src/mesa/state_tracker/st_atom_pixeltransfer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /*
  29  * Generate fragment programs to implement pixel transfer ops, such as
  30  * scale/bias, colormatrix, colortable, convolution...
  31  *
  32  * Authors:
  33  *   Brian Paul
  34  */
  35
  36 #include "main/imports.h"
  37 #include "main/image.h"
  38 #include "main/macros.h"
  39 #include "shader/program.h"
  40 #include "shader/prog_instruction.h"
  41 #include "shader/prog_parameter.h"
  42 #include "shader/prog_print.h"
  43
  44 #include "st_context.h"
  45 #include "st_format.h"
  46 #include "st_program.h"
  47 #include "st_texture.h"
  48
  49 #include "pipe/p_screen.h"
  50 #include "pipe/p_context.h"
  51 #include "util/u_pack_color.h"
  52
  53
  54 struct state_key
  55 {
  56    GLuint scaleAndBias:1;
  57    GLuint colorMatrix:1;
  58    GLuint colorMatrixPostScaleBias:1;
  59    GLuint pixelMaps:1;
  60
  61 #if 0
  62    GLfloat Maps[3][256][4];
  63    int NumMaps;
  64    GLint NumStages;
  65    pipeline_stage Stages[STAGE_MAX];
  66    GLboolean StagesUsed[STAGE_MAX];
  67    GLfloat Scale1[4], Bias1[4];
  68    GLfloat Scale2[4], Bias2[4];
  69 #endif
  70 };
  71
  72
  73 static GLboolean
  74 is_identity(const GLfloat m[16])
  75 {
  76    GLuint i;
  77    for (i = 0; i < 16; i++) {
  78       const int row = i % 4, col = i / 4;
  79       const float val = (GLfloat)(row == col);
  80       if (m[i] != val)
  81          return GL_FALSE;
  82    }
  83    return GL_TRUE;
  84 }
  85
  86
  87 static void
  88 make_state_key(GLcontext *ctx,  struct state_key *key)
  89 {
  90    static const GLfloat zero[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
  91    static const GLfloat one[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
  92
  93    memset(key, 0, sizeof(*key));
  94
  95    if (ctx->Pixel.RedBias != 0.0 || ctx->Pixel.RedScale != 1.0 ||
  96        ctx->Pixel.GreenBias != 0.0 || ctx->Pixel.GreenScale != 1.0 ||
  97        ctx->Pixel.BlueBias != 0.0 || ctx->Pixel.BlueScale != 1.0 ||
  98        ctx->Pixel.AlphaBias != 0.0 || ctx->Pixel.AlphaScale != 1.0) {
  99       key->scaleAndBias = 1;
 100    }
 101
 102    if (!is_identity(ctx->ColorMatrixStack.Top->m)) {
 103       key->colorMatrix = 1;
 104    }
 105
 106    if (!TEST_EQ_4V(ctx->Pixel.PostColorMatrixScale, one) ||
 107        !TEST_EQ_4V(ctx->Pixel.PostColorMatrixBias, zero)) {
 108       key->colorMatrixPostScaleBias = 1;
 109    }
 110
 111    key->pixelMaps = ctx->Pixel.MapColorFlag;
 112 }
 113
 114
 115 static struct pipe_texture *
 116 create_color_map_texture(GLcontext *ctx)
 117 {
 118    struct pipe_context *pipe = ctx->st->pipe;
 119    struct pipe_texture *pt;
 120    enum pipe_format format;
 121    const uint texSize = 256; /* simple, and usually perfect */
 122
 123    /* find an RGBA texture format */
 124    format = st_choose_format(pipe, GL_RGBA, PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 125
 126    /* create texture for color map/table */
 127    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, format, 0,
 128                           texSize, texSize, 1, 0,
 129                           PIPE_TEXTURE_USAGE_SAMPLER);
 130    return pt;
 131 }
 132
 133
 134 /**
 135  * Update the pixelmap texture with the contents of the R/G/B/A pixel maps.
