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 #include "sp_context.h"
  30 #include "sp_state.h"
  31 #include "sp_fs.h"
  32 #include "sp_headers.h"
  33
  34
  35 #include "pipe/p_state.h"
  36 #include "pipe/p_defines.h"
  37 #include "pipe/p_util.h"
  38 #include "pipe/p_inlines.h"
  39 #include "tgsi/exec/tgsi_exec.h"
  40 #include "tgsi/util/tgsi_parse.h"
  41
  42 struct sp_exec_fragment_shader {
  43    struct sp_fragment_shader base;
  44 };
  45
  46
  47
  48 /**
  49  * Compute quad X,Y,Z,W for the four fragments in a quad.
  50  *
  51  * This should really be part of the compiled shader.
  52  */
  53 void
  54 sp_setup_pos_vector(const struct tgsi_interp_coef *coef,
  55                     float x, float y,
  56                     struct tgsi_exec_vector *quadpos)
  57 {
  58    uint chan;
  59    /* do X */
  60    quadpos->xyzw[0].f[0] = x;
  61    quadpos->xyzw[0].f[1] = x + 1;
  62    quadpos->xyzw[0].f[2] = x;
  63    quadpos->xyzw[0].f[3] = x + 1;
  64
  65    /* do Y */
  66    quadpos->xyzw[1].f[0] = y;
  67    quadpos->xyzw[1].f[1] = y;
  68    quadpos->xyzw[1].f[2] = y + 1;
  69    quadpos->xyzw[1].f[3] = y + 1;
  70
  71    /* do Z and W for all fragments in the quad */
  72    for (chan = 2; chan < 4; chan++) {
  73       const float dadx = coef->dadx[chan];
  74       const float dady = coef->dady[chan];
  75       const float a0 = coef->a0[chan] + dadx * x + dady * y;
  76       quadpos->xyzw[chan].f[0] = a0;
  77       quadpos->xyzw[chan].f[1] = a0 + dadx;
  78       quadpos->xyzw[chan].f[2] = a0 + dady;
  79       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
  80    }
  81 }
  82
  83
  84 static void
  85 exec_prepare( const struct sp_fragment_shader *base,
  86               struct tgsi_exec_machine *machine,
  87               struct tgsi_sampler *samplers )
  88 {
  89    tgsi_exec_machine_bind_shader( machine,
  90                                   base->shader.tokens,
  91                                   PIPE_MAX_SAMPLERS,
  92                                   samplers );
  93 }
  94
  95
  96
  97
  98 /* TODO: hide the machine struct in here somewhere, remove from this
  99  * interface:
 100  */
 101 static unsigned
 102 exec_run( const struct sp_fragment_shader *base,
 103           struct tgsi_exec_machine *machine,
 104           struct quad_header *quad )
 105 {
 106
 107    /* Compute X, Y, Z, W vals for this quad */
 108    sp_setup_pos_vector(quad->posCoef,
 109                        (float)quad->x0, (float)quad->y0,
 110                        &machine->QuadPos);
 111
 112    return tgsi_exec_machine_run( machine );
 113 }
 114
 115
 116
 117 static void
 118 exec_delete( struct sp_fragment_shader *base )
 119 {
 120    FREE((void *) base->shader.tokens);
 121    FREE(base);
 122 }
 123
 124
 125
 126
 127
 128 struct sp_fragment_shader *
 129 softpipe_create_fs_exec(struct softpipe_context *softpipe,
 130                         const struct pipe_shader_state *templ)
 131 {
 132    struct sp_exec_fragment_shader *shader;
 133
 134    /* Decide whether we'll be codegenerating this shader and if so do
 135     * that now.
 136     */
 137
 138    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 139    if (!shader)
 140       return NULL;
 141
 142    /* we need to keep a local copy of the tokens */
 143    shader->base.shader.tokens = tgsi_dup_tokens(templ->tokens);
 144    shader->base.prepare = exec_prepare;
 145    shader->base.run = exec_run;
 146    shader->base.delete = exec_delete;
 147
 148    return &shader->base;
 149 }
 150