src/gallium/drivers/i915simple/i915_prim_vbuf.c

   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  * Build post-transformation, post-clipping vertex buffers and element
  31  * lists by hooking into the end of the primitive pipeline and
  32  * manipulating the vertex_id field in the vertex headers.
  33  *
  34  * XXX: work in progress
  35  *
  36  * \author José Fonseca <jrfonseca@tungstengraphics.com>
  37  * \author Keith Whitwell <keith@tungstengraphics.com>
  38  */
  39
  40
  41 #include "draw/draw_vbuf.h"
  42 #include "pipe/p_debug.h"
  43 #include "pipe/p_util.h"
  44 #include "pipe/p_inlines.h"
  45 #include "pipe/p_winsys.h"
  46
  47 #include "i915_context.h"
  48 #include "i915_reg.h"
  49 #include "i915_winsys.h"
  50 #include "i915_batch.h"
  51 #include "i915_state.h"
  52
  53
  54 /**
  55  * Primitive renderer for i915.
  56  */
  57 struct i915_vbuf_render {
  58    struct vbuf_render base;
  59
  60    struct i915_context *i915;
  61
  62    /** Vertex size in bytes */
  63    unsigned vertex_size;
  64
  65    /** Hardware primitive */
  66    unsigned hwprim;
  67 };
  68
  69
  70 /**
  71  * Basically a cast wrapper.
  72  */
  73 static INLINE struct i915_vbuf_render *
  74 i915_vbuf_render( struct vbuf_render *render )
  75 {
  76    assert(render);
  77    return (struct i915_vbuf_render *)render;
  78 }
  79
  80
  81 static const struct vertex_info *
  82 i915_vbuf_render_get_vertex_info( struct vbuf_render *render )
  83 {
  84    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
  85    struct i915_context *i915 = i915_render->i915;
  86    return &i915->current.vertex_info;
  87 }
  88
  89
  90 static void *
  91 i915_vbuf_render_allocate_vertices( struct vbuf_render *render,
  92                                     ushort vertex_size,
  93                                     ushort nr_vertices )
  94 {
  95    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
  96    struct i915_context *i915 = i915_render->i915;
  97    struct pipe_winsys *winsys = i915->pipe.winsys;
  98    size_t size = (size_t)vertex_size * (size_t)nr_vertices;
  99
 100    /* FIXME: handle failure */
 101    assert(!i915->vbo);
 102    i915->vbo = winsys->buffer_create(winsys, 64, I915_BUFFER_USAGE_LIT_VERTEX,
 103                                      size);
 104
 105    i915->dirty |= I915_NEW_VBO;
 106
 107    return winsys->buffer_map(winsys,
 108                              i915->vbo,
 109                              PIPE_BUFFER_USAGE_CPU_WRITE);
 110 }
 111
 112
 113 static void
 114 i915_vbuf_render_set_primitive( struct vbuf_render *render,
 115                                 unsigned prim )
 116 {
 117    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 118
 119    switch(prim) {
 120    case PIPE_PRIM_POINTS:
 121       i915_render->hwprim = PRIM3D_POINTLIST;
 122       break;
 123    case PIPE_PRIM_LINES:
 124       i915_render->hwprim = PRIM3D_LINELIST;
 125       break;
 126    case PIPE_PRIM_TRIANGLES:
 127       i915_render->hwprim = PRIM3D_TRILIST;
 128       break;
 129    default:
 130       assert(0);
 131    }
 132 }
 133
 134
 135 static void
 136 i915_vbuf_render_draw( struct vbuf_render *render,
 137                        const ushort *indices,
 138                        uint nr_indices)
 139 {
 140    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 141    struct i915_context *i915 = i915_render->i915;
 142    unsigned i;
 143
 144    assert(nr_indices);
 145
 146    assert((i915->dirty & ~I915_NEW_VBO) == 0);
 147
 148    if (i915->dirty)
 149       i915_update_derived( i915 );
 150
 151    if (i915->hardware_dirty)
 152       i915_emit_hardware_state( i915 );
 153
 154    if (!BEGIN_BATCH( 1 + (nr_indices + 1)/2, 1 )) {
 155       FLUSH_BATCH();
 156
 157       /* Make sure state is re-emitted after a flush:
 158        */
 159       i915_update_derived( i915 );
 160       i915_emit_hardware_state( i915 );
 161
 162       if (!BEGIN_BATCH( 1 + (nr_indices + 1)/2, 1 )) {
 163          assert(0);
 164          return;
 165       }
 166    }
 167
 168    OUT_BATCH( _3DPRIMITIVE |
 169               PRIM_INDIRECT |
 170               i915_render->hwprim |
 171               PRIM_INDIRECT_ELTS |
 172               nr_indices );
 173    for (i = 0; i + 1 < nr_indices; i += 2) {
 174       OUT_BATCH( indices[i] |
 175                  (indices[i + 1] << 16) );
 176    }
 177    if (i < nr_indices) {
 178       OUT_BATCH( indices[i] );
 179    }
 180 }
 181
 182
 183 static void
 184 i915_vbuf_render_release_vertices( struct vbuf_render *render,
 185                                    void *vertices,
 186                                    unsigned vertex_size,
 187                                    unsigned vertices_used )
 188 {
 189    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 190    struct i915_context *i915 = i915_render->i915;
 191    struct pipe_winsys *winsys = i915->pipe.winsys;
 192
 193    assert(i915->vbo);
 194    winsys->buffer_unmap(winsys, i915->vbo);
 195    pipe_buffer_reference(winsys, &i915->vbo, NULL);
 196 }
 197
 198
 199 static void
 200 i915_vbuf_render_destroy( struct vbuf_render *render )
 201 {
 202    struct i915_vbuf_render *i915_render = i915_vbuf_render(render);
 203    FREE(i915_render);
 204 }
 205
 206
 207 /**
 208  * Create a new primitive render.
 209  */
 210 static struct vbuf_render *
 211 i915_vbuf_render_create( struct i915_context *i915 )
 212 {
 213    struct i915_vbuf_render *i915_render = CALLOC_STRUCT(i915_vbuf_render);
 214
 215    i915_render->i915 = i915;
 216
 217    i915_render->base.max_vertex_buffer_bytes = 128*1024;
 218
 219    /* NOTE: it must be such that state and vertices indices fit in a single
 220     * batch buffer.
 221     */
 222    i915_render->base.max_indices = 16*1024;
 223
 224    i915_render->base.get_vertex_info = i915_vbuf_render_get_vertex_info;
 225    i915_render->base.allocate_vertices = i915_vbuf_render_allocate_vertices;
 226    i915_render->base.set_primitive = i915_vbuf_render_set_primitive;
 227    i915_render->base.draw = i915_vbuf_render_draw;
 228    i915_render->base.release_vertices = i915_vbuf_render_release_vertices;
 229    i915_render->base.destroy = i915_vbuf_render_destroy;
 230
 231    return &i915_render->base;
 232 }
 233
 234
 235 /**
 236  * Create a new primitive vbuf/render stage.
 237  */
 238 struct draw_stage *i915_draw_vbuf_stage( struct i915_context *i915 )
 239 {
 240    struct vbuf_render *render;
 241    struct draw_stage *stage;
 242
 243    render = i915_vbuf_render_create(i915);
 244    if(!render)
 245       return NULL;
 246
 247    stage = draw_vbuf_stage( i915->draw, render );
 248    if(!stage) {
 249       render->destroy(render);
 250       return NULL;
 251    }
 252
 253    return stage;
 254 }