src/gallium/drivers/llvmpipe/lp_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 "lp_context.h"
  35 #include "lp_screen.h"
  36 #include "lp_tex_cache.h"
  37 #include "lp_state.h"
  38
  39
  40 /**
  41  * Mark the current vertex layout as "invalid".
  42  * We'll validate the vertex layout later, when we start to actually
  43  * render a point or line or tri.
  44  */
  45 static void
  46 invalidate_vertex_layout(struct llvmpipe_context *llvmpipe)
  47 {
  48    llvmpipe->vertex_info.num_attribs =  0;
  49 }
  50
  51
  52 /**
  53  * The vertex info describes how to convert the post-transformed vertices
  54  * (simple float[][4]) used by the 'draw' module into vertices for
  55  * rasterization.
  56  *
  57  * This function validates the vertex layout and returns a pointer to a
  58  * vertex_info object.
  59  */
  60 struct vertex_info *
  61 llvmpipe_get_vertex_info(struct llvmpipe_context *llvmpipe)
  62 {
  63    struct vertex_info *vinfo = &llvmpipe->vertex_info;
  64
  65    if (vinfo->num_attribs == 0) {
  66       /* compute vertex layout now */
  67       const struct lp_fragment_shader *lpfs = llvmpipe->fs;
  68       struct vertex_info *vinfo_vbuf = &llvmpipe->vertex_info_vbuf;
  69       const uint num = draw_current_shader_outputs(llvmpipe->draw);
  70       uint i;
  71
  72       /* Tell draw_vbuf to simply emit the whole post-xform vertex
  73        * as-is.  No longer any need to try and emit draw vertex_header
  74        * info.
  75        */
  76       vinfo_vbuf->num_attribs = 0;
  77       for (i = 0; i < num; i++) {
  78          draw_emit_vertex_attr(vinfo_vbuf, EMIT_4F, INTERP_PERSPECTIVE, i);
  79       }
  80       draw_compute_vertex_size(vinfo_vbuf);
  81
  82       /*
  83        * Loop over fragment shader inputs, searching for the matching output
  84        * from the vertex shader.
  85        */
  86       vinfo->num_attribs = 0;
  87       for (i = 0; i < lpfs->info.num_inputs; i++) {
  88          int src;
  89          enum interp_mode interp;
  90
  91          switch (lpfs->info.input_interpolate[i]) {
  92          case TGSI_INTERPOLATE_CONSTANT:
  93             interp = INTERP_CONSTANT;
  94             break;
  95          case TGSI_INTERPOLATE_LINEAR:
  96             interp = INTERP_LINEAR;
  97             break;
  98          case TGSI_INTERPOLATE_PERSPECTIVE:
  99             interp = INTERP_PERSPECTIVE;
 100             break;
 101          default:
 102             assert(0);
 103             interp = INTERP_LINEAR;
 104          }
 105
 106          switch (lpfs->info.input_semantic_name[i]) {
 107          case TGSI_SEMANTIC_POSITION:
 108             interp = INTERP_POS;
 109             break;
 110
 111          case TGSI_SEMANTIC_COLOR:
 112             if (llvmpipe->rasterizer->flatshade) {
 113                interp = INTERP_CONSTANT;
 114             }
 115             break;
 116          }
 117
 118          /* this includes texcoords and varying vars */
 119          src = draw_find_shader_output(llvmpipe->draw,
 120                                    lpfs->info.input_semantic_name[i],
 121                                    lpfs->info.input_semantic_index[i]);
 122          draw_emit_vertex_attr(vinfo, EMIT_4F, interp, src);
 123       }
 124
 125       llvmpipe->psize_slot = draw_find_shader_output(llvmpipe->draw,
 126                                                  TGSI_SEMANTIC_PSIZE, 0);
 127       if (llvmpipe->psize_slot > 0) {
 128          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 129                                llvmpipe->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 llvmpipe.
 143  *
 144  * The normal one is computed in llvmpipe_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 llvmpipe vbuf code begins drawing, the normal vertex layout
 151  * will come into play again.
 152  */
 153 struct vertex_info *
 154 llvmpipe_get_vbuf_vertex_info(struct llvmpipe_context *llvmpipe)
 155 {
 156    (void) llvmpipe_get_vertex_info(llvmpipe);
 157    return &llvmpipe->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 llvmpipe_context *lp)
 166 {
 167    /* LP_NEW_FRAMEBUFFER
 168     */
 169    uint surfWidth = lp->framebuffer.width;
 170    uint surfHeight = lp->framebuffer.height;
 171
 172    /* LP_NEW_RASTERIZER
 173     */
 174    if (lp->rasterizer->scissor) {
 175
 176       /* LP_NEW_SCISSOR
 177        *
 178        * clip to scissor rect:
 179        */
 180       lp->cliprect.minx = MAX2(lp->scissor.minx, 0);
 181       lp->cliprect.miny = MAX2(lp->scissor.miny, 0);
 182       lp->cliprect.maxx = MIN2(lp->scissor.maxx, surfWidth);
 183       lp->cliprect.maxy = MIN2(lp->scissor.maxy, surfHeight);
 184    }
 185    else {
 186       /* clip to surface bounds */
 187       lp->cliprect.minx = 0;
 188       lp->cliprect.miny = 0;
 189       lp->cliprect.maxx = surfWidth;
 190       lp->cliprect.maxy = surfHeight;
 191    }
 192 }
 193
 194
 195 /* Hopefully this will remain quite simple, otherwise need to pull in
 196  * something like the state tracker mechanism.
 197  */
 198 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 199 {
 200    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 201
 202    /* Check for updated textures.
 203     */
 204    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 205       llvmpipe->tex_timestamp = lp_screen->timestamp;
 206       llvmpipe->dirty |= LP_NEW_TEXTURE;
 207    }
 208
 209    if (llvmpipe->dirty & (LP_NEW_SAMPLER |
 210                           LP_NEW_TEXTURE)) {
 211       /* TODO */
 212    }
 213
 214    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 215                           LP_NEW_FS |
 216                           LP_NEW_VS))
 217       invalidate_vertex_layout( llvmpipe );
 218
 219    if (llvmpipe->dirty & (LP_NEW_SCISSOR |
 220                           LP_NEW_RASTERIZER |
 221                           LP_NEW_FRAMEBUFFER))
 222       compute_cliprect(llvmpipe);
 223
 224    if (llvmpipe->dirty & (LP_NEW_FS |
 225                           LP_NEW_BLEND |
 226                           LP_NEW_DEPTH_STENCIL_ALPHA |
 227                           LP_NEW_SAMPLER |
 228                           LP_NEW_TEXTURE))
 229       llvmpipe_update_fs( llvmpipe );
 230
 231
 232    llvmpipe->dirty = 0;
 233 }