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      1 /**************************************************************************
      2  *
      3  * Copyright 2007 VMware, Inc.
      4  * All Rights Reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the
      8  * "Software"), to deal in the Software without restriction, including
      9  * without limitation the rights to use, copy, modify, merge, publish,
     10  * distribute, sub license, and/or sell copies of the Software, and to
     11  * permit persons to whom the Software is furnished to do so, subject to
     12  * the following conditions:
     13  *
     14  * The above copyright notice and this permission notice (including the
     15  * next paragraph) shall be included in all copies or substantial portions
     16  * of the Software.
     17  *
     18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
     22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     25  *
     26  **************************************************************************/
     27 
     28 /**
     29  * \file
     30  * Vertex buffer drawing stage.
     31  *
     32  * \author Keith Whitwell <keithw (at) vmware.com>
     33  * \author Jose Fonseca <jfonseca (at) vmware.com>
     34  */
     35 
     36 #ifndef DRAW_VBUF_H_
     37 #define DRAW_VBUF_H_
     38 
     39 
     40 #include "pipe/p_compiler.h"
     41 #include "pipe/p_defines.h"
     42 
     43 
     44 struct pipe_rasterizer_state;
     45 struct draw_context;
     46 struct vertex_info;
     47 struct pipe_query_data_pipeline_statistics;
     48 
     49 
     50 /**
     51  * Interface for hardware vertex buffer rendering.
     52  */
     53 struct vbuf_render {
     54 
     55    /**
     56     * Driver limits.  May be tuned lower to improve cache hits on
     57     * index list.
     58     */
     59    unsigned max_indices;
     60    unsigned max_vertex_buffer_bytes;
     61 
     62    /**
     63     * Query if the hardware driver needs assistance for a particular
     64     * combination of rasterizer state and primitive.
     65     *
     66     * Currently optional.
     67     */
     68    boolean (*need_pipeline)(const struct vbuf_render *render,
     69                             const struct pipe_rasterizer_state *rasterizer,
     70                             unsigned int prim );
     71 
     72 
     73    /**
     74     * Get the hardware vertex format.
     75     *
     76     * XXX: have this in draw_context instead?
     77     */
     78    const struct vertex_info *(*get_vertex_info)( struct vbuf_render * );
     79 
     80    /**
     81     * Request a destination for vertices.
     82     * Hardware renderers will use ttm memory, others will just malloc
     83     * something.
     84     */
     85    boolean (*allocate_vertices)( struct vbuf_render *,
     86                                  ushort vertex_size,
     87                                  ushort nr_vertices );
     88 
     89    void *(*map_vertices)( struct vbuf_render * );
     90    void (*unmap_vertices)( struct vbuf_render *,
     91                            ushort min_index,
     92                            ushort max_index );
     93 
     94    /**
     95     * Notify the renderer of the current primitive when it changes.
     96     * Must succeed for TRIANGLES, LINES and POINTS.  Other prims at
     97     * the discretion of the driver, for the benefit of the passthrough
     98     * path.
     99     */
    100    void (*set_primitive)( struct vbuf_render *, enum pipe_prim_type prim );
    101 
    102    /**
    103     * Draw indexed primitives.  Note that indices are ushort.  The driver
    104     * must complete this call, if necessary splitting the index list itself.
    105     */
    106    void (*draw_elements)( struct vbuf_render *,
    107                           const ushort *indices,
    108                           uint nr_indices );
    109 
    110    /* Draw non-indexed primitives.
    111     */
    112    void (*draw_arrays)( struct vbuf_render *,
    113 			unsigned start,
    114 			uint nr );
    115 
    116    /**
    117     * Called when vbuf is done with this set of vertices:
    118     */
    119    void (*release_vertices)( struct vbuf_render * );
    120 
    121    void (*destroy)( struct vbuf_render * );
    122 
    123 
    124    /**
    125     * Called after writing data to the stream out buffers
    126     */
    127    void (*set_stream_output_info)( struct vbuf_render *vbufr,
    128                                    unsigned primitive_count,
    129                                    unsigned primitive_generated );
    130 
    131    /**
    132     * Called after all relevant statistics have been accumulated.
    133     */
    134    void (*pipeline_statistics)(
    135       struct vbuf_render *vbufr,
    136       const struct pipe_query_data_pipeline_statistics *stats );
    137 };
    138 
    139 
    140 
    141 struct draw_stage *
    142 draw_vbuf_stage( struct draw_context *draw,
    143                  struct vbuf_render *render );
    144 
    145 
    146 #endif /*DRAW_VBUF_H_*/
    147