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, 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 "program/program.h"
  40 #include "program/prog_cache.h"
  41 #include "program/prog_instruction.h"
  42 #include "program/prog_parameter.h"
  43 #include "program/prog_print.h"
  44
  45 #include "st_context.h"
  46 #include "st_format.h"
  47 #include "st_texture.h"
  48
  49 #include "pipe/p_screen.h"
  50 #include "pipe/p_context.h"
  51 #include "util/u_inlines.h"
  52 #include "util/u_pack_color.h"
  53
  54
  55 struct state_key
  56 {
  57    GLuint scaleAndBias:1;
  58    GLuint pixelMaps:1;
  59
  60 #if 0
  61    GLfloat Maps[3][256][4];
  62    int NumMaps;
  63    GLint NumStages;
  64    pipeline_stage Stages[STAGE_MAX];
  65    GLboolean StagesUsed[STAGE_MAX];
  66    GLfloat Scale1[4], Bias1[4];
  67    GLfloat Scale2[4], Bias2[4];
  68 #endif
  69 };
  70
  71 static void
  72 make_state_key(struct gl_context *ctx,  struct state_key *key)
  73 {
  74    memset(key, 0, sizeof(*key));
  75
  76    if (ctx->Pixel.RedBias != 0.0 || ctx->Pixel.RedScale != 1.0 ||
  77        ctx->Pixel.GreenBias != 0.0 || ctx->Pixel.GreenScale != 1.0 ||
  78        ctx->Pixel.BlueBias != 0.0 || ctx->Pixel.BlueScale != 1.0 ||
  79        ctx->Pixel.AlphaBias != 0.0 || ctx->Pixel.AlphaScale != 1.0) {
  80       key->scaleAndBias = 1;
  81    }
  82
  83    key->pixelMaps = ctx->Pixel.MapColorFlag;
  84 }
  85
  86
  87 static struct pipe_resource *
  88 create_color_map_texture(struct gl_context *ctx)
  89 {
  90    struct st_context *st = st_context(ctx);
  91    struct pipe_context *pipe = st->pipe;
  92    struct pipe_resource *pt;
  93    enum pipe_format format;
  94    const uint texSize = 256; /* simple, and usually perfect */
  95
  96    /* find an RGBA texture format */
  97    format = st_choose_format(pipe->screen, GL_RGBA, GL_NONE, GL_NONE,
  98                              PIPE_TEXTURE_2D, 0, PIPE_BIND_SAMPLER_VIEW);
  99
 100    /* create texture for color map/table */
 101    pt = st_texture_create(st, PIPE_TEXTURE_2D, format, 0,
 102                           texSize, texSize, 1, 1, PIPE_BIND_SAMPLER_VIEW);
 103    return pt;
 104 }
 105
 106
 107 /**
 108  * Update the pixelmap texture with the contents of the R/G/B/A pixel maps.
 109  */
 110 static void
 111 load_color_map_texture(struct gl_context *ctx, struct pipe_resource *pt)
 112 {
 113    struct st_context *st = st_context(ctx);
 114    struct pipe_context *pipe = st->pipe;
 115    struct pipe_transfer *transfer;
 116    const GLuint rSize = ctx->PixelMaps.RtoR.Size;
 117    const GLuint gSize = ctx->PixelMaps.GtoG.Size;
 118    const GLuint bSize = ctx->PixelMaps.BtoB.Size;
 119    const GLuint aSize = ctx->PixelMaps.AtoA.Size;
 120    const uint texSize = pt->width0;
 121    uint *dest;
 122    uint i, j;
 123
 124    transfer = pipe_get_transfer(pipe,
 125                                 pt, 0, 0, PIPE_TRANSFER_WRITE,
 126                                 0, 0, texSize, texSize);
 127    dest = (uint *) pipe_transfer_map(pipe, transfer);
 128
 129    /* Pack four 1D maps into a 2D texture:
 130     * R map is placed horizontally, indexed by S, in channel 0
 131     * G map is placed vertically, indexed by T, in channel 1
 132     * B map is placed horizontally, indexed by S, in channel 2
 133     * A map is placed vertically, indexed by T, in channel 3
 134     */
 135    for (i = 0; i < texSize; i++) {
 136       for (j = 0; j < texSize; j++) {
 137          union util_color uc;
 138          int k = (i * texSize + j);
 139          ubyte r = ctx->PixelMaps.RtoR.Map8[j * rSize / texSize];
 140          ubyte g = ctx->PixelMaps.GtoG.Map8[i * gSize / texSize];
 141          ubyte b = ctx->PixelMaps.BtoB.Map8[j * bSize / texSize];
 142          ubyte a = ctx->PixelMaps.AtoA.Map8[i * aSize / texSize];
 143          util_pack_color_ub(r, g, b, a, pt->format, &uc);
 144          *(dest + k) = uc.ui;
 145       }
 146    }
 147
 148    pipe_transfer_unmap(pipe, transfer);
 149    pipe->transfer_destroy(pipe, transfer);
 150 }
 151
 152
 153
 154 #define MAX_INST 100
 155
 156 /**
 157  * Returns a fragment program which implements the current pixel transfer ops.
