src/gallium/drivers/llvmpipe/lp_state_derived.c

   1 /**************************************************************************
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   3  * Copyright 2003 VMware, Inc.
   4  * All Rights Reserved.
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   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  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.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  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    int vs_index;
  54    uint i;
  55
  56    draw_prepare_shader_outputs(llvmpipe->draw);
  57
  58    llvmpipe->color_slot[0] = 0;
  59    llvmpipe->color_slot[1] = 0;
  60    llvmpipe->bcolor_slot[0] = 0;
  61    llvmpipe->bcolor_slot[1] = 0;
  62    llvmpipe->viewport_index_slot = 0;
  63    llvmpipe->layer_slot = 0;
  64    llvmpipe->face_slot = 0;
  65    llvmpipe->psize_slot = 0;
  66
  67    /*
  68     * Match FS inputs against VS outputs, emitting the necessary
  69     * attributes.  Could cache these structs and look them up with a
  70     * combination of fragment shader, vertex shader ids.
  71     */
  72
  73    vinfo->num_attribs = 0;
  74
  75    vs_index = draw_find_shader_output(llvmpipe->draw,
  76                                       TGSI_SEMANTIC_POSITION,
  77                                       0);
  78
  79    draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, vs_index);
  80
  81    for (i = 0; i < lpfs->info.base.num_inputs; i++) {
  82       /*
  83        * Search for each input in current vs output:
  84        */
  85
  86       vs_index = draw_find_shader_output(llvmpipe->draw,
  87                                          lpfs->info.base.input_semantic_name[i],
  88                                          lpfs->info.base.input_semantic_index[i]);
  89
  90       if (lpfs->info.base.input_semantic_name[i] == TGSI_SEMANTIC_COLOR &&
  91           lpfs->info.base.input_semantic_index[i] < 2) {
  92          int idx = lpfs->info.base.input_semantic_index[i];
  93          llvmpipe->color_slot[idx] = vinfo->num_attribs;
  94       }
  95
  96       if (lpfs->info.base.input_semantic_name[i] == TGSI_SEMANTIC_FACE) {
  97          llvmpipe->face_slot = vinfo->num_attribs;
  98          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT, vs_index);
  99       } else if (lpfs->info.base.input_semantic_name[i] == TGSI_SEMANTIC_PRIMID) {
 100          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT, vs_index);
 101       /*
 102        * For vp index and layer, if the fs requires them but the vs doesn't
 103        * provide them, store the slot - we'll later replace the data directly
 104        * with zero (as required by ARB_fragment_layer_viewport). This is
 105        * because draw itself just redirects them to whatever was at output 0.
 106        * We'll also store the real vpindex/layer slot for setup use.
 107        */
 108       } else if (lpfs->info.base.input_semantic_name[i] ==
 109                  TGSI_SEMANTIC_VIEWPORT_INDEX) {
 110          if (vs_index >= 0) {
 111             llvmpipe->viewport_index_slot = vinfo->num_attribs;
 112          }
 113          else {
 114             llvmpipe->fake_vpindex_slot = vinfo->num_attribs;
 115          }
 116          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT, vs_index);
 117       } else if (lpfs->info.base.input_semantic_name[i] == TGSI_SEMANTIC_LAYER) {
 118          if (vs_index >= 0) {
 119             llvmpipe->layer_slot = vinfo->num_attribs;
 120          }
 121          else {
 122             llvmpipe->fake_layer_slot = vinfo->num_attribs;
 123          }
 124          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT, vs_index);
 125       } else {
 126          /*
 127           * Emit the requested fs attribute for all but position.
 128           */
 129          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, vs_index);
 130       }
 131    }
 132
 133    /* Figure out if we need bcolor as well.
 134     */
 135    for (i = 0; i < 2; i++) {
 136       vs_index = draw_find_shader_output(llvmpipe->draw,
 137                                          TGSI_SEMANTIC_BCOLOR, i);
 138
 139       if (vs_index >= 0) {
 140          llvmpipe->bcolor_slot[i] = vinfo->num_attribs;
 141          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, vs_index);
 142       }
 143    }
 144
 145    /* Figure out if we need pointsize as well.
 146     */
 147    vs_index = draw_find_shader_output(llvmpipe->draw,
 148                                       TGSI_SEMANTIC_PSIZE, 0);
 149
 150    if (vs_index >= 0) {
 151       llvmpipe->psize_slot = vinfo->num_attribs;
 152       draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT, vs_index);
 153    }
 154
 155    /* Figure out if we need viewport index (if it wasn't already in fs input) */
 156    if (llvmpipe->viewport_index_slot == 0) {
 157       vs_index = draw_find_shader_output(llvmpipe->draw,
 158                                          TGSI_SEMANTIC_VIEWPORT_INDEX,
 159                                          0);
 160       if (vs_index >= 0) {
 161          llvmpipe->viewport_index_slot = vinfo->num_attribs;
 162          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT, vs_index);
 163       }
 164    }
 165
 166    /* Figure out if we need layer (if it wasn't already in fs input) */
 167    if (llvmpipe->layer_slot == 0) {
 168       vs_index = draw_find_shader_output(llvmpipe->draw,
 169                                          TGSI_SEMANTIC_LAYER,
 170                                          0);
 171       if (vs_index >= 0) {
 172          llvmpipe->layer_slot = vinfo->num_attribs;
 173          draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_CONSTANT, vs_index);
 174       }
 175    }
 176
 177    draw_compute_vertex_size(vinfo);
 178    lp_setup_set_vertex_info(llvmpipe->setup, vinfo);
 179 }
 180
 181
 182 /**
 183  * Handle state changes.
