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 #include "st_inlines.h"
  49
  50 #include "pipe/p_screen.h"
  51 #include "pipe/p_context.h"
  52 #include "util/u_pack_color.h"
  53
  54
  55 struct state_key
  56 {
  57    GLuint scaleAndBias:1;
  58    GLuint colorMatrix:1;
  59    GLuint colorMatrixPostScaleBias:1;
  60    GLuint pixelMaps:1;
  61
  62 #if 0
  63    GLfloat Maps[3][256][4];
  64    int NumMaps;
  65    GLint NumStages;
  66    pipeline_stage Stages[STAGE_MAX];
  67    GLboolean StagesUsed[STAGE_MAX];
  68    GLfloat Scale1[4], Bias1[4];
  69    GLfloat Scale2[4], Bias2[4];
  70 #endif
  71 };
  72
  73
  74 static GLboolean
  75 is_identity(const GLfloat m[16])
  76 {
  77    GLuint i;
  78    for (i = 0; i < 16; i++) {
  79       const int row = i % 4, col = i / 4;
  80       const float val = (GLfloat)(row == col);
  81       if (m[i] != val)
  82          return GL_FALSE;
  83    }
  84    return GL_TRUE;
  85 }
  86
  87
  88 static void
  89 make_state_key(GLcontext *ctx,  struct state_key *key)
  90 {
  91    static const GLfloat zero[4] = { 0.0f, 0.0f, 0.0f, 0.0f };
  92    static const GLfloat one[4] = { 1.0f, 1.0f, 1.0f, 1.0f };
  93
  94    memset(key, 0, sizeof(*key));
  95
  96    if (ctx->Pixel.RedBias != 0.0 || ctx->Pixel.RedScale != 1.0 ||
  97        ctx->Pixel.GreenBias != 0.0 || ctx->Pixel.GreenScale != 1.0 ||
  98        ctx->Pixel.BlueBias != 0.0 || ctx->Pixel.BlueScale != 1.0 ||
  99        ctx->Pixel.AlphaBias != 0.0 || ctx->Pixel.AlphaScale != 1.0) {
 100       key->scaleAndBias = 1;
 101    }
 102
 103    if (!is_identity(ctx->ColorMatrixStack.Top->m)) {
 104       key->colorMatrix = 1;
 105    }
 106
 107    if (!TEST_EQ_4V(ctx->Pixel.PostColorMatrixScale, one) ||
 108        !TEST_EQ_4V(ctx->Pixel.PostColorMatrixBias, zero)) {
 109       key->colorMatrixPostScaleBias = 1;
 110    }
 111
 112    key->pixelMaps = ctx->Pixel.MapColorFlag;
 113 }
 114
 115
 116 static struct pipe_texture *
 117 create_color_map_texture(GLcontext *ctx)
 118 {
 119    struct pipe_context *pipe = ctx->st->pipe;
 120    struct pipe_texture *pt;
 121    enum pipe_format format;
 122    const uint texSize = 256; /* simple, and usually perfect */
 123
 124    /* find an RGBA texture format */
 125    format = st_choose_format(pipe->screen, GL_RGBA,
 126                              PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 127
 128    /* create texture for color map/table */
 129    pt = st_texture_create(ctx->st, PIPE_TEXTURE_2D, format, 0,
 130                           texSize, texSize, 1, PIPE_TEXTURE_USAGE_SAMPLER);
 131    return pt;
 132 }
 133
 134
 135 /**
 136  * Update the pixelmap texture with the contents of the R/G/B/A pixel maps.
