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 static void
  63 exec_prepare( const struct sp_fragment_shader *base,
  64               struct tgsi_exec_machine *machine,
  65               struct tgsi_sampler **samplers )
  66 {
  67    /*
  68     * Bind tokens/shader to the interpreter's machine state.
  69     * Avoid redundant binding.
  70     */
  71    if (machine->Tokens != base->shader.tokens) {
  72       tgsi_exec_machine_bind_shader( machine,
  73                                      base->shader.tokens,
  74                                      PIPE_MAX_SAMPLERS,
  75                                      samplers );
  76    }
  77 }
  78
  79
  80
  81 /**
  82  * Compute quad X,Y,Z,W for the four fragments in a quad.
  83  *
  84  * This should really be part of the compiled shader.
  85  */
  86 static void
  87 setup_pos_vector(const struct tgsi_interp_coef *coef,
  88                  float x, float y,
  89                  struct tgsi_exec_vector *quadpos)
  90 {
  91    uint chan;
  92    /* do X */
  93    quadpos->xyzw[0].f[0] = x;
  94    quadpos->xyzw[0].f[1] = x + 1;
  95    quadpos->xyzw[0].f[2] = x;
  96    quadpos->xyzw[0].f[3] = x + 1;
  97
  98    /* do Y */
  99    quadpos->xyzw[1].f[0] = y;
 100    quadpos->xyzw[1].f[1] = y;
 101    quadpos->xyzw[1].f[2] = y + 1;
 102    quadpos->xyzw[1].f[3] = y + 1;
 103
 104    /* do Z and W for all fragments in the quad */
 105    for (chan = 2; chan < 4; chan++) {
 106       const float dadx = coef->dadx[chan];
 107       const float dady = coef->dady[chan];
 108       const float a0 = coef->a0[chan] + dadx * x + dady * y;
 109       quadpos->xyzw[chan].f[0] = a0;
 110       quadpos->xyzw[chan].f[1] = a0 + dadx;
 111       quadpos->xyzw[chan].f[2] = a0 + dady;
 112       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
 113    }
 114 }
 115
 116
 117 /* TODO: hide the machine struct in here somewhere, remove from this
 118  * interface:
 119  */
 120 static unsigned
 121 exec_run( const struct sp_fragment_shader *base,
 122           struct tgsi_exec_machine *machine,
 123           struct quad_header *quad )
 124 {
 125    /* Compute X, Y, Z, W vals for this quad */
 126    setup_pos_vector(quad->posCoef,
 127                     (float)quad->input.x0, (float)quad->input.y0,
 128                     &machine->QuadPos);
 129
 130    if (quad->input.facing) {
 131       machine->Face = -1.0f;
 132    } else {
 133       machine->Face = 1.0f;
 134    }
 135
 136    quad->inout.mask &= tgsi_exec_machine_run( machine );
 137    if (quad->inout.mask == 0)
 138       return FALSE;
 139
 140    /* store outputs */
 141    {
 142       const ubyte *sem_name = base->info.output_semantic_name;
 143       const ubyte *sem_index = base->info.output_semantic_index;
 144       const uint n = base->info.num_outputs;
 145       uint i;
 146       for (i = 0; i < n; i++) {
 147          switch (sem_name[i]) {
 148          case TGSI_SEMANTIC_COLOR:
 149             {
 150                uint cbuf = sem_index[i];
 151                memcpy(quad->output.color[cbuf],
 152                       &machine->Outputs[i].xyzw[0].f[0],
 153                       sizeof(quad->output.color[0]) );
 154             }
 155             break;
 156          case TGSI_SEMANTIC_POSITION:
 157             {
 158                uint j;
 159                for (j = 0; j < 4; j++) {
 160                   quad->output.depth[j] = machine->Outputs[i].xyzw[2].f[j];
 161                }
 162             }
 163             break;
 164          }
 165       }
 166    }
 167
 168    return TRUE;
 169 }
 170
 171
 172 static void
 173 exec_delete( struct sp_fragment_shader *base )
 174 {
 175    FREE((void *) base->shader.tokens);
 176    FREE(base);
 177 }
 178
 179
 180 struct sp_fragment_shader *
 181 softpipe_create_fs_exec(struct softpipe_context *softpipe,
 182                         const struct pipe_shader_state *templ)
 183 {
 184    struct sp_exec_fragment_shader *shader;
 185
 186    /* Decide whether we'll be codegenerating this shader and if so do
 187     * that now.
 188     */
 189
 190    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 191    if (!shader)
 192       return NULL;
 193
 194    /* we need to keep a local copy of the tokens */
 195    shader->base.shader.tokens = tgsi_dup_tokens(templ->tokens);
 196    shader->base.prepare = exec_prepare;
 197    shader->base.run = exec_run;
 198    shader->base.delete = exec_delete;
 199
 200    return &shader->base;
 201 }