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       const enum interp_mode colorInterp
  69          = llvmpipe->rasterizer->flatshade ? INTERP_CONSTANT : INTERP_LINEAR;
  70       uint i;
  71
  72       if (llvmpipe->vbuf) {
  73          /* if using the post-transform vertex buffer, tell draw_vbuf to
  74           * simply emit the whole post-xform vertex as-is:
  75           */
  76          struct vertex_info *vinfo_vbuf = &llvmpipe->vertex_info_vbuf;
  77          const uint num = draw_num_vs_outputs(llvmpipe->draw);
  78          uint i;
  79
  80          /* No longer any need to try and emit draw vertex_header info.
  81           */
  82          vinfo_vbuf->num_attribs = 0;
  83          for (i = 0; i < num; i++) {
  84             draw_emit_vertex_attr(vinfo_vbuf, EMIT_4F, INTERP_PERSPECTIVE, i);
  85          }
  86          draw_compute_vertex_size(vinfo_vbuf);
  87       }
  88
  89       /*
  90        * Loop over fragment shader inputs, searching for the matching output
  91        * from the vertex shader.
  92        */
  93       vinfo->num_attribs = 0;
  94       for (i = 0; i < lpfs->info.num_inputs; i++) {
  95          int src;
  96          switch (lpfs->info.input_semantic_name[i]) {
  97          case TGSI_SEMANTIC_POSITION:
  98             src = draw_find_vs_output(llvmpipe->draw,
  99                                       TGSI_SEMANTIC_POSITION, 0);
 100             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_POS, src);
 101             break;
 102
 103          case TGSI_SEMANTIC_COLOR:
 104             src = draw_find_vs_output(llvmpipe->draw, TGSI_SEMANTIC_COLOR,
 105                                  lpfs->info.input_semantic_index[i]);
 106             draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
 107             break;
 108
 109          case TGSI_SEMANTIC_FOG:
 110             src = draw_find_vs_output(llvmpipe->draw, TGSI_SEMANTIC_FOG, 0);
 111             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 112             break;
 113
 114          case TGSI_SEMANTIC_GENERIC:
 115          case TGSI_SEMANTIC_FACE:
 116             /* this includes texcoords and varying vars */
 117             src = draw_find_vs_output(llvmpipe->draw, TGSI_SEMANTIC_GENERIC,
 118                                       lpfs->info.input_semantic_index[i]);
 119             draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
 120             break;
 121
 122          default:
 123             assert(0);
 124          }
 125       }
 126
 127       llvmpipe->psize_slot = draw_find_vs_output(llvmpipe->draw,
 128                                                  TGSI_SEMANTIC_PSIZE, 0);
 129       if (llvmpipe->psize_slot > 0) {
 130          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 131                                llvmpipe->psize_slot);
 132       }
 133
 134       draw_compute_vertex_size(vinfo);
 135    }
 136
 137    return vinfo;
 138 }
 139
 140
 141 /**
 142  * Called from vbuf module.
 143  *
 144  * Note that there's actually two different vertex layouts in llvmpipe.
 145  *
 146  * The normal one is computed in llvmpipe_get_vertex_info() above and is
 147  * used by the point/line/tri "setup" code.
 148  *
 149  * The other one (this one) is only used by the vbuf module (which is
 150  * not normally used by default but used in testing).  For the vbuf module,
 151  * we basically want to pass-through the draw module's vertex layout as-is.
 152  * When the llvmpipe vbuf code begins drawing, the normal vertex layout
 153  * will come into play again.
 154  */
 155 struct vertex_info *
 156 llvmpipe_get_vbuf_vertex_info(struct llvmpipe_context *llvmpipe)
 157 {
 158    (void) llvmpipe_get_vertex_info(llvmpipe);
 159    return &llvmpipe->vertex_info_vbuf;
 160 }
 161
 162
 163 /**
 164  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 165  */
 166 static void
 167 compute_cliprect(struct llvmpipe_context *lp)
 168 {
 169    /* LP_NEW_FRAMEBUFFER
 170     */
 171    uint surfWidth = lp->framebuffer.width;
 172    uint surfHeight = lp->framebuffer.height;
 173
 174    /* LP_NEW_RASTERIZER
 175     */
 176    if (lp->rasterizer->scissor) {
 177
 178       /* LP_NEW_SCISSOR
 179        *
 180        * clip to scissor rect:
 181        */
 182       lp->cliprect.minx = MAX2(lp->scissor.minx, 0);
 183       lp->cliprect.miny = MAX2(lp->scissor.miny, 0);
 184       lp->cliprect.maxx = MIN2(lp->scissor.maxx, surfWidth);
 185       lp->cliprect.maxy = MIN2(lp->scissor.maxy, surfHeight);
 186    }
 187    else {
 188       /* clip to surface bounds */
 189       lp->cliprect.minx = 0;
 190       lp->cliprect.miny = 0;
 191       lp->cliprect.maxx = surfWidth;
 192       lp->cliprect.maxy = surfHeight;
 193    }
 194 }
 195
 196
 197 static void
 198 update_tgsi_samplers( struct llvmpipe_context *llvmpipe )
 199 {
 200    unsigned i;
 201
 202    /* vertex shader samplers */
 203    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 204       llvmpipe->tgsi.vert_samplers[i].sampler = llvmpipe->sampler[i];
 205       llvmpipe->tgsi.vert_samplers[i].texture = llvmpipe->texture[i];
 206       llvmpipe->tgsi.frag_samplers[i].base.get_samples = lp_get_samples;
 207    }
 208
 209    /* fragment shader samplers */
 210    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 211       llvmpipe->tgsi.frag_samplers[i].sampler = llvmpipe->sampler[i];
 212       llvmpipe->tgsi.frag_samplers[i].texture = llvmpipe->texture[i];
 213       llvmpipe->tgsi.frag_samplers[i].base.get_samples = lp_get_samples;
 214    }
 215
 216    for (i = 0; i < PIPE_MAX_SAMPLERS; i++) {
 217       lp_tex_tile_cache_validate_texture( llvmpipe->tex_cache[i] );
 218    }
 219
 220    llvmpipe->jit_context.samplers = (struct tgsi_sampler **)llvmpipe->tgsi.frag_samplers_list;
 221 }
 222
 223 /* Hopefully this will remain quite simple, otherwise need to pull in
 224  * something like the state tracker mechanism.
 225  */
 226 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 227 {
 228    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 229
 230    /* Check for updated textures.
 231     */
 232    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 233       llvmpipe->tex_timestamp = lp_screen->timestamp;
 234       llvmpipe->dirty |= LP_NEW_TEXTURE;
 235    }
 236
 237    if (llvmpipe->dirty & (LP_NEW_SAMPLER |
 238                           LP_NEW_TEXTURE))
 239       update_tgsi_samplers( llvmpipe );
 240
 241    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 242                           LP_NEW_FS |
 243                           LP_NEW_VS))
 244       invalidate_vertex_layout( llvmpipe );
 245
 246    if (llvmpipe->dirty & (LP_NEW_SCISSOR |
 247                           LP_NEW_RASTERIZER |
 248                           LP_NEW_FRAMEBUFFER))
 249       compute_cliprect(llvmpipe);
 250
 251    if (llvmpipe->dirty & (LP_NEW_FS |
 252                           LP_NEW_BLEND |
 253                           LP_NEW_DEPTH_STENCIL_ALPHA))
 254       llvmpipe_update_fs( llvmpipe );
 255
 256
 257    llvmpipe->dirty = 0;
 258 }