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 "pipe/p_state.h"
  41 #include "util/u_simple_shaders.h"
  42 #include "util/u_debug.h"
  43 #include "tgsi/tgsi_ureg.h"
  44
  45
  46
  47 /**
  48  * Make simple vertex pass-through shader.
  49  * \param num_attribs  number of attributes to pass through
  50  * \param semantic_names  array of semantic names for each attribute
  51  * \param semantic_indexes  array of semantic indexes for each attribute
  52  */
  53 void *
  54 util_make_vertex_passthrough_shader(struct pipe_context *pipe,
  55                                     uint num_attribs,
  56                                     const uint *semantic_names,
  57                                     const uint *semantic_indexes)
  58 {
  59    struct ureg_program *ureg;
  60    uint i;
  61
  62    ureg = ureg_create( TGSI_PROCESSOR_VERTEX );
  63    if (ureg == NULL)
  64       return NULL;
  65
  66    for (i = 0; i < num_attribs; i++) {
  67       struct ureg_src src;
  68       struct ureg_dst dst;
  69
  70       src = ureg_DECL_vs_input( ureg, i );
  71
  72       dst = ureg_DECL_output( ureg,
  73                               semantic_names[i],
  74                               semantic_indexes[i]);
  75
  76       ureg_MOV( ureg, dst, src );
  77    }
  78
  79    ureg_END( ureg );
  80
  81    return ureg_create_shader_and_destroy( ureg, pipe );
  82 }
  83
  84
  85 /**
  86  * Make simple fragment texture shader:
  87  *  IMM {0,0,0,1}                         // (if writemask != 0xf)
  88  *  MOV OUT[0], IMM[0]                    // (if writemask != 0xf)
  89  *  TEX OUT[0].writemask, IN[0], SAMP[0], 2D;
  90  *  END;
  91  *
  92  * \param tex_target  one of PIPE_TEXTURE_x
  93  * \parma interp_mode  either TGSI_INTERPOLATE_LINEAR or PERSPECTIVE
  94  * \param writemask  mask of TGSI_WRITEMASK_x
  95  */
  96 void *
  97 util_make_fragment_tex_shader_writemask(struct pipe_context *pipe,
  98                                         unsigned tex_target,
  99                                         unsigned interp_mode,
 100                                         unsigned writemask )
 101 {
 102    struct ureg_program *ureg;
 103    struct ureg_src sampler;
 104    struct ureg_src tex;
 105    struct ureg_dst out;
 106
 107    assert(interp_mode == TGSI_INTERPOLATE_LINEAR ||
 108           interp_mode == TGSI_INTERPOLATE_PERSPECTIVE);
 109
 110    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 111    if (ureg == NULL)
 112       return NULL;
 113
 114    sampler = ureg_DECL_sampler( ureg, 0 );
 115
 116    tex = ureg_DECL_fs_input( ureg,
 117                              TGSI_SEMANTIC_GENERIC, 0,
 118                              interp_mode );
 119
 120    out = ureg_DECL_output( ureg,
 121                            TGSI_SEMANTIC_COLOR,
 122                            0 );
 123
 124    if (writemask != TGSI_WRITEMASK_XYZW) {
 125       struct ureg_src imm = ureg_imm4f( ureg, 0, 0, 0, 1 );
 126
 127       ureg_MOV( ureg, out, imm );
 128    }
 129
 130    ureg_TEX( ureg,
 131              ureg_writemask(out, writemask),
 132              tex_target, tex, sampler );
 133    ureg_END( ureg );
 134
 135    return ureg_create_shader_and_destroy( ureg, pipe );
 136 }
 137
 138
 139 /**
 140  * Make a simple fragment shader that sets the output color to a color
 141  * taken from a texture.
 142  * \param tex_target  one of PIPE_TEXTURE_x
 143  */
 144 void *
 145 util_make_fragment_tex_shader(struct pipe_context *pipe, unsigned tex_target,
 146                               unsigned interp_mode)
 147 {
 148    return util_make_fragment_tex_shader_writemask( pipe,
 149                                                    tex_target,
 150                                                    interp_mode,
 151                                                    TGSI_WRITEMASK_XYZW );
 152 }
 153
 154
 155 /**
 156  * Make a simple fragment texture shader which reads an X component from
 157  * a texture and writes it as depth.
 158  */
 159 void *
 160 util_make_fragment_tex_shader_writedepth(struct pipe_context *pipe,
 161                                          unsigned tex_target,
 162                                          unsigned interp_mode)
 163 {
 164    struct ureg_program *ureg;
 165    struct ureg_src sampler;
 166    struct ureg_src tex;
 167    struct ureg_dst out, depth;
 168    struct ureg_src imm;
 169
 170    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 171    if (ureg == NULL)
 172       return NULL;
 173
 174    sampler = ureg_DECL_sampler( ureg, 0 );
 175
 176    tex = ureg_DECL_fs_input( ureg,
 177                              TGSI_SEMANTIC_GENERIC, 0,
 178                              interp_mode );
 179
 180    out = ureg_DECL_output( ureg,
 181                            TGSI_SEMANTIC_COLOR,
 182                            0 );
 183
 184    depth = ureg_DECL_output( ureg,
 185                              TGSI_SEMANTIC_POSITION,
 186                              0 );
 187
 188    imm = ureg_imm4f( ureg, 0, 0, 0, 1 );
 189
 190    ureg_MOV( ureg, out, imm );
 191
 192    ureg_TEX( ureg,
 193              ureg_writemask(depth, TGSI_WRITEMASK_Z),
 194              tex_target, tex, sampler );
 195    ureg_END( ureg );
 196
 197    return ureg_create_shader_and_destroy( ureg, pipe );
 198 }
 199
 200
 201 /**
 202  * Make simple fragment color pass-through shader.
 203  */
 204 void *
 205 util_make_fragment_passthrough_shader(struct pipe_context *pipe)
 206 {
 207    return util_make_fragment_cloneinput_shader(pipe, 1, TGSI_SEMANTIC_COLOR,
 208                                                TGSI_INTERPOLATE_PERSPECTIVE);
 209 }
 210
 211
 212 /**
 213  * Make a fragment shader that copies the input color to N output colors.
 214  */
 215 void *
 216 util_make_fragment_cloneinput_shader(struct pipe_context *pipe, int num_cbufs,
 217                                      int input_semantic,
 218                                      int input_interpolate)
 219 {
 220    struct ureg_program *ureg;
 221    struct ureg_src src;
 222    struct ureg_dst dst[PIPE_MAX_COLOR_BUFS];
 223    int i;
 224
 225    assert(num_cbufs <= PIPE_MAX_COLOR_BUFS);
 226
 227    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 228    if (ureg == NULL)
 229       return NULL;
 230
 231    src = ureg_DECL_fs_input( ureg, input_semantic, 0,
 232                              input_interpolate );
 233
 234    for (i = 0; i < num_cbufs; i++)
 235       dst[i] = ureg_DECL_output( ureg, TGSI_SEMANTIC_COLOR, i );
 236
 237    for (i = 0; i < num_cbufs; i++)
 238       ureg_MOV( ureg, dst[i], src );
 239
 240    ureg_END( ureg );
 241
 242    return ureg_create_shader_and_destroy( ureg, pipe );
 243 }