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     * Avoid rebinding when possible.
  67     */
  68    if (evs->machine->Tokens != shader->state.tokens) {
  69       tgsi_exec_machine_bind_shader(evs->machine,
  70                                     shader->state.tokens,
  71                                     draw->vs.num_samplers,
  72                                     draw->vs.samplers);
  73    }
  74 }
  75
  76
  77
  78
  79 /* Simplified vertex shader interface for the pt paths.  Given the
  80  * complexity of code-generating all the above operations together,
  81  * it's time to try doing all the other stuff separately.
  82  */
  83 static void
  84 vs_exec_run_linear( struct draw_vertex_shader *shader,
  85                     const float (*input)[4],
  86                     float (*output)[4],
  87                     const float (*constants)[4],
  88                     unsigned count,
  89                     unsigned input_stride,
  90                     unsigned output_stride )
  91 {
  92    struct exec_vertex_shader *evs = exec_vertex_shader(shader);
  93    struct tgsi_exec_machine *machine = evs->machine;
  94    unsigned int i, j;
  95    unsigned slot;
  96
  97    machine->Consts = constants;
  98
  99    for (i = 0; i < count; i += MAX_TGSI_VERTICES) {
 100       unsigned int max_vertices = MIN2(MAX_TGSI_VERTICES, count - i);
 101
 102       /* Swizzle inputs.
 103        */
 104       for (j = 0; j < max_vertices; j++) {
 105 #if 0
 106          debug_printf("%d) Input vert:\n", i + j);
 107          for (slot = 0; slot < shader->info.num_inputs; slot++) {
 108             debug_printf("\t%d: %f %f %f %f\n", slot,
 109                          input[slot][0],
 110                          input[slot][1],
 111                          input[slot][2],
 112                          input[slot][3]);
 113          }
 114 #endif
 115
 116          for (slot = 0; slot < shader->info.num_inputs; slot++) {
 117             machine->Inputs[slot].xyzw[0].f[j] = input[slot][0];
 118             machine->Inputs[slot].xyzw[1].f[j] = input[slot][1];
 119             machine->Inputs[slot].xyzw[2].f[j] = input[slot][2];
 120             machine->Inputs[slot].xyzw[3].f[j] = input[slot][3];
 121          }
 122
 123          input = (const float (*)[4])((const char *)input + input_stride);
 124       }
 125
 126       tgsi_set_exec_mask(machine,
 127                          1,
 128                          max_vertices > 1,
 129                          max_vertices > 2,
 130                          max_vertices > 3);
 131
 132       /* run interpreter */
 133       tgsi_exec_machine_run( machine );
 134
 135       /* Unswizzle all output results.
 136        */
 137       for (j = 0; j < max_vertices; j++) {
 138          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 139             output[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 140             output[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 141             output[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 142             output[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 143
 144          }
 145
 146 #if 0
 147          debug_printf("%d) Post xform vert:\n", i + j);
 148          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 149             debug_printf("\t%d: %f %f %f %f\n", slot,
 150                          output[slot][0],
 151                          output[slot][1],
 152                          output[slot][2],
 153                          output[slot][3]);
 154          }
 155 #endif
 156
 157          output = (float (*)[4])((char *)output + output_stride);
 158       }
 159
 160    }
 161 }
 162
 163
 164
 165
 166 static void
 167 vs_exec_delete( struct draw_vertex_shader *dvs )
 168 {
 169    FREE((void*) dvs->state.tokens);
 170    FREE( dvs );
 171 }
 172
 173
 174 struct draw_vertex_shader *
 175 draw_create_vs_exec(struct draw_context *draw,
 176                     const struct pipe_shader_state *state)
 177 {
 178    struct exec_vertex_shader *vs = CALLOC_STRUCT( exec_vertex_shader );
 179
 180    if (vs == NULL)
 181       return NULL;
 182
 183    /* we make a private copy of the tokens */
 184    vs->base.state.tokens = tgsi_dup_tokens(state->tokens);
 185    if (!vs->base.state.tokens) {
 186       FREE(vs);
 187       return NULL;
 188    }
 189
 190    tgsi_scan_shader(state->tokens, &vs->base.info);
 191
 192    vs->base.draw = draw;
 193    vs->base.prepare = vs_exec_prepare;
 194    vs->base.run_linear = vs_exec_run_linear;
 195    vs->base.delete = vs_exec_delete;
 196    vs->base.create_varient = draw_vs_varient_generic;
 197    vs->machine = &draw->vs.machine;
 198
 199    return &vs->base;
 200 }