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
  42 static INLINE unsigned
  43 compute_clipmask(const float *clip, /*const*/ float plane[][4], unsigned nr)
  44 {
  45    unsigned mask = 0;
  46    unsigned i;
  47
  48    /* Do the hardwired planes first:
  49     */
  50    if (-clip[0] + clip[3] < 0) mask |= CLIP_RIGHT_BIT;
  51    if ( clip[0] + clip[3] < 0) mask |= CLIP_LEFT_BIT;
  52    if (-clip[1] + clip[3] < 0) mask |= CLIP_TOP_BIT;
  53    if ( clip[1] + clip[3] < 0) mask |= CLIP_BOTTOM_BIT;
  54    if (-clip[2] + clip[3] < 0) mask |= CLIP_FAR_BIT;
  55    if ( clip[2] + clip[3] < 0) mask |= CLIP_NEAR_BIT;
  56
  57    /* Followed by any remaining ones:
  58     */
  59    for (i = 6; i < nr; i++) {
  60       if (dot4(clip, plane[i]) < 0)
  61          mask |= (1<<i);
  62    }
  63
  64    return mask;
  65 }
  66
  67
  68 static void
  69 vs_exec_prepare( struct draw_vertex_shader *shader,
  70                  struct draw_context *draw )
  71 {
  72    /* specify the vertex program to interpret/execute */
  73    tgsi_exec_machine_bind_shader(&draw->machine,
  74                                  shader->state->tokens,
  75                                  PIPE_MAX_SAMPLERS,
  76                                  NULL /*samplers*/ );
  77
  78    draw_update_vertex_fetch( draw );
  79 }
  80
  81
  82 /**
  83  * Transform vertices with the current vertex program/shader
  84  * Up to four vertices can be shaded at a time.
  85  * \param vbuffer  the input vertex data
  86  * \param elts  indexes of four input vertices
  87  * \param count  number of vertices to shade [1..4]
  88  * \param vOut  array of pointers to four output vertices
  89  */
  90 static void
  91 vs_exec_run( struct draw_vertex_shader *shader,
  92              struct draw_context *draw,
  93              const unsigned *elts,
  94              unsigned count,
  95              struct vertex_header *vOut[] )
  96 {
  97    struct tgsi_exec_machine *machine = &draw->machine;
  98    unsigned int j;
  99
 100    ALIGN16_DECL(struct tgsi_exec_vector, inputs, PIPE_ATTRIB_MAX);
 101    ALIGN16_DECL(struct tgsi_exec_vector, outputs, PIPE_ATTRIB_MAX);
 102    const float *scale = draw->viewport.scale;
 103    const float *trans = draw->viewport.translate;
 104
 105    assert(count <= 4);
 106    assert(draw->vertex_shader->info.output_semantic_name[0]
 107           == TGSI_SEMANTIC_POSITION);
 108
 109    machine->Consts = (float (*)[4]) draw->user.constants;
 110    machine->Inputs = ALIGN16_ASSIGN(inputs);
 111    machine->Outputs = ALIGN16_ASSIGN(outputs);
 112
 113    draw->vertex_fetch.fetch_func( draw, machine, elts, count );
 114
 115    /* run interpreter */
 116    tgsi_exec_machine_run( machine );
 117
 118
 119    /* store machine results */
 120    for (j = 0; j < count; j++) {
 121       unsigned slot;
 122       float x, y, z, w;
 123
 124       /* Handle attr[0] (position) specially:
 125        *
 126        * XXX: Computing the clipmask should be done in the vertex
 127        * program as a set of DP4 instructions appended to the
 128        * user-provided code.
 129        */
 130       x = vOut[j]->clip[0] = machine->Outputs[0].xyzw[0].f[j];
 131       y = vOut[j]->clip[1] = machine->Outputs[0].xyzw[1].f[j];
 132       z = vOut[j]->clip[2] = machine->Outputs[0].xyzw[2].f[j];
 133       w = vOut[j]->clip[3] = machine->Outputs[0].xyzw[3].f[j];
 134
 135       vOut[j]->clipmask = compute_clipmask(vOut[j]->clip, draw->plane, draw->nr_planes);
 136       vOut[j]->edgeflag = 1;
 137
 138       /* divide by w */
 139       w = 1.0f / w;
 140       x *= w;
 141       y *= w;
 142       z *= w;
 143
 144       /* Viewport mapping */
 145       vOut[j]->data[0][0] = x * scale[0] + trans[0];
 146       vOut[j]->data[0][1] = y * scale[1] + trans[1];
 147       vOut[j]->data[0][2] = z * scale[2] + trans[2];
 148       vOut[j]->data[0][3] = w;
 149
 150       /* Remaining attributes are packed into sequential post-transform
 151        * vertex attrib slots.
 152        */
 153       for (slot = 1; slot < draw->num_vs_outputs; slot++) {
 154          vOut[j]->data[slot][0] = machine->Outputs[slot].xyzw[0].f[j];
 155          vOut[j]->data[slot][1] = machine->Outputs[slot].xyzw[1].f[j];
 156          vOut[j]->data[slot][2] = machine->Outputs[slot].xyzw[2].f[j];
 157          vOut[j]->data[slot][3] = machine->Outputs[slot].xyzw[3].f[j];
 158       }
 159    } /* loop over vertices */
 160 }
 161
 162
 163
 164 static void
 165 vs_exec_delete( struct draw_vertex_shader *dvs )
 166 {
 167    FREE( dvs );
 168 }
 169
 170
 171 struct draw_vertex_shader *
 172 draw_create_vs_exec(struct draw_context *draw,
 173                     const struct pipe_shader_state *state)
 174 {
 175    struct draw_vertex_shader *vs = CALLOC_STRUCT( draw_vertex_shader );
 176
 177    if (vs == NULL)
 178       return NULL;
 179
 180    vs->state = state;
 181    vs->prepare = vs_exec_prepare;
 182    vs->run = vs_exec_run;
 183    vs->delete = vs_exec_delete;
 184
 185    return vs;
 186 }