 137  */
 138 static void
 139 load_color_map_texture(GLcontext *ctx, struct pipe_texture *pt)
 140 {
 141    struct pipe_context *pipe = ctx->st->pipe;
 142    struct pipe_screen *screen = pipe->screen;
 143    struct pipe_transfer *transfer;
 144    const GLuint rSize = ctx->PixelMaps.RtoR.Size;
 145    const GLuint gSize = ctx->PixelMaps.GtoG.Size;
 146    const GLuint bSize = ctx->PixelMaps.BtoB.Size;
 147    const GLuint aSize = ctx->PixelMaps.AtoA.Size;
 148    const uint texSize = pt->width[0];
 149    uint *dest;
 150    uint i, j;
 151
 152    transfer = st_cond_flush_get_tex_transfer(st_context(ctx),
 153                                              pt, 0, 0, 0, PIPE_TRANSFER_WRITE,
 154                                              0, 0, texSize, texSize);
 155    dest = (uint *) screen->transfer_map(screen, transfer);
 156
 157    /* Pack four 1D maps into a 2D texture:
 158     * R map is placed horizontally, indexed by S, in channel 0
 159     * G map is placed vertically, indexed by T, in channel 1
 160     * B map is placed horizontally, indexed by S, in channel 2
 161     * A map is placed vertically, indexed by T, in channel 3
 162     */
 163    for (i = 0; i < texSize; i++) {
 164       for (j = 0; j < texSize; j++) {
 165          int k = (i * texSize + j);
 166          ubyte r = ctx->PixelMaps.RtoR.Map8[j * rSize / texSize];
 167          ubyte g = ctx->PixelMaps.GtoG.Map8[i * gSize / texSize];
 168          ubyte b = ctx->PixelMaps.BtoB.Map8[j * bSize / texSize];
 169          ubyte a = ctx->PixelMaps.AtoA.Map8[i * aSize / texSize];
 170          util_pack_color_ub(r, g, b, a, pt->format, dest + k);
 171       }
 172    }
 173
 174    screen->transfer_unmap(screen, transfer);
 175    screen->tex_transfer_destroy(transfer);
 176 }
 177
 178
 179
 180 #define MAX_INST 100
 181
 182 /**
 183  * Returns a fragment program which implements the current pixel transfer ops.
 184  */
 185 static struct gl_fragment_program *
 186 get_pixel_transfer_program(GLcontext *ctx, const struct state_key *key)
 187 {
 188    struct st_context *st = ctx->st;
 189    struct prog_instruction inst[MAX_INST];
 190    struct gl_program_parameter_list *params;
 191    struct gl_fragment_program *fp;
 192    GLuint ic = 0;
 193    const GLuint colorTemp = 0;
 194
 195    fp = (struct gl_fragment_program *)
 196       ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 197    if (!fp)
 198       return NULL;
 199
 200    params = _mesa_new_parameter_list();
 201
 202    /*
 203     * Get initial pixel color from the texture.
 204     * TEX colorTemp, fragment.texcoord[0], texture[0], 2D;
 205     */
 206    _mesa_init_instructions(inst + ic, 1);
 207    inst[ic].Opcode = OPCODE_TEX;
 208    inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 209    inst[ic].DstReg.Index = colorTemp;
 210    inst[ic].SrcReg[0].File = PROGRAM_INPUT;
 211    inst[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 212    inst[ic].TexSrcUnit = 0;
 213    inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 214    ic++;
 215    fp->Base.InputsRead = (1 << FRAG_ATTRIB_TEX0);
 216    fp->Base.OutputsWritten = (1 << FRAG_RESULT_COLOR);
 217    fp->Base.SamplersUsed = 0x1;  /* sampler 0 (bit 0) is used */
 218
 219    if (key->scaleAndBias) {
 220       static const gl_state_index scale_state[STATE_LENGTH] =
 221          { STATE_INTERNAL, STATE_PT_SCALE, 0, 0, 0 };
 222       static const gl_state_index bias_state[STATE_LENGTH] =
 223          { STATE_INTERNAL, STATE_PT_BIAS, 0, 0, 0 };
 224       GLfloat scale[4], bias[4];
 225       GLint scale_p, bias_p;
 226
 227       scale[0] = ctx->Pixel.RedScale;
 228       scale[1] = ctx->Pixel.GreenScale;
 229       scale[2] = ctx->Pixel.BlueScale;
 230       scale[3] = ctx->Pixel.AlphaScale;
 231       bias[0] = ctx->Pixel.RedBias;
 232       bias[1] = ctx->Pixel.GreenBias;
 233       bias[2] = ctx->Pixel.BlueBias;
 234       bias[3] = ctx->Pixel.AlphaBias;
 235
 236       scale_p = _mesa_add_state_reference(params, scale_state);
 237       bias_p = _mesa_add_state_reference(params, bias_state);
 238
 239       /* MAD colorTemp, colorTemp, scale, bias; */
 240       _mesa_init_instructions(inst + ic, 1);
 241       inst[ic].Opcode = OPCODE_MAD;
 242       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 243       inst[ic].DstReg.Index = colorTemp;
 244       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 245       inst[ic].SrcReg[0].Index = colorTemp;
 246       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 247       inst[ic].SrcReg[1].Index = scale_p;
