src/gallium/drivers/softpipe/sp_fs_exec.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
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   7  * copy of this software and associated documentation files (the
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  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
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  25  *
  26  **************************************************************************/
  27
  28 /**
  29  * Execute fragment shader using the TGSI interpreter.
  30  */
  31
  32 #include "sp_context.h"
  33 #include "sp_state.h"
  34 #include "sp_fs.h"
  35 #include "sp_quad.h"
  36
  37 #include "pipe/p_state.h"
  38 #include "pipe/p_defines.h"
  39 #include "util/u_memory.h"
  40 #include "tgsi/tgsi_exec.h"
  41 #include "tgsi/tgsi_parse.h"
  42
  43
  44 /**
  45  * Subclass of sp_fragment_shader_variant
  46  */
  47 struct sp_exec_fragment_shader
  48 {
  49    struct sp_fragment_shader_variant base;
  50    /* No other members for now */
  51 };
  52
  53
  54 /** cast wrapper */
  55 static INLINE struct sp_exec_fragment_shader *
  56 sp_exec_fragment_shader(const struct sp_fragment_shader_variant *var)
  57 {
  58    return (struct sp_exec_fragment_shader *) var;
  59 }
  60
  61
  62 static void
  63 exec_prepare( const struct sp_fragment_shader_variant *var,
  64               struct tgsi_exec_machine *machine,
  65               struct tgsi_sampler *sampler )
  66 {
  67    /*
  68     * Bind tokens/shader to the interpreter's machine state.
  69     */
  70    tgsi_exec_machine_bind_shader(machine,
  71                                  var->tokens,
  72                                  sampler);
  73 }
  74
  75
  76
  77 /**
  78  * Compute quad X,Y,Z,W for the four fragments in a quad.
  79  *
  80  * This should really be part of the compiled shader.
  81  */
  82 static void
  83 setup_pos_vector(const struct tgsi_interp_coef *coef,
  84                  float x, float y,
  85                  struct tgsi_exec_vector *quadpos)
  86 {
  87    uint chan;
  88    /* do X */
  89    quadpos->xyzw[0].f[0] = x;
  90    quadpos->xyzw[0].f[1] = x + 1;
  91    quadpos->xyzw[0].f[2] = x;
  92    quadpos->xyzw[0].f[3] = x + 1;
  93
  94    /* do Y */
  95    quadpos->xyzw[1].f[0] = y;
  96    quadpos->xyzw[1].f[1] = y;
  97    quadpos->xyzw[1].f[2] = y + 1;
  98    quadpos->xyzw[1].f[3] = y + 1;
  99
 100    /* do Z and W for all fragments in the quad */
 101    for (chan = 2; chan < 4; chan++) {
 102       const float dadx = coef->dadx[chan];
 103       const float dady = coef->dady[chan];
 104       const float a0 = coef->a0[chan] + dadx * x + dady * y;
 105       quadpos->xyzw[chan].f[0] = a0;
 106       quadpos->xyzw[chan].f[1] = a0 + dadx;
 107       quadpos->xyzw[chan].f[2] = a0 + dady;
 108       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
 109    }
 110 }
 111
 112
 113 /* TODO: hide the machine struct in here somewhere, remove from this
 114  * interface:
 115  */
 116 static unsigned
 117 exec_run( const struct sp_fragment_shader_variant *var,
 118           struct tgsi_exec_machine *machine,
 119           struct quad_header *quad )
 120 {
 121    /* Compute X, Y, Z, W vals for this quad */
 122    setup_pos_vector(quad->posCoef,
 123                     (float)quad->input.x0, (float)quad->input.y0,
 124                     &machine->QuadPos);
 125
 126    /* convert 0 to 1.0 and 1 to -1.0 */
 127    machine->Face = (float) (quad->input.facing * -2 + 1);
 128
 129    quad->inout.mask &= tgsi_exec_machine_run( machine );
 130    if (quad->inout.mask == 0)
 131       return FALSE;
 132
 133    /* store outputs */
 134    {
 135       const ubyte *sem_name = var->info.output_semantic_name;
 136       const ubyte *sem_index = var->info.output_semantic_index;
 137       const uint n = var->info.num_outputs;
 138       uint i;
 139       for (i = 0; i < n; i++) {
 140          switch (sem_name[i]) {
 141          case TGSI_SEMANTIC_COLOR:
 142             {
 143                uint cbuf = sem_index[i];
 144
 145                assert(sizeof(quad->output.color[cbuf]) ==
 146                       sizeof(machine->Outputs[i]));
 147
 148                /* copy float[4][4] result */
 149                memcpy(quad->output.color[cbuf],
 150                       &machine->Outputs[i],
 151                       sizeof(quad->output.color[0]) );
 152             }
 153             break;
 154          case TGSI_SEMANTIC_POSITION:
 155             {
 156                uint j;
 157
 158                for (j = 0; j < 4; j++)
 159                   quad->output.depth[j] = machine->Outputs[i].xyzw[2].f[j];
 160             }
 161             break;
 162          case TGSI_SEMANTIC_STENCIL:
 163             {
 164                uint j;
 165
 166                for (j = 0; j < 4; j++)
 167                   quad->output.stencil[j] = (unsigned)machine->Outputs[i].xyzw[1].u[j];
 168             }
 169             break;
 170          }
 171       }
 172    }
 173
 174    return TRUE;
 175 }
 176
 177
 178 static void
 179 exec_delete(struct sp_fragment_shader_variant *var,
 180             struct tgsi_exec_machine *machine)
 181 {
 182    if (machine->Tokens == var->tokens) {
 183       tgsi_exec_machine_bind_shader(machine, NULL, NULL);
 184    }
 185
 186    FREE( (void *) var->tokens );
 187    FREE(var);
 188 }
 189
 190
 191 struct sp_fragment_shader_variant *
 192 softpipe_create_fs_variant_exec(struct softpipe_context *softpipe)
 193 {
 194    struct sp_exec_fragment_shader *shader;
 195
 196    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 197    if (!shader)
 198       return NULL;
 199
 200    shader->base.prepare = exec_prepare;
 201    shader->base.run = exec_run;
 202    shader->base.delete = exec_delete;
 203
 204    return &shader->base;
 205 }