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 #define MAX_TGSI_VERTICES 4
  44
  45 static void
  46 vs_exec_prepare( struct draw_vertex_shader *shader,
  47                  struct draw_context *draw )
  48 {
  49    /* specify the vertex program to interpret/execute */
  50    tgsi_exec_machine_bind_shader(&draw->machine,
  51                                  shader->state.tokens,
  52                                  PIPE_MAX_SAMPLERS,
  53                                  NULL /*samplers*/ );
  54
  55    draw_update_vertex_fetch( draw );
  56 }
  57
  58
  59 /**
  60  * Transform vertices with the current vertex program/shader
  61  * Up to four vertices can be shaded at a time.
  62  * \param vbuffer  the input vertex data
  63  * \param elts  indexes of four input vertices
  64  * \param count  number of vertices to shade [1..4]
  65  * \param vOut  array of pointers to four output vertices
  66  */
  67 static boolean
  68 vs_exec_run( struct draw_vertex_shader *shader,
  69              struct draw_context *draw,
  70              const unsigned *elts,
  71              unsigned count,
  72              void *vOut )
  73 {
  74    struct tgsi_exec_machine *machine = &draw->machine;
  75    unsigned int i, j;
  76    unsigned int clipped = 0;
  77
  78    ALIGN16_DECL(struct tgsi_exec_vector, inputs, PIPE_MAX_ATTRIBS);
  79    ALIGN16_DECL(struct tgsi_exec_vector, outputs, PIPE_MAX_ATTRIBS);
  80    const float *scale = draw->viewport.scale;
  81    const float *trans = draw->viewport.translate;
  82
  83    assert(draw->vertex_shader->info.output_semantic_name[0]
  84           == TGSI_SEMANTIC_POSITION);
  85
  86    machine->Consts = (float (*)[4]) draw->user.constants;
  87    machine->Inputs = ALIGN16_ASSIGN(inputs);
  88    if (draw->rasterizer->bypass_vs) {
  89       /* outputs are just the inputs */
  90       machine->Outputs = machine->Inputs;
  91    }
  92    else {
  93       machine->Outputs = ALIGN16_ASSIGN(outputs);
  94    }
  95
  96    for (i = 0; i < count; i += MAX_TGSI_VERTICES) {
  97       unsigned int max_vertices = MIN2(MAX_TGSI_VERTICES, count - i);
  98       draw->vertex_fetch.fetch_func( draw, machine, &elts[i], max_vertices );
  99
 100       if (!draw->rasterizer->bypass_vs) {
 101          /* run interpreter */
 102          tgsi_exec_machine_run( machine );
 103       }
 104
 105       /* store machine results */
 106       for (j = 0; j < max_vertices; j++) {
 107          unsigned slot;
 108          float x, y, z, w;
 109          struct vertex_header *out =
 110             draw_header_from_block(vOut, i + j);
 111
 112          /* Handle attr[0] (position) specially:
 113           *
 114           * XXX: Computing the clipmask should be done in the vertex
 115           * program as a set of DP4 instructions appended to the
 116           * user-provided code.
 117           */
 118          x = out->clip[0] = machine->Outputs[0].xyzw[0].f[j];
 119          y = out->clip[1] = machine->Outputs[0].xyzw[1].f[j];
 120          z = out->clip[2] = machine->Outputs[0].xyzw[2].f[j];
 121          w = out->clip[3] = machine->Outputs[0].xyzw[3].f[j];
 122
 123          if (!draw->rasterizer->bypass_clipping) {
 124             out->clipmask = compute_clipmask(out->clip, draw->plane,
 125                                              draw->nr_planes);
 126             clipped += out->clipmask;
 127
 128             /* divide by w */
 129             w = 1.0f / w;
 130             x *= w;
 131             y *= w;
 132             z *= w;
 133          }
 134          else {
 135             out->clipmask = 0;
 136          }
 137          out->edgeflag = 1;
 138
 139          if (!draw->identity_viewport) {
 140             /* Viewport mapping */
 141             out->data[0][0] = x * scale[0] + trans[0];
 142             out->data[0][1] = y * scale[1] + trans[1];
 143             out->data[0][2] = z * scale[2] + trans[2];
 144             out->data[0][3] = w;
 145          }
 146          else {
 147             out->data[0][0] = x;
 148             out->data[0][1] = y;
 149             out->data[0][2] = z;
 150             out->data[0][3] = w;
 151          }
 152
 153          /* Remaining attributes are packed into sequential post-transform
 154           * vertex attrib slots.
 155           */
 156          for (slot = 1; slot < draw->num_vs_outputs; slot++) {
 157             out->data[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 158             out->data[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 159             out->data[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 160             out->data[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 161          }
 162
 163 #if 0 /*DEBUG*/
 164          printf("%d) Post xform vert:\n", i + j);
 165          for (slot = 0; slot < draw->num_vs_outputs; slot++) {
 166             printf("\t%d: %f %f %f %f\n", slot,
 167                    out->data[slot][0],
 168                    out->data[slot][1],
 169                    out->data[slot][2],
 170                    out->data[slot][3]);
 171          }
 172 #endif
 173       } /* loop over vertices */
 174    }
 175    return clipped != 0;
 176 }
 177
 178
 179
 180 static void
 181 vs_exec_delete( struct draw_vertex_shader *dvs )
 182 {
 183    FREE((void*) dvs->state.tokens);
 184    FREE( dvs );
 185 }
 186
 187
 188 struct draw_vertex_shader *
 189 draw_create_vs_exec(struct draw_context *draw,
 190                     const struct pipe_shader_state *state)
 191 {
 192    struct draw_vertex_shader *vs = CALLOC_STRUCT( draw_vertex_shader );
 193    uint nt = tgsi_num_tokens(state->tokens);
 194
 195    if (vs == NULL)
 196       return NULL;
 197
 198    /* we make a private copy of the tokens */
 199    vs->state.tokens = mem_dup(state->tokens, nt * sizeof(state->tokens[0]));
 200    vs->prepare = vs_exec_prepare;
 201    vs->run = vs_exec_run;
 202    vs->delete = vs_exec_delete;
 203
 204    return vs;
 205 }