src/gallium/drivers/i965/brw_pipe_shader.c

   1 /*
   2  Copyright (C) Intel Corp.  2006.  All Rights Reserved.
   3  Intel funded Tungsten Graphics (http://www.tungstengraphics.com) to
   4  develop this 3D driver.
   5
   6  Permission is hereby granted, free of charge, to any person obtaining
   7  a 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, sublicense, 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
  16  portions of the Software.
  17
  18  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  21  IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  22  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  23  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  24  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25
  26  **********************************************************************/
  27  /*
  28   * Authors:
  29   *   Keith Whitwell <keith@tungstengraphics.com>
  30   */
  31
  32 #include "util/u_memory.h"
  33
  34 #include "tgsi/tgsi_parse.h"
  35 #include "tgsi/tgsi_scan.h"
  36
  37 #include "brw_context.h"
  38 #include "brw_util.h"
  39 #include "brw_wm.h"
  40
  41
  42 /**
  43  * Determine if the given shader uses complex features such as flow
  44  * conditionals, loops, subroutines.
  45  */
  46 static GLboolean has_flow_control(const struct tgsi_shader_info *info)
  47 {
  48     return (info->opcode_count[TGSI_OPCODE_ARL] > 0 ||
  49             info->opcode_count[TGSI_OPCODE_IF] > 0 ||
  50             info->opcode_count[TGSI_OPCODE_ENDIF] > 0 || /* redundant - IF */
  51             info->opcode_count[TGSI_OPCODE_CAL] > 0 ||
  52             info->opcode_count[TGSI_OPCODE_BRK] > 0 ||   /* redundant - BGNLOOP */
  53             info->opcode_count[TGSI_OPCODE_RET] > 0 ||   /* redundant - CAL */
  54             info->opcode_count[TGSI_OPCODE_BGNLOOP] > 0);
  55 }
  56
  57
  58
  59 static void brw_bind_fs_state( struct pipe_context *pipe, void *prog )
  60 {
  61    struct brw_context *brw = brw_context(pipe);
  62
  63    brw->curr.fragment_shader = (struct brw_fragment_shader *)prog;
  64    brw->state.dirty.mesa |= PIPE_NEW_FRAGMENT_SHADER;
  65 }
  66
  67 static void brw_bind_vs_state( struct pipe_context *pipe, void *prog )
  68 {
  69    struct brw_context *brw = brw_context(pipe);
  70
  71    brw->curr.vertex_shader = (struct brw_vertex_shader *)prog;
  72    brw->state.dirty.mesa |= PIPE_NEW_VERTEX_SHADER;
  73 }
  74
  75
  76
  77 static void *brw_create_fs_state( struct pipe_context *pipe,
  78                                   const struct pipe_shader_state *shader )
  79 {
  80    struct brw_context *brw = brw_context(pipe);
  81    struct brw_fragment_shader *fs;
  82    int i;
  83
  84    fs = CALLOC_STRUCT(brw_fragment_shader);
  85    if (fs == NULL)
  86       return NULL;
  87
  88    /* Duplicate tokens, scan shader
  89     */
  90    fs->id = brw->program_id++;
  91    fs->has_flow_control = has_flow_control(&fs->info);
  92
  93    fs->tokens = tgsi_dup_tokens(shader->tokens);
  94    if (fs->tokens == NULL)
  95       goto fail;
  96
  97    tgsi_scan_shader(fs->tokens, &fs->info);
  98
  99    for (i = 0; i < fs->info.num_inputs; i++)
 100       if (fs->info.input_semantic_name[i] == TGSI_SEMANTIC_POSITION)
 101          fs->uses_depth = 1;
 102
 103    if (fs->info.uses_kill)
 104       fs->iz_lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 105
 106    if (fs->info.writes_z)
 107       fs->iz_lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 108
 109    return (void *)fs;
 110
 111 fail:
 112    FREE(fs);
 113    return NULL;
 114 }
 115
 116
 117 static void *brw_create_vs_state( struct pipe_context *pipe,
 118                                   const struct pipe_shader_state *shader )
 119 {
 120    struct brw_context *brw = brw_context(pipe);
 121
 122    struct brw_vertex_shader *vs = CALLOC_STRUCT(brw_vertex_shader);
 123    if (vs == NULL)
 124       return NULL;
 125
 126    /* Duplicate tokens, scan shader
 127     */
 128    vs->id = brw->program_id++;
 129    vs->has_flow_control = has_flow_control(&vs->info);
 130
 131    vs->tokens = tgsi_dup_tokens(shader->tokens);
 132    if (vs->tokens == NULL)
 133       goto fail;
 134
 135    tgsi_scan_shader(vs->tokens, &vs->info);
 136
 137    /* Done:
 138     */
 139    return (void *)vs;
 140
 141 fail:
 142    FREE(vs);
 143    return NULL;
 144 }
 145
 146
 147 static void brw_delete_fs_state( struct pipe_context *pipe, void *prog )
 148 {
 149    struct brw_fragment_shader *fs = (struct brw_fragment_shader *)prog;
 150
 151    bo_reference(&fs->const_buffer, NULL);
 152    FREE( (void *)fs->tokens );
 153    FREE( fs );
 154 }
 155
 156
 157 static void brw_delete_vs_state( struct pipe_context *pipe, void *prog )
 158 {
 159    struct brw_fragment_shader *vs = (struct brw_fragment_shader *)prog;
 160
 161    /* Delete draw shader
 162     */
 163    FREE( (void *)vs->tokens );
 164    FREE( vs );
 165 }
 166
 167
 168 static void brw_set_constant_buffer(struct pipe_context *pipe,
 169                                      uint shader, uint index,
 170                                      const struct pipe_constant_buffer *buf)
 171 {
 172    struct brw_context *brw = brw_context(pipe);
 173
 174    assert(index == 0);
 175
 176    if (shader == PIPE_SHADER_FRAGMENT) {
 177       pipe_buffer_reference( &brw->curr.fragment_constants,
 178                              buf->buffer );
 179
 180       brw->state.dirty.mesa |= PIPE_NEW_FRAGMENT_CONSTANTS;
 181    }
 182    else {
 183       pipe_buffer_reference( &brw->curr.vertex_constants,
 184                              buf->buffer );
 185
 186       brw->state.dirty.mesa |= PIPE_NEW_VERTEX_CONSTANTS;
 187    }
 188 }
 189
 190
 191 void brw_pipe_shader_init( struct brw_context *brw )
 192 {
 193    brw->base.set_constant_buffer = brw_set_constant_buffer;
 194
 195    brw->base.create_vs_state = brw_create_vs_state;
 196    brw->base.bind_vs_state = brw_bind_vs_state;
 197    brw->base.delete_vs_state = brw_delete_vs_state;
 198
 199    brw->base.create_fs_state = brw_create_fs_state;
 200    brw->base.bind_fs_state = brw_bind_fs_state;
 201    brw->base.delete_fs_state = brw_delete_fs_state;
 202 }
 203
 204 void brw_pipe_shader_cleanup( struct brw_context *brw )
 205 {
 206    pipe_buffer_reference( &brw->curr.fragment_constants, NULL );
 207    pipe_buffer_reference( &brw->curr.vertex_constants, NULL );
 208 }