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 "util/u_memory.h"
  38 #include "pipe/p_inlines.h"
  39 #include "tgsi/tgsi_exec.h"
  40 #include "tgsi/tgsi_parse.h"
  41
  42 struct sp_exec_fragment_shader
  43 {
  44    struct sp_fragment_shader base;
  45 };
  46
  47
  48 /** cast wrapper */
  49 static INLINE struct sp_exec_fragment_shader *
  50 sp_exec_fragment_shader(const struct sp_fragment_shader *base)
  51 {
  52    return (struct sp_exec_fragment_shader *) base;
  53 }
  54
  55
  56 /**
  57  * Compute quad X,Y,Z,W for the four fragments in a quad.
  58  *
  59  * This should really be part of the compiled shader.
  60  */
  61 void
  62 sp_setup_pos_vector(const struct tgsi_interp_coef *coef,
  63                     float x, float y,
  64                     struct tgsi_exec_vector *quadpos)
  65 {
  66    uint chan;
  67    /* do X */
  68    quadpos->xyzw[0].f[0] = x;
  69    quadpos->xyzw[0].f[1] = x + 1;
  70    quadpos->xyzw[0].f[2] = x;
  71    quadpos->xyzw[0].f[3] = x + 1;
  72
  73    /* do Y */
  74    quadpos->xyzw[1].f[0] = y;
  75    quadpos->xyzw[1].f[1] = y;
  76    quadpos->xyzw[1].f[2] = y + 1;
  77    quadpos->xyzw[1].f[3] = y + 1;
  78
  79    /* do Z and W for all fragments in the quad */
  80    for (chan = 2; chan < 4; chan++) {
  81       const float dadx = coef->dadx[chan];
  82       const float dady = coef->dady[chan];
  83       const float a0 = coef->a0[chan] + dadx * x + dady * y;
  84       quadpos->xyzw[chan].f[0] = a0;
  85       quadpos->xyzw[chan].f[1] = a0 + dadx;
  86       quadpos->xyzw[chan].f[2] = a0 + dady;
  87       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
  88    }
  89 }
  90
  91
  92 static void
  93 exec_prepare( const struct sp_fragment_shader *base,
  94               struct tgsi_exec_machine *machine,
  95               struct tgsi_sampler **samplers )
  96 {
  97    /*
  98     * Bind tokens/shader to the interpreter's machine state.
  99     * Avoid redundant binding.
 100     */
 101    if (machine->Tokens != base->shader.tokens) {
 102       tgsi_exec_machine_bind_shader( machine,
 103                                      base->shader.tokens,
 104                                      PIPE_MAX_SAMPLERS,
 105                                      samplers );
 106    }
 107 }
 108
 109
 110
 111
 112 /* TODO: hide the machine struct in here somewhere, remove from this
 113  * interface:
 114  */
 115 static unsigned
 116 exec_run( const struct sp_fragment_shader *base,
 117           struct tgsi_exec_machine *machine,
 118           struct quad_header *quad )
 119 {
 120
 121    /* Compute X, Y, Z, W vals for this quad */
 122    sp_setup_pos_vector(quad->posCoef,
 123                        (float)quad->input.x0, (float)quad->input.y0,
 124                        &machine->QuadPos);
 125
 126    return tgsi_exec_machine_run( machine );
 127 }
 128
 129
 130
 131 static void
 132 exec_delete( struct sp_fragment_shader *base )
 133 {
 134    FREE((void *) base->shader.tokens);
 135    FREE(base);
 136 }
 137
 138
 139
 140
 141
 142 struct sp_fragment_shader *
 143 softpipe_create_fs_exec(struct softpipe_context *softpipe,
 144                         const struct pipe_shader_state *templ)
 145 {
 146    struct sp_exec_fragment_shader *shader;
 147
 148    /* Decide whether we'll be codegenerating this shader and if so do
 149     * that now.
 150     */
 151
 152    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 153    if (!shader)
 154       return NULL;
 155
 156    /* we need to keep a local copy of the tokens */
 157    shader->base.shader.tokens = tgsi_dup_tokens(templ->tokens);
 158    shader->base.prepare = exec_prepare;
 159    shader->base.run = exec_run;
 160    shader->base.delete = exec_delete;
 161
 162    return &shader->base;
 163 }
 164