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          case TGSI_SEMANTIC_FACE:
 114             /* this includes texcoords and varying vars */
 115             src = draw_find_vs_output(softpipe->draw, TGSI_SEMANTIC_GENERIC,
 116                                       spfs->info.input_semantic_index[i]);
 117             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 118             break;
 119
 120          default:
 121             assert(0);
 122          }
 123       }
 124
 125       softpipe->psize_slot = draw_find_vs_output(softpipe->draw,
 126                                                  TGSI_SEMANTIC_PSIZE, 0);
 127       if (softpipe->psize_slot > 0) {
 128          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 129                                softpipe->psize_slot);
 130       }
 131
 132       draw_compute_vertex_size(vinfo);
 133    }
 134
 135    return vinfo;
 136 }
 137
 138
 139 /**
 140  * Called from vbuf module.
 141  *
 142  * Note that there's actually two different vertex layouts in softpipe.
 143  *
 144  * The normal one is computed in softpipe_get_vertex_info() above and is
 145  * used by the point/line/tri "setup" code.
 146  *
 147  * The other one (this one) is only used by the vbuf module (which is
 148  * not normally used by default but used in testing).  For the vbuf module,
 149  * we basically want to pass-through the draw module's vertex layout as-is.
 150  * When the softpipe vbuf code begins drawing, the normal vertex layout
 151  * will come into play again.
 152  */
 153 struct vertex_info *
 154 softpipe_get_vbuf_vertex_info(struct softpipe_context *softpipe)
 155 {
 156    (void) softpipe_get_vertex_info(softpipe);
 157    return &softpipe->vertex_info_vbuf;
 158 }
 159
 160
 161 /**
 162  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 163  */
 164 static void
 165 compute_cliprect(struct softpipe_context *sp)
 166 {
 167    uint surfWidth = sp->framebuffer.width;
 168    uint surfHeight = sp->framebuffer.height;
 169
 170    if (sp->rasterizer->scissor) {
 171       /* clip to scissor rect */
 172       sp->cliprect.minx = MAX2(sp->scissor.minx, 0);
 173       sp->cliprect.miny = MAX2(sp->scissor.miny, 0);
 174       sp->cliprect.maxx = MIN2(sp->scissor.maxx, surfWidth);
 175       sp->cliprect.maxy = MIN2(sp->scissor.maxy, surfHeight);
 176    }
 177    else {
 178       /* clip to surface bounds */
 179       sp->cliprect.minx = 0;
 180       sp->cliprect.miny = 0;
 181       sp->cliprect.maxx = surfWidth;
 182       sp->cliprect.maxy = surfHeight;
 183    }
 184 }
 185
 186
 187 /* Hopefully this will remain quite simple, otherwise need to pull in
 188  * something like the state tracker mechanism.
 189  */
 190 void softpipe_update_derived( struct softpipe_context *softpipe )
 191 {
 192    if (softpipe->dirty & (SP_NEW_RASTERIZER |
 193                           SP_NEW_FS |
 194                           SP_NEW_VS))
 195       invalidate_vertex_layout( softpipe );
 196
 197    if (softpipe->dirty & (SP_NEW_SCISSOR |
 198                           SP_NEW_DEPTH_STENCIL_ALPHA |
 199                           SP_NEW_FRAMEBUFFER))
 200       compute_cliprect(softpipe);
 201
 202    if (softpipe->dirty & (SP_NEW_BLEND |
 203                           SP_NEW_DEPTH_STENCIL_ALPHA |
 204                           SP_NEW_FRAMEBUFFER |
 205                           SP_NEW_RASTERIZER |
 206                           SP_NEW_FS |
 207                           SP_NEW_QUERY))
 208       sp_build_quad_pipeline(softpipe);
 209
 210    softpipe->dirty = 0;
 211 }