 136  */
 137 static void
 138 load_color_map_texture(GLcontext *ctx, struct pipe_texture *pt)
 139 {
 140    struct pipe_context *pipe = ctx->st->pipe;
 141    struct pipe_screen *screen = pipe->screen;
 142    struct pipe_transfer *transfer;
 143    const GLuint rSize = ctx->PixelMaps.RtoR.Size;
 144    const GLuint gSize = ctx->PixelMaps.GtoG.Size;
 145    const GLuint bSize = ctx->PixelMaps.BtoB.Size;
 146    const GLuint aSize = ctx->PixelMaps.AtoA.Size;
 147    const uint texSize = pt->width[0];
 148    uint *dest;
 149    uint i, j;
 150
 151    transfer = screen->get_tex_transfer(screen, pt, 0, 0, 0, PIPE_TRANSFER_WRITE,
 152                                        0, 0, texSize, texSize);
 153    dest = (uint *) screen->transfer_map(screen, transfer);
 154
 155    /* Pack four 1D maps into a 2D texture:
 156     * R map is placed horizontally, indexed by S, in channel 0
 157     * G map is placed vertically, indexed by T, in channel 1
 158     * B map is placed horizontally, indexed by S, in channel 2
 159     * A map is placed vertically, indexed by T, in channel 3
 160     */
 161    for (i = 0; i < texSize; i++) {
 162       for (j = 0; j < texSize; j++) {
 163          int k = (i * texSize + j);
 164          ubyte r = ctx->PixelMaps.RtoR.Map8[j * rSize / texSize];
 165          ubyte g = ctx->PixelMaps.GtoG.Map8[i * gSize / texSize];
 166          ubyte b = ctx->PixelMaps.BtoB.Map8[j * bSize / texSize];
 167          ubyte a = ctx->PixelMaps.AtoA.Map8[i * aSize / texSize];
 168          util_pack_color_ub(r, g, b, a, pt->format, dest + k);
 169       }
 170    }
 171
 172    screen->transfer_unmap(screen, transfer);
 173    screen->tex_transfer_destroy(transfer);
 174 }
 175
 176
 177
 178 #define MAX_INST 100
 179
 180 /**
 181  * Returns a fragment program which implements the current pixel transfer ops.
 182  */
 183 static struct gl_fragment_program *
 184 get_pixel_transfer_program(GLcontext *ctx, const struct state_key *key)
 185 {
 186    struct st_context *st = ctx->st;
 187    struct prog_instruction inst[MAX_INST];
 188    struct gl_program_parameter_list *params;
 189    struct gl_fragment_program *fp;
 190    GLuint ic = 0;
 191    const GLuint colorTemp = 0;
 192
 193    fp = (struct gl_fragment_program *)
 194       ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 195    if (!fp)
 196       return NULL;
 197
 198    params = _mesa_new_parameter_list();
 199
 200    /*
 201     * Get initial pixel color from the texture.
 202     * TEX colorTemp, fragment.texcoord[0], texture[0], 2D;
 203     */
 204    _mesa_init_instructions(inst + ic, 1);
 205    inst[ic].Opcode = OPCODE_TEX;
 206    inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 207    inst[ic].DstReg.Index = colorTemp;
 208    inst[ic].SrcReg[0].File = PROGRAM_INPUT;
 209    inst[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 210    inst[ic].TexSrcUnit = 0;
 211    inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 212    ic++;
 213    fp->Base.InputsRead = (1 << FRAG_ATTRIB_TEX0);
 214    fp->Base.OutputsWritten = (1 << FRAG_RESULT_COLOR);
 215    fp->Base.SamplersUsed = 0x1;  /* sampler 0 (bit 0) is used */
 216
 217    if (key->scaleAndBias) {
 218       static const gl_state_index scale_state[STATE_LENGTH] =
 219          { STATE_INTERNAL, STATE_PT_SCALE, 0, 0, 0 };
 220       static const gl_state_index bias_state[STATE_LENGTH] =
 221          { STATE_INTERNAL, STATE_PT_BIAS, 0, 0, 0 };
 222       GLfloat scale[4], bias[4];
 223       GLint scale_p, bias_p;
 224
 225       scale[0] = ctx->Pixel.RedScale;
 226       scale[1] = ctx->Pixel.GreenScale;
 227       scale[2] = ctx->Pixel.BlueScale;
 228       scale[3] = ctx->Pixel.AlphaScale;
 229       bias[0] = ctx->Pixel.RedBias;
 230       bias[1] = ctx->Pixel.GreenBias;
 231       bias[2] = ctx->Pixel.BlueBias;
 232       bias[3] = ctx->Pixel.AlphaBias;
 233
 234       scale_p = _mesa_add_state_reference(params, scale_state);
 235       bias_p = _mesa_add_state_reference(params, bias_state);
 236
 237       /* MAD colorTemp, colorTemp, scale, bias; */
 238       _mesa_init_instructions(inst + ic, 1);
 239       inst[ic].Opcode = OPCODE_MAD;
 240       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 241       inst[ic].DstReg.Index = colorTemp;
 242       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 243       inst[ic].SrcReg[0].Index = colorTemp;
 244       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 245       inst[ic].SrcReg[1].Index = scale_p;
 246       inst[ic].SrcReg[2].File = PROGRAM_STATE_VAR;
