src/gallium/auxiliary/draw/draw_vbuf.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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 <keith@tungstengraphics.com>
  33  * \author Jose Fonseca <jrfonsec@tungstengraphics.com>
  34  */
  35
  36 #ifndef DRAW_VBUF_H_
  37 #define DRAW_VBUF_H_
  38
  39
  40 #include "pipe/p_compiler.h"
  41
  42
  43 struct pipe_rasterizer_state;
  44 struct draw_context;
  45 struct vertex_info;
  46
  47
  48 /**
  49  * Interface for hardware vertex buffer rendering.
  50  */
  51 struct vbuf_render {
  52
  53    /**
  54     * Driver limits.  May be tuned lower to improve cache hits on
  55     * index list.
  56     */
  57    unsigned max_indices;
  58    unsigned max_vertex_buffer_bytes;
  59
  60    /**
  61     * Query if the hardware driver needs assistance for a particular
  62     * combination of rasterizer state and primitive.
  63     *
  64     * Currently optional.
  65     */
  66    boolean (*need_pipeline)(const struct vbuf_render *render,
  67                             const struct pipe_rasterizer_state *rasterizer,
  68                             unsigned int prim );
  69
  70
  71    /**
  72     * Get the hardware vertex format.
  73     *
  74     * XXX: have this in draw_context instead?
  75     */
  76    const struct vertex_info *(*get_vertex_info)( struct vbuf_render * );
  77
  78    /**
  79     * Request a destination for vertices.
  80     * Hardware renderers will use ttm memory, others will just malloc
  81     * something.
  82     */
  83    boolean (*allocate_vertices)( struct vbuf_render *,
  84                                  ushort vertex_size,
  85                                  ushort nr_vertices );
  86
  87    void *(*map_vertices)( struct vbuf_render * );
  88    void (*unmap_vertices)( struct vbuf_render *,
  89                            ushort min_index,
  90                            ushort max_index );
  91
  92    /**
  93     * Notify the renderer of the current primitive when it changes.
  94     * Must succeed for TRIANGLES, LINES and POINTS.  Other prims at
  95     * the discretion of the driver, for the benefit of the passthrough
  96     * path.
  97     */
  98    void (*set_primitive)( struct vbuf_render *, unsigned prim );
  99
 100    /**
 101     * Draw indexed primitives.  Note that indices are ushort.  The driver
 102     * must complete this call, if necessary splitting the index list itself.
 103     */
 104    void (*draw_elements)( struct vbuf_render *,
 105                           const ushort *indices,
 106                           uint nr_indices );
 107
 108    /* Draw non-indexed primitives.
 109     */
 110    void (*draw_arrays)( struct vbuf_render *,
 111                         unsigned start,
 112                         uint nr );
 113
 114    /**
 115     * Called when vbuf is done with this set of vertices:
 116     */
 117    void (*release_vertices)( struct vbuf_render * );
 118
 119    void (*destroy)( struct vbuf_render * );
 120
 121
 122    /**
 123     * Called after writing data to the stream out buffers
 124     */
 125    void (*set_stream_output_info)( struct vbuf_render *vbufr,
 126                                    unsigned primitive_count,
 127                                    unsigned vertices_count,
 128                                    unsigned primitive_generated );
 129 };
 130
 131
 132
 133 struct draw_stage *
 134 draw_vbuf_stage( struct draw_context *draw,
 135                  struct vbuf_render *render );
 136
 137
 138 #endif /*DRAW_VBUF_H_*/