src/mesa/swrast/s_texfetch.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  * Copyright (c) 2009  VMware, Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 /**
  28  * \file s_texfetch.c
  29  *
  30  * Texel fetch/store functions
  31  *
  32  * \author Gareth Hughes
  33  */
  34
  35
  36 #include "main/errors.h"
  37 #include "main/macros.h"
  38 #include "main/texcompress.h"
  39 #include "main/texcompress_fxt1.h"
  40 #include "main/texcompress_s3tc.h"
  41 #include "main/texcompress_rgtc.h"
  42 #include "main/texcompress_etc.h"
  43 #include "main/teximage.h"
  44 #include "main/samplerobj.h"
  45 #include "s_context.h"
  46 #include "s_texfetch.h"
  47 #include "util/format_rgb9e5.h"
  48 #include "util/format_r11g11b10f.h"
  49 #include "util/format_srgb.h"
  50
  51
  52 /* Texel fetch routines for all supported formats
  53  */
  54 #define DIM 1
  55 #include "s_texfetch_tmp.h"
  56
  57 #define DIM 2
  58 #include "s_texfetch_tmp.h"
  59
  60 #define DIM 3
  61 #include "s_texfetch_tmp.h"
  62
  63
  64 /**
  65  * All compressed texture texel fetching is done though this function.
  66  * Basically just call a core-Mesa texel fetch function.
  67  */
  68 static void
  69 fetch_compressed(const struct swrast_texture_image *swImage,
  70                  GLint i, GLint j, GLint k, GLfloat *texel)
  71 {
  72    /* The FetchCompressedTexel function takes an integer pixel rowstride,
  73     * while the image's rowstride is bytes per row of blocks.
  74     */
  75    GLuint bw, bh;
  76    GLuint texelBytes = _mesa_get_format_bytes(swImage->Base.TexFormat);
  77    _mesa_get_format_block_size(swImage->Base.TexFormat, &bw, &bh);
  78    assert(swImage->RowStride * bw % texelBytes == 0);
  79
  80    swImage->FetchCompressedTexel(swImage->ImageSlices[k],
  81                                  swImage->RowStride * bw / texelBytes,
  82                                  i, j, texel);
  83 }
  84
  85
  86
  87 /**
  88  * Null texel fetch function.
  89  *
  90  * Have to have this so the FetchTexel function pointer is never NULL.
  91  */
  92 static void fetch_null_texelf( const struct swrast_texture_image *texImage,
  93                                GLint i, GLint j, GLint k, GLfloat *texel )
  94 {
  95    (void) texImage; (void) i; (void) j; (void) k;
  96    texel[RCOMP] = 0.0;
  97    texel[GCOMP] = 0.0;
  98    texel[BCOMP] = 0.0;
  99    texel[ACOMP] = 0.0;
 100    _mesa_warning(NULL, "fetch_null_texelf() called!");
 101 }
 102
 103
 104 #define FETCH_FUNCS(NAME)       \
 105    [MESA_FORMAT_ ## NAME] = {   \
 106       fetch_texel_1d_ ## NAME,  \
 107       fetch_texel_2d_ ## NAME,  \
 108       fetch_texel_3d_ ## NAME,  \
 109    }
 110
 111 #define FETCH_COMPRESSED(NAME)  \
 112    [MESA_FORMAT_ ## NAME] = {   \
 113       fetch_compressed,         \
 114       fetch_compressed,         \
 115       fetch_compressed          \
 116    }
 117
 118 /**
 119  * Table to map MESA_FORMAT_ to texel fetch/store funcs.
