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_state.h"
  37
  38
  39 /**
  40  * Mark the current vertex layout as "invalid".
  41  * We'll validate the vertex layout later, when we start to actually
  42  * render a point or line or tri.
  43  */
  44 static void
  45 invalidate_vertex_layout(struct llvmpipe_context *llvmpipe)
  46 {
  47    llvmpipe->vertex_info.num_attribs =  0;
  48 }
  49
  50
  51 /**
  52  * The vertex info describes how to convert the post-transformed vertices
  53  * (simple float[][4]) used by the 'draw' module into vertices for
  54  * rasterization.
  55  *
  56  * This function validates the vertex layout and returns a pointer to a
  57  * vertex_info object.
  58  */
  59 struct vertex_info *
  60 llvmpipe_get_vertex_info(struct llvmpipe_context *llvmpipe)
  61 {
  62    struct vertex_info *vinfo = &llvmpipe->vertex_info;
  63
  64    if (vinfo->num_attribs == 0) {
  65       /* compute vertex layout now */
  66       const struct lp_fragment_shader *lpfs = llvmpipe->fs;
  67       const enum interp_mode colorInterp
  68          = llvmpipe->rasterizer->flatshade ? INTERP_CONSTANT : INTERP_LINEAR;
  69       struct vertex_info *vinfo_vbuf = &llvmpipe->vertex_info_vbuf;
  70       const uint num = draw_num_vs_outputs(llvmpipe->draw);
  71       uint i;
  72
  73       /* Tell draw_vbuf to simply emit the whole post-xform vertex
  74        * as-is.  No longer any need to try and emit draw vertex_header
  75        * info.
  76        */
  77       vinfo_vbuf->num_attribs = 0;
  78       for (i = 0; i < num; i++) {
  79          draw_emit_vertex_attr(vinfo_vbuf, EMIT_4F, INTERP_PERSPECTIVE, i);
  80       }
  81       draw_compute_vertex_size(vinfo_vbuf);
  82
  83       /*
  84        * Loop over fragment shader inputs, searching for the matching output
  85        * from the vertex shader.
  86        */
  87       vinfo->num_attribs = 0;
  88       for (i = 0; i < lpfs->info.num_inputs; i++) {
  89          int src;
  90          enum interp_mode interp;
  91
  92          switch (lpfs->info.input_interpolate[i]) {
  93          case TGSI_INTERPOLATE_CONSTANT:
  94             interp = INTERP_CONSTANT;
  95             break;
  96          case TGSI_INTERPOLATE_LINEAR:
  97             interp = INTERP_LINEAR;
  98             break;
  99          case TGSI_INTERPOLATE_PERSPECTIVE:
 100             interp = INTERP_PERSPECTIVE;
 101             break;
 102          default:
 103             assert(0);
 104             interp = INTERP_LINEAR;
 105          }
 106
 107          switch (lpfs->info.input_semantic_name[i]) {
 108          case TGSI_SEMANTIC_POSITION:
 109             src = draw_find_vs_output(llvmpipe->draw,
 110                                       TGSI_SEMANTIC_POSITION, 0);
 111             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
 112             break;
 113
 114          case TGSI_SEMANTIC_COLOR:
 115             src = draw_find_vs_output(llvmpipe->draw, TGSI_SEMANTIC_COLOR,
 116                                  lpfs->info.input_semantic_index[i]);
 117             draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
 118             break;
 119
 120          case TGSI_SEMANTIC_FOG:
 121             src = draw_find_vs_output(llvmpipe->draw, TGSI_SEMANTIC_FOG, 0);
 122             draw_emit_vertex_attr(vinfo, EMIT_4F, interp, src);
 123             break;
 124
 125          case TGSI_SEMANTIC_GENERIC:
 126          case TGSI_SEMANTIC_FACE:
 127             /* this includes texcoords and varying vars */
 128             src = draw_find_vs_output(llvmpipe->draw, TGSI_SEMANTIC_GENERIC,
 129                                       lpfs->info.input_semantic_index[i]);
 130             draw_emit_vertex_attr(vinfo, EMIT_4F, interp, src);
 131             break;
 132
 133          default:
 134             assert(0);
 135          }
 136       }
 137
 138       llvmpipe->psize_slot = draw_find_vs_output(llvmpipe->draw,
 139                                                  TGSI_SEMANTIC_PSIZE, 0);
 140       if (llvmpipe->psize_slot > 0) {
 141          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 142                                llvmpipe->psize_slot);
 143       }
 144
 145       draw_compute_vertex_size(vinfo);
 146    }
 147
 148    return vinfo;
 149 }
 150
 151
 152 /**
 153  * Called from vbuf module.
 154  *
 155  * Note that there's actually two different vertex layouts in llvmpipe.
 156  *
 157  * The normal one is computed in llvmpipe_get_vertex_info() above and is
 158  * used by the point/line/tri "setup" code.
 159  *
 160  * The other one (this one) is only used by the vbuf module (which is
 161  * not normally used by default but used in testing).  For the vbuf module,
 162  * we basically want to pass-through the draw module's vertex layout as-is.
