gl/mesa/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    return util_make_vertex_passthrough_shader_with_so(pipe, num_attribs,
  60                                                       semantic_names,
  61                                                       semantic_indexes, NULL);
  62 }
  63
  64 void *
  65 util_make_vertex_passthrough_shader_with_so(struct pipe_context *pipe,
  66                                     uint num_attribs,
  67                                     const uint *semantic_names,
  68                                     const uint *semantic_indexes,
  69                                     const struct pipe_stream_output_info *so)
  70 {
  71    struct ureg_program *ureg;
  72    uint i;
  73
  74    ureg = ureg_create( TGSI_PROCESSOR_VERTEX );
  75    if (ureg == NULL)
  76       return NULL;
  77
  78    for (i = 0; i < num_attribs; i++) {
  79       struct ureg_src src;
  80       struct ureg_dst dst;
  81
  82       src = ureg_DECL_vs_input( ureg, i );
  83
  84       dst = ureg_DECL_output( ureg,
  85                               semantic_names[i],
  86                               semantic_indexes[i]);
  87
  88       ureg_MOV( ureg, dst, src );
  89    }
  90
  91    ureg_END( ureg );
  92
  93    return ureg_create_shader_with_so_and_destroy( ureg, pipe, so );
  94 }
  95
  96
  97 /**
  98  * Make simple fragment texture shader:
  99  *  IMM {0,0,0,1}                         // (if writemask != 0xf)
 100  *  MOV OUT[0], IMM[0]                    // (if writemask != 0xf)
 101  *  TEX OUT[0].writemask, IN[0], SAMP[0], 2D;
 102  *  END;
 103  *
 104  * \param tex_target  one of PIPE_TEXTURE_x
 105  * \parma interp_mode  either TGSI_INTERPOLATE_LINEAR or PERSPECTIVE
 106  * \param writemask  mask of TGSI_WRITEMASK_x
 107  */
 108 void *
 109 util_make_fragment_tex_shader_writemask(struct pipe_context *pipe,
 110                                         unsigned tex_target,
 111                                         unsigned interp_mode,
 112                                         unsigned writemask )
 113 {
 114    struct ureg_program *ureg;
 115    struct ureg_src sampler;
 116    struct ureg_src tex;
 117    struct ureg_dst out;
 118
 119    assert(interp_mode == TGSI_INTERPOLATE_LINEAR ||
 120           interp_mode == TGSI_INTERPOLATE_PERSPECTIVE);
 121
 122    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 123    if (ureg == NULL)
 124       return NULL;
 125
 126    sampler = ureg_DECL_sampler( ureg, 0 );
 127
 128    tex = ureg_DECL_fs_input( ureg,
 129                              TGSI_SEMANTIC_GENERIC, 0,
 130                              interp_mode );
 131
 132    out = ureg_DECL_output( ureg,
 133                            TGSI_SEMANTIC_COLOR,
 134                            0 );
 135
 136    if (writemask != TGSI_WRITEMASK_XYZW) {
 137       struct ureg_src imm = ureg_imm4f( ureg, 0, 0, 0, 1 );
 138
 139       ureg_MOV( ureg, out, imm );
 140    }
 141
 142    ureg_TEX( ureg,
 143              ureg_writemask(out, writemask),
 144              tex_target, tex, sampler );
 145    ureg_END( ureg );
 146
 147    return ureg_create_shader_and_destroy( ureg, pipe );
 148 }
 149
 150
 151 /**
 152  * Make a simple fragment shader that sets the output color to a color
 153  * taken from a texture.
 154  * \param tex_target  one of PIPE_TEXTURE_x
 155  */
 156 void *
 157 util_make_fragment_tex_shader(struct pipe_context *pipe, unsigned tex_target,
 158                               unsigned interp_mode)
 159 {
 160    return util_make_fragment_tex_shader_writemask( pipe,
 161                                                    tex_target,
 162                                                    interp_mode,
 163                                                    TGSI_WRITEMASK_XYZW );
 164 }
 165
 166
 167 /**
 168  * Make a simple fragment texture shader which reads an X component from
 169  * a texture and writes it as depth.
 170  */
 171 void *
 172 util_make_fragment_tex_shader_writedepth(struct pipe_context *pipe,
 173                                          unsigned tex_target,
 174                                          unsigned interp_mode)
 175 {
 176    struct ureg_program *ureg;
 177    struct ureg_src sampler;
 178    struct ureg_src tex;
 179    struct ureg_dst out, depth;
 180    struct ureg_src imm;
 181
 182    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 183    if (ureg == NULL)
 184       return NULL;
 185
 186    sampler = ureg_DECL_sampler( ureg, 0 );
 187
 188    tex = ureg_DECL_fs_input( ureg,
 189                              TGSI_SEMANTIC_GENERIC, 0,
 190                              interp_mode );
 191
 192    out = ureg_DECL_output( ureg,
 193                            TGSI_SEMANTIC_COLOR,
 194                            0 );
 195
 196    depth = ureg_DECL_output( ureg,
 197                              TGSI_SEMANTIC_POSITION,
 198                              0 );
 199
 200    imm = ureg_imm4f( ureg, 0, 0, 0, 1 );
 201
 202    ureg_MOV( ureg, out, imm );
 203
 204    ureg_TEX( ureg,
 205              ureg_writemask(depth, TGSI_WRITEMASK_Z),
 206              tex_target, tex, sampler );
 207    ureg_END( ureg );
 208
 209    return ureg_create_shader_and_destroy( ureg, pipe );
 210 }
 211
 212
 213 /**
 214  * Make simple fragment color pass-through shader.
 215  */
 216 void *
 217 util_make_fragment_passthrough_shader(struct pipe_context *pipe)
 218 {
 219    return util_make_fragment_cloneinput_shader(pipe, 1, TGSI_SEMANTIC_COLOR,
 220                                                TGSI_INTERPOLATE_PERSPECTIVE);
 221 }
 222
 223
 224 /**
 225  * Make a fragment shader that copies the input color to N output colors.
 226  */
 227 void *
 228 util_make_fragment_cloneinput_shader(struct pipe_context *pipe, int num_cbufs,
 229                                      int input_semantic,
 230                                      int input_interpolate)
 231 {
 232    struct ureg_program *ureg;
 233    struct ureg_src src;
 234    struct ureg_dst dst[PIPE_MAX_COLOR_BUFS];
 235    int i;
 236
 237    assert(num_cbufs <= PIPE_MAX_COLOR_BUFS);
 238
 239    ureg = ureg_create( TGSI_PROCESSOR_FRAGMENT );
 240    if (ureg == NULL)
 241       return NULL;
 242
 243    src = ureg_DECL_fs_input( ureg, input_semantic, 0,
 244                              input_interpolate );
 245
 246    for (i = 0; i < num_cbufs; i++)
 247       dst[i] = ureg_DECL_output( ureg, TGSI_SEMANTIC_COLOR, i );
 248
 249    for (i = 0; i < num_cbufs; i++)
 250       ureg_MOV( ureg, dst[i], src );
 251
 252    ureg_END( ureg );
 253
 254    return ureg_create_shader_and_destroy( ureg, pipe );
 255 }