src/mesa/tnl/t_pipeline.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.3
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.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( GLcontext *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( GLcontext *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( GLcontext *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( GLcontext *ctx )
  93 {
  94 #if 0
  95    TNLcontext *tnl = TNL_CONTEXT(ctx);
  96
  97    for (i = 0; i < VERT_RESULT_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( GLcontext *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    START_FAST_MATH(__tmp);
 150
 151    for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
 152       struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
 153       if (!s->run( ctx, s ))
 154          break;
 155    }
 156
 157    END_FAST_MATH(__tmp);
 158 }
 159
 160
 161
 162 /* The default pipeline.  This is useful for software rasterizers, and
 163  * simple hardware rasterizers.  For customization, I don't recommend
 164  * tampering with the internals of these stages in the way that
 165  * drivers did in Mesa 3.4.  These stages are basically black boxes,
 166  * and should be left intact.
 167  *
 168  * To customize the pipeline, consider:
 169  *
 170  * - removing redundant stages (making sure that the software rasterizer
 171  *   can cope with this on fallback paths).  An example is fog
 172  *   coordinate generation, which is not required in the FX driver.
 173  *
 174  * - replacing general-purpose machine-independent stages with
 175  *   general-purpose machine-specific stages.  There is no example of
 176  *   this to date, though it must be borne in mind that all subsequent
 177  *   stages that reference the output of the new stage must cope with
 178  *   any machine-specific data introduced.  This may not be easy
 179  *   unless there are no such stages (ie the new stage is the last in
 180  *   the pipe).
 181  *
 182  * - inserting optimized (but specialized) stages ahead of the
 183  *   general-purpose fallback implementation.  For example, the old
 184  *   fastpath mechanism, which only works when the VB->Elts input is
 185  *   available, can be duplicated by placing the fastpath stage at the
 186  *   head of this pipeline.  Such specialized stages are currently
 187  *   constrained to have no outputs (ie. they must either finish the *
 188  *   pipeline by returning GL_FALSE from run(), or do nothing).
 189  *
 190  * Some work can be done to lift some of the restrictions in the final
 191  * case, if it becomes necessary to do so.
 192  */
 193 const struct tnl_pipeline_stage *_tnl_default_pipeline[] = {
 194    &_tnl_vertex_transform_stage,
 195    &_tnl_normal_transform_stage,
 196    &_tnl_lighting_stage,
 197    &_tnl_texgen_stage,
 198    &_tnl_texture_transform_stage,
 199    &_tnl_point_attenuation_stage,
 200    &_tnl_vertex_program_stage,
 201    &_tnl_fog_coordinate_stage,
 202    &_tnl_render_stage,
 203    NULL
 204 };
 205
 206 const struct tnl_pipeline_stage *_tnl_vp_pipeline[] = {
 207    &_tnl_vertex_program_stage,
 208    &_tnl_render_stage,
 209    NULL
 210 };