src/gallium/drivers/softpipe/sp_fs_exec.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 VMware, Inc.
   4  * All Rights Reserved.
   5  *
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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  *
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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               struct tgsi_buffer *buffer )
  68 {
  69    /*
  70     * Bind tokens/shader to the interpreter's machine state.
  71     */
  72    tgsi_exec_machine_bind_shader(machine,
  73                                  var->tokens,
  74                                  sampler, image, buffer);
  75 }
  76
  77
  78
  79 /**
  80  * Compute quad X,Y,Z,W for the four fragments in a quad.
  81  *
  82  * This should really be part of the compiled shader.
  83  */
  84 static void
  85 setup_pos_vector(const struct tgsi_interp_coef *coef,
  86                  float x, float y,
  87                  struct tgsi_exec_vector *quadpos)
  88 {
  89    uint chan;
  90    /* do X */
  91    quadpos->xyzw[0].f[0] = x;
  92    quadpos->xyzw[0].f[1] = x + 1;
  93    quadpos->xyzw[0].f[2] = x;
  94    quadpos->xyzw[0].f[3] = x + 1;
  95
  96    /* do Y */
  97    quadpos->xyzw[1].f[0] = y;
  98    quadpos->xyzw[1].f[1] = y;
  99    quadpos->xyzw[1].f[2] = y + 1;
 100    quadpos->xyzw[1].f[3] = y + 1;
 101
 102    /* do Z and W for all fragments in the quad */
 103    for (chan = 2; chan < 4; chan++) {
 104       const float dadx = coef->dadx[chan];
 105       const float dady = coef->dady[chan];
 106       const float a0 = coef->a0[chan] + dadx * x + dady * y;
 107       quadpos->xyzw[chan].f[0] = a0;
 108       quadpos->xyzw[chan].f[1] = a0 + dadx;
 109       quadpos->xyzw[chan].f[2] = a0 + dady;
 110       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
 111    }
 112 }
 113
 114
 115 /* TODO: hide the machine struct in here somewhere, remove from this
 116  * interface:
 117  */
 118 static unsigned
 119 exec_run( const struct sp_fragment_shader_variant *var,
 120           struct tgsi_exec_machine *machine,
 121           struct quad_header *quad,
 122           bool early_depth_test )
 123 {
 124    /* Compute X, Y, Z, W vals for this quad */
 125    setup_pos_vector(quad->posCoef,
 126                     (float)quad->input.x0, (float)quad->input.y0,
 127                     &machine->QuadPos);
 128
 129    /* convert 0 to 1.0 and 1 to -1.0 */
 130    machine->Face = (float) (quad->input.facing * -2 + 1);
 131
 132    machine->NonHelperMask = quad->inout.mask;
 133    quad->inout.mask &= tgsi_exec_machine_run( machine );
 134    if (quad->inout.mask == 0)
 135       return FALSE;
 136
 137    /* store outputs */
 138    {
 139       const ubyte *sem_name = var->info.output_semantic_name;
 140       const ubyte *sem_index = var->info.output_semantic_index;
 141       const uint n = var->info.num_outputs;
 142       uint i;
 143       for (i = 0; i < n; i++) {
 144          switch (sem_name[i]) {
 145          case TGSI_SEMANTIC_COLOR:
 146             {
 147                uint cbuf = sem_index[i];
 148
 149                assert(sizeof(quad->output.color[cbuf]) ==
 150                       sizeof(machine->Outputs[i]));
 151
 152                /* copy float[4][4] result */
 153                memcpy(quad->output.color[cbuf],
 154                       &machine->Outputs[i],
 155                       sizeof(quad->output.color[0]) );
 156             }
 157             break;
 158          case TGSI_SEMANTIC_POSITION:
 159             {
 160                uint j;
 161
 162                if (!early_depth_test) {
 163                   for (j = 0; j < 4; j++)
 164                      quad->output.depth[j] = machine->Outputs[i].xyzw[2].f[j];
 165                }
 166             }
 167             break;
 168          case TGSI_SEMANTIC_STENCIL:
 169             {
 170                uint j;
 171                if (!early_depth_test) {
 172                   for (j = 0; j < 4; j++)
 173                      quad->output.stencil[j] = (unsigned)machine->Outputs[i].xyzw[1].u[j];
 174                }
 175             }
 176             break;
 177          }
 178       }
 179    }
 180
 181    return TRUE;
 182 }
 183
 184
 185 static void
 186 exec_delete(struct sp_fragment_shader_variant *var,
 187             struct tgsi_exec_machine *machine)
 188 {
 189    if (machine->Tokens == var->tokens) {
 190       tgsi_exec_machine_bind_shader(machine, NULL, NULL, NULL, NULL);
 191    }
 192
 193    FREE( (void *) var->tokens );
 194    FREE(var);
 195 }
 196
 197
 198 struct sp_fragment_shader_variant *
 199 softpipe_create_fs_variant_exec(struct softpipe_context *softpipe)
 200 {
 201    struct sp_exec_fragment_shader *shader;
 202
 203    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 204    if (!shader)
 205       return NULL;
 206
 207    shader->base.prepare = exec_prepare;
 208    shader->base.run = exec_run;
 209    shader->base.delete = exec_delete;
 210
 211    return &shader->base;
 212 }