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 #if 0
  75          vinfo_vbuf->num_attribs = 0;
  76          /* special-case to allow memcpy of whole vertex */
  77          draw_emit_vertex_attr(vinfo_vbuf, EMIT_ALL, INTERP_NONE, 0);
  78          /* size in dwords or floats */
  79          vinfo_vbuf->size = 4 * draw_num_vs_outputs(softpipe->draw)
  80                           + sizeof(struct vertex_header) / 4;
  81 #else
  82          /* for pass-through mode, we need a more explicit list of attribs */
  83          const uint num = draw_num_vs_outputs(softpipe->draw);
  84          uint i;
  85
  86          vinfo_vbuf->num_attribs = 0;
  87          draw_emit_vertex_attr(vinfo_vbuf, EMIT_HEADER, INTERP_NONE, 0);
  88          for (i = 0; i < num; i++) {
  89             draw_emit_vertex_attr(vinfo_vbuf, EMIT_4F, INTERP_PERSPECTIVE, i);
  90          }
  91          draw_compute_vertex_size(vinfo_vbuf);
  92 #endif
  93       }
  94
  95       /*
  96        * Loop over fragment shader inputs, searching for the matching output
  97        * from the vertex shader.
  98        */
  99       vinfo->num_attribs = 0;
 100       for (i = 0; i < spfs->info.num_inputs; i++) {
 101          int src;
 102          switch (spfs->info.input_semantic_name[i]) {
 103          case TGSI_SEMANTIC_POSITION:
 104             src = draw_find_vs_output(softpipe->draw,
 105                                       TGSI_SEMANTIC_POSITION, 0);
 106             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
 107             break;
 108
 109          case TGSI_SEMANTIC_COLOR:
 110             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_COLOR,
 111                                  spfs->info.input_semantic_index[i]);
 112             draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
 113             break;
 114
 115          case TGSI_SEMANTIC_FOG:
 116             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_FOG, 0);
 117             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 118             break;
 119
 120          case TGSI_SEMANTIC_GENERIC:
 121             /* this includes texcoords and varying vars */
 122             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_GENERIC,
 123                                       spfs->info.input_semantic_index[i]);
 124             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 125             break;
 126
 127          default:
 128             assert(0);
 129          }
 130       }
 131
 132       softpipe->psize_slot = draw_find_vs_output(softpipe->draw,
 133                                                  TGSI_SEMANTIC_PSIZE, 0);
 134       if (softpipe->psize_slot > 0) {
 135          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 136                                softpipe->psize_slot);
 137       }
 138
 139       draw_compute_vertex_size(vinfo);
 140    }
 141
 142    return vinfo;
 143 }
 144
 145
 146 /**
 147  * Called from vbuf module.
 148  *
 149  * Note that there's actually two different vertex layouts in softpipe.
 150  *
 151  * The normal one is computed in softpipe_get_vertex_info() above and is
 152  * used by the point/line/tri "setup" code.
 153  *
 154  * The other one (this one) is only used by the vbuf module (which is
 155  * not normally used by default but used in testing).  For the vbuf module,
 156  * we basically want to pass-through the draw module's vertex layout as-is.
 157  * When the softpipe vbuf code begins drawing, the normal vertex layout
 158  * will come into play again.
 159  */
 160 struct vertex_info *
 161 softpipe_get_vbuf_vertex_info(struct softpipe_context *softpipe)
 162 {
 163    (void) softpipe_get_vertex_info(softpipe);
 164    return &softpipe->vertex_info_vbuf;
 165 }
 166
 167
 168 /**
 169  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 170  */
 171 static void
 172 compute_cliprect(struct softpipe_context *sp)
 173 {
 174    unsigned surfWidth, surfHeight;
 175
 176    if (sp->framebuffer.num_cbufs > 0) {
 177       surfWidth = sp->framebuffer.cbufs[0]->width;
 178       surfHeight = sp->framebuffer.cbufs[0]->height;
 179    }
 180    else {
 181       /* no surface? */
 182       surfWidth = sp->scissor.maxx;
 183       surfHeight = sp->scissor.maxy;
 184    }
 185
 186    if (sp->rasterizer->scissor) {
 187       /* clip to scissor rect */
 188       sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
 189       sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
 190       sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
 191       sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
 192    }
 193    else {
 194       /* clip to surface bounds */
 195       sp->cliprect.minx = 0;
 196       sp->cliprect.miny = 0;
 197       sp->cliprect.maxx = surfWidth;
 198       sp->cliprect.maxy = surfHeight;
 199    }
 200 }
 201
 202
 203 /* Hopefully this will remain quite simple, otherwise need to pull in
 204  * something like the state tracker mechanism.
 205  */
 206 void softpipe_update_derived( struct softpipe_context *softpipe )
 207 {
 208    if (softpipe->dirty & (SP_NEW_RASTERIZER |
 209                           SP_NEW_FS |
 210                           SP_NEW_VS))
 211       invalidate_vertex_layout( softpipe );
 212
 213    if (softpipe->dirty & (SP_NEW_SCISSOR |
 214                           SP_NEW_DEPTH_STENCIL_ALPHA |
 215                           SP_NEW_FRAMEBUFFER))
 216       compute_cliprect(softpipe);
 217
 218    if (softpipe->dirty & (SP_NEW_BLEND |
 219                           SP_NEW_DEPTH_STENCIL_ALPHA |
 220                           SP_NEW_FRAMEBUFFER |
 221                           SP_NEW_RASTERIZER |
 222                           SP_NEW_FS |
 223                           SP_NEW_QUERY))
 224       sp_build_quad_pipeline(softpipe);
 225
 226    softpipe->dirty = 0;
 227 }