertex_buffer_bytes = 64*1024/10;
    svga_render->base.max_indices = 65536;
    svga_render->base.get_vertex_info = svga_vbuf_render_get_vertex_info;
    svga_render->base.allocate_vertices = svga_vbuf_render_allocate_vertices;
    svga_render->base.map_vertices = svga_vbuf_render_map_vertices;
    svga_render->base.unmap_vertices = svga_vbuf_render_unmap_vertices;
    svga_render->base.set_primitive = svga_vbuf_render_set_primitive;
    svga_render->base.draw_elements = svga_vbuf_render_draw_elements;
    svga_render->base.draw_arrays = svga_vbuf_render_draw_arrays;
    svga_render->base.release_vertices = svga_vbuf_render_release_vertices;
    svga_render->base.destroy = svga_vbuf_render_destroy;

    return &svga_render->base;
 }
	/**********************************************************
	* Copyright 2008-2009 VMware, Inc. 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 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 THE AUTHORS OR COPYRIGHT HOLDERS
	* 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 "draw/draw_vbuf.h"
	#include "draw/draw_context.h"
	#include "draw/draw_vertex.h"

	#include "util/u_debug.h"
	#include "util/u_inlines.h"
	#include "util/u_math.h"
	#include "util/u_memory.h"

	#include "svga_context.h"
	#include "svga_state.h"
	#include "svga_swtnl.h"

	#include "svga_types.h"
	#include "svga_reg.h"
	#include "svga3d_reg.h"
	#include "svga_draw.h"
	#include "svga_shader.h"
	#include "svga_swtnl_private.h"


	static const struct vertex_info *
	svga_vbuf_render_get_vertex_info(struct vbuf_render *render)
	{
	struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
	struct svga_context *svga = svga_render->svga;

	svga_swtnl_update_vdecl(svga);

	return &svga_render->vertex_info;
	}


	static boolean
	svga_vbuf_render_allocate_vertices(struct vbuf_render *render,
	ushort vertex_size,
	ushort nr_vertices)
	{
	struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
	struct svga_context *svga = svga_render->svga;
	struct pipe_screen *screen = svga->pipe.screen;
	size_t size = (size_t)nr_vertices * (size_t)vertex_size;
	boolean new_vbuf = FALSE;
	boolean new_ibuf = FALSE;

	SVGA_STATS_TIME_PUSH(svga_sws(svga),
	SVGA_STATS_TIME_VBUFRENDERALLOCVERT);

	if (svga_render->vertex_size != vertex_size)
	svga->swtnl.new_vdecl = TRUE;
	svga_render->vertex_size = (size_t)vertex_size;

	if (svga->swtnl.new_vbuf)
	new_ibuf = new_vbuf = TRUE;
	svga->swtnl.new_vbuf = FALSE;

	if (svga_render->vbuf_size
	< svga_render->vbuf_offset + svga_render->vbuf_used + size)
	new_vbuf = TRUE;

	if (new_vbuf)
	pipe_resource_reference(&svga_render->vbuf, NULL);
	if (new_ibuf)
	pipe_resource_reference(&svga_render->ibuf, NULL);

	if (!svga_render->vbuf) {
	svga_render->vbuf_size = MAX2(size, svga_render->vbuf_alloc_size);
	svga_render->vbuf = pipe_buffer_create(screen,
	PIPE_BIND_VERTEX_BUFFER,
	PIPE_USAGE_STREAM,
	svga_render->vbuf_size);
	if (!svga_render->vbuf) {
	svga_context_flush(svga, NULL);
	assert(!svga_render->vbuf);
	svga_render->vbuf = pipe_buffer_create(screen,
	PIPE_BIND_VERTEX_BUFFER,
	PIPE_USAGE_STREAM,
	svga_render->vbuf_size);
	/* The buffer allocation may fail if we run out of memory.
	* The draw module's vbuf code should handle that without crashing.
	*/
	}

	svga->swtnl.new_vdecl = TRUE;
	svga_render->vbuf_offset = 0;
	} else {
	svga_render->vbuf_offset += svga_render->vbuf_used;
	}

	svga_render->vbuf_used = 0;

	if (svga->swtnl.new_vdecl)
	svga_render->vdecl_offset = svga_render->vbuf_offset;