 248       inst[ic].SrcReg[2].File = PROGRAM_STATE_VAR;
 249       inst[ic].SrcReg[2].Index = bias_p;
 250       ic++;
 251    }
 252
 253    if (key->pixelMaps) {
 254       const GLuint temp = 1;
 255
 256       /* create the colormap/texture now if not already done */
 257       if (!st->pixel_xfer.pixelmap_texture) {
 258          st->pixel_xfer.pixelmap_texture = create_color_map_texture(ctx);
 259       }
 260
 261       /* with a little effort, we can do four pixel map look-ups with
 262        * two TEX instructions:
 263        */
 264
 265       /* TEX temp.rg, colorTemp.rgba, texture[1], 2D; */
 266       _mesa_init_instructions(inst + ic, 1);
 267       inst[ic].Opcode = OPCODE_TEX;
 268       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 269       inst[ic].DstReg.Index = temp;
 270       inst[ic].DstReg.WriteMask = WRITEMASK_XY; /* write R,G */
 271       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 272       inst[ic].SrcReg[0].Index = colorTemp;
 273       inst[ic].TexSrcUnit = 1;
 274       inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 275       ic++;
 276
 277       /* TEX temp.ba, colorTemp.baba, texture[1], 2D; */
 278       _mesa_init_instructions(inst + ic, 1);
 279       inst[ic].Opcode = OPCODE_TEX;
 280       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 281       inst[ic].DstReg.Index = temp;
 282       inst[ic].DstReg.WriteMask = WRITEMASK_ZW; /* write B,A */
 283       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 284       inst[ic].SrcReg[0].Index = colorTemp;
 285       inst[ic].SrcReg[0].Swizzle = MAKE_SWIZZLE4(SWIZZLE_Z, SWIZZLE_W,
 286                                                  SWIZZLE_Z, SWIZZLE_W);
 287       inst[ic].TexSrcUnit = 1;
 288       inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 289       ic++;
 290
 291       /* MOV colorTemp, temp; */
 292       _mesa_init_instructions(inst + ic, 1);
 293       inst[ic].Opcode = OPCODE_MOV;
 294       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 295       inst[ic].DstReg.Index = colorTemp;
 296       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 297       inst[ic].SrcReg[0].Index = temp;
 298       ic++;
 299
 300       fp->Base.SamplersUsed |= (1 << 1);  /* sampler 1 is used */
 301    }
 302
 303    if (key->colorMatrix) {
 304       static const gl_state_index row0_state[STATE_LENGTH] =
 305          { STATE_COLOR_MATRIX, 0, 0, 0, 0 };
 306       static const gl_state_index row1_state[STATE_LENGTH] =
 307          { STATE_COLOR_MATRIX, 0, 1, 1, 0 };
 308       static const gl_state_index row2_state[STATE_LENGTH] =
 309          { STATE_COLOR_MATRIX, 0, 2, 2, 0 };
 310       static const gl_state_index row3_state[STATE_LENGTH] =
 311          { STATE_COLOR_MATRIX, 0, 3, 3, 0 };
 312
 313       GLint row0_p = _mesa_add_state_reference(params, row0_state);
 314       GLint row1_p = _mesa_add_state_reference(params, row1_state);
 315       GLint row2_p = _mesa_add_state_reference(params, row2_state);
 316       GLint row3_p = _mesa_add_state_reference(params, row3_state);
 317       const GLuint temp = 1;
 318
 319       /* DP4 temp.x, colorTemp, matrow0; */
 320       _mesa_init_instructions(inst + ic, 1);
 321       inst[ic].Opcode = OPCODE_DP4;
 322       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 323       inst[ic].DstReg.Index = temp;
 324       inst[ic].DstReg.WriteMask = WRITEMASK_X;
 325       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 326       inst[ic].SrcReg[0].Index = colorTemp;
 327       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 328       inst[ic].SrcReg[1].Index = row0_p;
 329       ic++;
 330
 331       /* DP4 temp.y, colorTemp, matrow1; */
 332       _mesa_init_instructions(inst + ic, 1);
 333       inst[ic].Opcode = OPCODE_DP4;
 334       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 335       inst[ic].DstReg.Index = temp;
 336       inst[ic].DstReg.WriteMask = WRITEMASK_Y;
 337       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 338       inst[ic].SrcReg[0].Index = colorTemp;
 339       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 340       inst[ic].SrcReg[1].Index = row1_p;
 341       ic++;
 342
 343       /* DP4 temp.z, colorTemp, matrow2; */
 344       _mesa_init_instructions(inst + ic, 1);
 345       inst[ic].Opcode = OPCODE_DP4;
 346       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 347       inst[ic].DstReg.Index = temp;
 348       inst[ic].DstReg.WriteMask = WRITEMASK_Z;
 349       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 350       inst[ic].SrcReg[0].Index = colorTemp;
