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 static INLINE unsigned
  45 compute_clipmask(const float *clip, /*const*/ float plane[][4], unsigned nr)
  46 {
  47    unsigned mask = 0;
  48    unsigned i;
  49
  50    /* Do the hardwired planes first:
  51     */
  52    if (-clip[0] + clip[3] < 0) mask |= CLIP_RIGHT_BIT;
  53    if ( clip[0] + clip[3] < 0) mask |= CLIP_LEFT_BIT;
  54    if (-clip[1] + clip[3] < 0) mask |= CLIP_TOP_BIT;
  55    if ( clip[1] + clip[3] < 0) mask |= CLIP_BOTTOM_BIT;
  56    if (-clip[2] + clip[3] < 0) mask |= CLIP_FAR_BIT;
  57    if ( clip[2] + clip[3] < 0) mask |= CLIP_NEAR_BIT;
  58
  59    /* Followed by any remaining ones:
  60     */
  61    for (i = 6; i < nr; i++) {
  62       if (dot4(clip, plane[i]) < 0)
  63          mask |= (1<<i);
  64    }
  65
  66    return mask;
  67 }
  68
  69
  70 static void
  71 vs_exec_prepare( struct draw_vertex_shader *shader,
  72                  struct draw_context *draw )
  73 {
  74    /* specify the vertex program to interpret/execute */
  75    tgsi_exec_machine_bind_shader(&draw->machine,
  76                                  shader->state.tokens,
  77                                  PIPE_MAX_SAMPLERS,
  78                                  NULL /*samplers*/ );
  79
  80    draw_update_vertex_fetch( draw );
  81 }
  82
  83
  84 /**
  85  * Transform vertices with the current vertex program/shader
  86  * Up to four vertices can be shaded at a time.
  87  * \param vbuffer  the input vertex data
  88  * \param elts  indexes of four input vertices
  89  * \param count  number of vertices to shade [1..4]
  90  * \param vOut  array of pointers to four output vertices
  91  */
  92 static void
  93 vs_exec_run( struct draw_vertex_shader *shader,
  94              struct draw_context *draw,
  95              const unsigned *elts,
  96              unsigned count,
  97              struct vertex_header *vOut[] )
  98 {
  99    struct tgsi_exec_machine *machine = &draw->machine;
 100    unsigned int j;
 101
 102    ALIGN16_DECL(struct tgsi_exec_vector, inputs, PIPE_MAX_ATTRIBS);
 103    ALIGN16_DECL(struct tgsi_exec_vector, outputs, PIPE_MAX_ATTRIBS);
 104    const float *scale = draw->viewport.scale;
 105    const float *trans = draw->viewport.translate;
 106
 107    assert(count <= 4);
 108    assert(draw->vertex_shader->info.output_semantic_name[0]
 109           == TGSI_SEMANTIC_POSITION);
 110
 111    machine->Consts = (float (*)[4]) draw->user.constants;
 112    machine->Inputs = ALIGN16_ASSIGN(inputs);
 113    machine->Outputs = ALIGN16_ASSIGN(outputs);
 114
 115    draw->vertex_fetch.fetch_func( draw, machine, elts, count );
 116
 117    /* run interpreter */
 118    tgsi_exec_machine_run( machine );
 119
 120
 121    /* store machine results */
 122    for (j = 0; j < count; j++) {
 123       unsigned slot;
 124       float x, y, z, w;
 125
 126       /* Handle attr[0] (position) specially:
 127        *
 128        * XXX: Computing the clipmask should be done in the vertex
 129        * program as a set of DP4 instructions appended to the
 130        * user-provided code.
 131        */
 132       x = vOut[j]->clip[0] = machine->Outputs[0].xyzw[0].f[j];
 133       y = vOut[j]->clip[1] = machine->Outputs[0].xyzw[1].f[j];
 134       z = vOut[j]->clip[2] = machine->Outputs[0].xyzw[2].f[j];
 135       w = vOut[j]->clip[3] = machine->Outputs[0].xyzw[3].f[j];
 136
 137       if (!draw->rasterizer->bypass_clipping) {
 138          vOut[j]->clipmask = compute_clipmask(vOut[j]->clip, draw->plane, draw->nr_planes);
 139          vOut[j]->edgeflag = 1;
 140
 141          /* divide by w */
 142          w = 1.0f / w;
 143          x *= w;
 144          y *= w;
 145          z *= w;
 146
 147          /* Viewport mapping */
 148          vOut[j]->data[0][0] = x * scale[0] + trans[0];
 149          vOut[j]->data[0][1] = y * scale[1] + trans[1];
 150          vOut[j]->data[0][2] = z * scale[2] + trans[2];
 151          vOut[j]->data[0][3] = w;
 152       }
 153       else {
 154          vOut[j]->clipmask = 0;
 155          vOut[j]->edgeflag = 1;
 156          vOut[j]->data[0][0] = x;
 157          vOut[j]->data[0][1] = y;
 158          vOut[j]->data[0][2] = z;
 159          vOut[j]->data[0][3] = w;
 160       }
 161
 162       /* Remaining attributes are packed into sequential post-transform
 163        * vertex attrib slots.
 164        */
 165       for (slot = 1; slot < draw->num_vs_outputs; slot++) {
 166          vOut[j]->data[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 167          vOut[j]->data[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 168          vOut[j]->data[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 169          vOut[j]->data[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 170       }
 171
 172 #if 0 /*DEBUG*/
 173       printf("Post xform vert:\n");
 174       for (slot = 0; slot < draw->num_vs_outputs; slot++) {
 175          printf("%d: %f %f %f %f\n", slot,
 176                 vOut[j]->data[slot][0],
 177                 vOut[j]->data[slot][1],
 178                 vOut[j]->data[slot][2],
 179                 vOut[j]->data[slot][3]);
 180       }
 181 #endif
 182
 183
 184    } /* loop over vertices */
 185 }
 186
 187
 188
 189 static void
 190 vs_exec_delete( struct draw_vertex_shader *dvs )
 191 {
 192    FREE((void*) dvs->state.tokens);
 193    FREE( dvs );
 194 }
 195
 196
 197 struct draw_vertex_shader *
 198 draw_create_vs_exec(struct draw_context *draw,
 199                     const struct pipe_shader_state *state)
 200 {
 201    struct draw_vertex_shader *vs = CALLOC_STRUCT( draw_vertex_shader );
 202    uint nt = tgsi_num_tokens(state->tokens);
 203
 204    if (vs == NULL)
 205       return NULL;
 206
 207    /* we make a private copy of the tokens */
 208    vs->state.tokens = mem_dup(state->tokens, nt * sizeof(state->tokens[0]));
 209    vs->prepare = vs_exec_prepare;
 210    vs->run = vs_exec_run;
 211    vs->delete = vs_exec_delete;
 212
 213    return vs;
 214 }