src/mesa/state_tracker/st_cb_accum.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   * Authors:
  30   *   Brian Paul
  31   */
  32
  33 #include "main/imports.h"
  34 #include "main/image.h"
  35 #include "main/macros.h"
  36
  37 #include "st_context.h"
  38 #include "st_cb_accum.h"
  39 #include "st_cb_fbo.h"
  40 #include "st_draw.h"
  41 #include "st_public.h"
  42 #include "st_format.h"
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_defines.h"
  45 #include "pipe/p_inlines.h"
  46 #include "util/u_tile.h"
  47
  48
  49 #define UNCLAMPED_FLOAT_TO_SHORT(us, f)  \
  50    us = ( (short) ( CLAMP((f), -1.0, 1.0) * 32767.0F) )
  51
  52
  53 /**
  54  * For hardware that supports deep color buffers, we could accelerate
  55  * most/all the accum operations with blending/texturing.
  56  * For now, just use the get/put_tile() functions and do things in software.
  57  */
  58
  59
  60 /**
  61  * Wrapper for pipe_get_tile_rgba().  Do format/cpp override to make the
  62  * tile util function think the surface is 16bit/channel, even if it's not.
  63  * See also: st_renderbuffer_alloc_storage()
  64  */
  65 static void
  66 acc_get_tile_rgba(struct pipe_context *pipe, struct pipe_transfer *acc_pt,
  67                   uint x, uint y, uint w, uint h, float *p)
  68 {
  69    const enum pipe_format f = acc_pt->format;
  70    const struct pipe_format_block b = acc_pt->block;
  71
  72    acc_pt->format = DEFAULT_ACCUM_PIPE_FORMAT;
  73    acc_pt->block.size = 8;
  74    acc_pt->block.width = 1;
  75    acc_pt->block.height = 1;
  76
  77    pipe_get_tile_rgba(acc_pt, x, y, w, h, p);
  78
  79    acc_pt->format = f;
  80    acc_pt->block = b;
  81 }
  82
  83
  84 /**
  85  * Wrapper for pipe_put_tile_rgba().  Do format/cpp override to make the
  86  * tile util function think the surface is 16bit/channel, even if it's not.
  87  * See also: st_renderbuffer_alloc_storage()
  88  */
  89 static void
  90 acc_put_tile_rgba(struct pipe_context *pipe, struct pipe_transfer *acc_pt,
  91                   uint x, uint y, uint w, uint h, const float *p)
  92 {
  93    enum pipe_format f = acc_pt->format;
  94    const struct pipe_format_block b = acc_pt->block;
  95
  96    acc_pt->format = DEFAULT_ACCUM_PIPE_FORMAT;
  97    acc_pt->block.size = 8;
  98    acc_pt->block.width = 1;
  99    acc_pt->block.height = 1;
 100
 101    pipe_put_tile_rgba(acc_pt, x, y, w, h, p);
 102
 103    acc_pt->format = f;
 104    acc_pt->block = b;
 105 }
 106
 107
 108
 109 void
 110 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
 111 {
 112    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
 113    struct pipe_transfer *acc_pt;
 114    struct pipe_screen *screen = ctx->st->pipe->screen;
 115    const GLint xpos = ctx->DrawBuffer->_Xmin;
 116    const GLint ypos = ctx->DrawBuffer->_Ymin;
 117    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 118    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 119    GLubyte *map;
 120
 121    acc_pt = screen->get_tex_transfer(screen, acc_strb->texture, 0, 0, 0,
 122                                      PIPE_TRANSFER_WRITE, xpos, ypos,
 123                                      width, height);
 124    map = screen->transfer_map(screen, acc_pt);
 125
 126    /* note acc_strb->format might not equal acc_pt->format */
 127    switch (acc_strb->format) {
 128    case PIPE_FORMAT_R16G16B16A16_SNORM:
 129       {
 130          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
 131          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
 132          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
 133          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
 134          int i, j;
 135          for (i = 0; i < height; i++) {
 136             GLshort *dst = (GLshort *) (map + i * acc_pt->stride + xpos * 8);
 137             for (j = 0; j < width; j++) {
 138                dst[0] = r;
 139                dst[1] = g;
 140                dst[2] = b;
 141                dst[3] = a;
 142                dst += 4;
 143             }
 144          }
 145       }
 146       break;
 147    default:
 148       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
