src/mesa/tnl/t_pipeline.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2007  Brian Paul   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 "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keithw@vmware.com>
  26  */
  27
  28 #include "main/glheader.h"
  29 #include "main/context.h"
  30 #include "main/imports.h"
  31 #include "main/mtypes.h"
  32
  33 #include "t_context.h"
  34 #include "t_pipeline.h"
  35 #include "t_vp_build.h"
  36 #include "t_vertex.h"
  37
  38 void _tnl_install_pipeline( struct gl_context *ctx,
  39                             const struct tnl_pipeline_stage **stages )
  40 {
  41    TNLcontext *tnl = TNL_CONTEXT(ctx);
  42    GLuint i;
  43
  44    tnl->pipeline.new_state = ~0;
  45
  46    /* Create a writeable copy of each stage.
  47     */
  48    for (i = 0 ; i < MAX_PIPELINE_STAGES && stages[i] ; i++) {
  49       struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
  50       memcpy(s, stages[i], sizeof(*s));
  51       if (s->create)
  52          s->create(ctx, s);
  53    }
  54
  55    tnl->pipeline.nr_stages = i;
  56 }
  57
  58 void _tnl_destroy_pipeline( struct gl_context *ctx )
  59 {
  60    TNLcontext *tnl = TNL_CONTEXT(ctx);
  61    GLuint i;
  62
  63    for (i = 0 ; i < tnl->pipeline.nr_stages ; i++) {
  64       struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
  65       if (s->destroy)
  66          s->destroy(s);
  67    }
  68
  69    tnl->pipeline.nr_stages = 0;
  70 }
  71
  72
  73
  74 static GLuint check_input_changes( struct gl_context *ctx )
  75 {
  76    TNLcontext *tnl = TNL_CONTEXT(ctx);
  77    GLuint i;
  78
  79    for (i = 0; i <= _TNL_LAST_MAT; i++) {
  80       if (tnl->vb.AttribPtr[i]->size != tnl->pipeline.last_attrib_size[i] ||
  81           tnl->vb.AttribPtr[i]->stride != tnl->pipeline.last_attrib_stride[i]) {
  82          tnl->pipeline.last_attrib_size[i] = tnl->vb.AttribPtr[i]->size;
  83          tnl->pipeline.last_attrib_stride[i] = tnl->vb.AttribPtr[i]->stride;
  84          tnl->pipeline.input_changes |= 1<<i;
  85       }
  86    }
  87
  88    return tnl->pipeline.input_changes;
  89 }
  90
  91
  92 static GLuint check_output_changes( struct gl_context *ctx )
  93 {
  94 #if 0
  95    TNLcontext *tnl = TNL_CONTEXT(ctx);
  96
  97    for (i = 0; i < VARYING_SLOT_MAX; i++) {
  98       if (tnl->vb.ResultPtr[i]->size != tnl->last_result_size[i] ||
  99           tnl->vb.ResultPtr[i]->stride != tnl->last_result_stride[i]) {
 100          tnl->last_result_size[i] = tnl->vb.ResultPtr[i]->size;
 101          tnl->last_result_stride[i] = tnl->vb.ResultPtr[i]->stride;
 102          tnl->pipeline.output_changes |= 1<<i;
 103       }
 104    }
 105
 106    if (tnl->pipeline.output_changes)
 107       tnl->Driver.NotifyOutputChanges( ctx, tnl->pipeline.output_changes );
 108
 109    return tnl->pipeline.output_changes;
 110 #else
 111    return ~0;
 112 #endif
 113 }
 114
 115
 116 void _tnl_run_pipeline( struct gl_context *ctx )
 117 {
 118    TNLcontext *tnl = TNL_CONTEXT(ctx);
 119    unsigned short __tmp;
 120    GLuint i;
 121
 122    if (!tnl->vb.Count)
 123       return;
 124
 125    /* Check for changed input sizes or change in stride to/from zero
 126     * (ie const or non-const).
