src/mesa/pipe/draw/draw_vertex_shader.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
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  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 "draw_private.h"
  36 #include "draw_context.h"
  37 #include "draw_vertex.h"
  38
  39 #include "x86/rtasm/x86sse.h"
  40
  41 #include "pipe/tgsi/exec/tgsi_core.h"
  42
  43
  44 static INLINE float dot4(const float *a, const float *b)
  45 {
  46    float result = (a[0]*b[0] +
  47                    a[1]*b[1] +
  48                    a[2]*b[2] +
  49                    a[3]*b[3]);
  50
  51    return result;
  52 }
  53
  54 static INLINE unsigned
  55 compute_clipmask(const float *clip, const float (*plane)[4], unsigned nr)
  56 {
  57    unsigned mask = 0;
  58    unsigned i;
  59
  60    for (i = 0; i < nr; i++) {
  61       if (dot4(clip, plane[i]) < 0)
  62          mask |= (1<<i);
  63    }
  64
  65    return mask;
  66 }
  67
  68
  69
  70
  71 #if !defined(XSTDCALL)
  72 #if defined(WIN32)
  73 #define XSTDCALL __stdcall
  74 #else
  75 #define XSTDCALL
  76 #endif
  77 #endif
  78
  79 typedef void (XSTDCALL *codegen_function) (
  80    const struct tgsi_exec_vector *input,
  81    struct tgsi_exec_vector *output,
  82    float (*constant)[4],
  83    struct tgsi_exec_vector *temporary );
  84
  85
  86 /**
  87  * Transform vertices with the current vertex program/shader
  88  * Up to four vertices can be shaded at a time.
  89  * \param vbuffer  the input vertex data
  90  * \param elts  indexes of four input vertices
  91  * \param count  number of vertices to shade [1..4]
  92  * \param vOut  array of pointers to four output vertices
  93  */
  94 static void
  95 run_vertex_program(struct draw_context *draw,
  96                    unsigned elts[4], 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_ATTRIB_MAX);
 103    ALIGN16_DECL(struct tgsi_exec_vector, outputs, PIPE_ATTRIB_MAX);
 104    const float *scale = draw->viewport.scale;
 105    const float *trans = draw->viewport.translate;
 106
 107    assert(count <= 4);
 108    assert(draw->vertex_shader->state->output_semantic_name[0]
 109           == TGSI_SEMANTIC_POSITION);
 110
 111    /* Consts does not require 16 byte alignment. */
 112    machine->Consts = (float (*)[4]) draw->mapped_constants;
 113
 114    machine->Inputs = ALIGN16_ASSIGN(inputs);
 115    machine->Outputs = ALIGN16_ASSIGN(outputs);
 116
 117    draw_vertex_fetch( draw, machine, elts, count );
 118
 119    /* run shader */
 120    if( draw->vertex_shader->state->executable != NULL ) {
 121       /* SSE */
 122       codegen_function func = (codegen_function) draw->vertex_shader->state->executable;
 123       func(
 124          machine->Inputs,
 125          machine->Outputs,
 126          machine->Consts,
 127          machine->Temps );
 128    }
 129    else {
 130       /* interpreter */
 131       tgsi_exec_machine_run( machine );
 132    }
 133
 134
 135    /* store machine results */
 136    for (j = 0; j < count; j++) {
 137       unsigned slot;
 138       float x, y, z, w;
 139
 140       /* Handle attr[0] (position) specially:
 141        *
 142        * XXX: Computing the clipmask should be done in the vertex
 143        * program as a set of DP4 instructions appended to the
 144        * user-provided code.