 149    }
 150
 151    screen->transfer_unmap(screen, acc_pt);
 152    screen->tex_transfer_release(screen, &acc_pt);
 153 }
 154
 155
 156 /** For ADD/MULT */
 157 static void
 158 accum_mad(GLcontext *ctx, GLfloat scale, GLfloat bias,
 159           GLint xpos, GLint ypos, GLint width, GLint height,
 160           struct st_renderbuffer *acc_strb)
 161 {
 162    struct pipe_screen *screen = ctx->st->pipe->screen;
 163    struct pipe_transfer *acc_pt;
 164    GLubyte *map;
 165
 166    acc_pt = screen->get_tex_transfer(screen, acc_strb->texture, 0, 0, 0,
 167                                      PIPE_TRANSFER_READ_WRITE, xpos, ypos,
 168                                      width, height);
 169    map = screen->transfer_map(screen, acc_pt);
 170
 171    /* note acc_strb->format might not equal acc_pt->format */
 172    switch (acc_strb->format) {
 173    case PIPE_FORMAT_R16G16B16A16_SNORM:
 174       {
 175          int i, j;
 176          for (i = 0; i < height; i++) {
 177             GLshort *acc = (GLshort *) (map + (ypos + i) * acc_pt->stride + xpos * 8);
 178             for (j = 0; j < width * 4; j++) {
 179                float val = SHORT_TO_FLOAT(acc[j]) * scale + bias;
 180                acc[j] = FLOAT_TO_SHORT(val);
 181             }
 182          }
 183       }
 184       break;
 185    default:
 186       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 187    }
 188
 189    screen->transfer_unmap(screen, acc_pt);
 190    screen->tex_transfer_release(screen, &acc_pt);
 191 }
 192
 193
 194 static void
 195 accum_accum(struct pipe_context *pipe, GLfloat value,
 196             GLint xpos, GLint ypos, GLint width, GLint height,
 197             struct st_renderbuffer *acc_strb,
 198             struct st_renderbuffer *color_strb)
 199 {
 200    struct pipe_screen *screen = pipe->screen;
 201    struct pipe_transfer *acc_trans, *color_trans;
 202    GLfloat *colorBuf, *accBuf;
 203    GLint i;
 204
 205    acc_trans = screen->get_tex_transfer(screen, acc_strb->texture, 0, 0, 0,
 206                                         PIPE_TRANSFER_READ, xpos, ypos,
 207                                         width, height);
 208
 209    color_trans = screen->get_tex_transfer(screen, color_strb->texture, 0, 0, 0,
 210                                           PIPE_TRANSFER_READ, xpos, ypos,
 211                                           width, height);
 212
 213    colorBuf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 214    accBuf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 215
 216    pipe_get_tile_rgba(color_trans, 0, 0, width, height, colorBuf);
 217    acc_get_tile_rgba(pipe, acc_trans, 0, 0, width, height, accBuf);
 218
 219    for (i = 0; i < 4 * width * height; i++) {
 220       accBuf[i] = accBuf[i] + colorBuf[i] * value;
 221    }
 222
 223    screen->tex_transfer_release(screen, &acc_trans);
 224    acc_trans = screen->get_tex_transfer(screen, acc_strb->texture, 0, 0, 0,
 225                                         PIPE_TRANSFER_WRITE, xpos, ypos,
 226                                         width, height);
 227
 228    acc_put_tile_rgba(pipe, acc_trans, 0, 0, width, height, accBuf);
 229
 230    _mesa_free(colorBuf);
 231    _mesa_free(accBuf);
 232    screen->tex_transfer_release(screen, &acc_trans);
 233    screen->tex_transfer_release(screen, &color_trans);
 234 }
 235
 236
 237 static void
 238 accum_load(struct pipe_context *pipe, GLfloat value,
 239            GLint xpos, GLint ypos, GLint width, GLint height,
 240            struct st_renderbuffer *acc_strb,
 241            struct st_renderbuffer *color_strb)
 242 {
 243    struct pipe_screen *screen = pipe->screen;
 244    struct pipe_transfer *acc_trans, *color_trans;
 245    GLfloat *buf;
 246    GLint i;
 247
 248    acc_trans = screen->get_tex_transfer(screen, acc_strb->texture, 0, 0, 0,
 249                                         PIPE_TRANSFER_WRITE, xpos, ypos,
 250                                         width, height);
 251
 252    color_trans = screen->get_tex_transfer(screen, color_strb->texture, 0, 0, 0,
 253                                         PIPE_TRANSFER_READ, xpos, ypos,