 184  * Called just prior to drawing anything (pipe::draw_arrays(), etc).
 185  *
 186  * Hopefully this will remain quite simple, otherwise need to pull in
 187  * something like the state tracker mechanism.
 188  */
 189 void llvmpipe_update_derived( struct llvmpipe_context *llvmpipe )
 190 {
 191    struct llvmpipe_screen *lp_screen = llvmpipe_screen(llvmpipe->pipe.screen);
 192
 193    /* Check for updated textures.
 194     */
 195    if (llvmpipe->tex_timestamp != lp_screen->timestamp) {
 196       llvmpipe->tex_timestamp = lp_screen->timestamp;
 197       llvmpipe->dirty |= LP_NEW_SAMPLER_VIEW;
 198    }
 199
 200    if (llvmpipe->dirty & (LP_NEW_RASTERIZER |
 201                           LP_NEW_FS |
 202                           LP_NEW_VS))
 203       compute_vertex_info( llvmpipe );
 204
 205    if (llvmpipe->dirty & (LP_NEW_FS |
 206                           LP_NEW_FRAMEBUFFER |
 207                           LP_NEW_BLEND |
 208                           LP_NEW_SCISSOR |
 209                           LP_NEW_DEPTH_STENCIL_ALPHA |
 210                           LP_NEW_RASTERIZER |
 211                           LP_NEW_SAMPLER |
 212                           LP_NEW_SAMPLER_VIEW |
 213                           LP_NEW_OCCLUSION_QUERY))
 214       llvmpipe_update_fs( llvmpipe );
 215
 216    if (llvmpipe->dirty & (LP_NEW_RASTERIZER)) {
 217       boolean discard =
 218          (llvmpipe->sample_mask & 1) == 0 ||
 219          (llvmpipe->rasterizer ? llvmpipe->rasterizer->rasterizer_discard : FALSE);
 220
 221       lp_setup_set_rasterizer_discard(llvmpipe->setup, discard);
 222    }
 223
 224    if (llvmpipe->dirty & (LP_NEW_FS |
 225                           LP_NEW_FRAMEBUFFER |
 226                           LP_NEW_RASTERIZER))
 227       llvmpipe_update_setup( llvmpipe );
 228
 229    if (llvmpipe->dirty & LP_NEW_BLEND_COLOR)
 230       lp_setup_set_blend_color(llvmpipe->setup,
 231                                &llvmpipe->blend_color);
 232
 233    if (llvmpipe->dirty & LP_NEW_SCISSOR)
 234       lp_setup_set_scissors(llvmpipe->setup, llvmpipe->scissors);
 235
 236    if (llvmpipe->dirty & LP_NEW_DEPTH_STENCIL_ALPHA) {
 237       lp_setup_set_alpha_ref_value(llvmpipe->setup,
 238                                    llvmpipe->depth_stencil->alpha.ref_value);
 239       lp_setup_set_stencil_ref_values(llvmpipe->setup,
 240                                       llvmpipe->stencil_ref.ref_value);
 241    }
 242
 243    if (llvmpipe->dirty & LP_NEW_CONSTANTS)
 244       lp_setup_set_fs_constants(llvmpipe->setup,
 245                                 Elements(llvmpipe->constants[PIPE_SHADER_FRAGMENT]),
 246                                 llvmpipe->constants[PIPE_SHADER_FRAGMENT]);
 247
 248    if (llvmpipe->dirty & (LP_NEW_SAMPLER_VIEW))
 249       lp_setup_set_fragment_sampler_views(llvmpipe->setup,
 250                                           llvmpipe->num_sampler_views[PIPE_SHADER_FRAGMENT],
 251                                           llvmpipe->sampler_views[PIPE_SHADER_FRAGMENT]);
 252
 253    if (llvmpipe->dirty & (LP_NEW_SAMPLER))
 254       lp_setup_set_fragment_sampler_state(llvmpipe->setup,
 255                                           llvmpipe->num_samplers[PIPE_SHADER_FRAGMENT],
 256                                           llvmpipe->samplers[PIPE_SHADER_FRAGMENT]);
 257
 258    if (llvmpipe->dirty & LP_NEW_VIEWPORT) {
 259       /*
 260        * Update setup and fragment's view of the active viewport state.
 261        *
 262        * XXX TODO: It is possible to only loop over the active viewports
 263        *           instead of all viewports (PIPE_MAX_VIEWPORTS).
 264        */
 265       lp_setup_set_viewports(llvmpipe->setup,
 266                              PIPE_MAX_VIEWPORTS,
 267                              llvmpipe->viewports);
 268    }
 269
 270    llvmpipe->dirty = 0;
 271 }
 272