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 "pipe/p_util.h"
  35 #include "pipe/p_shader_tokens.h"
  36
  37 #include "draw_private.h"
  38 #include "draw_context.h"
  39 #include "draw_vs.h"
  40
  41 #include "tgsi/util/tgsi_parse.h"
  42
  43
  44 struct exec_vertex_shader {
  45    struct draw_vertex_shader base;
  46    struct tgsi_exec_machine *machine;
  47 };
  48
  49 static struct exec_vertex_shader *exec_vertex_shader( struct draw_vertex_shader *vs )
  50 {
  51    return (struct exec_vertex_shader *)vs;
  52 }
  53
  54
  55 /* Not required for run_linear.
  56  */
  57 static void
  58 vs_exec_prepare( struct draw_vertex_shader *shader,
  59                  struct draw_context *draw )
  60 {
  61    /* specify the vertex program to interpret/execute */
  62    tgsi_exec_machine_bind_shader(&draw->machine,
  63                                  shader->state.tokens,
  64                                  PIPE_MAX_SAMPLERS,
  65                                  NULL /*samplers*/ );
  66
  67    draw_update_vertex_fetch( draw );
  68 }
  69
  70
  71 /**
  72  * Transform vertices with the current vertex program/shader
  73  * Up to four vertices can be shaded at a time.
  74  * \param vbuffer  the input vertex data
  75  * \param elts  indexes of four input vertices
  76  * \param count  number of vertices to shade [1..4]
  77  * \param vOut  array of pointers to four output vertices
  78  */
  79 static boolean
  80 vs_exec_run( struct draw_vertex_shader *shader,
  81              struct draw_context *draw,
  82              const unsigned *elts,
  83              unsigned count,
  84              void *vOut,
  85              unsigned vertex_size)
  86 {
  87    struct tgsi_exec_machine *machine = &draw->machine;
  88    unsigned int i, j;
  89    unsigned int clipped = 0;
  90
  91    ALIGN16_DECL(struct tgsi_exec_vector, inputs, PIPE_MAX_ATTRIBS);
  92    ALIGN16_DECL(struct tgsi_exec_vector, outputs, PIPE_MAX_ATTRIBS);
  93    const float *scale = draw->viewport.scale;
  94    const float *trans = draw->viewport.translate;
  95
  96    assert(shader->info.output_semantic_name[0] == TGSI_SEMANTIC_POSITION);
  97
  98    machine->Consts = (const float (*)[4]) draw->user.constants;
  99    machine->Inputs = ALIGN16_ASSIGN(inputs);
 100    if (draw->rasterizer->bypass_vs) {
 101       /* outputs are just the inputs */
 102       machine->Outputs = machine->Inputs;
 103    }
 104    else {
 105       machine->Outputs = ALIGN16_ASSIGN(outputs);
 106    }
 107
 108    for (i = 0; i < count; i += MAX_TGSI_VERTICES) {
 109       unsigned int max_vertices = MIN2(MAX_TGSI_VERTICES, count - i);
 110       draw->vertex_fetch.fetch_func( draw, machine, &elts[i], max_vertices );
 111
 112       if (!draw->rasterizer->bypass_vs) {
 113          /* run interpreter */
 114          tgsi_exec_machine_run( machine );
 115       }
 116
 117       /* store machine results */
 118       for (j = 0; j < max_vertices; j++) {
 119          unsigned slot;
 120          float x, y, z, w;
 121          struct vertex_header *out =
 122             draw_header_from_block(vOut, vertex_size, i + j);
 123
 124          /* Handle attr[0] (position) specially:
 125           *
 126           * XXX: Computing the clipmask should be done in the vertex
 127           * program as a set of DP4 instructions appended to the
 128           * user-provided code.
 129           */
 130          x = out->clip[0] = machine->Outputs[0].xyzw[0].f[j];
 131          y = out->clip[1] = machine->Outputs[0].xyzw[1].f[j];
 132          z = out->clip[2] = machine->Outputs[0].xyzw[2].f[j];
 133          w = out->clip[3] = machine->Outputs[0].xyzw[3].f[j];
 134
 135          if (!draw->rasterizer->bypass_clipping) {
 136             out->clipmask = compute_clipmask(out->clip, draw->plane,
 137                                              draw->nr_planes);
 138             clipped += out->clipmask;
 139
 140             /* divide by w */
 141             w = 1.0f / w;
 142             x *= w;
 143             y *= w;
 144             z *= w;
 145          }
 146          else {
 147             out->clipmask = 0;
 148          }
 149          out->edgeflag = 1;
 150          out->vertex_id = UNDEFINED_VERTEX_ID;
 151
 152          if (!draw->identity_viewport) {
 153             /* Viewport mapping */
 154             out->data[0][0] = x * scale[0] + trans[0];
 155             out->data[0][1] = y * scale[1] + trans[1];
 156             out->data[0][2] = z * scale[2] + trans[2];
 157             out->data[0][3] = w;
 158          }
 159          else {
 160             out->data[0][0] = x;
 161             out->data[0][1] = y;
 162             out->data[0][2] = z;
 163             out->data[0][3] = w;
 164          }
 165
 166          /* Remaining attributes are packed into sequential post-transform
 167           * vertex attrib slots.
