src/gallium/auxiliary/util/u_simple_shaders.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  * Copyright 2009 Marek Olšák <maraeo@gmail.com>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 /**
  30  * @file
  31  * Simple vertex/fragment shader generators.
  32  *
  33  * @author Brian Paul
  34            Marek Olšák
  35  */
  36
  37
  38 #include "pipe/p_context.h"
  39 #include "pipe/p_shader_tokens.h"
  40 #include "util/u_simple_shaders.h"
  41 #include "tgsi/tgsi_ureg.h"
  42
  43
  44
  45 /**
  46  * Make simple vertex pass-through shader.
  47  */
  48 void *
  49 util_make_vertex_passthrough_shader(struct pipe_context *pipe,
  50                                     uint num_attribs,
  51                                     const uint *semantic_names,
  52                                     const uint *semantic_indexes)
  53
  54 {
  55    struct ureg_program *ureg;
  56    uint i;
  57
  58    ureg = ureg_create( TGSI_PROCESSOR_VERTEX );
  59    if (ureg == NULL)
  60       return NULL;
  61
  62    for (i = 0; i < num_attribs; i++) {
  63       struct ureg_src src;
  64       struct ureg_dst dst;
  65
  66       src = ureg_DECL_vs_input( ureg, i );
  67
  68       dst = ureg_DECL_output( ureg,
  69                               semantic_names[i],
  70                               semantic_indexes[i]);
  71
  72       ureg_MOV( ureg, dst, src );
  73    }
  74
  75    ureg_END( ureg );
  76
  77    return ureg_create_shader_and_destroy( ureg, pipe );
  78 }
  79
  80
  81
  82
  83 /**
  84  * Make simple fragment texture shader:
  85  *  IMM {0,0,0,1}                         // (if writemask != 0xf)
  86  *  MOV OUT[0], IMM[0]                    // (if writemask != 0xf)
  87  *  TEX OUT[0].writemask, IN[0], SAMP[0], 2D;
  88  *  END;
  89  */
  90 void *
  91 util_make_fragment_tex_shader_writemask(struct pipe_context *pipe,
  92                                         unsigned tex_target,
  93                                         unsigned writemask )
  94 {
  95    struct ureg_program *ureg;
  96    struct ureg_src sampler;
  97    struct ureg_src tex;
  98    struct ureg_dst out;
  99
 100    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 101    if (ureg == NULL)
 102       return NULL;
 103
 104    sampler = ureg_DECL_sampler( ureg, 0 );
 105
 106    tex = ureg_DECL_fs_input( ureg,
 107                              TGSI_SEMANTIC_GENERIC, 0,
 108                              TGSI_INTERPOLATE_PERSPECTIVE );
 109
 110    out = ureg_DECL_output( ureg,
 111                            TGSI_SEMANTIC_COLOR,
 112                            0 );
 113
 114    if (writemask != TGSI_WRITEMASK_XYZW) {
 115       struct ureg_src imm = ureg_imm4f( ureg, 0, 0, 0, 1 );
 116
 117       ureg_MOV( ureg, out, imm );
 118    }
 119
 120    ureg_TEX( ureg,
 121              ureg_writemask(out, writemask),
 122              tex_target, tex, sampler );
 123    ureg_END( ureg );
 124
 125    return ureg_create_shader_and_destroy( ureg, pipe );
 126 }
 127
 128 void *
 129 util_make_fragment_tex_shader(struct pipe_context *pipe, unsigned tex_target )
 130 {
 131    return util_make_fragment_tex_shader_writemask( pipe,
 132                                                    tex_target,
 133                                                    TGSI_WRITEMASK_XYZW );
 134 }
 135
 136 /**
 137  * Make a simple fragment texture shader which reads an X component from
 138  * a texture and writes it as depth.
 139  */
 140 void *
 141 util_make_fragment_tex_shader_writedepth(struct pipe_context *pipe,
 142                                          unsigned tex_target)
 143 {
 144    struct ureg_program *ureg;
 145    struct ureg_src sampler;
 146    struct ureg_src tex;
 147    struct ureg_dst out, depth;
 148    struct ureg_src imm;
 149
 150    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 151    if (ureg == NULL)
 152       return NULL;
 153
 154    sampler = ureg_DECL_sampler( ureg, 0 );
 155
 156    tex = ureg_DECL_fs_input( ureg,
 157                              TGSI_SEMANTIC_GENERIC, 0,
 158                              TGSI_INTERPOLATE_PERSPECTIVE );
 159
 160    out = ureg_DECL_output( ureg,
 161                            TGSI_SEMANTIC_COLOR,
 162                            0 );
 163
 164    depth = ureg_DECL_output( ureg,
 165                              TGSI_SEMANTIC_POSITION,
 166                              0 );
 167
 168    imm = ureg_imm4f( ureg, 0, 0, 0, 1 );
 169
 170    ureg_MOV( ureg, out, imm );
 171
 172    ureg_TEX( ureg,
 173              ureg_writemask(depth, TGSI_WRITEMASK_Z),
 174              tex_target, tex, sampler );
 175    ureg_END( ureg );
 176
 177    return ureg_create_shader_and_destroy( ureg, pipe );
 178 }
 179
 180 /**
 181  * Make simple fragment color pass-through shader.
 182  */
 183 void *
 184 util_make_fragment_passthrough_shader(struct pipe_context *pipe)
 185 {
 186    return util_make_fragment_clonecolor_shader(pipe, 1);
 187 }
 188
 189 void *
 190 util_make_fragment_clonecolor_shader(struct pipe_context *pipe, int num_cbufs)
 191 {
 192    struct ureg_program *ureg;
 193    struct ureg_src src;
 194    struct ureg_dst dst[8];
 195    int i;
 196
 197    assert(num_cbufs <= 8);
 198
 199    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 200    if (ureg == NULL)
 201       return NULL;
 202
 203    src = ureg_DECL_fs_input( ureg, TGSI_SEMANTIC_COLOR, 0,
 204                              TGSI_INTERPOLATE_PERSPECTIVE );
 205
 206    for (i = 0; i < num_cbufs; i++)
 207       dst[i] = ureg_DECL_output( ureg, TGSI_SEMANTIC_COLOR, i );
 208
 209    for (i = 0; i < num_cbufs; i++)
 210       ureg_MOV( ureg, dst[i], src );
 211
 212    ureg_END( ureg );
 213
 214    return ureg_create_shader_and_destroy( ureg, pipe );
 215 }