 127     */
 128    if (check_input_changes( ctx ) || tnl->pipeline.new_state) {
 129       if (ctx->VertexProgram._MaintainTnlProgram)
 130          _tnl_UpdateFixedFunctionProgram( ctx );
 131
 132       for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
 133          struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
 134          if (s->validate)
 135             s->validate( ctx, s );
 136       }
 137
 138       tnl->pipeline.new_state = 0;
 139       tnl->pipeline.input_changes = 0;
 140
 141       /* Pipeline can only change its output in response to either a
 142        * statechange or an input size/stride change.  No other changes
 143        * are allowed.
 144        */
 145       if (check_output_changes( ctx ))
 146          _tnl_notify_pipeline_output_change( ctx );
 147    }
 148
 149 #ifndef _OPENMP
 150    /* Don't adjust FPU precision mode in case multiple threads are to be used.
 151     * This would require that the additional threads also changed the FPU mode
 152     * which is quite a mess as this had to be done in all parallelized sections;
 153     * otherwise the master thread and all other threads are running in different
 154     * modes, producing inconsistent results.
 155     * Note that all x64 implementations don't define/use START_FAST_MATH, so
 156     * this is "hack" is only used in i386 mode
 157     */
 158    START_FAST_MATH(__tmp);
 159 #endif
 160
 161    for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
 162       struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
 163       if (!s->run( ctx, s ))
 164          break;
 165    }
 166
 167 #ifndef _OPENMP
 168    END_FAST_MATH(__tmp);
 169 #endif
 170 }
 171
 172
 173
 174 /* The default pipeline.  This is useful for software rasterizers, and
 175  * simple hardware rasterizers.  For customization, I don't recommend
 176  * tampering with the internals of these stages in the way that
 177  * drivers did in Mesa 3.4.  These stages are basically black boxes,
 178  * and should be left intact.
 179  *
 180  * To customize the pipeline, consider:
 181  *
 182  * - removing redundant stages (making sure that the software rasterizer
 183  *   can cope with this on fallback paths).  An example is fog
 184  *   coordinate generation, which is not required in the FX driver.
 185  *
 186  * - replacing general-purpose machine-independent stages with
 187  *   general-purpose machine-specific stages.  There is no example of
 188  *   this to date, though it must be borne in mind that all subsequent
 189  *   stages that reference the output of the new stage must cope with
 190  *   any machine-specific data introduced.  This may not be easy
 191  *   unless there are no such stages (ie the new stage is the last in
 192  *   the pipe).
 193  *
 194  * - inserting optimized (but specialized) stages ahead of the
 195  *   general-purpose fallback implementation.  For example, the old
 196  *   fastpath mechanism, which only works when the VB->Elts input is
 197  *   available, can be duplicated by placing the fastpath stage at the
 198  *   head of this pipeline.  Such specialized stages are currently
 199  *   constrained to have no outputs (ie. they must either finish the *
 200  *   pipeline by returning GL_FALSE from run(), or do nothing).
 201  *
 202  * Some work can be done to lift some of the restrictions in the final
 203  * case, if it becomes necessary to do so.
 204  */
 205 const struct tnl_pipeline_stage *_tnl_default_pipeline[] = {
 206    &_tnl_vertex_transform_stage,
 207    &_tnl_normal_transform_stage,
 208    &_tnl_lighting_stage,
 209    &_tnl_texgen_stage,
 210    &_tnl_texture_transform_stage,
 211    &_tnl_point_attenuation_stage,
 212    &_tnl_vertex_program_stage,
 213    &_tnl_fog_coordinate_stage,
 214    &_tnl_render_stage,
 215    NULL
 216 };
 217
 218 const struct tnl_pipeline_stage *_tnl_vp_pipeline[] = {
 219    &_tnl_vertex_program_stage,
 220    &_tnl_render_stage,
 221    NULL
 222 };