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_quad.h"
  33
  34
  35 #include "pipe/p_state.h"
  36 #include "pipe/p_defines.h"
  37 #include "util/u_memory.h"
  38 #include "tgsi/tgsi_exec.h"
  39 #include "tgsi/tgsi_parse.h"
  40
  41 struct sp_exec_fragment_shader
  42 {
  43    struct sp_fragment_shader base;
  44 };
  45
  46
  47 /** cast wrapper */
  48 static INLINE struct sp_exec_fragment_shader *
  49 sp_exec_fragment_shader(const struct sp_fragment_shader *base)
  50 {
  51    return (struct sp_exec_fragment_shader *) base;
  52 }
  53
  54
  55 /**
  56  * Compute quad X,Y,Z,W for the four fragments in a quad.
  57  *
  58  * This should really be part of the compiled shader.
  59  */
  60 void
  61 sp_setup_pos_vector(const struct tgsi_interp_coef *coef,
  62                     float x, float y,
  63                     struct tgsi_exec_vector *quadpos)
  64 {
  65    uint chan;
  66    /* do X */
  67    quadpos->xyzw[0].f[0] = x;
  68    quadpos->xyzw[0].f[1] = x + 1;
  69    quadpos->xyzw[0].f[2] = x;
  70    quadpos->xyzw[0].f[3] = x + 1;
  71
  72    /* do Y */
  73    quadpos->xyzw[1].f[0] = y;
  74    quadpos->xyzw[1].f[1] = y;
  75    quadpos->xyzw[1].f[2] = y + 1;
  76    quadpos->xyzw[1].f[3] = y + 1;
  77
  78    /* do Z and W for all fragments in the quad */
  79    for (chan = 2; chan < 4; chan++) {
  80       const float dadx = coef->dadx[chan];
  81       const float dady = coef->dady[chan];
  82       const float a0 = coef->a0[chan] + dadx * x + dady * y;
  83       quadpos->xyzw[chan].f[0] = a0;
  84       quadpos->xyzw[chan].f[1] = a0 + dadx;
  85       quadpos->xyzw[chan].f[2] = a0 + dady;
  86       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
  87    }
  88 }
  89
  90
  91 static void
  92 exec_prepare( const struct sp_fragment_shader *base,
  93               struct tgsi_exec_machine *machine,
  94               struct tgsi_sampler **samplers )
  95 {
  96    /*
  97     * Bind tokens/shader to the interpreter's machine state.
  98     * Avoid redundant binding.
  99     */
 100    if (machine->Tokens != base->shader.tokens) {
 101       tgsi_exec_machine_bind_shader( machine,
 102                                      base->shader.tokens,
 103                                      PIPE_MAX_SAMPLERS,
 104                                      samplers );
 105    }
 106 }
 107
 108
 109
 110
 111 /* TODO: hide the machine struct in here somewhere, remove from this
 112  * interface:
 113  */
 114 static unsigned
 115 exec_run( const struct sp_fragment_shader *base,
 116           struct tgsi_exec_machine *machine,
 117           struct quad_header *quad )
 118 {
 119
 120    /* Compute X, Y, Z, W vals for this quad */
 121    sp_setup_pos_vector(quad->posCoef,
 122                        (float)quad->input.x0, (float)quad->input.y0,
 123                        &machine->QuadPos);
 124
 125    return tgsi_exec_machine_run( machine );
 126 }
 127
 128
 129
 130 static void
 131 exec_delete( struct sp_fragment_shader *base )
 132 {
 133    FREE((void *) base->shader.tokens);
 134    FREE(base);
 135 }
 136
 137
 138
 139
 140
 141 struct sp_fragment_shader *
 142 softpipe_create_fs_exec(struct softpipe_context *softpipe,
 143                         const struct pipe_shader_state *templ)
 144 {
 145    struct sp_exec_fragment_shader *shader;
 146
 147    /* Decide whether we'll be codegenerating this shader and if so do
 148     * that now.
 149     */
 150
 151    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 152    if (!shader)
 153       return NULL;
 154
 155    /* we need to keep a local copy of the tokens */
 156    shader->base.shader.tokens = tgsi_dup_tokens(templ->tokens);
 157    shader->base.prepare = exec_prepare;
 158    shader->base.run = exec_run;
 159    shader->base.delete = exec_delete;
 160
 161    return &shader->base;
 162 }
 163