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    const struct tgsi_token *machine_tokens;
  46 };
  47
  48
  49 /** cast wrapper */
  50 static INLINE struct sp_exec_fragment_shader *
  51 sp_exec_fragment_shader(const struct sp_fragment_shader *base)
  52 {
  53    return (struct sp_exec_fragment_shader *) base;
  54 }
  55
  56
  57 /**
  58  * Compute quad X,Y,Z,W for the four fragments in a quad.
  59  *
  60  * This should really be part of the compiled shader.
  61  */
  62 void
  63 sp_setup_pos_vector(const struct tgsi_interp_coef *coef,
  64                     float x, float y,
  65                     struct tgsi_exec_vector *quadpos)
  66 {
  67    uint chan;
  68    /* do X */
  69    quadpos->xyzw[0].f[0] = x;
  70    quadpos->xyzw[0].f[1] = x + 1;
  71    quadpos->xyzw[0].f[2] = x;
  72    quadpos->xyzw[0].f[3] = x + 1;
  73
  74    /* do Y */
  75    quadpos->xyzw[1].f[0] = y;
  76    quadpos->xyzw[1].f[1] = y;
  77    quadpos->xyzw[1].f[2] = y + 1;
  78    quadpos->xyzw[1].f[3] = y + 1;
  79
  80    /* do Z and W for all fragments in the quad */
  81    for (chan = 2; chan < 4; chan++) {
  82       const float dadx = coef->dadx[chan];
  83       const float dady = coef->dady[chan];
  84       const float a0 = coef->a0[chan] + dadx * x + dady * y;
  85       quadpos->xyzw[chan].f[0] = a0;
  86       quadpos->xyzw[chan].f[1] = a0 + dadx;
  87       quadpos->xyzw[chan].f[2] = a0 + dady;
  88       quadpos->xyzw[chan].f[3] = a0 + dadx + dady;
  89    }
  90 }
  91
  92
  93 static void
  94 exec_prepare( const struct sp_fragment_shader *base,
  95               struct tgsi_exec_machine *machine,
  96               struct tgsi_sampler *samplers )
  97 {
  98    struct sp_exec_fragment_shader *spefs =
  99       sp_exec_fragment_shader(base);
 100
 101    /*
 102     * Bind tokens/shader to the interpreter's machine state.
 103     * Avoid redundant binding.
 104     */
 105    if (spefs->machine_tokens != base->shader.tokens) {
 106       tgsi_exec_machine_bind_shader( machine,
 107                                      base->shader.tokens,
 108                                      PIPE_MAX_SAMPLERS,
 109                                      samplers );
 110       spefs->machine_tokens = base->shader.tokens;
 111    }
 112 }
 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
 126    /* Compute X, Y, Z, W vals for this quad */
 127    sp_setup_pos_vector(quad->posCoef,
 128                        (float)quad->input.x0, (float)quad->input.y0,
 129                        &machine->QuadPos);
 130
 131    return tgsi_exec_machine_run( machine );
 132 }
 133
 134
 135
 136 static void
 137 exec_delete( struct sp_fragment_shader *base )
 138 {
 139    FREE((void *) base->shader.tokens);
 140    FREE(base);
 141 }
 142
 143
 144
 145
 146
 147 struct sp_fragment_shader *
 148 softpipe_create_fs_exec(struct softpipe_context *softpipe,
 149                         const struct pipe_shader_state *templ)
 150 {
 151    struct sp_exec_fragment_shader *shader;
 152
 153    /* Decide whether we'll be codegenerating this shader and if so do
 154     * that now.
 155     */
 156
 157    shader = CALLOC_STRUCT(sp_exec_fragment_shader);
 158    if (!shader)
 159       return NULL;
 160
 161    /* we need to keep a local copy of the tokens */
 162    shader->base.shader.tokens = tgsi_dup_tokens(templ->tokens);
 163    shader->base.prepare = exec_prepare;
 164    shader->base.run = exec_run;
 165    shader->base.delete = exec_delete;
 166
 167    return &shader->base;
 168 }
 169