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    struct lp_shader_input *inputs = llvmpipe->inputs;
  54    unsigned vs_index;
  55    uint i;
  56
  57    /*
  58     * Match FS inputs against VS outputs, emitting the necessary attributes.
  59     */
  60
  61    vinfo->num_attribs = 0;
  62
  63    vs_index = draw_find_shader_output(llvmpipe->draw,
  64                                        TGSI_SEMANTIC_POSITION,
  65                                        0);
  66
  67    draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, vs_index);
  68
  69    for (i = 0; i < lpfs->info.num_inputs; i++) {
  70       /*
  71        * Search for each input in current vs output:
  72        */
  73
  74       vs_index = draw_find_shader_output(llvmpipe->draw,
  75                                          lpfs->info.input_semantic_name[i],
  76                                          lpfs->info.input_semantic_index[i]);
  77       if (vs_index < 0) {
  78          /*
  79           * This can happen with sprite coordinates - the vertex
  80           * shader doesn't need to provide an output as we generate
  81           * them internally.  However, lets keep pretending that there
  82           * is something there to not confuse other code.
  83           */
  84          vs_index = 0;
  85       }
  86
  87       /* This can be pre-computed, except for flatshade:
  88        */
  89       inputs[i].usage_mask = lpfs->info.input_usage_mask[i];
  90
  91       switch (lpfs->info.input_interpolate[i]) {
  92       case TGSI_INTERPOLATE_CONSTANT:
  93          inputs[i].interp = LP_INTERP_CONSTANT;
  94          break;
  95       case TGSI_INTERPOLATE_LINEAR:
  96          inputs[i].interp = LP_INTERP_LINEAR;
  97          break;
  98       case TGSI_INTERPOLATE_PERSPECTIVE:
  99          inputs[i].interp = LP_INTERP_PERSPECTIVE;
 100          break;
 101       default:
 102          assert(0);
 103          break;
 104       }
 105
 106       switch (lpfs->info.input_semantic_name[i]) {
 107       case TGSI_SEMANTIC_FACE:
 108          inputs[i].interp = LP_INTERP_FACING;
 109          break;
 110       case TGSI_SEMANTIC_POSITION:
 111          /* Position was already emitted above
 112           */
 113          inputs[i].interp = LP_INTERP_POSITION;
 114          inputs[i].src_index = 0;
 115          continue;
 116       case TGSI_SEMANTIC_COLOR:
 117          /* Colors are linearly inputs[i].interpolated in the fragment shader
 118           * even when flatshading is active.  This just tells the
 119           * setup module to use coefficients with ddx==0 and
 120           * ddy==0.
 121           */
 122          if (llvmpipe->rasterizer->flatshade)
 123             inputs[i].interp = LP_INTERP_CONSTANT;
 124          break;
 125
 126       default:
 127          break;
 128       }
 129
 130       /*
 131        * Emit the requested fs attribute for all but position.
 132        */
 133
 134       inputs[i].src_index = vinfo->num_attribs;
 135       draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, vs_index);
 136    }
 137
 138    /* Figure out if we need pointsize as well.
 139     */
 140    vs_index = draw_find_shader_output(llvmpipe->draw,
 141                                       TGSI_SEMANTIC_PSIZE, 0);
 142
 143    if (vs_index > 0) {
 144       llvmpipe->psize_slot = vinfo->num_attribs;
 145       draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT, vs_index);
 146    }
 147
 148    llvmpipe->num_inputs = lpfs->info.num_inputs;
 149
 150    draw_compute_vertex_size(vinfo);
 151
 152    lp_setup_set_vertex_info(llvmpipe->setup, vinfo);
 153
 154    lp_setup_set_fs_inputs(llvmpipe->setup,
 155                           inputs,
 156                           lpfs->info.num_inputs);
 157 }
 158
 159
 160 /**
 161  * Handle state changes.
 162  * Called just prior to drawing anything (pipe::draw_arrays(), etc).
 163  *
 164  * Hopefully this will remain quite simple, otherwise need to pull in
 165  * something like the state tracker mechanism.
 166  */
 167 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 168 {
 169    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 170
 171    /* Check for updated textures.
 172     */
 173    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 174       llvmpipe->tex_timestamp = lp_screen->timestamp;
 175       llvmpipe->dirty |= LP_NEW_SAMPLER_VIEW;
 176    }
 177
 178    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 179                           LP_NEW_FS |
 180                           LP_NEW_VS))
 181       compute_vertex_info( llvmpipe );
 182
 183    if (llvmpipe->dirty & (LP_NEW_FS |
 184                           LP_NEW_BLEND |
 185                           LP_NEW_SCISSOR |
 186                           LP_NEW_DEPTH_STENCIL_ALPHA |
 187                           LP_NEW_RASTERIZER |
 188                           LP_NEW_SAMPLER |
 189                           LP_NEW_SAMPLER_VIEW |
 190                           LP_NEW_QUERY))
 191       llvmpipe_update_fs( llvmpipe );
 192
 193    if (llvmpipe->dirty & LP_NEW_BLEND_COLOR)
 194       lp_setup_set_blend_color(llvmpipe->setup,
 195                                &llvmpipe->blend_color);
 196
 197    if (llvmpipe->dirty & LP_NEW_SCISSOR)
 198       lp_setup_set_scissor(llvmpipe->setup, &llvmpipe->scissor);
 199
 200    if (llvmpipe->dirty & LP_NEW_DEPTH_STENCIL_ALPHA) {
 201       lp_setup_set_alpha_ref_value(llvmpipe->setup,
 202                                    llvmpipe->depth_stencil->alpha.ref_value);
 203       lp_setup_set_stencil_ref_values(llvmpipe->setup,
 204                                       llvmpipe->stencil_ref.ref_value);
 205    }
 206
 207    if (llvmpipe->dirty & LP_NEW_CONSTANTS)
 208       lp_setup_set_fs_constants(llvmpipe->setup,
 209                                 llvmpipe->constants[PIPE_SHADER_FRAGMENT][0]);
 210
 211    if (llvmpipe->dirty & (LP_NEW_SAMPLER_VIEW |
 212                           LP_NEW_SAMPLER))
 213       lp_setup_set_fragment_sampler_views(llvmpipe->setup,
 214                                           llvmpipe->num_fragment_sampler_views,
 215                                           llvmpipe->fragment_sampler_views,
 216                                           llvmpipe->sampler);
 217
 218    llvmpipe->dirty = 0;
 219 }
 220