src/gallium/drivers/softpipe/sp_fs_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  * 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
  46  */
  47 struct sp_exec_fragment_shader
  48 {
  49    struct sp_fragment_shader 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 *base)
  57 {
  58    return (struct sp_exec_fragment_shader *) base;
  59 }
  60
  61
  62 /**
  63  * Compute quad X,Y,Z,W for the four fragments in a quad.
  64  *
  65  * This should really be part of the compiled shader.
  66  */
  67 void
  68 sp_setup_pos_vector(const struct tgsi_interp_coef *coef,
  69                     float x, float y,
  70                     struct tgsi_exec_vector *quadpos)
  71 {
  72    uint chan;
  73    /* do X */
  74    quadpos->xyzw[0].f[0] = x;
  75    quadpos->xyzw[0].f[1] = x + 1;
  76    quadpos->xyzw[0].f[2] = x;
  77    quadpos->xyzw[0].f[3] = x + 1;
  78
  79    /* do Y */
  80    quadpos->xyzw[1].f[0] = y;
  81    quadpos->xyzw[1].f[1] = y;
  82    quadpos->xyzw[1].f[2] = y + 1;
  83    quadpos->xyzw[1].f[3] = y + 1;
  84
  85    /* do Z and W for all fragments in the quad */
  86    for (chan = 2; chan < 4; chan++) {
  87       const float dadx = coef->dadx[chan];
  88       const float dady = coef->dady[chan];
  89       const float a0 = coef->a0[chan] + dadx * x + dady * y;
  90       quadpos->xyzw[chan].f[0] = a0;
  91       quadpos->xyzw[chan].f[1] = a0 + dadx;
  92       quadpos->xyzw[chan].f[2] = a0 + dady;
  93       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
  94    }
  95 }
  96
  97
  98 static void
  99 exec_prepare( const struct sp_fragment_shader *base,
 100               struct tgsi_exec_machine *machine,
 101               struct tgsi_sampler **samplers )
 102 {
 103    /*
 104     * Bind tokens/shader to the interpreter's machine state.
 105     * Avoid redundant binding.
 106     */
 107    if (machine->Tokens != base->shader.tokens) {
 108       tgsi_exec_machine_bind_shader( machine,
 109                                      base->shader.tokens,
 110                                      PIPE_MAX_SAMPLERS,
 111                                      samplers );
 112    }
 113 }
 114
 115
 116 /* TODO: hide the machine struct in here somewhere, remove from this
 117  * interface:
 118  */
 119 static unsigned
 120 exec_run( const struct sp_fragment_shader *base,
 121           struct tgsi_exec_machine *machine,
 122           struct quad_header *quad )
 123 {
 124    /* Compute X, Y, Z, W vals for this quad */
 125    sp_setup_pos_vector(quad->posCoef,
 126                        (float)quad->input.x0, (float)quad->input.y0,
 127                        &machine->QuadPos);
 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 = base->info.output_semantic_name;
 136       const ubyte *sem_index = base->info.output_semantic_index;
 137       const uint n = base->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                memcpy(quad->output.color[cbuf],
 145                       &machine->Outputs[i].xyzw[0].f[0],
 146                       sizeof(quad->output.color[0]) );
 147             }
 148             break;
 149          case TGSI_SEMANTIC_POSITION:
 150             {
 151                uint j;
 152                for (j = 0; j < 4; j++) {
 153                   quad->output.depth[j] = machine->Outputs[0].xyzw[2].f[j];
 154                }
 155             }
 156             break;
 157          }
 158       }
 159    }
 160
 161    return TRUE;
 162 }
 163
 164
 165 static void
 166 exec_delete( struct sp_fragment_shader *base )
 167 {
 168    FREE((void *) base->shader.tokens);
 169    FREE(base);
 170 }
 171
 172
 173 struct sp_fragment_shader *
 174 softpipe_create_fs_exec(struct softpipe_context *softpipe,
 175                         const struct pipe_shader_state *templ)
 176 {
 177    struct sp_exec_fragment_shader *shader;
 178
 179    /* Decide whether we'll be codegenerating this shader and if so do
 180     * that now.
 181     */
 182
 183    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 184    if (!shader)
 185       return NULL;
 186
 187    /* we need to keep a local copy of the tokens */
 188    shader->base.shader.tokens = tgsi_dup_tokens(templ->tokens);
 189    shader->base.prepare = exec_prepare;
 190    shader->base.run = exec_run;
 191    shader->base.delete = exec_delete;
 192
 193    return &shader->base;
 194 }