 247       inst[ic].SrcReg[2].Index = bias_p;
 248       ic++;
 249    }
 250
 251    if (key->pixelMaps) {
 252       const GLuint temp = 1;
 253
 254       /* create the colormap/texture now if not already done */
 255       if (!st->pixel_xfer.pixelmap_texture) {
 256          st->pixel_xfer.pixelmap_texture = create_color_map_texture(ctx);
 257       }
 258
 259       /* with a little effort, we can do four pixel map look-ups with
 260        * two TEX instructions:
 261        */
 262
 263       /* TEX temp.rg, colorTemp.rgba, texture[1], 2D; */
 264       _mesa_init_instructions(inst + ic, 1);
 265       inst[ic].Opcode = OPCODE_TEX;
 266       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 267       inst[ic].DstReg.Index = temp;
 268       inst[ic].DstReg.WriteMask = WRITEMASK_XY; /* write R,G */
 269       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 270       inst[ic].SrcReg[0].Index = colorTemp;
 271       inst[ic].TexSrcUnit = 1;
 272       inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 273       ic++;
 274
 275       /* TEX temp.ba, colorTemp.baba, texture[1], 2D; */
 276       _mesa_init_instructions(inst + ic, 1);
 277       inst[ic].Opcode = OPCODE_TEX;
 278       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 279       inst[ic].DstReg.Index = temp;
 280       inst[ic].DstReg.WriteMask = WRITEMASK_ZW; /* write B,A */
 281       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 282       inst[ic].SrcReg[0].Index = colorTemp;
 283       inst[ic].SrcReg[0].Swizzle = MAKE_SWIZZLE4(SWIZZLE_Z, SWIZZLE_W,
 284                                                  SWIZZLE_Z, SWIZZLE_W);
 285       inst[ic].TexSrcUnit = 1;
 286       inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 287       ic++;
 288
 289       /* MOV colorTemp, temp; */
 290       _mesa_init_instructions(inst + ic, 1);
 291       inst[ic].Opcode = OPCODE_MOV;
 292       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 293       inst[ic].DstReg.Index = colorTemp;
 294       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 295       inst[ic].SrcReg[0].Index = temp;
 296       ic++;
 297
 298       fp->Base.SamplersUsed |= (1 << 1);  /* sampler 1 is used */
 299    }
 300
 301    if (key->colorMatrix) {
 302       static const gl_state_index row0_state[STATE_LENGTH] =
 303          { STATE_COLOR_MATRIX, 0, 0, 0, 0 };
 304       static const gl_state_index row1_state[STATE_LENGTH] =
 305          { STATE_COLOR_MATRIX, 0, 1, 1, 0 };
 306       static const gl_state_index row2_state[STATE_LENGTH] =
 307          { STATE_COLOR_MATRIX, 0, 2, 2, 0 };
 308       static const gl_state_index row3_state[STATE_LENGTH] =
 309          { STATE_COLOR_MATRIX, 0, 3, 3, 0 };
 310
 311       GLint row0_p = _mesa_add_state_reference(params, row0_state);
 312       GLint row1_p = _mesa_add_state_reference(params, row1_state);
 313       GLint row2_p = _mesa_add_state_reference(params, row2_state);
 314       GLint row3_p = _mesa_add_state_reference(params, row3_state);
 315       const GLuint temp = 1;
 316
 317       /* DP4 temp.x, colorTemp, matrow0; */
 318       _mesa_init_instructions(inst + ic, 1);
 319       inst[ic].Opcode = OPCODE_DP4;
 320       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 321       inst[ic].DstReg.Index = temp;
 322       inst[ic].DstReg.WriteMask = WRITEMASK_X;
 323       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 324       inst[ic].SrcReg[0].Index = colorTemp;
 325       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 326       inst[ic].SrcReg[1].Index = row0_p;
 327       ic++;
 328
 329       /* DP4 temp.y, colorTemp, matrow1; */
 330       _mesa_init_instructions(inst + ic, 1);
 331       inst[ic].Opcode = OPCODE_DP4;
 332       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 333       inst[ic].DstReg.Index = temp;
 334       inst[ic].DstReg.WriteMask = WRITEMASK_Y;
 335       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 336       inst[ic].SrcReg[0].Index = colorTemp;
 337       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 338       inst[ic].SrcReg[1].Index = row1_p;
 339       ic++;
 340
 341       /* DP4 temp.z, colorTemp, matrow2; */
 342       _mesa_init_instructions(inst + ic, 1);
 343       inst[ic].Opcode = OPCODE_DP4;
 344       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 345       inst[ic].DstReg.Index = temp;
 346       inst[ic].DstReg.WriteMask = WRITEMASK_Z;
 347       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 348       inst[ic].SrcReg[0].Index = colorTemp;