 254                                         width, height);
 255
 256    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 257
 258    pipe_get_tile_rgba(color_trans, 0, 0, width, height, buf);
 259
 260    for (i = 0; i < 4 * width * height; i++) {
 261       buf[i] = buf[i] * value;
 262    }
 263
 264    acc_put_tile_rgba(pipe, acc_trans, 0, 0, width, height, buf);
 265
 266    _mesa_free(buf);
 267    screen->tex_transfer_release(screen, &acc_trans);
 268    screen->tex_transfer_release(screen, &color_trans);
 269 }
 270
 271
 272 static void
 273 accum_return(GLcontext *ctx, GLfloat value,
 274              GLint xpos, GLint ypos, GLint width, GLint height,
 275              struct st_renderbuffer *acc_strb,
 276              struct st_renderbuffer *color_strb)
 277 {
 278    struct pipe_context *pipe = ctx->st->pipe;
 279    struct pipe_screen *screen = pipe->screen;
 280    const GLubyte *colormask = ctx->Color.ColorMask;
 281    struct pipe_transfer *acc_trans, *color_trans;
 282    GLfloat *abuf, *cbuf = NULL;
 283    GLint i, ch;
 284
 285    abuf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 286
 287    acc_trans = screen->get_tex_transfer(screen, acc_strb->texture, 0, 0, 0,
 288                                         PIPE_TRANSFER_READ, xpos, ypos,
 289                                         width, height);
 290
 291    color_trans = screen->get_tex_transfer(screen, color_strb->texture, 0, 0, 0,
 292                                           PIPE_TRANSFER_READ_WRITE, xpos, ypos,
 293                                           width, height);
 294
 295    acc_get_tile_rgba(pipe, acc_trans, 0, 0, width, height, abuf);
 296
 297    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
 298       cbuf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 299       pipe_get_tile_rgba(color_trans, 0, 0, width, height, cbuf);
 300    }
 301
 302    for (i = 0; i < width * height; i++) {
 303       for (ch = 0; ch < 4; ch++) {
 304          if (colormask[ch]) {
 305             GLfloat val = abuf[i * 4 + ch] * value;
 306             abuf[i * 4 + ch] = CLAMP(val, 0.0f, 1.0f);
 307          }
 308          else {
 309             abuf[i * 4 + ch] = cbuf[i * 4 + ch];
 310          }
 311       }
 312    }
 313
 314    pipe_put_tile_rgba(color_trans, 0, 0, width, height, abuf);
 315
 316    _mesa_free(abuf);
 317    if (cbuf)
 318       _mesa_free(cbuf);
 319    screen->tex_transfer_release(screen, &acc_trans);
 320    screen->tex_transfer_release(screen, &color_trans);
 321 }
 322
 323
 324 static void
 325 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 326 {
 327    struct st_context *st = ctx->st;
 328    struct pipe_context *pipe = st->pipe;
 329    struct st_renderbuffer *acc_strb
 330      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 331    struct st_renderbuffer *color_strb
 332       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 333
 334    const GLint xpos = ctx->DrawBuffer->_Xmin;
 335    const GLint ypos = ctx->DrawBuffer->_Ymin;
 336    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 337    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 338
 339    /* make sure color bufs aren't cached */
 340    st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
 341
 342    switch (op) {
 343    case GL_ADD:
 344       if (value != 0.0F) {
 345          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 346       }
 347       break;
 348    case GL_MULT:
 349       if (value != 1.0F) {
 350          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 351       }
 352       break;
 353    case GL_ACCUM:
 354       if (value != 0.0F) {
 355          accum_accum(pipe, value, xpos, ypos, width, height, acc_strb, color_strb);
 356       }
 357       break;
 358    case GL_LOAD:
 359       accum_load(pipe, value, xpos, ypos, width, height, acc_strb, color_strb);
 360       break;
 361    case GL_RETURN:
 362       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 363       break;
 364    default:
 365       assert(0);
 366    }
 367 }
 368
 369
 370
 371 void st_init_accum_functions(struct dd_function_table *functions)
 372 {
 373    functions->Accum = st_Accum;
 374 }