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[1 + PIPE_MAX_SHADER_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
  78       /* This can be pre-computed, except for flatshade:
  79        */
  80       switch (lpfs->info.input_semantic_name[i]) {
  81       case TGSI_SEMANTIC_FACE:
  82          inputs[i].interp = LP_INTERP_FACING;
  83          break;
  84       case TGSI_SEMANTIC_POSITION:
  85          /* Position was already emitted above
  86           */
  87          inputs[i].interp = LP_INTERP_POSITION;
  88          inputs[i].src_index = 0;
  89          continue;
  90       case TGSI_SEMANTIC_COLOR:
  91          /* Colors are linearly inputs[i].interpolated in the fragment shader
  92           * even when flatshading is active.  This just tells the
  93           * setup module to use coefficients with ddx==0 and
  94           * ddy==0.
  95           */
  96          if (llvmpipe->rasterizer->flatshade)
  97             inputs[i].interp = LP_INTERP_CONSTANT;
  98          else
  99             inputs[i].interp = LP_INTERP_LINEAR;
 100          break;
 101
 102       default:
 103          switch (lpfs->info.input_interpolate[i]) {
 104          case TGSI_INTERPOLATE_CONSTANT:
 105             inputs[i].interp = LP_INTERP_CONSTANT;
 106             break;
 107          case TGSI_INTERPOLATE_LINEAR:
 108             inputs[i].interp = LP_INTERP_LINEAR;
 109             break;
 110          case TGSI_INTERPOLATE_PERSPECTIVE:
 111             inputs[i].interp = LP_INTERP_PERSPECTIVE;
 112             break;
 113          default:
 114             assert(0);
 115             break;
 116          }
 117       }
 118
 119       /*
 120        * Emit the requested fs attribute for all but position.
 121        */
 122
 123       inputs[i].src_index = vinfo->num_attribs;
 124       draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, vs_index);
 125    }
 126
 127    draw_compute_vertex_size(vinfo);
 128
 129    lp_setup_set_vertex_info(llvmpipe->setup, vinfo);
 130
 131    lp_setup_set_fs_inputs(llvmpipe->setup,
 132                           inputs,
 133                           lpfs->info.num_inputs);
 134 }
 135
 136
 137 /**
 138  * Handle state changes.
 139  * Called just prior to drawing anything (pipe::draw_arrays(), etc).
 140  *
 141  * Hopefully this will remain quite simple, otherwise need to pull in
 142  * something like the state tracker mechanism.
 143  */
 144 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 145 {
 146    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 147
 148    /* Check for updated textures.
 149     */
 150    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 151       llvmpipe->tex_timestamp = lp_screen->timestamp;
 152       llvmpipe->dirty |= LP_NEW_SAMPLER_VIEW;
 153    }
 154
 155    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 156                           LP_NEW_FS |
 157                           LP_NEW_VS))
 158       compute_vertex_info( llvmpipe );
 159
 160    if (llvmpipe->dirty & (LP_NEW_FS |
 161                           LP_NEW_BLEND |
 162                           LP_NEW_SCISSOR |
 163                           LP_NEW_DEPTH_STENCIL_ALPHA |
 164                           LP_NEW_RASTERIZER |
 165                           LP_NEW_SAMPLER |
 166                           LP_NEW_SAMPLER_VIEW))
 167       llvmpipe_update_fs( llvmpipe );
 168
 169    if (llvmpipe->dirty & LP_NEW_BLEND_COLOR)
 170       lp_setup_set_blend_color(llvmpipe->setup,
 171                                &llvmpipe->blend_color);
 172
 173    if (llvmpipe->dirty & LP_NEW_SCISSOR)
 174       lp_setup_set_scissor(llvmpipe->setup, &llvmpipe->scissor);
 175
 176    if (llvmpipe->dirty & LP_NEW_DEPTH_STENCIL_ALPHA) {
 177       lp_setup_set_alpha_ref_value(llvmpipe->setup,
 178                                    llvmpipe->depth_stencil->alpha.ref_value);
 179       lp_setup_set_stencil_ref_values(llvmpipe->setup,
 180                                       llvmpipe->stencil_ref.ref_value);
 181    }
 182
 183    if (llvmpipe->dirty & LP_NEW_CONSTANTS)
 184       lp_setup_set_fs_constants(llvmpipe->setup,
 185                                 llvmpipe->constants[PIPE_SHADER_FRAGMENT]);
 186
 187    if (llvmpipe->dirty & LP_NEW_SAMPLER_VIEW)
 188       lp_setup_set_fragment_sampler_views(llvmpipe->setup,
 189                                           llvmpipe->num_fragment_sampler_views,
 190                                           llvmpipe->fragment_sampler_views);
 191
 192    llvmpipe->dirty = 0;
 193 }
 194