 120  */
 121 static struct {
 122    FetchTexelFunc Fetch1D;
 123    FetchTexelFunc Fetch2D;
 124    FetchTexelFunc Fetch3D;
 125 }
 126 texfetch_funcs[] =
 127 {
 128    /* Packed unorm formats */
 129    FETCH_FUNCS(A8B8G8R8_UNORM),
 130    FETCH_FUNCS(X8B8G8R8_UNORM),
 131    FETCH_FUNCS(R8G8B8A8_UNORM),
 132    FETCH_FUNCS(R8G8B8X8_UNORM),
 133    FETCH_FUNCS(B8G8R8A8_UNORM),
 134    FETCH_FUNCS(B8G8R8X8_UNORM),
 135    FETCH_FUNCS(A8R8G8B8_UNORM),
 136    FETCH_FUNCS(X8R8G8B8_UNORM),
 137    FETCH_FUNCS(B5G6R5_UNORM),
 138    FETCH_FUNCS(R5G6B5_UNORM),
 139    FETCH_FUNCS(B4G4R4A4_UNORM),
 140    FETCH_FUNCS(A4R4G4B4_UNORM),
 141    FETCH_FUNCS(A1B5G5R5_UNORM),
 142    FETCH_FUNCS(B5G5R5A1_UNORM),
 143    FETCH_FUNCS(A1R5G5B5_UNORM),
 144    FETCH_FUNCS(L4A4_UNORM),
 145    FETCH_FUNCS(B2G3R3_UNORM),
 146    FETCH_FUNCS(B10G10R10A2_UNORM),
 147    FETCH_FUNCS(R10G10B10A2_UNORM),
 148
 149    FETCH_FUNCS(S8_UINT_Z24_UNORM),
 150    [MESA_FORMAT_X8_UINT_Z24_UNORM] = {
 151       fetch_texel_1d_S8_UINT_Z24_UNORM,
 152       fetch_texel_2d_S8_UINT_Z24_UNORM,
 153       fetch_texel_3d_S8_UINT_Z24_UNORM
 154    },
 155    FETCH_FUNCS(Z24_UNORM_S8_UINT),
 156    [MESA_FORMAT_Z24_UNORM_X8_UINT] = {
 157       fetch_texel_1d_Z24_UNORM_S8_UINT,
 158       fetch_texel_2d_Z24_UNORM_S8_UINT,
 159       fetch_texel_3d_Z24_UNORM_S8_UINT
 160    },
 161
 162    FETCH_FUNCS(YCBCR),
 163    FETCH_FUNCS(YCBCR_REV),
 164
 165    /* Array unorm formats */
 166    FETCH_FUNCS(A_UNORM8),
 167    FETCH_FUNCS(A_UNORM16),
 168    FETCH_FUNCS(L_UNORM8),
 169    FETCH_FUNCS(L_UNORM16),
 170    FETCH_FUNCS(LA_UNORM8),
 171    FETCH_FUNCS(LA_UNORM16),
 172    FETCH_FUNCS(I_UNORM8),
 173    FETCH_FUNCS(I_UNORM16),
 174    FETCH_FUNCS(R_UNORM8),
 175    FETCH_FUNCS(R_UNORM16),
 176    FETCH_FUNCS(RG_UNORM8),
 177    FETCH_FUNCS(RG_UNORM16),
 178    FETCH_FUNCS(BGR_UNORM8),
 179    FETCH_FUNCS(RGB_UNORM8),
 180    FETCH_FUNCS(RGBA_UNORM16),
 181    FETCH_FUNCS(RGBX_UNORM16),
 182    FETCH_FUNCS(Z_UNORM16),
 183    FETCH_FUNCS(Z_UNORM32),
 184
 185    /* Packed signed/normalized formats */
 186    FETCH_FUNCS(A8B8G8R8_SNORM),
 187    FETCH_FUNCS(X8B8G8R8_SNORM),
 188    FETCH_FUNCS(R8G8B8A8_SNORM),
 189
 190    /* Array signed/normalized formats */
 191    FETCH_FUNCS(A_SNORM8),
 192    FETCH_FUNCS(A_SNORM16),
 193    FETCH_FUNCS(L_SNORM8),
 194    FETCH_FUNCS(L_SNORM16),
 195    FETCH_FUNCS(LA_SNORM8),
 196    FETCH_FUNCS(LA_SNORM16),
 197    FETCH_FUNCS(I_SNORM8),
 198    FETCH_FUNCS(I_SNORM16),
 199    FETCH_FUNCS(R_SNORM8),
 200    FETCH_FUNCS(R_SNORM16),
 201    FETCH_FUNCS(RG_SNORM8),
 202    FETCH_FUNCS(RG_SNORM16),
 203    FETCH_FUNCS(RGB_SNORM16),