	SVGA_STATS_TIME_POP(svga_sws(svga));

	return TRUE;
	}


	static void *
	svga_vbuf_render_map_vertices(struct vbuf_render *render)
	{
	struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
	struct svga_context *svga = svga_render->svga;
	void * retPtr = NULL;

	SVGA_STATS_TIME_PUSH(svga_sws(svga),
	SVGA_STATS_TIME_VBUFRENDERMAPVERT);

	if (svga_render->vbuf) {
	char ptr = (char)pipe_buffer_map(&svga->pipe,
	svga_render->vbuf,
	PIPE_TRANSFER_WRITE \|
	PIPE_TRANSFER_FLUSH_EXPLICIT \|
	PIPE_TRANSFER_DISCARD_RANGE \|
	PIPE_TRANSFER_UNSYNCHRONIZED,
	&svga_render->vbuf_transfer);
	if (ptr) {
	svga_render->vbuf_ptr = ptr;
	retPtr = ptr + svga_render->vbuf_offset;
	}
	else {
	svga_render->vbuf_ptr = NULL;
	svga_render->vbuf_transfer = NULL;
	retPtr = NULL;
	}
	}
	else {
	/* we probably ran out of memory when allocating the vertex buffer */
	retPtr = NULL;
	}

	SVGA_STATS_TIME_POP(svga_sws(svga));
	return retPtr;
	}


	static void
	svga_vbuf_render_unmap_vertices(struct vbuf_render *render,
	ushort min_index,
	ushort max_index)
	{
	struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
	struct svga_context *svga = svga_render->svga;
	unsigned offset, length;
	size_t used = svga_render->vertex_size * ((size_t)max_index + 1);

	SVGA_STATS_TIME_PUSH(svga_sws(svga),
	SVGA_STATS_TIME_VBUFRENDERUNMAPVERT);

	offset = svga_render->vbuf_offset + svga_render->vertex_size * min_index;
	length = svga_render->vertex_size * (max_index + 1 - min_index);

	if (0) {
	/* dump vertex data */
	const float f = (const float ) ((char *) svga_render->vbuf_ptr +
	svga_render->vbuf_offset);
	unsigned i;
	debug_printf("swtnl vertex data:\n");
	for (i = 0; i < length / 4; i += 4) {
	debug_printf("%u: %f %f %f %f\n", i, f[i], f[i+1], f[i+2], f[i+3]);
	}
	}

	pipe_buffer_flush_mapped_range(&svga->pipe,
	svga_render->vbuf_transfer,
	offset, length);
	pipe_buffer_unmap(&svga->pipe, svga_render->vbuf_transfer);
	svga_render->min_index = min_index;
	svga_render->max_index = max_index;
	svga_render->vbuf_used = MAX2(svga_render->vbuf_used, used);

	SVGA_STATS_TIME_POP(svga_sws(svga));
	}


	static void
	svga_vbuf_render_set_primitive(struct vbuf_render *render,
	enum pipe_prim_type prim)
	{
	struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
	svga_render->prim = prim;
	}


	static void
	svga_vbuf_submit_state(struct svga_vbuf_render *svga_render)
	{
	struct svga_context *svga = svga_render->svga;
	SVGA3dVertexDecl vdecl[PIPE_MAX_ATTRIBS];
	enum pipe_error ret;
	unsigned i;
	static const unsigned zero[PIPE_MAX_ATTRIBS] = {0};

	/* if the vdecl or vbuf hasn't changed do nothing */
	if (!svga->swtnl.new_vdecl)
	return;

	SVGA_STATS_TIME_PUSH(svga_sws(svga),
	SVGA_STATS_TIME_VBUFSUBMITSTATE);

	memcpy(vdecl, svga_render->vdecl, sizeof(vdecl));

