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