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    const struct tgsi_token *machine_tokens;
  50 };
  51
  52 static struct exec_vertex_shader *exec_vertex_shader( struct draw_vertex_shader *vs )
  53 {
  54    return (struct exec_vertex_shader *)vs;
  55 }
  56
  57
  58 /* Not required for run_linear.
  59  */
  60 static void
  61 vs_exec_prepare( struct draw_vertex_shader *shader,
  62                  struct draw_context *draw )
  63 {
  64    struct exec_vertex_shader *evs = exec_vertex_shader(shader);
  65
  66    /* Specify the vertex program to interpret/execute.
  67     * Avoid rebinding when possible.
  68     */
  69    if (evs->machine_tokens != shader->state.tokens) {
  70       tgsi_exec_machine_bind_shader(evs->machine,
  71                                     shader->state.tokens,
  72                                     PIPE_MAX_SAMPLERS,
  73                                     NULL /*samplers*/ );
  74       evs->machine_tokens = shader->state.tokens;
  75    }
  76 }
  77
  78
  79
  80
  81 /* Simplified vertex shader interface for the pt paths.  Given the
  82  * complexity of code-generating all the above operations together,
  83  * it's time to try doing all the other stuff separately.
  84  */
  85 static void
  86 vs_exec_run_linear( struct draw_vertex_shader *shader,
  87                     const float (*input)[4],
  88                     float (*output)[4],
  89                     const float (*constants)[4],
  90                     unsigned count,
  91                     unsigned input_stride,
  92                     unsigned output_stride )
  93 {
  94    struct exec_vertex_shader *evs = exec_vertex_shader(shader);
  95    struct tgsi_exec_machine *machine = evs->machine;
  96    unsigned int i, j;
  97    unsigned slot;
  98
  99    machine->Consts = constants;
 100
 101    for (i = 0; i < count; i += MAX_TGSI_VERTICES) {
 102       unsigned int max_vertices = MIN2(MAX_TGSI_VERTICES, count - i);
 103
 104       /* Swizzle inputs.
 105        */
 106       for (j = 0; j < max_vertices; j++) {
 107 #if 0
 108          debug_printf("%d) Input vert:\n", i + j);
 109          for (slot = 0; slot < shader->info.num_inputs; slot++) {
 110             debug_printf("\t%d: %f %f %f %f\n", slot,
 111                          input[slot][0],
 112                          input[slot][1],
 113                          input[slot][2],
 114                          input[slot][3]);
 115          }
 116 #endif
 117
 118          for (slot = 0; slot < shader->info.num_inputs; slot++) {
 119             machine->Inputs[slot].xyzw[0].f[j] = input[slot][0];
 120             machine->Inputs[slot].xyzw[1].f[j] = input[slot][1];
 121             machine->Inputs[slot].xyzw[2].f[j] = input[slot][2];
 122             machine->Inputs[slot].xyzw[3].f[j] = input[slot][3];
 123          }
 124
 125          input = (const float (*)[4])((const char *)input + input_stride);
 126       }
 127
 128       /* run interpreter */
 129       tgsi_exec_machine_run( machine );
 130
 131       /* Unswizzle all output results.
 132        */
 133       for (j = 0; j < max_vertices; j++) {
 134          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 135             output[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 136             output[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 137             output[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 138             output[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 139
 140          }
 141
 142 #if 0
 143          debug_printf("%d) Post xform vert:\n", i + j);
 144          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 145             debug_printf("\t%d: %f %f %f %f\n", slot,
 146                          output[slot][0],
 147                          output[slot][1],
 148                          output[slot][2],
 149                          output[slot][3]);
 150          }
 151 #endif
 152
 153          output = (float (*)[4])((char *)output + output_stride);
 154       }
 155
 156    }
 157 }
 158
 159
 160
 161
 162 static void
 163 vs_exec_delete( struct draw_vertex_shader *dvs )
 164 {
 165    FREE((void*) dvs->state.tokens);
 166    FREE( dvs );
 167 }
 168
 169
 170 struct draw_vertex_shader *
 171 draw_create_vs_exec(struct draw_context *draw,
 172                     const struct pipe_shader_state *state)
 173 {
 174    struct exec_vertex_shader *vs = CALLOC_STRUCT( exec_vertex_shader );
 175
 176    if (vs == NULL)
 177       return NULL;
 178
 179    /* we make a private copy of the tokens */
 180    vs->base.state.tokens = tgsi_dup_tokens(state->tokens);
 181    if (!vs->base.state.tokens) {
 182       FREE(vs);
 183       return NULL;
 184    }
 185
 186    tgsi_scan_shader(state->tokens, &vs->base.info);
 187
 188    vs->base.draw = draw;
 189    vs->base.prepare = vs_exec_prepare;
 190    vs->base.run_linear = vs_exec_run_linear;
 191    vs->base.delete = vs_exec_delete;
 192    vs->base.create_varient = draw_vs_varient_generic;
 193    vs->machine = &draw->vs.machine;
 194
 195    return &vs->base;
 196 }