 163  * When the llvmpipe vbuf code begins drawing, the normal vertex layout
 164  * will come into play again.
 165  */
 166 struct vertex_info *
 167 llvmpipe_get_vbuf_vertex_info(struct llvmpipe_context *llvmpipe)
 168 {
 169    (void) llvmpipe_get_vertex_info(llvmpipe);
 170    return &llvmpipe->vertex_info_vbuf;
 171 }
 172
 173
 174 /**
 175  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 176  */
 177 static void
 178 compute_cliprect(struct llvmpipe_context *lp)
 179 {
 180    /* LP_NEW_FRAMEBUFFER
 181     */
 182    uint surfWidth = lp->framebuffer.width;
 183    uint surfHeight = lp->framebuffer.height;
 184
 185    /* LP_NEW_RASTERIZER
 186     */
 187    if (lp->rasterizer->scissor) {
 188
 189       /* LP_NEW_SCISSOR
 190        *
 191        * clip to scissor rect:
 192        */
 193       lp->cliprect.minx = MAX2(lp->scissor.minx, 0);
 194       lp->cliprect.miny = MAX2(lp->scissor.miny, 0);
 195       lp->cliprect.maxx = MIN2(lp->scissor.maxx, surfWidth);
 196       lp->cliprect.maxy = MIN2(lp->scissor.maxy, surfHeight);
 197    }
 198    else {
 199       /* clip to surface bounds */
 200       lp->cliprect.minx = 0;
 201       lp->cliprect.miny = 0;
 202       lp->cliprect.maxx = surfWidth;
 203       lp->cliprect.maxy = surfHeight;
 204    }
 205 }
 206
 207
 208 static void
 209 update_tgsi_samplers( struct llvmpipe_context *llvmpipe )
 210 {
 211    unsigned i;
 212
 213    /* vertex shader samplers */
 214    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 215       llvmpipe->tgsi.vert_samplers[i].sampler = llvmpipe->sampler[i];
 216       llvmpipe->tgsi.vert_samplers[i].texture = llvmpipe->texture[i];
 217       llvmpipe->tgsi.vert_samplers[i].base.get_samples = lp_get_samples;
 218    }
 219
 220    /* fragment shader samplers */
 221    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 222       llvmpipe->tgsi.frag_samplers[i].sampler = llvmpipe->sampler[i];
 223       llvmpipe->tgsi.frag_samplers[i].texture = llvmpipe->texture[i];
 224       llvmpipe->tgsi.frag_samplers[i].base.get_samples = lp_get_samples;
 225    }
 226
 227    llvmpipe->jit_context.samplers = (struct tgsi_sampler **)llvmpipe->tgsi.frag_samplers_list;
 228 }
 229
 230 static void
 231 update_culling()
 232 {
 233    if (lp->reduced_api_prim == PIPE_PRIM_TRIANGLES &&
 234        lp->rasterizer->fill_cw == PIPE_POLYGON_MODE_FILL &&
 235        lp->rasterizer->fill_ccw == PIPE_POLYGON_MODE_FILL) {
 236       /* we'll do culling */
 237       setup->winding = lp->rasterizer->cull_mode;
 238    }
 239    else {
 240       /* 'draw' will do culling */
 241       setup->winding = PIPE_WINDING_NONE;
 242    }
 243 }
 244
 245
 246 /* Hopefully this will remain quite simple, otherwise need to pull in
 247  * something like the state tracker mechanism.
 248  */
 249 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 250 {
 251    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 252
 253    /* Check for updated textures.
 254     */
 255    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 256       llvmpipe->tex_timestamp = lp_screen->timestamp;
 257       llvmpipe->dirty |= LP_NEW_TEXTURE;
 258    }
 259
 260    if (llvmpipe->dirty & (LP_NEW_SAMPLER |
 261                           LP_NEW_TEXTURE))
 262       update_tgsi_samplers( llvmpipe );
 263
 264    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 265                           LP_NEW_FS |
 266                           LP_NEW_VS))
 267       invalidate_vertex_layout( llvmpipe );
 268
 269    if (llvmpipe->dirty & (LP_NEW_SCISSOR |
 270                           LP_NEW_RASTERIZER |
 271                           LP_NEW_FRAMEBUFFER))
 272       compute_cliprect(llvmpipe);
 273
 274    if (llvmpipe->dirty & (LP_NEW_FS |
 275                           LP_NEW_BLEND |
 276                           LP_NEW_DEPTH_STENCIL_ALPHA |
 277                           LP_NEW_SAMPLER |
 278                           LP_NEW_TEXTURE))
 279       llvmpipe_update_fs( llvmpipe );
 280
 281
 282    llvmpipe->dirty = 0;
 283 }
 284
 285
 286 void llvmpipe_prepare( )
 287 {
 288    struct llvmpipe_context *lp = setup->llvmpipe;
 289
 290    if (lp->dirty) {
 291       llvmpipe_update_derived(lp);
 292    }
 293
 294 }