	/* flush the hw state */
	ret = svga_hwtnl_flush(svga->hwtnl);
	if (ret != PIPE_OK) {
	svga_context_flush(svga, NULL);
	ret = svga_hwtnl_flush(svga->hwtnl);
	/* if we hit this path we might become synced with hw */
	svga->swtnl.new_vbuf = TRUE;
	assert(ret == PIPE_OK);
	}

	for (i = 0; i < svga_render->vdecl_count; i++) {
	vdecl[i].array.offset += svga_render->vdecl_offset;
	}

	svga_hwtnl_vertex_decls(svga->hwtnl,
	svga_render->vdecl_count,
	vdecl,
	zero,
	svga_render->layout_id);

	/* Specify the vertex buffer (there's only ever one) */
	{
	struct pipe_vertex_buffer vb;
	vb.is_user_buffer = false;
	vb.buffer.resource = svga_render->vbuf;
	vb.buffer_offset = svga_render->vdecl_offset;
	vb.stride = vdecl[0].array.stride;
	svga_hwtnl_vertex_buffers(svga->hwtnl, 1, &vb);
	}

	/* We have already taken care of flatshading, so let the hwtnl
	* module use whatever is most convenient:
	*/
	if (svga->state.sw.need_pipeline) {
	svga_hwtnl_set_flatshade(svga->hwtnl, FALSE, FALSE);
	svga_hwtnl_set_fillmode(svga->hwtnl, PIPE_POLYGON_MODE_FILL);
	}
	else {
	svga_hwtnl_set_flatshade(svga->hwtnl,
	svga->curr.rast->templ.flatshade \|\|
	svga->state.hw_draw.fs->uses_flat_interp,
	svga->curr.rast->templ.flatshade_first);

	svga_hwtnl_set_fillmode(svga->hwtnl, svga->curr.rast->hw_fillmode);
	}

	svga->swtnl.new_vdecl = FALSE;
	SVGA_STATS_TIME_POP(svga_sws(svga));
	}


	static void
	svga_vbuf_render_draw_arrays(struct vbuf_render *render,
	unsigned start, uint nr)
	{
	struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
	struct svga_context *svga = svga_render->svga;
	unsigned bias = (svga_render->vbuf_offset - svga_render->vdecl_offset)
	/ svga_render->vertex_size;
	enum pipe_error ret = PIPE_OK;
	/* instancing will already have been resolved at this point by 'draw' */
	const unsigned start_instance = 0;
	const unsigned instance_count = 1;

	SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_VBUFDRAWARRAYS);

	/* off to hardware */
	svga_vbuf_submit_state(svga_render);

	/* Need to call update_state() again as the draw module may have
	* altered some of our state behind our backs. Testcase:
	* redbook/polys.c
	*/
	svga_update_state_retry(svga, SVGA_STATE_HW_DRAW);

	ret = svga_hwtnl_draw_arrays(svga->hwtnl, svga_render->prim, start + bias,
	nr, start_instance, instance_count);
	if (ret != PIPE_OK) {
	svga_context_flush(svga, NULL);
	ret = svga_hwtnl_draw_arrays(svga->hwtnl, svga_render->prim,
	start + bias, nr,
	start_instance, instance_count);
	svga->swtnl.new_vbuf = TRUE;
	assert(ret == PIPE_OK);
	}
	SVGA_STATS_TIME_POP(svga_sws(svga));
	}


	static void
	svga_vbuf_render_draw_elements(struct vbuf_render *render,
	const ushort *indices,
	uint nr_indices)
	{
	struct svga_vbuf_render *svga_render = svga_vbuf_render(render);
	struct svga_context *svga = svga_render->svga;
	struct pipe_screen *screen = svga->pipe.screen;
	int bias = (svga_render->vbuf_offset - svga_render->vdecl_offset)
	/ svga_render->vertex_size;
	boolean ret;
	size_t size = 2 * nr_indices;
	/* instancing will already have been resolved at this point by 'draw' */
	const unsigned start_instance = 0;
	const unsigned instance_count = 1;

	assert((svga_render->vbuf_offset - svga_render->vdecl_offset)
	% svga_render->vertex_size == 0);

	SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_VBUFDRAWELEMENTS);

	if (svga_render->ibuf_size < svga_render->ibuf_offset + size)
	pipe_resource_reference(&svga_render->ibuf, NULL);

	if (!svga_render->ibuf) {
	svga_render->ibuf_size = MAX2(size, svga_render->ibuf_alloc_size);
	svga_render->ibuf = pipe_buffer_create(screen,
	PIPE_BIND_INDEX_BUFFER,
	PIPE_USAGE_STREAM,
	svga_render->ibuf_size);
	svga_render->ibuf_offset = 0;
	}

	pipe_buffer_write_nooverlap(&svga->pipe, svga_render->ibuf,
	svga_render->ibuf_offset, 2 * nr_indices,
	indices);

	/* off to hardware */
	svga_vbuf_submit_state(svga_render);

	/* Need to call update_state() again as the draw module may have
	* altered some of our state behind our backs. Testcase:
	* redbook/polys.c
	*/
	svga_update_state_retry(svga, SVGA_STATE_HW_DRAW);

	ret = svga_hwtnl_draw_range_elements(svga->hwtnl,
	svga_render->ibuf,
	2,
	bias,
	svga_render->min_index,
	svga_render->max_index,
	svga_render->prim,
	svga_render->ibuf_offset / 2,
	nr_indices,
	start_instance, instance_count);
	if (ret != PIPE_OK) {
	svga_context_flush(svga, NULL);
	ret = svga_hwtnl_draw_range_elements(svga->hwtnl,
	svga_render->ibuf,
	2,
	bias,
	svga_render->min_index,
	svga_render->max_index,
	svga_render->prim,
	svga_render->ibuf_offset / 2,
	nr_indices,
	start_instance, instance_count);
	svga->swtnl.new_vbuf = TRUE;
	assert(ret == PIPE_OK);
	}
	svga_render->ibuf_offset += size;

	SVGA_STATS_TIME_POP(svga_sws(svga));
	}


	static void
	svga_vbuf_render_release_vertices(struct vbuf_render *render)
	{

	}


	static void
	svga_vbuf_render_destroy(struct vbuf_render *render)
	{
	struct svga_vbuf_render *svga_render = svga_vbuf_render(render);

	pipe_resource_reference(&svga_render->vbuf, NULL);
	pipe_resource_reference(&svga_render->ibuf, NULL);
	FREE(svga_render);
	}


	/**
	* Create a new primitive render.
	*/
	struct vbuf_render *
	svga_vbuf_render_create(struct svga_context *svga)
	{
	struct svga_vbuf_render *svga_render = CALLOC_STRUCT(svga_vbuf_render);

	svga_render->svga = svga;
	svga_render->ibuf_size = 0;
	svga_render->vbuf_size = 0;
	svga_render->ibuf_alloc_size = 4*1024;
	svga_render->vbuf_alloc_size = 64*1024;
	svga_render->layout_id = SVGA3D_INVALID_ID;
	svga_render->base.max_vertex_buffer_bytes = 64*1024/10;
	svga_render->base.max_indices = 65536;
	svga_render->base.get_vertex_info = svga_vbuf_render_get_vertex_info;
	svga_render->base.allocate_vertices = svga_vbuf_render_allocate_vertices;
	svga_render->base.map_vertices = svga_vbuf_render_map_vertices;
	svga_render->base.unmap_vertices = svga_vbuf_render_unmap_vertices;
	svga_render->base.set_primitive = svga_vbuf_render_set_primitive;
	svga_render->base.draw_elements = svga_vbuf_render_draw_elements;
	svga_render->base.draw_arrays = svga_vbuf_render_draw_arrays;
	svga_render->base.release_vertices = svga_vbuf_render_release_vertices;
	svga_render->base.destroy = svga_vbuf_render_destroy;

	return &svga_render->base;
	}