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 GLboolean brw_wm_has_flow_control(const struct brw_fragment_shader *fp)
  47 {
  48     return (fp->info.opcode_count[TGSI_OPCODE_ARL] > 0 ||
  49             fp->info.opcode_count[TGSI_OPCODE_IF] > 0 ||
  50             fp->info.opcode_count[TGSI_OPCODE_ENDIF] > 0 || /* redundant - IF */
  51             fp->info.opcode_count[TGSI_OPCODE_CAL] > 0 ||
  52             fp->info.opcode_count[TGSI_OPCODE_BRK] > 0 ||   /* redundant - BGNLOOP */
  53             fp->info.opcode_count[TGSI_OPCODE_RET] > 0 ||   /* redundant - CAL */
  54             fp->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 = brw_wm_has_flow_control(fs);
  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 = brw_wm_has_flow_control(vs);
 130
 131    /* Tell the draw module about this shader:
 132     */
 133
 134    /* Done:
 135     */
 136    return (void *)vs;
 137 }
 138
 139
 140 static void brw_delete_fs_state( struct pipe_context *pipe, void *prog )
 141 {
 142    struct brw_context *brw = brw_context(pipe);
 143    struct brw_fragment_shader *fs = (struct brw_fragment_shader *)prog;
 144
 145    brw->sws->bo_unreference(fs->const_buffer);
 146    FREE( (void *)fs->tokens );
 147    FREE( fs );
 148 }
 149
 150
 151 static void brw_delete_vs_state( struct pipe_context *pipe, void *prog )
 152 {
 153    struct brw_fragment_shader *vs = (struct brw_fragment_shader *)prog;
 154
 155    /* Delete draw shader
 156     */
 157    FREE( (void *)vs->tokens );
 158    FREE( vs );
 159 }
 160
 161
 162 static void brw_set_constant_buffer(struct pipe_context *pipe,
 163                                      uint shader, uint index,
 164                                      const struct pipe_constant_buffer *buf)
 165 {
 166    struct brw_context *brw = brw_context(pipe);
 167
 168    assert(index == 0);
 169
 170    if (shader == PIPE_SHADER_FRAGMENT) {
 171       pipe_buffer_reference( &brw->curr.fragment_constants,
 172                              buf->buffer );
 173
 174       brw->state.dirty.mesa |= PIPE_NEW_FRAGMENT_CONSTANTS;
 175    }
 176    else {
 177       pipe_buffer_reference( &brw->curr.vertex_constants,
 178                              buf->buffer );
 179
 180       brw->state.dirty.mesa |= PIPE_NEW_VERTEX_CONSTANTS;
 181    }
 182 }
 183
 184
 185 void brw_pipe_shader_init( struct brw_context *brw )
 186 {
 187    brw->base.set_constant_buffer = brw_set_constant_buffer;
 188
 189    brw->base.create_vs_state = brw_create_vs_state;
 190    brw->base.bind_vs_state = brw_bind_vs_state;
 191    brw->base.delete_vs_state = brw_delete_vs_state;
 192
 193    brw->base.create_fs_state = brw_create_fs_state;
 194    brw->base.bind_fs_state = brw_bind_fs_state;
 195    brw->base.delete_fs_state = brw_delete_fs_state;
 196 }
 197
 198 void brw_pipe_shader_cleanup( struct brw_context *brw )
 199 {
 200    pipe_buffer_reference( &brw->curr.fragment_constants, NULL );
 201    pipe_buffer_reference( &brw->curr.vertex_constants, NULL );
 202 }