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_setup.h"
  37 #include "lp_state.h"
  38
  39
  40
  41 /**
  42  * The vertex info describes how to convert the post-transformed vertices
  43  * (simple float[][4]) used by the 'draw' module into vertices for
  44  * rasterization.
  45  *
  46  * This function validates the vertex layout.
  47  */
  48 static void
  49 compute_vertex_info(struct llvmpipe_context *llvmpipe)
  50 {
  51    const struct lp_fragment_shader *lpfs = llvmpipe->fs;
  52    struct vertex_info *vinfo = &llvmpipe->vertex_info;
  53    const uint num = draw_num_shader_outputs(llvmpipe->draw);
  54    uint i;
  55
  56    /* Tell setup to tell the draw module to simply emit the whole
  57     * post-xform vertex as-is.
  58     *
  59     * Not really sure if this is the best approach.
  60     */
  61    vinfo->num_attribs = 0;
  62    for (i = 0; i < num; i++) {
  63       draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, i);
  64    }
  65    draw_compute_vertex_size(vinfo);
  66
  67
  68    lp_setup_set_vertex_info(llvmpipe->setup, vinfo);
  69
  70 /*
  71    llvmpipe->psize_slot = draw_find_vs_output(llvmpipe->draw,
  72                                               TGSI_SEMANTIC_PSIZE, 0);
  73 */
  74
  75    /* Now match FS inputs against emitted vertex data.  It's also
  76     * entirely possible to just have a fixed layout for FS input,
  77     * determined by the fragment shader itself, and adjust the draw
  78     * outputs to match that.
  79     */
  80    {
  81       struct lp_shader_input inputs[PIPE_MAX_SHADER_INPUTS];
  82
  83       for (i = 0; i < lpfs->info.num_inputs; i++) {
  84
  85          /* This can be precomputed, except for flatshade:
  86           */
  87          switch (lpfs->info.input_semantic_name[i]) {
  88          case TGSI_SEMANTIC_FACE:
  89             inputs[i].interp = LP_INTERP_FACING;
  90             break;
  91          case TGSI_SEMANTIC_POSITION:
  92             inputs[i].interp = LP_INTERP_POSITION;
  93             break;
  94          case TGSI_SEMANTIC_COLOR:
  95             /* Colors are linearly interpolated in the fragment shader
  96              * even when flatshading is active.  This just tells the
  97              * setup module to use coefficients with ddx==0 and
  98              * ddy==0.
  99              */
 100             if (llvmpipe->rasterizer->flatshade)
 101                inputs[i].interp = LP_INTERP_CONSTANT;
 102             else
 103                inputs[i].interp = LP_INTERP_LINEAR;
 104             break;
 105
 106          default:
 107             switch (lpfs->info.input_interpolate[i]) {
 108             case TGSI_INTERPOLATE_CONSTANT:
 109                inputs[i].interp = LP_INTERP_CONSTANT;
 110                break;
 111             case TGSI_INTERPOLATE_LINEAR:
 112                inputs[i].interp = LP_INTERP_LINEAR;
 113                break;
 114             case TGSI_INTERPOLATE_PERSPECTIVE:
 115                inputs[i].interp = LP_INTERP_PERSPECTIVE;
 116                break;
 117             default:
 118                assert(0);
 119                break;
 120             }
 121          }
 122
 123          /* Search for each input in current vs output:
 124           */
 125          inputs[i].src_index =
 126             draw_find_shader_output(llvmpipe->draw,
 127                                     lpfs->info.input_semantic_name[i],
 128                                     lpfs->info.input_semantic_index[i]);
 129       }
 130
 131       lp_setup_set_fs_inputs(llvmpipe->setup,
 132                              inputs,
 133                              lpfs->info.num_inputs);
 134    }
 135 }
 136
 137
 138
 139 /**
 140  * Recompute cliprect from scissor bounds, scissor enable and surface size.
 141  */
 142 static void
 143 compute_cliprect(struct llvmpipe_context *lp)
 144 {
 145    /* LP_NEW_FRAMEBUFFER
 146     */
 147    uint surfWidth = lp->framebuffer.width;
 148    uint surfHeight = lp->framebuffer.height;
 149
 150    /* LP_NEW_RASTERIZER
 151     */
 152    if (lp->rasterizer->scissor) {
 153
 154       /* LP_NEW_SCISSOR
 155        *
 156        * clip to scissor rect:
 157        */
 158       lp->cliprect.minx = MAX2(lp->scissor.minx, 0);
 159       lp->cliprect.miny = MAX2(lp->scissor.miny, 0);
 160       lp->cliprect.maxx = MIN2(lp->scissor.maxx, surfWidth);
 161       lp->cliprect.maxy = MIN2(lp->scissor.maxy, surfHeight);
 162    }
 163    else {
 164       /* clip to surface bounds */
 165       lp->cliprect.minx = 0;
 166       lp->cliprect.miny = 0;
 167       lp->cliprect.maxx = surfWidth;
 168       lp->cliprect.maxy = surfHeight;
 169    }
 170 }
 171
 172
 173 /* Hopefully this will remain quite simple, otherwise need to pull in
 174  * something like the state tracker mechanism.
 175  */
 176 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 177 {
 178    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 179
 180    /* Check for updated textures.
 181     */
 182    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 183       llvmpipe->tex_timestamp = lp_screen->timestamp;
 184       llvmpipe->dirty |= LP_NEW_TEXTURE;
 185    }
 186
 187    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 188                           LP_NEW_FS |
 189                           LP_NEW_VS))
 190       compute_vertex_info( llvmpipe );
 191
 192    if (llvmpipe->dirty & (LP_NEW_SCISSOR |
 193                           LP_NEW_RASTERIZER |
 194                           LP_NEW_FRAMEBUFFER))
 195       compute_cliprect(llvmpipe);
 196
 197    if (llvmpipe->dirty & (LP_NEW_FS |
 198                           LP_NEW_BLEND |
 199                           LP_NEW_DEPTH_STENCIL_ALPHA |
 200                           LP_NEW_SAMPLER |
 201                           LP_NEW_TEXTURE))
 202       llvmpipe_update_fs( llvmpipe );
 203
 204    if (llvmpipe->dirty & LP_NEW_BLEND_COLOR)
 205       lp_setup_set_blend_color(llvmpipe->setup,
 206                                &llvmpipe->blend_color);
 207
 208    if (llvmpipe->dirty & LP_NEW_DEPTH_STENCIL_ALPHA)
 209       lp_setup_set_alpha_ref_value(llvmpipe->setup,
 210                                    llvmpipe->depth_stencil->alpha.ref_value);
 211
 212    if (llvmpipe->dirty & LP_NEW_CONSTANTS)
 213       lp_setup_set_fs_constants(llvmpipe->setup,
 214                                 llvmpipe->constants[PIPE_SHADER_FRAGMENT].buffer);
 215
 216    if (llvmpipe->dirty & LP_NEW_TEXTURE)
 217       lp_setup_set_sampler_textures(llvmpipe->setup,
 218                                     llvmpipe->num_textures,
 219                                     llvmpipe->texture);
 220
 221    llvmpipe->dirty = 0;
 222 }
 223