src/mesa/pipe/draw/draw_context.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   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   */
  32
  33
  34 #ifdef MESA
  35 #include "main/macros.h"
  36 #else
  37 #include "pipe/p_util.h"
  38 #endif
  39 #include "draw_context.h"
  40 #include "draw_private.h"
  41
  42 struct draw_context *draw_create( void )
  43 {
  44    struct draw_context *draw = CALLOC_STRUCT( draw_context );
  45
  46    /* create pipeline stages */
  47    draw->pipeline.unfilled  = draw_unfilled_stage( draw );
  48    draw->pipeline.twoside   = draw_twoside_stage( draw );
  49    draw->pipeline.offset    = draw_offset_stage( draw );
  50    draw->pipeline.clip      = draw_clip_stage( draw );
  51    draw->pipeline.flatshade = draw_flatshade_stage( draw );
  52    draw->pipeline.cull      = draw_cull_stage( draw );
  53
  54    ASSIGN_4V( draw->plane[0], -1,  0,  0, 1 );
  55    ASSIGN_4V( draw->plane[1],  1,  0,  0, 1 );
  56    ASSIGN_4V( draw->plane[2],  0, -1,  0, 1 );
  57    ASSIGN_4V( draw->plane[3],  0,  1,  0, 1 );
  58    ASSIGN_4V( draw->plane[4],  0,  0,  1, 1 ); /* yes these are correct */
  59    ASSIGN_4V( draw->plane[5],  0,  0, -1, 1 ); /* mesa's a bit wonky */
  60    draw->nr_planes = 6;
  61
  62 #ifdef MESA
  63    draw->vf = vf_create( GL_TRUE );
  64 #endif
  65
  66    /* Statically allocate maximum sized vertices for the cache - could be cleverer...
  67     */
  68    {
  69       int i;
  70       char *tmp = malloc(Elements(draw->vcache.vertex) * MAX_VERTEX_SIZE);
  71
  72       for (i = 0; i < Elements(draw->vcache.vertex); i++)
  73          draw->vcache.vertex[i] = (struct vertex_header *)(tmp + i * MAX_VERTEX_SIZE);
  74    }
  75
  76    return draw;
  77 }
  78
  79
  80 void draw_destroy( struct draw_context *draw )
  81 {
  82 #ifdef MESA
  83    if (draw->header.storage) {
  84       ALIGN_FREE( draw->header.storage );
  85    }
  86
  87    vf_destroy( draw->vf );
  88 #endif
  89
  90    free( draw->vcache.vertex[0] ); /* Frees all the vertices. */
  91    free( draw );
  92 }
  93
  94
  95 /**
  96  * Rebuild the rendering pipeline.
  97  */
  98 static void validate_pipeline( struct draw_context *draw )
  99 {
 100    struct draw_stage *next = draw->pipeline.setup;
 101
 102    /*
 103     * NOTE: we build up the pipeline in end-to-start order.
 104     *
 105     * TODO: make the current primitive part of the state and build
 106     * shorter pipelines for lines & points.
 107     */
 108
 109    if (draw->setup.fill_cw != PIPE_POLYGON_MODE_FILL ||
 110        draw->setup.fill_ccw != PIPE_POLYGON_MODE_FILL) {
 111       draw->pipeline.unfilled->next = next;
 112       next = draw->pipeline.unfilled;
 113    }
 114
 115    if (draw->setup.offset_cw ||
 116        draw->setup.offset_ccw) {
 117       draw->pipeline.offset->next = next;
 118       next = draw->pipeline.offset;
 119    }
 120
 121    if (draw->setup.light_twoside) {
 122       draw->pipeline.twoside->next = next;
 123       next = draw->pipeline.twoside;
 124    }
 125
 126    /* Always run the cull stage as we calculate determinant there
 127     * also.  Fix this..
 128     */
 129    {
 130       draw->pipeline.cull->next = next;
 131       next = draw->pipeline.cull;
 132    }
 133
 134    /* Clip stage
 135     */
 136    {
 137       draw->pipeline.clip->next = next;
 138       next = draw->pipeline.clip;
 139    }
 140
 141    /* Do software flatshading prior to clipping.  XXX: should only do
 142     * this for clipped primitives, ie it is a part of the clip
 143     * routine.
 144     */
 145    if (draw->setup.flatshade) {
 146       draw->pipeline.flatshade->next = next;
 147       next = draw->pipeline.flatshade;
 148    }
 149
 150    draw->pipeline.first = next;
 151 }
 152
 153
 154 /**
 155  * Register new primitive setup/rendering state.
 156  * This causes the drawing pipeline to be rebuilt.
 157  */
 158 void draw_set_setup_state( struct draw_context *draw,
 159                            const struct pipe_setup_state *setup )
 160 {
 161    draw->setup = *setup;  /* struct copy */
 162    validate_pipeline( draw );
 163 }
 164
 165
 166 /**
 167  * Plug in the primitive rendering/rasterization stage.
 168  * This is provided by the device driver.
 169  */
 170 void draw_set_setup_stage( struct draw_context *draw,
 171                            struct draw_stage *stage )
 172 {
 173    draw->pipeline.setup = stage;
 174 }
 175
 176
 177 /**
 178  * Set the draw module's clipping state.
 179  */
 180 void draw_set_clip_state( struct draw_context *draw,
 181                           const struct pipe_clip_state *clip )
 182 {
 183    memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
 184    draw->nr_planes = 6 + clip->nr;
 185 }
 186
 187
 188 /**
 189  * Set the draw module's viewport state.
 190  */
 191 void draw_set_viewport_state( struct draw_context *draw,
 192                               const struct pipe_viewport_state *viewport )
 193 {
 194    draw->viewport = *viewport; /* struct copy */
 195
 196 #ifdef MESA
 197    vf_set_vp_scale_translate( draw->vf, viewport->scale, viewport->translate );
 198 #endif
 199
 200    /* Using tnl/ and vf/ modules is temporary while getting started.
 201     * Full pipe will have vertex shader, vertex fetch of its own.
 202     */
 203 }
 204
 205
 206 void draw_set_vertex_array_info(struct draw_context *draw,
 207                                 const struct pipe_vertex_buffer *buffers,
 208                                 const struct pipe_vertex_element *elements)
 209 {
 210    draw->vertex_buffer = buffers;
 211    draw->vertex_element = elements;
 212 }
 213