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       struct vertex_info *vinfo_vbuf = &llvmpipe->vertex_info_vbuf;
  68       const uint num = draw_current_shader_outputs(llvmpipe->draw);
  69       uint i;
  70
  71       /* Tell draw_vbuf to simply emit the whole post-xform vertex
  72        * as-is.  No longer any need to try and emit draw vertex_header
  73        * info.
  74        */
  75       vinfo_vbuf->num_attribs = 0;
  76       for (i = 0; i < num; i++) {
  77          draw_emit_vertex_attr(vinfo_vbuf, EMIT_4F, INTERP_PERSPECTIVE, i);
  78       }
  79       draw_compute_vertex_size(vinfo_vbuf);
  80
  81       /*
  82        * Loop over fragment shader inputs, searching for the matching output
  83        * from the vertex shader.
  84        */
  85       vinfo->num_attribs = 0;
  86       for (i = 0; i < lpfs->info.num_inputs; i++) {
  87          int src;
  88          enum interp_mode interp;
  89
  90          switch (lpfs->info.input_interpolate[i]) {
  91          case TGSI_INTERPOLATE_CONSTANT:
  92             interp = INTERP_CONSTANT;
  93             break;
  94          case TGSI_INTERPOLATE_LINEAR:
  95             interp = INTERP_LINEAR;
  96             break;
  97          case TGSI_INTERPOLATE_PERSPECTIVE:
  98             interp = INTERP_PERSPECTIVE;
  99             break;
 100          default:
 101             assert(0);
 102             interp = INTERP_LINEAR;
 103          }
 104
 105          switch (lpfs->info.input_semantic_name[i]) {
 106          case TGSI_SEMANTIC_POSITION:
 107             interp = INTERP_POS;
 108             break;
 109
 110          case TGSI_SEMANTIC_COLOR:
 111             if (llvmpipe->rasterizer->flatshade) {
 112                interp = INTERP_CONSTANT;
 113             }
 114             break;
 115          }
 116
 117          /* this includes texcoords and varying vars */
 118          src = draw_find_shader_output(llvmpipe->draw,
 119                                    lpfs->info.input_semantic_name[i],
 120                                    lpfs->info.input_semantic_index[i]);
 121          draw_emit_vertex_attr(vinfo, EMIT_4F, interp, src);
 122       }
 123
 124       llvmpipe->psize_slot = draw_find_shader_output(llvmpipe->draw,
 125                                                  TGSI_SEMANTIC_PSIZE, 0);
 126       if (llvmpipe->psize_slot > 0) {
 127          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT,
 128                                llvmpipe->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 llvmpipe.
 142  *
 143  * The normal one is computed in llvmpipe_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 llvmpipe vbuf code begins drawing, the normal vertex layout
 150  * will come into play again.
 151  */
 152 struct vertex_info *
 153 llvmpipe_get_vbuf_vertex_info(struct llvmpipe_context *llvmpipe)
 154 {
 155    (void) llvmpipe_get_vertex_info(llvmpipe);
 156    return &llvmpipe->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 llvmpipe_context *lp)
 165 {
 166    /* LP_NEW_FRAMEBUFFER
 167     */
 168    uint surfWidth = lp->framebuffer.width;
 169    uint surfHeight = lp->framebuffer.height;
 170
 171    /* LP_NEW_RASTERIZER
 172     */
 173    if (lp->rasterizer->scissor) {
 174
 175       /* LP_NEW_SCISSOR
 176        *
 177        * clip to scissor rect:
 178        */
 179       lp->cliprect.minx = MAX2(lp->scissor.minx, 0);
 180       lp->cliprect.miny = MAX2(lp->scissor.miny, 0);
 181       lp->cliprect.maxx = MIN2(lp->scissor.maxx, surfWidth);
 182       lp->cliprect.maxy = MIN2(lp->scissor.maxy, surfHeight);
 183    }
 184    else {
 185       /* clip to surface bounds */
 186       lp->cliprect.minx = 0;
 187       lp->cliprect.miny = 0;
 188       lp->cliprect.maxx = surfWidth;
 189       lp->cliprect.maxy = surfHeight;
 190    }
 191 }
 192
 193
 194 /* Hopefully this will remain quite simple, otherwise need to pull in
 195  * something like the state tracker mechanism.
 196  */
 197 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 198 {
 199    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 200
 201    /* Check for updated textures.
 202     */
 203    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 204       llvmpipe->tex_timestamp = lp_screen->timestamp;
 205       llvmpipe->dirty |= LP_NEW_TEXTURE;
 206    }
 207
 208    if (llvmpipe->dirty & (LP_NEW_SAMPLER |
 209                           LP_NEW_TEXTURE)) {
 210       /* TODO */
 211    }
 212
 213    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 214                           LP_NEW_FS |
 215                           LP_NEW_VS))
 216       invalidate_vertex_layout( llvmpipe );
 217
 218    if (llvmpipe->dirty & (LP_NEW_SCISSOR |
 219                           LP_NEW_RASTERIZER |
 220                           LP_NEW_FRAMEBUFFER))
 221       compute_cliprect(llvmpipe);
 222
 223    if (llvmpipe->dirty & (LP_NEW_FS |
 224                           LP_NEW_BLEND |
 225                           LP_NEW_DEPTH_STENCIL_ALPHA |
 226                           LP_NEW_SAMPLER |
 227                           LP_NEW_TEXTURE))
 228       llvmpipe_update_fs( llvmpipe );
 229
 230
 231    llvmpipe->dirty = 0;
 232 }