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  * \param num_attribs  number of attributes to pass through
  48  * \param semantic_names  array of semantic names for each attribute
  49  * \param semantic_indexes  array of semantic indexes for each attribute
  50  */
  51 void *
  52 util_make_vertex_passthrough_shader(struct pipe_context *pipe,
  53                                     uint num_attribs,
  54                                     const uint *semantic_names,
  55                                     const uint *semantic_indexes)
  56 {
  57    struct ureg_program *ureg;
  58    uint i;
  59
  60    ureg = ureg_create( TGSI_PROCESSOR_VERTEX );
  61    if (ureg == NULL)
  62       return NULL;
  63
  64    for (i = 0; i < num_attribs; i++) {
  65       struct ureg_src src;
  66       struct ureg_dst dst;
  67
  68       src = ureg_DECL_vs_input( ureg, i );
  69
  70       dst = ureg_DECL_output( ureg,
  71                               semantic_names[i],
  72                               semantic_indexes[i]);
  73
  74       ureg_MOV( ureg, dst, src );
  75    }
  76
  77    ureg_END( ureg );
  78
  79    return ureg_create_shader_and_destroy( ureg, pipe );
  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
 129 /**
 130  * Make a simple fragment shader that sets the output color to a color
 131  * taken from a texture.
 132  * \param tex_target  one of PIPE_TEXTURE_x
 133  */
 134 void *
 135 util_make_fragment_tex_shader(struct pipe_context *pipe, unsigned tex_target )
 136 {
 137    return util_make_fragment_tex_shader_writemask( pipe,
 138                                                    tex_target,
 139                                                    TGSI_WRITEMASK_XYZW );
 140 }
 141
 142
 143 /**
 144  * Make a simple fragment texture shader which reads an X component from
 145  * a texture and writes it as depth.
 146  */
 147 void *
 148 util_make_fragment_tex_shader_writedepth(struct pipe_context *pipe,
 149                                          unsigned tex_target)
 150 {
 151    struct ureg_program *ureg;
 152    struct ureg_src sampler;
 153    struct ureg_src tex;
 154    struct ureg_dst out, depth;
 155    struct ureg_src imm;
 156
 157    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 158    if (ureg == NULL)
 159       return NULL;
 160
 161    sampler = ureg_DECL_sampler( ureg, 0 );
 162
 163    tex = ureg_DECL_fs_input( ureg,
 164                              TGSI_SEMANTIC_GENERIC, 0,
 165                              TGSI_INTERPOLATE_PERSPECTIVE );
 166
 167    out = ureg_DECL_output( ureg,
 168                            TGSI_SEMANTIC_COLOR,
 169                            0 );
 170
 171    depth = ureg_DECL_output( ureg,
 172                              TGSI_SEMANTIC_POSITION,
 173                              0 );
 174
 175    imm = ureg_imm4f( ureg, 0, 0, 0, 1 );
 176
 177    ureg_MOV( ureg, out, imm );
 178
 179    ureg_TEX( ureg,
 180              ureg_writemask(depth, TGSI_WRITEMASK_Z),
 181              tex_target, tex, sampler );
 182    ureg_END( ureg );
 183
 184    return ureg_create_shader_and_destroy( ureg, pipe );
 185 }
 186
 187
 188 /**
 189  * Make simple fragment color pass-through shader.
 190  */
 191 void *
 192 util_make_fragment_passthrough_shader(struct pipe_context *pipe)
 193 {
 194    return util_make_fragment_clonecolor_shader(pipe, 1);
 195 }
 196
 197
 198 /**
 199  * Make a fragment shader that copies the input color to N output colors.
 200  */
 201 void *
 202 util_make_fragment_clonecolor_shader(struct pipe_context *pipe, int num_cbufs)
 203 {
 204    struct ureg_program *ureg;
 205    struct ureg_src src;
 206    struct ureg_dst dst[PIPE_MAX_COLOR_BUFS];
 207    int i;
 208
 209    assert(num_cbufs <= PIPE_MAX_COLOR_BUFS);
 210
 211    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 212    if (ureg == NULL)
 213       return NULL;
 214
 215    src = ureg_DECL_fs_input( ureg, TGSI_SEMANTIC_COLOR, 0,
 216                              TGSI_INTERPOLATE_PERSPECTIVE );
 217
 218    for (i = 0; i < num_cbufs; i++)
 219       dst[i] = ureg_DECL_output( ureg, TGSI_SEMANTIC_COLOR, i );
 220
 221    for (i = 0; i < num_cbufs; i++)
 222       ureg_MOV( ureg, dst[i], src );
 223
 224    ureg_END( ureg );
 225
 226    return ureg_create_shader_and_destroy( ureg, pipe );
 227 }