 351       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 352       inst[ic].SrcReg[1].Index = row2_p;
 353       ic++;
 354
 355       /* DP4 temp.w, colorTemp, matrow3; */
 356       _mesa_init_instructions(inst + ic, 1);
 357       inst[ic].Opcode = OPCODE_DP4;
 358       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 359       inst[ic].DstReg.Index = temp;
 360       inst[ic].DstReg.WriteMask = WRITEMASK_W;
 361       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 362       inst[ic].SrcReg[0].Index = colorTemp;
 363       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 364       inst[ic].SrcReg[1].Index = row3_p;
 365       ic++;
 366
 367       /* MOV colorTemp, temp; */
 368       _mesa_init_instructions(inst + ic, 1);
 369       inst[ic].Opcode = OPCODE_MOV;
 370       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 371       inst[ic].DstReg.Index = colorTemp;
 372       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 373       inst[ic].SrcReg[0].Index = temp;
 374       ic++;
 375    }
 376
 377    if (key->colorMatrixPostScaleBias) {
 378       static const gl_state_index scale_state[STATE_LENGTH] =
 379          { STATE_INTERNAL, STATE_PT_SCALE, 0, 0, 0 };
 380       static const gl_state_index bias_state[STATE_LENGTH] =
 381          { STATE_INTERNAL, STATE_PT_BIAS, 0, 0, 0 };
 382       GLint scale_param, bias_param;
 383
 384       scale_param = _mesa_add_state_reference(params, scale_state);
 385       bias_param = _mesa_add_state_reference(params, bias_state);
 386
 387       _mesa_init_instructions(inst + ic, 1);
 388       inst[ic].Opcode = OPCODE_MAD;
 389       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 390       inst[ic].DstReg.Index = colorTemp;
 391       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 392       inst[ic].SrcReg[0].Index = colorTemp;
 393       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 394       inst[ic].SrcReg[1].Index = scale_param;
 395       inst[ic].SrcReg[2].File = PROGRAM_STATE_VAR;
 396       inst[ic].SrcReg[2].Index = bias_param;
 397       ic++;
 398    }
 399
 400    /* Modify last instruction's dst reg to write to result.color */
 401    {
 402       struct prog_instruction *last = &inst[ic - 1];
 403       last->DstReg.File = PROGRAM_OUTPUT;
 404       last->DstReg.Index = FRAG_RESULT_COLOR;
 405    }
 406
 407    /* END; */
 408    _mesa_init_instructions(inst + ic, 1);
 409    inst[ic].Opcode = OPCODE_END;
 410    ic++;
 411
 412    assert(ic <= MAX_INST);
 413
 414
 415    fp->Base.Instructions = _mesa_alloc_instructions(ic);
 416    if (!fp->Base.Instructions) {
 417       _mesa_error(ctx, GL_OUT_OF_MEMORY,
 418                   "generating pixel transfer program");
 419       return NULL;
 420    }
 421
 422    _mesa_copy_instructions(fp->Base.Instructions, inst, ic);
 423    fp->Base.NumInstructions = ic;
 424    fp->Base.Parameters = params;
 425
 426 #if 0
 427    printf("========= pixel transfer prog\n");
 428    _mesa_print_program(&fp->Base);
 429    _mesa_print_parameter_list(fp->Base.Parameters);
 430 #endif
 431
 432    return fp;
 433 }
 434
 435
 436
 437 /**
 438  * Update st->pixel_xfer.program in response to new pixel-transfer state.
 439  */
 440 static void
 441 update_pixel_transfer(struct st_context *st)
 442 {
 443    GLcontext *ctx = st->ctx;
 444    struct state_key key;
 445    struct gl_fragment_program *fp;
 446
 447    make_state_key(st->ctx, &key);
 448
 449    fp = (struct gl_fragment_program *)
 450       _mesa_search_program_cache(st->pixel_xfer.cache, &key, sizeof(key));
 451    if (!fp) {
 452       fp = get_pixel_transfer_program(st->ctx, &key);
 453       _mesa_program_cache_insert(st->ctx, st->pixel_xfer.cache,
 454                                  &key, sizeof(key), &fp->Base);
 455    }
 456
 457    if (ctx->Pixel.MapColorFlag) {
 458       load_color_map_texture(ctx, st->pixel_xfer.pixelmap_texture);
 459    }
 460    st->pixel_xfer.pixelmap_enabled = ctx->Pixel.MapColorFlag;
 461
 462    st->pixel_xfer.program = (struct st_fragment_program *) fp;
 463 }
 464
 465
 466
 467 const struct st_tracked_state st_update_pixel_transfer = {
 468    "st_update_pixel_transfer",                          /* name */
 469    {                                                    /* dirty */
 470       _NEW_PIXEL | _NEW_COLOR_MATRIX,                   /* mesa */
 471       0,                                                /* st */
 472    },
 473    update_pixel_transfer                                /* update */
 474 };