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