 168           */
 169          for (slot = 1; slot < draw->num_vs_outputs; slot++) {
 170             out->data[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 171             out->data[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 172             out->data[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 173             out->data[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 174          }
 175
 176 #if 0 /*DEBUG*/
 177          printf("%d) Post xform vert:\n", i + j);
 178          for (slot = 0; slot < draw->num_vs_outputs; slot++) {
 179             printf("\t%d: %f %f %f %f\n", slot,
 180                    out->data[slot][0],
 181                    out->data[slot][1],
 182                    out->data[slot][2],
 183                    out->data[slot][3]);
 184          }
 185 #endif
 186       } /* loop over vertices */
 187    }
 188    return clipped != 0;
 189 }
 190
 191
 192
 193 /* Simplified vertex shader interface for the pt paths.  Given the
 194  * complexity of code-generating all the above operations together,
 195  * it's time to try doing all the other stuff separately.
 196  */
 197 static void
 198 vs_exec_run_linear( struct draw_vertex_shader *shader,
 199                     const float (*input)[4],
 200                     float (*output)[4],
 201                     const float (*constants)[4],
 202                     unsigned count,
 203                     unsigned input_stride,
 204                     unsigned output_stride )
 205 {
 206    struct exec_vertex_shader *evs = exec_vertex_shader(shader);
 207    struct tgsi_exec_machine *machine = evs->machine;
 208    unsigned int i, j;
 209    unsigned slot;
 210
 211    machine->Consts = constants;
 212
 213    for (i = 0; i < count; i += MAX_TGSI_VERTICES) {
 214       unsigned int max_vertices = MIN2(MAX_TGSI_VERTICES, count - i);
 215
 216       /* Swizzle inputs.
 217        */
 218       for (j = 0; j < max_vertices; j++) {
 219          for (slot = 0; slot < shader->info.num_inputs; slot++) {
 220             machine->Inputs[slot].xyzw[0].f[j] = input[slot][0];
 221             machine->Inputs[slot].xyzw[1].f[j] = input[slot][1];
 222             machine->Inputs[slot].xyzw[2].f[j] = input[slot][2];
 223             machine->Inputs[slot].xyzw[3].f[j] = input[slot][3];
 224          }
 225       }
 226
 227       /* run interpreter */
 228       tgsi_exec_machine_run( machine );
 229
 230       /* Unswizzle all output results.
 231        */
 232       for (j = 0; j < max_vertices; j++) {
 233          for (slot = 0; slot < shader->info.num_outputs; slot++) {
 234             output[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 235             output[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 236             output[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 237             output[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 238          }
 239       }
 240
 241       /* Advance input, output pointers:
 242        */
 243       input = (const float (*)[4])((const char *)input + input_stride);
 244       output = (float (*)[4])((char *)output + output_stride);
 245    }
 246 }
 247
 248
 249
 250
 251 static void
 252 vs_exec_delete( struct draw_vertex_shader *dvs )
 253 {
 254    FREE((void*) dvs->state.tokens);
 255    FREE( dvs );
 256 }
 257
 258
 259 struct draw_vertex_shader *
 260 draw_create_vs_exec(struct draw_context *draw,
 261                     const struct pipe_shader_state *state)
 262 {
 263    struct exec_vertex_shader *vs = CALLOC_STRUCT( exec_vertex_shader );
 264    uint nt = tgsi_num_tokens(state->tokens);
 265
 266    if (vs == NULL)
 267       return NULL;
 268
 269    /* we make a private copy of the tokens */
 270    vs->base.state.tokens = mem_dup(state->tokens, nt * sizeof(state->tokens[0]));
 271    tgsi_scan_shader(state->tokens, &vs->base.info);
 272
 273
 274    vs->base.prepare = vs_exec_prepare;
 275    vs->base.run = vs_exec_run;
 276    vs->base.run_linear = vs_exec_run_linear;
 277    vs->base.delete = vs_exec_delete;
 278    vs->machine = &draw->machine;
 279
 280
 281    return &vs->base;
 282 }