src/gallium/drivers/softpipe/sp_state_derived.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 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 #include "pipe/p_util.h"
  29 #include "pipe/p_shader_tokens.h"
  30 #include "draw/draw_context.h"
  31 #include "draw/draw_vertex.h"
  32 #include "draw/draw_private.h"
  33 #include "sp_context.h"
  34 #include "sp_state.h"
  35
  36
  37 /**
  38  * Mark the current vertex layout as "invalid".
  39  * We'll validate the vertex layout later, when we start to actually
  40  * render a point or line or tri.
  41  */
  42 static void
  43 invalidate_vertex_layout(struct softpipe_context *softpipe)
  44 {
  45    softpipe->vertex_info.num_attribs =  0;
  46 }
  47
  48
  49 /**
  50  * The vertex info describes how to convert the post-transformed vertices
  51  * (simple float[][4]) used by the 'draw' module into vertices for
  52  * rasterization.
  53  *
  54  * This function validates the vertex layout and returns a pointer to a
  55  * vertex_info object.
  56  */
  57 struct vertex_info *
  58 softpipe_get_vertex_info(struct softpipe_context *softpipe)
  59 {
  60    struct vertex_info *vinfo = &softpipe->vertex_info;
  61
  62    if (vinfo->num_attribs == 0) {
  63       /* compute vertex layout now */
  64       const struct sp_fragment_shader *spfs = softpipe->fs;
  65       const enum interp_mode colorInterp
  66          = softpipe->rasterizer->flatshade ? INTERP_CONSTANT : INTERP_LINEAR;
  67       uint i;
  68
  69       if (softpipe->vbuf) {
  70          /* if using the post-transform vertex buffer, tell draw_vbuf to
  71           * simply emit the whole post-xform vertex as-is:
  72           */
  73          struct vertex_info *vinfo_vbuf = &softpipe->vertex_info_vbuf;
  74          const uint num = draw_num_vs_outputs(softpipe->draw);
  75          uint i;
  76
  77          /* No longer any need to try and emit draw vertex_header info.
  78           */
  79          vinfo_vbuf->num_attribs = 0;
  80          for (i = 0; i < num; i++) {
  81             draw_emit_vertex_attr(vinfo_vbuf, EMIT_4F, INTERP_PERSPECTIVE, i);
  82          }
  83          draw_compute_vertex_size(vinfo_vbuf);
  84       }
  85
  86       /*
  87        * Loop over fragment shader inputs, searching for the matching output
  88        * from the vertex shader.
  89        */
  90       vinfo->num_attribs = 0;
  91       for (i = 0; i < spfs->info.num_inputs; i++) {
  92          int src;
  93          switch (spfs->info.input_semantic_name[i]) {
  94          case TGSI_SEMANTIC_POSITION:
  95             src = draw_find_vs_output(softpipe->draw,
  96                                       TGSI_SEMANTIC_POSITION, 0);
  97             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
  98             break;
  99
 100          case TGSI_SEMANTIC_COLOR:
 101             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_COLOR,
 102                                  spfs->info.input_semantic_index[i]);
 103             draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
 104             break;
 105
 106          case TGSI_SEMANTIC_FOG:
 107             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_FOG, 0);
 108             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 109             break;
 110
 111          case TGSI_SEMANTIC_GENERIC:
 112             /* this includes texcoords and varying vars */
 113             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_GENERIC,
 114                                       spfs->info.input_semantic_index[i]);
 115             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 116             break;
 117
 118          default:
 119             assert(0);
 120          }
 121       }
 122
 123       softpipe->psize_slot = draw_find_vs_output(softpipe->draw,
 124                                                  TGSI_SEMANTIC_PSIZE, 0);
 125       if (softpipe->psize_slot > 0) {
 126          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 127                                softpipe->psize_slot);
 128       }
 129
 130       draw_compute_vertex_size(vinfo);
 131    }
 132
 133    return vinfo;
 134 }
 135
 136
 137 /**
 138  * Called from vbuf module.
 139  *
 140  * Note that there's actually two different vertex layouts in softpipe.
 141  *
 142  * The normal one is computed in softpipe_get_vertex_info() above and is
 143  * used by the point/line/tri "setup" code.
 144  *
 145  * The other one (this one) is only used by the vbuf module (which is
 146  * not normally used by default but used in testing).  For the vbuf module,
 147  * we basically want to pass-through the draw module's vertex layout as-is.
 148  * When the softpipe vbuf code begins drawing, the normal vertex layout
 149  * will come into play again.
 150  */
 151 struct vertex_info *
 152 softpipe_get_vbuf_vertex_info(struct softpipe_context *softpipe)
 153 {
 154    (void) softpipe_get_vertex_info(softpipe);
 155    return &softpipe->vertex_info_vbuf;
 156 }
 157
 158
 159 /**
 160  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 161  */
 162 static void
 163 compute_cliprect(struct softpipe_context *sp)
 164 {
 165    uint surfWidth = sp->framebuffer.width;
 166    uint surfHeight = sp->framebuffer.height;
 167
 168    if (sp->rasterizer->scissor) {
 169       /* clip to scissor rect */
 170       sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
 171       sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
 172       sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
 173       sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
 174    }
 175    else {
 176       /* clip to surface bounds */
 177       sp->cliprect.minx = 0;
 178       sp->cliprect.miny = 0;
 179       sp->cliprect.maxx = surfWidth;
 180       sp->cliprect.maxy = surfHeight;
 181    }
 182 }
 183
 184
 185 /* Hopefully this will remain quite simple, otherwise need to pull in
 186  * something like the state tracker mechanism.
 187  */
 188 void softpipe_update_derived( struct softpipe_context *softpipe )
 189 {
 190    if (softpipe->dirty & (SP_NEW_RASTERIZER |
 191                           SP_NEW_FS |
 192                           SP_NEW_VS))
 193       invalidate_vertex_layout( softpipe );
 194
 195    if (softpipe->dirty & (SP_NEW_SCISSOR |
 196                           SP_NEW_DEPTH_STENCIL_ALPHA |
 197                           SP_NEW_FRAMEBUFFER))
 198       compute_cliprect(softpipe);
 199
 200    if (softpipe->dirty & (SP_NEW_BLEND |
 201                           SP_NEW_DEPTH_STENCIL_ALPHA |
 202                           SP_NEW_FRAMEBUFFER |
 203                           SP_NEW_RASTERIZER |
 204                           SP_NEW_FS |
 205                           SP_NEW_QUERY))
 206       sp_build_quad_pipeline(softpipe);
 207
 208    softpipe->dirty = 0;
 209 }