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    fs->signature.nr_inputs = fs->info.num_inputs;
 100    for (i = 0; i < fs->info.num_inputs; i++) {
 101       fs->signature.input[i].semantic = fs->info.input_semantic_name[i];
 102       fs->signature.input[i].semantic_index = fs->info.input_semantic_index[i];
 103    }
 104
 105    for (i = 0; i < fs->info.num_inputs; i++)
 106       if (fs->info.input_semantic_name[i] == TGSI_SEMANTIC_POSITION)
 107          fs->uses_depth = 1;
 108
 109    if (fs->info.uses_kill)
 110       fs->iz_lookup |= IZ_PS_KILL_ALPHATEST_BIT;
 111
 112    if (fs->info.writes_z)
 113       fs->iz_lookup |= IZ_PS_COMPUTES_DEPTH_BIT;
 114
 115    return (void *)fs;
 116
 117 fail:
 118    FREE(fs);
 119    return NULL;
 120 }
 121
 122
 123 static void *brw_create_vs_state( struct pipe_context *pipe,
 124                                   const struct pipe_shader_state *shader )
 125 {
 126    struct brw_context *brw = brw_context(pipe);
 127
 128    struct brw_vertex_shader *vs = CALLOC_STRUCT(brw_vertex_shader);
 129    if (vs == NULL)
 130       return NULL;
 131
 132    /* Duplicate tokens, scan shader
 133     */
 134    vs->id = brw->program_id++;
 135    vs->has_flow_control = has_flow_control(&vs->info);
 136
 137    vs->tokens = tgsi_dup_tokens(shader->tokens);
 138    if (vs->tokens == NULL)
 139       goto fail;
 140
 141    tgsi_scan_shader(vs->tokens, &vs->info);
 142
 143    /* Done:
 144     */
 145    return (void *)vs;
 146
 147 fail:
 148    FREE(vs);
 149    return NULL;
 150 }
 151
 152
 153 static void brw_delete_fs_state( struct pipe_context *pipe, void *prog )
 154 {
 155    struct brw_fragment_shader *fs = (struct brw_fragment_shader *)prog;
 156
 157    bo_reference(&fs->const_buffer, NULL);
 158    FREE( (void *)fs->tokens );
 159    FREE( fs );
 160 }
 161
 162
 163 static void brw_delete_vs_state( struct pipe_context *pipe, void *prog )
 164 {
 165    struct brw_fragment_shader *vs = (struct brw_fragment_shader *)prog;
 166
 167    /* Delete draw shader
 168     */
 169    FREE( (void *)vs->tokens );
 170    FREE( vs );
 171 }
 172
 173
 174 static void brw_set_constant_buffer(struct pipe_context *pipe,
 175                                      uint shader, uint index,
 176                                      const struct pipe_constant_buffer *buf)
 177 {
 178    struct brw_context *brw = brw_context(pipe);
 179
 180    assert(index == 0);
 181
 182    if (shader == PIPE_SHADER_FRAGMENT) {
 183       pipe_buffer_reference( &brw->curr.fragment_constants,
 184                              buf->buffer );
 185
 186       brw->state.dirty.mesa |= PIPE_NEW_FRAGMENT_CONSTANTS;
 187    }
 188    else {
 189       pipe_buffer_reference( &brw->curr.vertex_constants,
 190                              buf->buffer );
 191
 192       brw->state.dirty.mesa |= PIPE_NEW_VERTEX_CONSTANTS;
 193    }
 194 }
 195
 196
 197 void brw_pipe_shader_init( struct brw_context *brw )
 198 {
 199    brw->base.set_constant_buffer = brw_set_constant_buffer;
 200
 201    brw->base.create_vs_state = brw_create_vs_state;
 202    brw->base.bind_vs_state = brw_bind_vs_state;
 203    brw->base.delete_vs_state = brw_delete_vs_state;
 204
 205    brw->base.create_fs_state = brw_create_fs_state;
 206    brw->base.bind_fs_state = brw_bind_fs_state;
 207    brw->base.delete_fs_state = brw_delete_fs_state;
 208 }
 209
 210 void brw_pipe_shader_cleanup( struct brw_context *brw )
 211 {
 212    pipe_buffer_reference( &brw->curr.fragment_constants, NULL );
 213    pipe_buffer_reference( &brw->curr.vertex_constants, NULL );
 214 }