 158  */
 159 static struct gl_fragment_program *
 160 get_pixel_transfer_program(struct gl_context *ctx, const struct state_key *key)
 161 {
 162    struct st_context *st = st_context(ctx);
 163    struct prog_instruction inst[MAX_INST];
 164    struct gl_program_parameter_list *params;
 165    struct gl_fragment_program *fp;
 166    GLuint ic = 0;
 167    const GLuint colorTemp = 0;
 168
 169    fp = (struct gl_fragment_program *)
 170       ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
 171    if (!fp)
 172       return NULL;
 173
 174    params = _mesa_new_parameter_list();
 175
 176    /*
 177     * Get initial pixel color from the texture.
 178     * TEX colorTemp, fragment.texcoord[0], texture[0], 2D;
 179     */
 180    _mesa_init_instructions(inst + ic, 1);
 181    inst[ic].Opcode = OPCODE_TEX;
 182    inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 183    inst[ic].DstReg.Index = colorTemp;
 184    inst[ic].SrcReg[0].File = PROGRAM_INPUT;
 185    inst[ic].SrcReg[0].Index = FRAG_ATTRIB_TEX0;
 186    inst[ic].TexSrcUnit = 0;
 187    inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 188    ic++;
 189    fp->Base.InputsRead = (1 << FRAG_ATTRIB_TEX0);
 190    fp->Base.OutputsWritten = BITFIELD64_BIT(FRAG_RESULT_COLOR);
 191    fp->Base.SamplersUsed = 0x1;  /* sampler 0 (bit 0) is used */
 192
 193    if (key->scaleAndBias) {
 194       static const gl_state_index scale_state[STATE_LENGTH] =
 195          { STATE_INTERNAL, STATE_PT_SCALE, 0, 0, 0 };
 196       static const gl_state_index bias_state[STATE_LENGTH] =
 197          { STATE_INTERNAL, STATE_PT_BIAS, 0, 0, 0 };
 198       GLint scale_p, bias_p;
 199
 200       scale_p = _mesa_add_state_reference(params, scale_state);
 201       bias_p = _mesa_add_state_reference(params, bias_state);
 202
 203       /* MAD colorTemp, colorTemp, scale, bias; */
 204       _mesa_init_instructions(inst + ic, 1);
 205       inst[ic].Opcode = OPCODE_MAD;
 206       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 207       inst[ic].DstReg.Index = colorTemp;
 208       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 209       inst[ic].SrcReg[0].Index = colorTemp;
 210       inst[ic].SrcReg[1].File = PROGRAM_STATE_VAR;
 211       inst[ic].SrcReg[1].Index = scale_p;
 212       inst[ic].SrcReg[2].File = PROGRAM_STATE_VAR;
 213       inst[ic].SrcReg[2].Index = bias_p;
 214       ic++;
 215    }
 216
 217    if (key->pixelMaps) {
 218       const GLuint temp = 1;
 219
 220       /* create the colormap/texture now if not already done */
 221       if (!st->pixel_xfer.pixelmap_texture) {
 222          st->pixel_xfer.pixelmap_texture = create_color_map_texture(ctx);
 223          st->pixel_xfer.pixelmap_sampler_view =
 224             st_create_texture_sampler_view(st->pipe,
 225                                            st->pixel_xfer.pixelmap_texture);
 226       }
 227
 228       /* with a little effort, we can do four pixel map look-ups with
 229        * two TEX instructions:
 230        */
 231
 232       /* TEX temp.rg, colorTemp.rgba, texture[1], 2D; */
 233       _mesa_init_instructions(inst + ic, 1);
 234       inst[ic].Opcode = OPCODE_TEX;
 235       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 236       inst[ic].DstReg.Index = temp;
 237       inst[ic].DstReg.WriteMask = WRITEMASK_XY; /* write R,G */
 238       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 239       inst[ic].SrcReg[0].Index = colorTemp;
 240       inst[ic].TexSrcUnit = 1;
 241       inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 242       ic++;
 243
