src/gallium/auxiliary/draw/draw_vs_exec.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * 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
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * 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
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   *   Brian Paul
  32   */
  33
  34 #include "util/u_math.h"
  35 #include "util/u_memory.h"
  36 #include "pipe/p_shader_tokens.h"
  37
  38 #include "draw_private.h"
  39 #include "draw_context.h"
  40 #include "draw_vs.h"
  41
  42 #include "tgsi/tgsi_parse.h"
  43 #include "tgsi/tgsi_scan.h"
  44
  45
  46 struct exec_vertex_shader {
  47    struct draw_vertex_shader base;
  48    struct tgsi_exec_machine *machine;
  49 };
  50
  51 static struct exec_vertex_shader *exec_vertex_shader( struct draw_vertex_shader *vs )
  52 {
  53    return (struct exec_vertex_shader *)vs;
  54 }
  55
  56
  57 /* Not required for run_linear.
  58  */
  59 static void
  60 vs_exec_prepare( struct draw_vertex_shader *shader,
  61                  struct draw_context *draw )
  62 {
  63    struct exec_vertex_shader *evs = exec_vertex_shader(shader);
  64
  65    /* specify the vertex program to interpret/execute */
  66    tgsi_exec_machine_bind_shader(evs->machine,
  67                                  shader->state.tokens,
  68                                  PIPE_MAX_SAMPLERS,
  69                                  NULL /*samplers*/ );
  70
  71 }
  72
  73
  74
  75
  76 /* Simplified vertex shader interface for the pt paths.  Given the
  77  * complexity of code-generating all the above operations together,
  78  * it's time to try doing all the other stuff separately.
  79  */
  80 static void
  81 vs_exec_run_linear( struct draw_vertex_shader *shader,
  82                     const float (*input)[4],
  83                     float (*output)[4],
  84                     const float (*constants)[4],
  85                     unsigned count,
  86                     unsigned input_stride,
  87                     unsigned output_stride )
  88 {
  89    struct exec_vertex_shader *evs = exec_vertex_shader(shader);
  90    struct tgsi_exec_machine *machine = evs->machine;
  91    unsigned int i, j;
  92    unsigned slot;
  93
  94    machine->Consts = constants;
  95
  96    for (i = 0; i < count; i += MAX_TGSI_VERTICES) {
  97       unsigned int max_vertices = MIN2(MAX_TGSI_VERTICES, count - i);
  98
  99       /* Swizzle inputs.
 100        */
 101       for (j = 0; j < max_vertices; j++) {
 102 #if 0
 103          debug_printf("%d) Input vert:\n", i + j);
 104          for (slot = 0; slot < shader->info.num_inputs; slot++) {
 105             debug_printf("\t%d: %f %f %f %f\n", slot,
 106                          input[slot][0],
 107                          input[slot][1],
 108                          input[slot][2],
 109                          input[slot][3]);
 110          }
 111 #endif
 112
 113          for (slot = 0; slot < shader->info.num_inputs; slot++) {
 114             machine->Inputs[slot].xyzw[0].f[j] = input[slot][0];
 115             machine->Inputs[slot].xyzw[1].f[j] = input[slot][1];
 116             machine->Inputs[slot].xyzw[2].f[j] = input[slot][2];
 117             machine->Inputs[slot].xyzw[3].f[j] = input[slot][3];
 118          }
 119
 120          input = (const float (*)[4])((const char *)input + input_stride);
 121       }
 122
 123       /* run interpreter */
 124       tgsi_exec_machine_run( machine );
 125
 126       /* Unswizzle all output results.
 127        */
 128       for (j = 0; j < max_vertices; j++) {
 129          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 130             output[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 131             output[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 132             output[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 133             output[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 134
 135          }
 136
 137 #if 0
 138          debug_printf("%d) Post xform vert:\n", i + j);
 139          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 140             debug_printf("\t%d: %f %f %f %f\n", slot,
 141                          output[slot][0],
 142                          output[slot][1],
 143                          output[slot][2],
 144                          output[slot][3]);
 145          }
 146 #endif
 147
 148          output = (float (*)[4])((char *)output + output_stride);
 149       }
 150
 151    }
 152 }
 153
 154
 155
 156
 157 static void
 158 vs_exec_delete( struct draw_vertex_shader *dvs )
 159 {
 160    FREE((void*) dvs->state.tokens);
 161    FREE( dvs );
 162 }
 163
 164
 165 struct draw_vertex_shader *
 166 draw_create_vs_exec(struct draw_context *draw,
 167                     const struct pipe_shader_state *state)
 168 {
 169    struct exec_vertex_shader *vs = CALLOC_STRUCT( exec_vertex_shader );
 170
 171    if (vs == NULL)
 172       return NULL;
 173
 174    /* we make a private copy of the tokens */
 175    vs->base.state.tokens = tgsi_dup_tokens(state->tokens);
 176    if (!vs->base.state.tokens) {
 177       FREE(vs);
 178       return NULL;
 179    }
 180
 181    tgsi_scan_shader(state->tokens, &vs->base.info);
 182
 183    vs->base.draw = draw;
 184    vs->base.prepare = vs_exec_prepare;
 185    vs->base.run_linear = vs_exec_run_linear;
 186    vs->base.delete = vs_exec_delete;
 187    vs->base.create_varient = draw_vs_varient_generic;
 188    vs->machine = &draw->vs.machine;
 189
 190    return &vs->base;
 191 }