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
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  13  *
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  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
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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               struct tgsi_image *image )
  67 {
  68    /*
  69     * Bind tokens/shader to the interpreter's machine state.
  70     */
  71    tgsi_exec_machine_bind_shader(machine,
  72                                  var->tokens,
  73                                  sampler, image, NULL);
  74 }
  75
  76
  77
  78 /**
  79  * Compute quad X,Y,Z,W for the four fragments in a quad.
  80  *
  81  * This should really be part of the compiled shader.
  82  */
  83 static void
  84 setup_pos_vector(const struct tgsi_interp_coef *coef,
  85                  float x, float y,
  86                  struct tgsi_exec_vector *quadpos)
  87 {
  88    uint chan;
  89    /* do X */
  90    quadpos->xyzw[0].f[0] = x;
  91    quadpos->xyzw[0].f[1] = x + 1;
  92    quadpos->xyzw[0].f[2] = x;
  93    quadpos->xyzw[0].f[3] = x + 1;
  94
  95    /* do Y */
  96    quadpos->xyzw[1].f[0] = y;
  97    quadpos->xyzw[1].f[1] = y;
  98    quadpos->xyzw[1].f[2] = y + 1;
  99    quadpos->xyzw[1].f[3] = y + 1;
 100
 101    /* do Z and W for all fragments in the quad */
 102    for (chan = 2; chan < 4; chan++) {
 103       const float dadx = coef->dadx[chan];
 104       const float dady = coef->dady[chan];
 105       const float a0 = coef->a0[chan] + dadx * x + dady * y;
 106       quadpos->xyzw[chan].f[0] = a0;
 107       quadpos->xyzw[chan].f[1] = a0 + dadx;
 108       quadpos->xyzw[chan].f[2] = a0 + dady;
 109       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
 110    }
 111 }
 112
 113
 114 /* TODO: hide the machine struct in here somewhere, remove from this
 115  * interface:
 116  */
 117 static unsigned
 118 exec_run( const struct sp_fragment_shader_variant *var,
 119           struct tgsi_exec_machine *machine,
 120           struct quad_header *quad,
 121           bool early_depth_test )
 122 {
 123    /* Compute X, Y, Z, W vals for this quad */
 124    setup_pos_vector(quad->posCoef,
 125                     (float)quad->input.x0, (float)quad->input.y0,
 126                     &machine->QuadPos);
 127
 128    /* convert 0 to 1.0 and 1 to -1.0 */
 129    machine->Face = (float) (quad->input.facing * -2 + 1);
 130
 131    machine->NonHelperMask = quad->inout.mask;
 132    quad->inout.mask &= tgsi_exec_machine_run( machine );
 133    if (quad->inout.mask == 0)
 134       return FALSE;
 135
 136    /* store outputs */
 137    {
 138       const ubyte *sem_name = var->info.output_semantic_name;
 139       const ubyte *sem_index = var->info.output_semantic_index;
 140       const uint n = var->info.num_outputs;
 141       uint i;
 142       for (i = 0; i < n; i++) {
 143          switch (sem_name[i]) {
 144          case TGSI_SEMANTIC_COLOR:
 145             {
 146                uint cbuf = sem_index[i];
 147
 148                assert(sizeof(quad->output.color[cbuf]) ==
 149                       sizeof(machine->Outputs[i]));
 150
 151                /* copy float[4][4] result */
 152                memcpy(quad->output.color[cbuf],
 153                       &machine->Outputs[i],
 154                       sizeof(quad->output.color[0]) );
 155             }
 156             break;
 157          case TGSI_SEMANTIC_POSITION:
 158             {
 159                uint j;
 160
 161                if (!early_depth_test) {
 162                   for (j = 0; j < 4; j++)
 163                      quad->output.depth[j] = machine->Outputs[i].xyzw[2].f[j];
 164                }
 165             }
 166             break;
 167          case TGSI_SEMANTIC_STENCIL:
 168             {
 169                uint j;
 170                if (!early_depth_test) {
 171                   for (j = 0; j < 4; j++)
 172                      quad->output.stencil[j] = (unsigned)machine->Outputs[i].xyzw[1].u[j];
 173                }
 174             }
 175             break;
 176          }
 177       }
 178    }
 179
 180    return TRUE;
 181 }
 182
 183
 184 static void
 185 exec_delete(struct sp_fragment_shader_variant *var,
 186             struct tgsi_exec_machine *machine)
 187 {
 188    if (machine->Tokens == var->tokens) {
 189       tgsi_exec_machine_bind_shader(machine, NULL, NULL, NULL, NULL);
 190    }
 191
 192    FREE( (void *) var->tokens );
 193    FREE(var);
 194 }
 195
 196
 197 struct sp_fragment_shader_variant *
 198 softpipe_create_fs_variant_exec(struct softpipe_context *softpipe)
 199 {
 200    struct sp_exec_fragment_shader *shader;
 201
 202    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 203    if (!shader)
 204       return NULL;
 205
 206    shader->base.prepare = exec_prepare;
 207    shader->base.run = exec_run;
 208    shader->base.delete = exec_delete;
 209
 210    return &shader->base;
 211 }