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
   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 "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 static INLINE unsigned
  44 compute_clipmask(float cx, float cy, float cz, float cw)
  45 {
  46    unsigned mask = 0;
  47
  48    if (-cx + cw < 0) mask |= CLIP_RIGHT_BIT;
  49    if ( cx + cw < 0) mask |= CLIP_LEFT_BIT;
  50    if (-cy + cw < 0) mask |= CLIP_TOP_BIT;
  51    if ( cy + cw < 0) mask |= CLIP_BOTTOM_BIT;
  52    if (-cz + cw < 0) mask |= CLIP_FAR_BIT;
  53    if ( cz + cw < 0) mask |= CLIP_NEAR_BIT;
  54
  55    return mask;
  56 }
  57
  58
  59
  60
  61 #if !defined(XSTDCALL)
  62 #if defined(WIN32)
  63 #define XSTDCALL __stdcall
  64 #else
  65 #define XSTDCALL
  66 #endif
  67 #endif
  68
  69 typedef void (XSTDCALL *codegen_function) (
  70    const struct tgsi_exec_vector *input,
  71    struct tgsi_exec_vector *output,
  72    float (*constant)[4],
  73    struct tgsi_exec_vector *temporary );
  74
  75
  76 /**
  77  * Transform vertices with the current vertex program/shader
  78  * Up to four vertices can be shaded at a time.
  79  * \param vbuffer  the input vertex data
  80  * \param elts  indexes of four input vertices
  81  * \param count  number of vertices to shade [1..4]
  82  * \param vOut  array of pointers to four output vertices
  83  */
  84 static void
  85 run_vertex_program(struct draw_context *draw,
  86                    unsigned elts[4], unsigned count,
  87                    struct vertex_header *vOut[])
  88 {
  89    struct tgsi_exec_machine machine;
  90    unsigned int j;
  91
  92    ALIGN16_DECL(struct tgsi_exec_vector, inputs, PIPE_ATTRIB_MAX);
  93    ALIGN16_DECL(struct tgsi_exec_vector, outputs, PIPE_ATTRIB_MAX);
  94    const float *scale = draw->viewport.scale;
  95    const float *trans = draw->viewport.translate;
  96
  97    assert(count <= 4);
  98    assert(draw->vertex_shader->state->output_semantic_name[0]
  99           == TGSI_SEMANTIC_POSITION);
 100
 101 #ifdef DEBUG
 102    memset( &machine, 0, sizeof( machine ) );
 103 #endif
 104
 105    /* init machine state */
 106    tgsi_exec_machine_init(&machine,
 107                           draw->vertex_shader->state->tokens,
 108                           PIPE_MAX_SAMPLERS,
 109                           NULL /*samplers*/ );
 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       codegen_function func = (codegen_function) draw->vertex_shader->state->executable;
 122       func(
 123          machine.Inputs,
 124          machine.Outputs,
 125          machine.Consts,
 126          machine.Temps );
 127    }
 128    else {
 129       tgsi_exec_machine_run( &machine );
 130    }
 131
 132
 133    /* store machine results */
 134    for (j = 0; j < count; j++) {
 135       unsigned slot;
 136       float x, y, z, w;
 137
 138       /* Handle attr[0] (position) specially: */
 139       x = vOut[j]->clip[0] = machine.Outputs[0].xyzw[0].f[j];
 140       y = vOut[j]->clip[1] = machine.Outputs[0].xyzw[1].f[j];
 141       z = vOut[j]->clip[2] = machine.Outputs[0].xyzw[2].f[j];
 142       w = vOut[j]->clip[3] = machine.Outputs[0].xyzw[3].f[j];
 143
 144       vOut[j]->clipmask = compute_clipmask(x, y, z, w) | draw->user_clipmask;
 145       vOut[j]->edgeflag = 1;
 146
 147       /* divide by w */
 148       w = 1.0f / w;
 149       x *= w;
 150       y *= w;
 151       z *= w;
 152
 153       /* Viewport mapping */
 154       vOut[j]->data[0][0] = x * scale[0] + trans[0];
 155       vOut[j]->data[0][1] = y * scale[1] + trans[1];
 156       vOut[j]->data[0][2] = z * scale[2] + trans[2];
 157       vOut[j]->data[0][3] = w;
 158
 159       /* Remaining attributes are packed into sequential post-transform
 160        * vertex attrib slots.
