src/mesa/tnl/t_pipeline.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  6.5
   5  *
   6  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *    Keith Whitwell <keith@tungstengraphics.com>
  27  */
  28
  29 #include "glheader.h"
  30 #include "context.h"
  31 #include "imports.h"
  32 #include "state.h"
  33 #include "mtypes.h"
  34
  35 #include "t_context.h"
  36 #include "t_pipeline.h"
  37 #include "t_vp_build.h"
  38 #include "t_vertex.h"
  39
  40 void _tnl_install_pipeline( GLcontext *ctx,
  41                             const struct tnl_pipeline_stage **stages )
  42 {
  43    TNLcontext *tnl = TNL_CONTEXT(ctx);
  44    GLuint i;
  45
  46    tnl->pipeline.new_state = ~0;
  47
  48    /* Create a writeable copy of each stage.
  49     */
  50    for (i = 0 ; i < MAX_PIPELINE_STAGES && stages[i] ; i++) {
  51       struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
  52       MEMCPY(s, stages[i], sizeof(*s));
  53       if (s->create)
  54          s->create(ctx, s);
  55    }
  56
  57    tnl->pipeline.nr_stages = i;
  58 }
  59
  60 void _tnl_destroy_pipeline( GLcontext *ctx )
  61 {
  62    TNLcontext *tnl = TNL_CONTEXT(ctx);
  63    GLuint i;
  64
  65    for (i = 0 ; i < tnl->pipeline.nr_stages ; i++) {
  66       struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
  67       if (s->destroy)
  68          s->destroy(s);
  69    }
  70
  71    tnl->pipeline.nr_stages = 0;
  72 }
  73
  74
  75
  76 static GLuint check_input_changes( GLcontext *ctx )
  77 {
  78    TNLcontext *tnl = TNL_CONTEXT(ctx);
  79    GLuint i;
  80
  81    for (i = 0; i <= _TNL_LAST_MAT; i++) {
  82       if (tnl->vb.AttribPtr[i]->size != tnl->pipeline.last_attrib_size[i] ||
  83           tnl->vb.AttribPtr[i]->stride != tnl->pipeline.last_attrib_stride[i]) {
  84          tnl->pipeline.last_attrib_size[i] = tnl->vb.AttribPtr[i]->size;
  85          tnl->pipeline.last_attrib_stride[i] = tnl->vb.AttribPtr[i]->stride;
  86          tnl->pipeline.input_changes |= 1<<i;
  87       }
  88    }
  89
  90    if (tnl->pipeline.input_changes &&
  91       tnl->Driver.NotifyInputChanges)
  92       tnl->Driver.NotifyInputChanges( ctx, tnl->pipeline.input_changes );
  93
  94    return tnl->pipeline.input_changes;
  95 }
  96
  97
  98 static GLuint check_output_changes( GLcontext *ctx )
  99 {
 100 #if 0
 101    TNLcontext *tnl = TNL_CONTEXT(ctx);
 102
 103    for (i = 0; i < VERT_RESULT_MAX; i++) {
 104       if (tnl->vb.ResultPtr[i]->size != tnl->last_result_size[i] ||
 105           tnl->vb.ResultPtr[i]->stride != tnl->last_result_stride[i]) {
 106          tnl->last_result_size[i] = tnl->vb.ResultPtr[i]->size;
 107          tnl->last_result_stride[i] = tnl->vb.ResultPtr[i]->stride;
 108          tnl->pipeline.output_changes |= 1<<i;
 109       }
 110    }
 111
 112    if (tnl->pipeline.output_changes)
 113       tnl->Driver.NotifyOutputChanges( ctx, tnl->pipeline.output_changes );
 114
 115    return tnl->pipeline.output_changes;
 116 #else
 117    return ~0;
 118 #endif
 119 }
 120
 121
 122 void _tnl_run_pipeline( GLcontext *ctx )
 123 {
 124    TNLcontext *tnl = TNL_CONTEXT(ctx);
 125    unsigned short __tmp;
 126    GLuint i;
 127
 128    if (!tnl->vb.Count)
 129       return;
 130
 131    /* Check for changed input sizes or change in stride to/from zero
 132     * (ie const or non-const).
 133     */
 134    if (check_input_changes( ctx ) || tnl->pipeline.new_state) {
 135       if (ctx->VertexProgram._MaintainTnlProgram)
 136          _tnl_UpdateFixedFunctionProgram( ctx );
 137
 138       for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
 139          struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
 140          if (s->validate)
 141             s->validate( ctx, s );
 142       }
 143
 144       tnl->pipeline.new_state = 0;
 145       tnl->pipeline.input_changes = 0;
 146
 147       /* Pipeline can only change its output in response to either a
 148        * statechange or an input size/stride change.  No other changes
 149        * are allowed.
 150        */
 151       if (check_output_changes( ctx ))
 152          _tnl_notify_pipeline_output_change( ctx );
 153    }
 154
 155    START_FAST_MATH(__tmp);
 156
 157    for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
 158       struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
 159       if (!s->run( ctx, s ))
 160          break;
 161    }
 162
 163    END_FAST_MATH(__tmp);
 164 }
 165
 166
 167
 168 /* The default pipeline.  This is useful for software rasterizers, and
 169  * simple hardware rasterizers.  For customization, I don't recommend
 170  * tampering with the internals of these stages in the way that
 171  * drivers did in Mesa 3.4.  These stages are basically black boxes,
 172  * and should be left intact.
 173  *
 174  * To customize the pipeline, consider:
 175  *
 176  * - removing redundant stages (making sure that the software rasterizer
 177  *   can cope with this on fallback paths).  An example is fog
 178  *   coordinate generation, which is not required in the FX driver.
 179  *
 180  * - replacing general-purpose machine-independent stages with
 181  *   general-purpose machine-specific stages.  There is no example of
 182  *   this to date, though it must be borne in mind that all subsequent
 183  *   stages that reference the output of the new stage must cope with
 184  *   any machine-specific data introduced.  This may not be easy
 185  *   unless there are no such stages (ie the new stage is the last in
 186  *   the pipe).
 187  *
 188  * - inserting optimized (but specialized) stages ahead of the
 189  *   general-purpose fallback implementation.  For example, the old
 190  *   fastpath mechanism, which only works when the VB->Elts input is
 191  *   available, can be duplicated by placing the fastpath stage at the
 192  *   head of this pipeline.  Such specialized stages are currently
 193  *   constrained to have no outputs (ie. they must either finish the *
 194  *   pipeline by returning GL_FALSE from run(), or do nothing).
 195  *
 196  * Some work can be done to lift some of the restrictions in the final
 197  * case, if it becomes necessary to do so.
 198  */
 199 const struct tnl_pipeline_stage *_tnl_default_pipeline[] = {
 200    &_tnl_vertex_transform_stage,
 201    &_tnl_normal_transform_stage,
 202    &_tnl_lighting_stage,
 203    &_tnl_fog_coordinate_stage,
 204    &_tnl_texgen_stage,
 205    &_tnl_texture_transform_stage,
 206    &_tnl_point_attenuation_stage,
 207 #if defined(FEATURE_NV_vertex_program) || defined(FEATURE_ARB_vertex_program)
 208    &_tnl_arb_vertex_program_stage,
 209    &_tnl_vertex_program_stage,
 210 #endif
 211    &_tnl_render_stage,
 212    NULL
 213 };
 214
 215 const struct tnl_pipeline_stage *_tnl_vp_pipeline[] = {
 216    &_tnl_arb_vertex_program_stage,
 217    &_tnl_render_stage,
 218    NULL
 219 };