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  * Handle state changes.
 140  * Called just prior to drawing anything (pipe::draw_arrays(), etc).
 141  *
 142  * Hopefully this will remain quite simple, otherwise need to pull in
 143  * something like the state tracker mechanism.
 144  */
 145 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 146 {
 147    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 148
 149    /* Check for updated textures.
 150     */
 151    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 152       llvmpipe->tex_timestamp = lp_screen->timestamp;
 153       llvmpipe->dirty |= LP_NEW_SAMPLER_VIEW;
 154    }
 155
 156    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 157                           LP_NEW_FS |
 158                           LP_NEW_VS))
 159       compute_vertex_info( llvmpipe );
 160
 161    if (llvmpipe->dirty & (LP_NEW_FS |
 162                           LP_NEW_BLEND |
 163                           LP_NEW_SCISSOR |
 164                           LP_NEW_DEPTH_STENCIL_ALPHA |
 165                           LP_NEW_RASTERIZER |
 166                           LP_NEW_SAMPLER |
 167                           LP_NEW_SAMPLER_VIEW))
 168       llvmpipe_update_fs( llvmpipe );
 169
 170    if (llvmpipe->dirty & LP_NEW_BLEND_COLOR)
 171       lp_setup_set_blend_color(llvmpipe->setup,
 172                                &llvmpipe->blend_color);
 173
 174    if (llvmpipe->dirty & LP_NEW_SCISSOR)
 175       lp_setup_set_scissor(llvmpipe->setup, &llvmpipe->scissor);
 176
 177    if (llvmpipe->dirty & LP_NEW_DEPTH_STENCIL_ALPHA) {
 178       lp_setup_set_alpha_ref_value(llvmpipe->setup,
 179                                    llvmpipe->depth_stencil->alpha.ref_value);
 180       lp_setup_set_stencil_ref_values(llvmpipe->setup,
 181                                       llvmpipe->stencil_ref.ref_value);
 182    }
 183
 184    if (llvmpipe->dirty & LP_NEW_CONSTANTS)
 185       lp_setup_set_fs_constants(llvmpipe->setup,
 186                                 llvmpipe->constants[PIPE_SHADER_FRAGMENT]);
 187
 188    if (llvmpipe->dirty & LP_NEW_SAMPLER_VIEW)
 189       lp_setup_set_fragment_sampler_views(llvmpipe->setup,
 190                                           llvmpipe->num_fragment_sampler_views,
 191                                           llvmpipe->fragment_sampler_views);
 192
 193    llvmpipe->dirty = 0;
 194 }
 195