 161        * Skip 0 since we just did it above.
 162        * Subtract two because of the VERTEX_HEADER, CLIP_POS attribs.
 163        */
 164       for (slot = 1; slot < draw->vertex_info.num_attribs - 2; slot++) {
 165          vOut[j]->data[slot][0] = machine.Outputs[slot].xyzw[0].f[j];
 166          vOut[j]->data[slot][1] = machine.Outputs[slot].xyzw[1].f[j];
 167          vOut[j]->data[slot][2] = machine.Outputs[slot].xyzw[2].f[j];
 168          vOut[j]->data[slot][3] = machine.Outputs[slot].xyzw[3].f[j];
 169          /*
 170          printf("output %d: %f %f %f %f\n", slot,
 171                 vOut[j]->data[slot][0],
 172                 vOut[j]->data[slot][1],
 173                 vOut[j]->data[slot][2],
 174                 vOut[j]->data[slot][3]);
 175          */
 176       }
 177    } /* loop over vertices */
 178 }
 179
 180
 181 /**
 182  * Called by the draw module when the vertx cache needs to be flushed.
 183  * This involves running the vertex shader.
 184  */
 185 void draw_vertex_shader_queue_flush( struct draw_context *draw )
 186 {
 187    unsigned i, j;
 188
 189 //   fprintf(stderr, " q(%d) ", draw->vs.queue_nr );
 190
 191    /* run vertex shader on vertex cache entries, four per invokation */
 192    for (i = 0; i < draw->vs.queue_nr; i += 4) {
 193       struct vertex_header *dests[4];
 194       unsigned elts[4];
 195       int n;
 196
 197       for (j = 0; j < 4; j++) {
 198          elts[j] = draw->vs.queue[i + j].elt;
 199          dests[j] = draw->vs.queue[i + j].dest;
 200       }
 201
 202       n = MIN2(4, draw->vs.queue_nr - i);
 203       assert(n > 0);
 204       assert(n <= 4);
 205
 206       run_vertex_program(draw, elts, n, dests);
 207    }
 208
 209    draw->vs.queue_nr = 0;
 210 }
 211
 212
 213 void *
 214 draw_create_vertex_shader(struct draw_context *draw,
 215                           const struct pipe_shader_state *shader)
 216 {
 217    struct draw_vertex_shader *vs = calloc(1, sizeof(struct draw_vertex_shader));
 218
 219    vs->state = shader;
 220 #if defined(__i386__) || defined(__386__)
 221    x86_init_func(&vs->sse2_program);
 222
 223    tgsi_emit_sse2(shader->tokens, &vs->sse2_program);
 224
 225    ((struct pipe_shader_state*)(vs->state))->executable =
 226       x86_get_func(&vs->sse2_program);
 227 #endif
 228
 229    return vs;
 230 }
 231
 232 void draw_bind_vertex_shader(struct draw_context *draw,
 233                              void *vcso)
 234 {
 235    draw_flush(draw);
 236    draw->vertex_shader = (struct draw_vertex_shader*)(vcso);
 237 }
 238
 239 void draw_delete_vertex_shader(struct draw_context *draw,
 240                                void *vcso)
 241 {
 242    struct draw_vertex_shader *vs = (struct draw_vertex_shader*)(vcso);
 243 #if defined(__i386__) || defined(__386__)
 244    x86_release_func(&vs->sse2_program);
 245 #endif
 246    free(vcso);
 247 }
 248
 249
 250