 204    FETCH_FUNCS(RGBA_SNORM16),
 205
 206    /* Packed sRGB formats */
 207    FETCH_FUNCS(A8B8G8R8_SRGB),
 208    FETCH_FUNCS(B8G8R8A8_SRGB),
 209    FETCH_FUNCS(A8R8G8B8_SRGB),
 210    FETCH_FUNCS(R8G8B8A8_SRGB),
 211    FETCH_FUNCS(R8G8B8X8_SRGB),
 212    FETCH_FUNCS(X8B8G8R8_SRGB),
 213
 214    /* Array sRGB formats */
 215    FETCH_FUNCS(R_SRGB8),
 216    FETCH_FUNCS(L_SRGB8),
 217    FETCH_FUNCS(LA_SRGB8),
 218    FETCH_FUNCS(BGR_SRGB8),
 219
 220    /* Packed float formats */
 221    FETCH_FUNCS(R9G9B9E5_FLOAT),
 222    FETCH_FUNCS(R11G11B10_FLOAT),
 223    FETCH_FUNCS(Z32_FLOAT_S8X24_UINT),
 224
 225    /* Array float formats */
 226    FETCH_FUNCS(A_FLOAT16),
 227    FETCH_FUNCS(A_FLOAT32),
 228    FETCH_FUNCS(L_FLOAT16),
 229    FETCH_FUNCS(L_FLOAT32),
 230    FETCH_FUNCS(LA_FLOAT16),
 231    FETCH_FUNCS(LA_FLOAT32),
 232    FETCH_FUNCS(I_FLOAT16),
 233    FETCH_FUNCS(I_FLOAT32),
 234    FETCH_FUNCS(R_FLOAT16),
 235    FETCH_FUNCS(R_FLOAT32),
 236    FETCH_FUNCS(RG_FLOAT16),
 237    FETCH_FUNCS(RG_FLOAT32),
 238    FETCH_FUNCS(RGB_FLOAT16),
 239    FETCH_FUNCS(RGB_FLOAT32),
 240    FETCH_FUNCS(RGBA_FLOAT16),
 241    FETCH_FUNCS(RGBA_FLOAT32),
 242    FETCH_FUNCS(RGBX_FLOAT16),
 243    FETCH_FUNCS(RGBX_FLOAT32),
 244    [MESA_FORMAT_Z_FLOAT32] = {
 245       fetch_texel_1d_R_FLOAT32, /* Reuse the R32F functions. */
 246       fetch_texel_2d_R_FLOAT32,
 247       fetch_texel_3d_R_FLOAT32
 248    },
 249
 250    /* Packed signed/unsigned non-normalized integer formats */
 251
 252    /* Array signed/unsigned non-normalized integer formats */
 253    FETCH_FUNCS(RGBA_UINT16),
 254    FETCH_FUNCS(RGBA_UINT32),
 255    FETCH_FUNCS(RGBA_SINT8),
 256    FETCH_FUNCS(RGBA_SINT16),
 257    FETCH_FUNCS(RGBA_SINT32),
 258
 259    /* DXT compressed formats */
 260    FETCH_COMPRESSED(RGB_DXT1),
 261    FETCH_COMPRESSED(RGBA_DXT1),
 262    FETCH_COMPRESSED(RGBA_DXT3),
 263    FETCH_COMPRESSED(RGBA_DXT5),
 264
 265    /* DXT sRGB compressed formats */
 266    FETCH_COMPRESSED(SRGB_DXT1),
 267    FETCH_COMPRESSED(SRGBA_DXT1),
 268    FETCH_COMPRESSED(SRGBA_DXT3),
 269    FETCH_COMPRESSED(SRGBA_DXT5),
 270
 271    /* FXT1 compressed formats */
 272    FETCH_COMPRESSED(RGB_FXT1),
 273    FETCH_COMPRESSED(RGBA_FXT1),
 274
 275    /* RGTC compressed formats */
 276    FETCH_COMPRESSED(R_RGTC1_UNORM),
 277    FETCH_COMPRESSED(R_RGTC1_SNORM),
 278    FETCH_COMPRESSED(RG_RGTC2_UNORM),
 279    FETCH_COMPRESSED(RG_RGTC2_SNORM),
 280
 281    /* LATC1/2 compressed formats */
 282    FETCH_COMPRESSED(L_LATC1_UNORM),
 283    FETCH_COMPRESSED(L_LATC1_SNORM),
 284    FETCH_COMPRESSED(LA_LATC2_UNORM),
 285    FETCH_COMPRESSED(LA_LATC2_SNORM),
 286
 287    /* ETC1/2 compressed formats */
