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 = &draw->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    /* Consts does not require 16 byte alignment. */
 102    machine->Consts = (float (*)[4]) draw->mapped_constants;
 103
 104    machine->Inputs = ALIGN16_ASSIGN(inputs);
 105    machine->Outputs = ALIGN16_ASSIGN(outputs);
 106
 107    draw_vertex_fetch( draw, machine, elts, count );
 108
 109    /* run shader */
 110    if( draw->vertex_shader->state->executable != NULL ) {
 111       /* SSE */
 112       codegen_function func = (codegen_function) draw->vertex_shader->state->executable;
 113       func(
 114          machine->Inputs,
 115          machine->Outputs,
 116          machine->Consts,
 117          machine->Temps );
 118    }
 119    else {
 120       /* interpreter */
 121       tgsi_exec_machine_run( machine );
 122    }
 123
 124
 125    /* store machine results */
 126    for (j = 0; j < count; j++) {
 127       unsigned slot;
 128       float x, y, z, w;
 129
 130       /* Handle attr[0] (position) specially: */
 131       x = vOut[j]->clip[0] = machine->Outputs[0].xyzw[0].f[j];
 132       y = vOut[j]->clip[1] = machine->Outputs[0].xyzw[1].f[j];
 133       z = vOut[j]->clip[2] = machine->Outputs[0].xyzw[2].f[j];
 134       w = vOut[j]->clip[3] = machine->Outputs[0].xyzw[3].f[j];
 135
 136       vOut[j]->clipmask = compute_clipmask(x, y, z, w) | draw->user_clipmask;
 137       vOut[j]->edgeflag = 1;
 138
 139       /* divide by w */
 140       w = 1.0f / w;
 141       x *= w;
 142       y *= w;
 143       z *= w;
 144
 145       /* Viewport mapping */
 146       vOut[j]->data[0][0] = x * scale[0] + trans[0];
 147       vOut[j]->data[0][1] = y * scale[1] + trans[1];
 148       vOut[j]->data[0][2] = z * scale[2] + trans[2];
 149       vOut[j]->data[0][3] = w;
 150
 151       /* Remaining attributes are packed into sequential post-transform
 152        * vertex attrib slots.
 153        * Skip 0 since we just did it above.
 154        * Subtract two because of the VERTEX_HEADER, CLIP_POS attribs.
 155        */
 156       for (slot = 1; slot < draw->vertex_info.num_attribs - 2; slot++) {
 157          vOut[j]->data[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 158          vOut[j]->data[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 159          vOut[j]->data[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 160          vOut[j]->data[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 161          /*
 162          printf("output %d: %f %f %f %f\n", slot,
 163                 vOut[j]->data[slot][0],
 164                 vOut[j]->data[slot][1],
 165                 vOut[j]->data[slot][2],
 166                 vOut[j]->data[slot][3]);
 167          */
 168       }
 169    } /* loop over vertices */
 170 }
 171
 172
 173 /**
 174  * Called by the draw module when the vertx cache needs to be flushed.
 175  * This involves running the vertex shader.
 176  */
 177 void draw_vertex_shader_queue_flush( struct draw_context *draw )
 178 {
 179    unsigned i, j;
 180
 181 //   fprintf(stderr, " q(%d) ", draw->vs.queue_nr );
 182
 183    /* run vertex shader on vertex cache entries, four per invokation */
 184    for (i = 0; i < draw->vs.queue_nr; i += 4) {
 185       struct vertex_header *dests[4];
 186       unsigned elts[4];
 187       int n;
 188
 189       for (j = 0; j < 4; j++) {
 190          elts[j] = draw->vs.queue[i + j].elt;
 191          dests[j] = draw->vs.queue[i + j].dest;
 192       }
 193
 194       n = MIN2(4, draw->vs.queue_nr - i);
 195       assert(n > 0);
 196       assert(n <= 4);
 197
 198       run_vertex_program(draw, elts, n, dests);
 199    }
 200
 201    draw->vs.queue_nr = 0;
 202 }
 203
 204
 205 void *
 206 draw_create_vertex_shader(struct draw_context *draw,
 207                           const struct pipe_shader_state *shader)
 208 {
 209    struct draw_vertex_shader *vs = calloc(1, sizeof(struct draw_vertex_shader));
 210
 211    vs->state = shader;
 212 #if defined(__i386__) || defined(__386__)
 213    x86_init_func(&vs->sse2_program);
 214
 215    if (draw->use_sse) {
 216       tgsi_emit_sse2(shader->tokens, &vs->sse2_program);
 217       ((struct pipe_shader_state*)(vs->state))->executable =
 218          x86_get_func(&vs->sse2_program);
 219    }
 220 #endif
 221
 222    return vs;
 223 }
 224
 225 void draw_bind_vertex_shader(struct draw_context *draw,
 226                              void *vcso)
 227 {
 228    draw_flush(draw);
 229    draw->vertex_shader = (struct draw_vertex_shader*)(vcso);
 230
 231    /* specify the fragment program to interpret/execute */
 232    tgsi_exec_machine_init(&draw->machine,
 233                           draw->vertex_shader->state->tokens,
 234                           PIPE_MAX_SAMPLERS,
 235                           NULL /*samplers*/ );
 236 }
 237
 238 void draw_delete_vertex_shader(struct draw_context *draw,
 239                                void *vcso)
 240 {
 241    struct draw_vertex_shader *vs = (struct draw_vertex_shader*)(vcso);
 242 #if defined(__i386__) || defined(__386__)
 243    x86_release_func(&vs->sse2_program);
 244 #endif
 245    free(vcso);
 246 }
 247
 248
 249