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    if (tnl->pipeline.input_changes &&
  89       tnl->Driver.NotifyInputChanges)
  90       tnl->Driver.NotifyInputChanges( ctx, tnl->pipeline.input_changes );
  91
  92    return tnl->pipeline.input_changes;
  93 }
  94
  95
  96 static GLuint check_output_changes( GLcontext *ctx )
  97 {
  98 #if 0
  99    TNLcontext *tnl = TNL_CONTEXT(ctx);
 100
 101    for (i = 0; i < VERT_RESULT_MAX; i++) {
 102       if (tnl->vb.ResultPtr[i]->size != tnl->last_result_size[i] ||
 103           tnl->vb.ResultPtr[i]->stride != tnl->last_result_stride[i]) {
 104          tnl->last_result_size[i] = tnl->vb.ResultPtr[i]->size;
 105          tnl->last_result_stride[i] = tnl->vb.ResultPtr[i]->stride;
 106          tnl->pipeline.output_changes |= 1<<i;
 107       }
 108    }
 109
 110    if (tnl->pipeline.output_changes)
 111       tnl->Driver.NotifyOutputChanges( ctx, tnl->pipeline.output_changes );
 112
 113    return tnl->pipeline.output_changes;
 114 #else
 115    return ~0;
 116 #endif
 117 }
 118
 119
 120 void _tnl_run_pipeline( GLcontext *ctx )
 121 {
 122    TNLcontext *tnl = TNL_CONTEXT(ctx);
 123    unsigned short __tmp;
 124    GLuint i;
 125
 126    if (!tnl->vb.Count)
 127       return;
 128
 129    /* Check for changed input sizes or change in stride to/from zero
 130     * (ie const or non-const).
 131     */
 132    if (check_input_changes( ctx ) || tnl->pipeline.new_state) {
 133       if (ctx->VertexProgram._MaintainTnlProgram)
 134          _tnl_UpdateFixedFunctionProgram( ctx );
 135
 136       for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
 137          struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
 138          if (s->validate)
 139             s->validate( ctx, s );
 140       }
 141
 142       tnl->pipeline.new_state = 0;
 143       tnl->pipeline.input_changes = 0;
 144
 145       /* Pipeline can only change its output in response to either a
 146        * statechange or an input size/stride change.  No other changes
 147        * are allowed.
 148        */
 149       if (check_output_changes( ctx ))
 150          _tnl_notify_pipeline_output_change( ctx );
 151    }
 152
 153    START_FAST_MATH(__tmp);
 154
 155    for (i = 0; i < tnl->pipeline.nr_stages ; i++) {
 156       struct tnl_pipeline_stage *s = &tnl->pipeline.stages[i];
 157       if (!s->run( ctx, s ))
 158          break;
 159    }
 160
 161    END_FAST_MATH(__tmp);
 162 }
 163
 164
 165
 166 /* The default pipeline.  This is useful for software rasterizers, and
 167  * simple hardware rasterizers.  For customization, I don't recommend
 168  * tampering with the internals of these stages in the way that
 169  * drivers did in Mesa 3.4.  These stages are basically black boxes,
 170  * and should be left intact.
 171  *
 172  * To customize the pipeline, consider:
 173  *
 174  * - removing redundant stages (making sure that the software rasterizer
 175  *   can cope with this on fallback paths).  An example is fog
 176  *   coordinate generation, which is not required in the FX driver.
 177  *
 178  * - replacing general-purpose machine-independent stages with
 179  *   general-purpose machine-specific stages.  There is no example of
 180  *   this to date, though it must be borne in mind that all subsequent
 181  *   stages that reference the output of the new stage must cope with
 182  *   any machine-specific data introduced.  This may not be easy
 183  *   unless there are no such stages (ie the new stage is the last in
 184  *   the pipe).
 185  *
 186  * - inserting optimized (but specialized) stages ahead of the
 187  *   general-purpose fallback implementation.  For example, the old
 188  *   fastpath mechanism, which only works when the VB->Elts input is
 189  *   available, can be duplicated by placing the fastpath stage at the
 190  *   head of this pipeline.  Such specialized stages are currently
 191  *   constrained to have no outputs (ie. they must either finish the *
 192  *   pipeline by returning GL_FALSE from run(), or do nothing).
 193  *
 194  * Some work can be done to lift some of the restrictions in the final
 195  * case, if it becomes necessary to do so.
 196  */
 197 const struct tnl_pipeline_stage *_tnl_default_pipeline[] = {
 198    &_tnl_vertex_transform_stage,
 199    &_tnl_normal_transform_stage,
 200    &_tnl_lighting_stage,
 201    &_tnl_texgen_stage,
 202    &_tnl_texture_transform_stage,
 203    &_tnl_point_attenuation_stage,
 204    &_tnl_vertex_program_stage,
 205    &_tnl_fog_coordinate_stage,
 206    &_tnl_render_stage,
 207    NULL
 208 };
 209
 210 const struct tnl_pipeline_stage *_tnl_vp_pipeline[] = {
 211    &_tnl_vertex_program_stage,
 212    &_tnl_render_stage,
 213    NULL
 214 };