 349       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 350       inst[ic].SrcReg[1].Index = row2_p;
 351       ic++;
 352
 353       /* DP4 temp.w, colorTemp, matrow3; */
 354       _mesa_init_instructions(inst + ic, 1);
 355       inst[ic].Opcode = OPCODE_DP4;
 356       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 357       inst[ic].DstReg.Index = temp;
 358       inst[ic].DstReg.WriteMask = WRITEMASK_W;
 359       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 360       inst[ic].SrcReg[0].Index = colorTemp;
 361       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 362       inst[ic].SrcReg[1].Index = row3_p;
 363       ic++;
 364
 365       /* MOV colorTemp, temp; */
 366       _mesa_init_instructions(inst + ic, 1);
 367       inst[ic].Opcode = OPCODE_MOV;
 368       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 369       inst[ic].DstReg.Index = colorTemp;
 370       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 371       inst[ic].SrcReg[0].Index = temp;
 372       ic++;
 373    }
 374
 375    if (key->colorMatrixPostScaleBias) {
 376       static const gl_state_index scale_state[STATE_LENGTH] =
 377          { STATE_INTERNAL, STATE_PT_SCALE, 0, 0, 0 };
 378       static const gl_state_index bias_state[STATE_LENGTH] =
 379          { STATE_INTERNAL, STATE_PT_BIAS, 0, 0, 0 };
 380       GLint scale_param, bias_param;
 381
 382       scale_param = _mesa_add_state_reference(params, scale_state);
 383       bias_param = _mesa_add_state_reference(params, bias_state);
 384
 385       _mesa_init_instructions(inst + ic, 1);
 386       inst[ic].Opcode = OPCODE_MAD;
 387       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 388       inst[ic].DstReg.Index = colorTemp;
 389       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 390       inst[ic].SrcReg[0].Index = colorTemp;
 391       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 392       inst[ic].SrcReg[1].Index = scale_param;
 393       inst[ic].SrcReg[2].File = PROGRAM_STATE_VAR;
 394       inst[ic].SrcReg[2].Index = bias_param;
 395       ic++;
 396    }
 397
 398    /* Modify last instruction's dst reg to write to result.color */
 399    {
 400       struct prog_instruction *last = &inst[ic - 1];
 401       last->DstReg.File = PROGRAM_OUTPUT;
 402       last->DstReg.Index = FRAG_RESULT_COLOR;
 403    }
 404
 405    /* END; */
 406    _mesa_init_instructions(inst + ic, 1);
 407    inst[ic].Opcode = OPCODE_END;
 408    ic++;
 409
 410    assert(ic <= MAX_INST);
 411
 412
 413    fp->Base.Instructions = _mesa_alloc_instructions(ic);
 414    if (!fp->Base.Instructions) {
 415       _mesa_error(ctx, GL_OUT_OF_MEMORY,
 416                   "generating pixel transfer program");
 417       return NULL;
 418    }
 419
 420    _mesa_copy_instructions(fp->Base.Instructions, inst, ic);
 421    fp->Base.NumInstructions = ic;
 422    fp->Base.Parameters = params;
 423
 424 #if 0
 425    printf("========= pixel transfer prog\n");
 426    _mesa_print_program(&fp->Base);
 427    _mesa_print_parameter_list(fp->Base.Parameters);
 428 #endif
 429
 430    return fp;
 431 }
 432
 433
 434
 435 /**
 436  * Update st->pixel_xfer.program in response to new pixel-transfer state.
 437  */
 438 static void
 439 update_pixel_transfer(struct st_context *st)
 440 {
 441    GLcontext *ctx = st->ctx;
 442    struct state_key key;
 443    struct gl_fragment_program *fp;
 444
 445    make_state_key(st->ctx, &key);
 446
 447    fp = (struct gl_fragment_program *)
 448       _mesa_search_program_cache(st->pixel_xfer.cache, &key, sizeof(key));
 449    if (!fp) {
 450       fp = get_pixel_transfer_program(st->ctx, &key);
 451       _mesa_program_cache_insert(st->ctx, st->pixel_xfer.cache,
 452                                  &key, sizeof(key), &fp->Base);
 453    }
 454
 455    if (ctx->Pixel.MapColorFlag) {
 456       load_color_map_texture(ctx, st->pixel_xfer.pixelmap_texture);
 457    }
 458    st->pixel_xfer.pixelmap_enabled = ctx->Pixel.MapColorFlag;
 459
 460    st->pixel_xfer.program = (struct st_fragment_program *) fp;
 461 }
 462
 463
 464
 465 const struct st_tracked_state st_update_pixel_transfer = {
 466    "st_update_pixel_transfer",                          /* name */
 467    {                                                    /* dirty */
 468       _NEW_PIXEL | _NEW_COLOR_MATRIX,                   /* mesa */
 469       0,                                                /* st */
 470    },
 471    update_pixel_transfer                                /* update */
 472 };