 288    FETCH_COMPRESSED(ETC1_RGB8),
 289    FETCH_COMPRESSED(ETC2_RGB8),
 290    FETCH_COMPRESSED(ETC2_SRGB8),
 291    FETCH_COMPRESSED(ETC2_RGBA8_EAC),
 292    FETCH_COMPRESSED(ETC2_SRGB8_ALPHA8_EAC),
 293    FETCH_COMPRESSED(ETC2_R11_EAC),
 294    FETCH_COMPRESSED(ETC2_RG11_EAC),
 295    FETCH_COMPRESSED(ETC2_SIGNED_R11_EAC),
 296    FETCH_COMPRESSED(ETC2_SIGNED_RG11_EAC),
 297    FETCH_COMPRESSED(ETC2_RGB8_PUNCHTHROUGH_ALPHA1),
 298    FETCH_COMPRESSED(ETC2_SRGB8_PUNCHTHROUGH_ALPHA1),
 299    FETCH_COMPRESSED(BPTC_RGBA_UNORM),
 300    FETCH_COMPRESSED(BPTC_SRGB_ALPHA_UNORM),
 301    FETCH_COMPRESSED(BPTC_RGB_SIGNED_FLOAT),
 302    FETCH_COMPRESSED(BPTC_RGB_UNSIGNED_FLOAT),
 303 };
 304
 305
 306 /**
 307  * Initialize the texture image's FetchTexel methods.
 308  */
 309 static void
 310 set_fetch_functions(const struct gl_sampler_object *samp,
 311                     struct swrast_texture_image *texImage, GLuint dims)
 312 {
 313    mesa_format format = texImage->Base.TexFormat;
 314
 315    if (samp->sRGBDecode == GL_SKIP_DECODE_EXT)
 316       format = _mesa_get_srgb_format_linear(format);
 317
 318    texImage->FetchTexel = NULL;
 319
 320    if (format < ARRAY_SIZE(texfetch_funcs)) {
 321       switch (dims) {
 322       case 1:
 323          texImage->FetchTexel = texfetch_funcs[format].Fetch1D;
 324          break;
 325       case 2:
 326          texImage->FetchTexel = texfetch_funcs[format].Fetch2D;
 327          break;
 328       case 3:
 329          texImage->FetchTexel = texfetch_funcs[format].Fetch3D;
 330          break;
 331       default:
 332          assert(!"Bad dims in set_fetch_functions()");
 333       }
 334    }
 335
 336    if (!texImage->FetchTexel)
 337       texImage->FetchTexel = fetch_null_texelf;
 338
 339    texImage->FetchCompressedTexel = _mesa_get_compressed_fetch_func(format);
 340
 341    assert(texImage->FetchTexel);
 342 }
 343
 344 void
 345 _mesa_update_fetch_functions(struct gl_context *ctx, GLuint unit)
 346 {
 347    struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
 348    struct gl_sampler_object *samp;
 349    GLuint face, i;
 350    GLuint dims;
 351
 352    if (!texObj)
 353       return;
 354
 355    samp = _mesa_get_samplerobj(ctx, unit);
 356
 357    dims = _mesa_get_texture_dimensions(texObj->Target);
 358
 359    for (face = 0; face < 6; face++) {
 360       for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
 361          if (texObj->Image[face][i]) {
 362             set_fetch_functions(samp,
 363                                 swrast_texture_image(texObj->Image[face][i]),
 364                                 dims);
 365          }
 366       }
 367    }
 368 }