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 "util/u_math.h"
  29 #include "util/u_memory.h"
  30 #include "pipe/p_shader_tokens.h"
  31 #include "draw/draw_context.h"
  32 #include "draw/draw_vertex.h"
  33 #include "draw/draw_private.h"
  34 #include "sp_context.h"
  35 #include "sp_state.h"
  36
  37
  38 /**
  39  * Mark the current vertex layout as "invalid".
  40  * We'll validate the vertex layout later, when we start to actually
  41  * render a point or line or tri.
  42  */
  43 static void
  44 invalidate_vertex_layout(struct softpipe_context *softpipe)
  45 {
  46    softpipe->vertex_info.num_attribs =  0;
  47 }
  48
  49
  50 /**
  51  * The vertex info describes how to convert the post-transformed vertices
  52  * (simple float[][4]) used by the 'draw' module into vertices for
  53  * rasterization.
  54  *
  55  * This function validates the vertex layout and returns a pointer to a
  56  * vertex_info object.
  57  */
  58 struct vertex_info *
  59 softpipe_get_vertex_info(struct softpipe_context *softpipe)
  60 {
  61    struct vertex_info *vinfo = &softpipe->vertex_info;
  62
  63    if (vinfo->num_attribs == 0) {
  64       /* compute vertex layout now */
  65       const struct sp_fragment_shader *spfs = softpipe->fs;
  66       const enum interp_mode colorInterp
  67          = softpipe->rasterizer->flatshade ? INTERP_CONSTANT : INTERP_LINEAR;
  68       uint i;
  69
  70       if (softpipe->vbuf) {
  71          /* if using the post-transform vertex buffer, tell draw_vbuf to
  72           * simply emit the whole post-xform vertex as-is:
  73           */
  74          struct vertex_info *vinfo_vbuf = &softpipe->vertex_info_vbuf;
  75          const uint num = draw_num_vs_outputs(softpipe->draw);
  76          uint i;
  77
  78          /* No longer any need to try and emit draw vertex_header info.
  79           */
  80          vinfo_vbuf->num_attribs = 0;
  81          for (i = 0; i < num; i++) {
  82             draw_emit_vertex_attr(vinfo_vbuf, EMIT_4F, INTERP_PERSPECTIVE, i);
  83          }
  84          draw_compute_vertex_size(vinfo_vbuf);
  85       }
  86
  87       /*
  88        * Loop over fragment shader inputs, searching for the matching output
  89        * from the vertex shader.
  90        */
  91       vinfo->num_attribs = 0;
  92       for (i = 0; i < spfs->info.num_inputs; i++) {
  93          int src;
  94          switch (spfs->info.input_semantic_name[i]) {
  95          case TGSI_SEMANTIC_POSITION:
  96             src = draw_find_vs_output(softpipe->draw,
  97                                       TGSI_SEMANTIC_POSITION, 0);
  98             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
  99             break;
 100
 101          case TGSI_SEMANTIC_COLOR:
 102             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_COLOR,
 103                                  spfs->info.input_semantic_index[i]);
 104             draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
 105             break;
 106
 107          case TGSI_SEMANTIC_FOG:
 108             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_FOG, 0);
 109             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 110             break;
 111
 112          case TGSI_SEMANTIC_GENERIC:
 113             /* this includes texcoords and varying vars */
 114             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_GENERIC,
 115                                       spfs->info.input_semantic_index[i]);
 116             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 117             break;
 118
 119          default:
 120             assert(0);
 121          }
 122       }
 123
 124       softpipe->psize_slot = draw_find_vs_output(softpipe->draw,
 125                                                  TGSI_SEMANTIC_PSIZE, 0);
 126       if (softpipe->psize_slot > 0) {
 127          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 128                                softpipe->psize_slot);
 129       }
 130
 131       draw_compute_vertex_size(vinfo);
 132    }
 133
 134    return vinfo;
 135 }
 136
 137
 138 /**
 139  * Called from vbuf module.
 140  *
 141  * Note that there's actually two different vertex layouts in softpipe.
 142  *
 143  * The normal one is computed in softpipe_get_vertex_info() above and is
 144  * used by the point/line/tri "setup" code.
 145  *
 146  * The other one (this one) is only used by the vbuf module (which is
 147  * not normally used by default but used in testing).  For the vbuf module,
 148  * we basically want to pass-through the draw module's vertex layout as-is.
 149  * When the softpipe vbuf code begins drawing, the normal vertex layout
 150  * will come into play again.
 151  */
 152 struct vertex_info *
 153 softpipe_get_vbuf_vertex_info(struct softpipe_context *softpipe)
 154 {
 155    (void) softpipe_get_vertex_info(softpipe);
 156    return &softpipe->vertex_info_vbuf;
 157 }
 158
 159
 160 /**
 161  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 162  */
 163 static void
 164 compute_cliprect(struct softpipe_context *sp)
 165 {
 166    uint surfWidth = sp->framebuffer.width;
 167    uint surfHeight = sp->framebuffer.height;
 168
 169    if (sp->rasterizer->scissor) {
 170       /* clip to scissor rect */
 171       sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
 172       sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
 173       sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
 174       sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
 175    }
 176    else {
 177       /* clip to surface bounds */
 178       sp->cliprect.minx = 0;
 179       sp->cliprect.miny = 0;
 180       sp->cliprect.maxx = surfWidth;
 181       sp->cliprect.maxy = surfHeight;
 182    }
 183 }
 184
 185
 186 /* Hopefully this will remain quite simple, otherwise need to pull in
 187  * something like the state tracker mechanism.
 188  */
 189 void softpipe_update_derived( struct softpipe_context *softpipe )
 190 {
 191    if (softpipe->dirty & (SP_NEW_RASTERIZER |
 192                           SP_NEW_FS |
 193                           SP_NEW_VS))
 194       invalidate_vertex_layout( softpipe );
 195
 196    if (softpipe->dirty & (SP_NEW_SCISSOR |
 197                           SP_NEW_DEPTH_STENCIL_ALPHA |
 198                           SP_NEW_FRAMEBUFFER))
 199       compute_cliprect(softpipe);
 200
 201    if (softpipe->dirty & (SP_NEW_BLEND |
 202                           SP_NEW_DEPTH_STENCIL_ALPHA |
 203                           SP_NEW_FRAMEBUFFER |
 204                           SP_NEW_RASTERIZER |
 205                           SP_NEW_FS |
 206                           SP_NEW_QUERY))
 207       sp_build_quad_pipeline(softpipe);
 208
 209    softpipe->dirty = 0;
 210 }