 145        */
 146       x = vOut[j]->clip[0] = machine->Outputs[0].xyzw[0].f[j];
 147       y = vOut[j]->clip[1] = machine->Outputs[0].xyzw[1].f[j];
 148       z = vOut[j]->clip[2] = machine->Outputs[0].xyzw[2].f[j];
 149       w = vOut[j]->clip[3] = machine->Outputs[0].xyzw[3].f[j];
 150
 151       vOut[j]->clipmask = compute_clipmask(vOut[j]->clip, draw->plane, draw->nr_planes);
 152       vOut[j]->edgeflag = 1;
 153
 154       /* divide by w */
 155       w = 1.0f / w;
 156       x *= w;
 157       y *= w;
 158       z *= w;
 159
 160       /* Viewport mapping */
 161       vOut[j]->data[0][0] = x * scale[0] + trans[0];
 162       vOut[j]->data[0][1] = y * scale[1] + trans[1];
 163       vOut[j]->data[0][2] = z * scale[2] + trans[2];
 164       vOut[j]->data[0][3] = w;
 165
 166       /* Remaining attributes are packed into sequential post-transform
 167        * vertex attrib slots.
 168        * Skip 0 since we just did it above.
 169        * Subtract two because of the VERTEX_HEADER, CLIP_POS attribs.
 170        */
 171       for (slot = 1; slot < draw->vertex_info.num_attribs - 2; slot++) {
 172          vOut[j]->data[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 173          vOut[j]->data[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 174          vOut[j]->data[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 175          vOut[j]->data[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 176          /*
 177          printf("output %d: %f %f %f %f\n", slot,
 178                 vOut[j]->data[slot][0],
 179                 vOut[j]->data[slot][1],
 180                 vOut[j]->data[slot][2],
 181                 vOut[j]->data[slot][3]);
 182          */
 183       }
 184    } /* loop over vertices */
 185 }
 186
 187
 188 /**
 189  * Called by the draw module when the vertx cache needs to be flushed.
 190  * This involves running the vertex shader.
 191  */
 192 void draw_vertex_shader_queue_flush( struct draw_context *draw )
 193 {
 194    unsigned i, j;
 195
 196 //   fprintf(stderr, " q(%d) ", draw->vs.queue_nr );
 197
 198    /* run vertex shader on vertex cache entries, four per invokation */
 199    for (i = 0; i < draw->vs.queue_nr; i += 4) {
 200       struct vertex_header *dests[4];
 201       unsigned elts[4];
 202       int n;
 203
 204       for (j = 0; j < 4; j++) {
 205          elts[j] = draw->vs.queue[i + j].elt;
 206          dests[j] = draw->vs.queue[i + j].dest;
 207       }
 208
 209       n = MIN2(4, draw->vs.queue_nr - i);
 210       assert(n > 0);
 211       assert(n <= 4);
 212
 213       run_vertex_program(draw, elts, n, dests);
 214    }
 215
 216    draw->vs.queue_nr = 0;
 217 }
 218
 219
 220 void *
 221 draw_create_vertex_shader(struct draw_context *draw,
 222                           const struct pipe_shader_state *shader)
 223 {
 224    struct draw_vertex_shader *vs = calloc(1, sizeof(struct draw_vertex_shader));
 225
 226    vs->state = shader;
 227 #if defined(__i386__) || defined(__386__)
 228    x86_init_func(&vs->sse2_program);
 229
 230    if (draw->use_sse) {
 231       tgsi_emit_sse2(shader->tokens, &vs->sse2_program);
 232       ((struct pipe_shader_state*)(vs->state))->executable =
 233          x86_get_func(&vs->sse2_program);
 234    }
 235 #endif
 236
 237    return vs;
 238 }
 239
 240 void draw_bind_vertex_shader(struct draw_context *draw,
 241                              void *vcso)
 242 {
 243    draw_flush(draw);
 244    draw->vertex_shader = (struct draw_vertex_shader*)(vcso);
 245
 246    /* specify the fragment program to interpret/execute */
 247    tgsi_exec_machine_init(&draw->machine,
 248                           draw->vertex_shader->state->tokens,
 249                           PIPE_MAX_SAMPLERS,
 250                           NULL /*samplers*/ );
 251 }
 252
 253 void draw_delete_vertex_shader(struct draw_context *draw,
 254                                void *vcso)
 255 {
 256    struct draw_vertex_shader *vs = (struct draw_vertex_shader*)(vcso);
 257 #if defined(__i386__) || defined(__386__)
 258    x86_release_func(&vs->sse2_program);
 259 #endif
 260    free(vcso);
 261 }
 262
 263
 264