 244       /* TEX temp.ba, colorTemp.baba, texture[1], 2D; */
 245       _mesa_init_instructions(inst + ic, 1);
 246       inst[ic].Opcode = OPCODE_TEX;
 247       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 248       inst[ic].DstReg.Index = temp;
 249       inst[ic].DstReg.WriteMask = WRITEMASK_ZW; /* write B,A */
 250       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 251       inst[ic].SrcReg[0].Index = colorTemp;
 252       inst[ic].SrcReg[0].Swizzle = MAKE_SWIZZLE4(SWIZZLE_Z, SWIZZLE_W,
 253                                                  SWIZZLE_Z, SWIZZLE_W);
 254       inst[ic].TexSrcUnit = 1;
 255       inst[ic].TexSrcTarget = TEXTURE_2D_INDEX;
 256       ic++;
 257
 258       /* MOV colorTemp, temp; */
 259       _mesa_init_instructions(inst + ic, 1);
 260       inst[ic].Opcode = OPCODE_MOV;
 261       inst[ic].DstReg.File = PROGRAM_TEMPORARY;
 262       inst[ic].DstReg.Index = colorTemp;
 263       inst[ic].SrcReg[0].File = PROGRAM_TEMPORARY;
 264       inst[ic].SrcReg[0].Index = temp;
 265       ic++;
 266
 267       fp->Base.SamplersUsed |= (1 << 1);  /* sampler 1 is used */
 268    }
 269
 270    /* Modify last instruction's dst reg to write to result.color */
 271    {
 272       struct prog_instruction *last = &inst[ic - 1];
 273       last->DstReg.File = PROGRAM_OUTPUT;
 274       last->DstReg.Index = FRAG_RESULT_COLOR;
 275    }
 276
 277    /* END; */
 278    _mesa_init_instructions(inst + ic, 1);
 279    inst[ic].Opcode = OPCODE_END;
 280    ic++;
 281
 282    assert(ic <= MAX_INST);
 283
 284
 285    fp->Base.Instructions = _mesa_alloc_instructions(ic);
 286    if (!fp->Base.Instructions) {
 287       _mesa_error(ctx, GL_OUT_OF_MEMORY,
 288                   "generating pixel transfer program");
 289       return NULL;
 290    }
 291
 292    _mesa_copy_instructions(fp->Base.Instructions, inst, ic);
 293    fp->Base.NumInstructions = ic;
 294    fp->Base.Parameters = params;
 295
 296 #if 0
 297    printf("========= pixel transfer prog\n");
 298    _mesa_print_program(&fp->Base);
 299    _mesa_print_parameter_list(fp->Base.Parameters);
 300 #endif
 301
 302    return fp;
 303 }
 304
 305
 306
 307 /**
 308  * Update st->pixel_xfer.program in response to new pixel-transfer state.
 309  */
 310 static void
 311 update_pixel_transfer(struct st_context *st)
 312 {
 313    struct gl_context *ctx = st->ctx;
 314    struct state_key key;
 315    struct gl_fragment_program *fp;
 316
 317    make_state_key(st->ctx, &key);
 318
 319    fp = (struct gl_fragment_program *)
 320       _mesa_search_program_cache(st->pixel_xfer.cache, &key, sizeof(key));
 321    if (!fp) {
 322       fp = get_pixel_transfer_program(st->ctx, &key);
 323       _mesa_program_cache_insert(st->ctx, st->pixel_xfer.cache,
 324                                  &key, sizeof(key), &fp->Base);
 325    }
 326
 327    if (ctx->Pixel.MapColorFlag) {
 328       load_color_map_texture(ctx, st->pixel_xfer.pixelmap_texture);
 329    }
 330    st->pixel_xfer.pixelmap_enabled = ctx->Pixel.MapColorFlag;
 331
 332    st->pixel_xfer.program = (struct st_fragment_program *) fp;
 333 }
 334
 335
 336
 337 const struct st_tracked_state st_update_pixel_transfer = {
 338    "st_update_pixel_transfer",                          /* name */
 339    {                                                    /* dirty */
 340       _NEW_PIXEL,                                       /* mesa */
 341       0,                                                /* st */
 342    },
 343    update_pixel_transfer                                /* update */
 344 };