src/mesa/tnl/t_pipeline.c

   1 /* $Id: t_pipeline.c,v 1.26 2003/03/01 01:50:27 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.1
   6  *
   7  * Copyright (C) 1999-2003  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell <keith@tungstengraphics.com>
  28  */
  29
  30 #include "glheader.h"
  31 #include "context.h"
  32 #include "imports.h"
  33 #include "state.h"
  34 #include "mtypes.h"
  35
  36 #include "math/m_translate.h"
  37 #include "math/m_xform.h"
  38
  39 #include "t_context.h"
  40 #include "t_pipeline.h"
  41
  42
  43 void _tnl_install_pipeline( GLcontext *ctx,
  44                             const struct gl_pipeline_stage **stages )
  45 {
  46    TNLcontext *tnl = TNL_CONTEXT(ctx);
  47    struct gl_pipeline *pipe = &tnl->pipeline;
  48    GLuint i;
  49
  50    ASSERT(pipe->nr_stages == 0);
  51
  52    pipe->run_state_changes = ~0;
  53    pipe->run_input_changes = ~0;
  54    pipe->build_state_changes = ~0;
  55    pipe->build_state_trigger = 0;
  56    pipe->inputs = 0;
  57
  58    /* Create a writeable copy of each stage.
  59     */
  60    for (i = 0 ; i < MAX_PIPELINE_STAGES && stages[i] ; i++) {
  61       MEMCPY( &pipe->stages[i], stages[i], sizeof( **stages ));
  62       pipe->build_state_trigger |= pipe->stages[i].check_state;
  63    }
  64
  65    MEMSET( &pipe->stages[i], 0, sizeof( **stages ));
  66
  67    pipe->nr_stages = i;
  68 }
  69
  70 void _tnl_destroy_pipeline( GLcontext *ctx )
  71 {
  72    TNLcontext *tnl = TNL_CONTEXT(ctx);
  73    GLuint i;
  74
  75    for (i = 0 ; i < tnl->pipeline.nr_stages ; i++)
  76       tnl->pipeline.stages[i].destroy( &tnl->pipeline.stages[i] );
  77
  78    tnl->pipeline.nr_stages = 0;
  79 }
  80
  81 /* TODO: merge validate with run.
  82  */
  83 void _tnl_validate_pipeline( GLcontext *ctx )
  84 {
  85    TNLcontext *tnl = TNL_CONTEXT(ctx);
  86    struct gl_pipeline *pipe = &tnl->pipeline;
  87    struct gl_pipeline_stage *s = pipe->stages;
  88    GLuint newstate = pipe->build_state_changes;
  89    GLuint generated = 0;
  90    GLuint changed_inputs = 0;
  91
  92    pipe->inputs = 0;
  93    pipe->build_state_changes = 0;
  94
  95    for ( ; s->check ; s++) {
  96
  97       s->changed_inputs |= s->inputs & changed_inputs;
  98
  99       if (s->check_state & newstate) {
 100          if (s->active) {
 101             GLuint old_outputs = s->outputs;
 102             s->check(ctx, s);
 103             if (!s->active)
 104                changed_inputs |= old_outputs;
 105          }
 106          else
 107             s->check(ctx, s);
 108       }
 109
 110       if (s->active) {
 111          pipe->inputs |= s->inputs & ~generated;
 112          generated |= s->outputs;
 113       }
 114    }
 115 }
 116
 117
 118
 119 void _tnl_run_pipeline( GLcontext *ctx )
 120 {
 121    TNLcontext *tnl = TNL_CONTEXT(ctx);
 122    struct vertex_buffer *VB = &tnl->vb;
 123    struct gl_pipeline *pipe = &tnl->pipeline;
 124    struct gl_pipeline_stage *s = pipe->stages;
 125    GLuint changed_state = pipe->run_state_changes;
 126    GLuint changed_inputs = pipe->run_input_changes;
 127    GLboolean running = GL_TRUE;
 128    unsigned short __tmp;
 129
 130    pipe->run_state_changes = 0;
 131    pipe->run_input_changes = 0;
 132
 133    /* Done elsewhere.
 134     */
 135    ASSERT(pipe->build_state_changes == 0);
 136
 137    START_FAST_MATH(__tmp);
 138
 139    /* If something changes in the pipeline, tag all subsequent stages
 140     * using this value for recalculation.  Inactive stages have their
 141     * state and inputs examined to try to keep cached data alive over
 142     * state-changes.
 143     */
 144    for ( ; s->run ; s++) {
 145       s->changed_inputs |= s->inputs & changed_inputs;
 146
 147       if (s->run_state & changed_state)
 148          s->changed_inputs = s->inputs;
 149
 150       if (s->active && running) {
 151          if (s->changed_inputs)
 152             changed_inputs |= s->outputs;
 153
 154          running = s->run( ctx, s );
 155
 156          s->changed_inputs = 0;
 157          VB->importable_data &= ~s->outputs;
 158       }
 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 VERT_BIT_ELT 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 gl_pipeline_stage *_tnl_default_pipeline[] = {
 198    &_tnl_vertex_transform_stage,
 199    &_tnl_normal_transform_stage,
 200    &_tnl_lighting_stage,
 201    &_tnl_fog_coordinate_stage,
 202    &_tnl_texgen_stage,
 203    &_tnl_texture_transform_stage,
 204    &_tnl_point_attenuation_stage,
 205 #if FEATURE_NV_vertex_program
 206    &_tnl_vertex_program_stage,
 207 #endif
 208    &_tnl_render_stage,
 209    0
 210 };