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