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_surface *acc_ps,
  67                   uint x, uint y, uint w, uint h, float *p)
  68 {
  69    const enum pipe_format f = acc_ps->format;
  70    const struct pipe_format_block b = acc_ps->block;
  71
  72    acc_ps->format = DEFAULT_ACCUM_PIPE_FORMAT;
  73    acc_ps->block.size = 8;
  74    acc_ps->block.width = 1;
  75    acc_ps->block.height = 1;
  76
  77    pipe_get_tile_rgba(acc_ps, x, y, w, h, p);
  78
  79    acc_ps->format = f;
  80    acc_ps->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_surface *acc_ps,
  91                   uint x, uint y, uint w, uint h, const float *p)
  92 {
  93    enum pipe_format f = acc_ps->format;
  94    const struct pipe_format_block b = acc_ps->block;
  95
  96    acc_ps->format = DEFAULT_ACCUM_PIPE_FORMAT;
  97    acc_ps->block.size = 8;
  98    acc_ps->block.width = 1;
  99    acc_ps->block.height = 1;
 100
 101    pipe_put_tile_rgba(acc_ps, x, y, w, h, p);
 102
 103    acc_ps->format = f;
 104    acc_ps->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_surface *acc_ps;
 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_ps = screen->get_tex_surface(screen, acc_strb->texture, 0, 0, 0,
 122                                     PIPE_BUFFER_USAGE_CPU_WRITE);
 123    map = screen->surface_map(screen, acc_ps,
 124                              PIPE_BUFFER_USAGE_CPU_WRITE);
 125
 126    /* note acc_strb->format might not equal acc_ps->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 + (ypos + i) * acc_ps->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->surface_unmap(screen, acc_ps);
 152    pipe_surface_reference(&acc_ps, NULL);
 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_surface *acc_ps = acc_strb->surface;
 164    GLubyte *map;
 165
 166    map = screen->surface_map(screen, acc_ps,
 167                              PIPE_BUFFER_USAGE_CPU_WRITE);
 168
 169    /* note acc_strb->format might not equal acc_ps->format */
 170    switch (acc_strb->format) {
 171    case PIPE_FORMAT_R16G16B16A16_SNORM:
 172       {
 173          int i, j;
 174          for (i = 0; i < height; i++) {
 175             GLshort *acc = (GLshort *) (map + (ypos + i) * acc_ps->stride + xpos * 8);
 176             for (j = 0; j < width * 4; j++) {
 177                float val = SHORT_TO_FLOAT(acc[j]) * scale + bias;
 178                acc[j] = FLOAT_TO_SHORT(val);
 179             }
 180          }
 181       }
 182       break;
 183    default:
 184       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 185    }
 186
 187    screen->surface_unmap(screen, acc_ps);
 188 }
 189
 190
 191 static void
 192 accum_accum(struct pipe_context *pipe, GLfloat value,
 193             GLint xpos, GLint ypos, GLint width, GLint height,
 194             struct st_renderbuffer *acc_strb,
 195             struct st_renderbuffer *color_strb)
 196 {
 197    struct pipe_screen *screen = pipe->screen;
 198    struct pipe_surface *acc_surf, *color_surf;
 199    GLfloat *colorBuf, *accBuf;
 200    GLint i;
 201
 202    acc_surf = screen->get_tex_surface(screen, acc_strb->texture, 0, 0, 0,
 203                                       (PIPE_BUFFER_USAGE_CPU_WRITE |
 204                                        PIPE_BUFFER_USAGE_CPU_READ));
 205
 206    color_surf = screen->get_tex_surface(screen, color_strb->texture, 0, 0, 0,
 207                                         PIPE_BUFFER_USAGE_CPU_READ);
 208
 209    colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 210    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 211
 212    pipe_get_tile_rgba(color_surf, xpos, ypos, width, height, colorBuf);
 213    acc_get_tile_rgba(pipe, acc_surf, xpos, ypos, width, height, accBuf);
 214
 215    for (i = 0; i < 4 * width * height; i++) {
 216       accBuf[i] = accBuf[i] + colorBuf[i] * value;
 217    }
 218
 219    acc_put_tile_rgba(pipe, acc_surf, xpos, ypos, width, height, accBuf);
 220
 221    free(colorBuf);
 222    free(accBuf);
 223    pipe_surface_reference(&acc_surf, NULL);
 224    pipe_surface_reference(&color_surf, NULL);
 225 }
 226
 227
 228 static void
 229 accum_load(struct pipe_context *pipe, GLfloat value,
 230            GLint xpos, GLint ypos, GLint width, GLint height,
 231            struct st_renderbuffer *acc_strb,
 232            struct st_renderbuffer *color_strb)
 233 {
 234    struct pipe_screen *screen = pipe->screen;
 235    struct pipe_surface *acc_surf, *color_surf;
 236    GLfloat *buf;
 237    GLint i;
 238
 239    acc_surf = screen->get_tex_surface(screen, acc_strb->texture, 0, 0, 0,
 240                                       PIPE_BUFFER_USAGE_CPU_WRITE);
 241
 242    color_surf = screen->get_tex_surface(screen, color_strb->texture, 0, 0, 0,
 243                                         PIPE_BUFFER_USAGE_CPU_READ);
 244
 245    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 246
 247    pipe_get_tile_rgba(color_surf, xpos, ypos, width, height, buf);
 248
 249    for (i = 0; i < 4 * width * height; i++) {
 250       buf[i] = buf[i] * value;
 251    }
 252
 253    acc_put_tile_rgba(pipe, acc_surf, xpos, ypos, width, height, buf);
 254
 255    free(buf);
 256    pipe_surface_reference(&acc_surf, NULL);
 257    pipe_surface_reference(&color_surf, NULL);
 258 }
 259
 260
 261 static void
 262 accum_return(GLcontext *ctx, GLfloat value,
 263              GLint xpos, GLint ypos, GLint width, GLint height,
 264              struct st_renderbuffer *acc_strb,
 265              struct st_renderbuffer *color_strb)
 266 {
 267    struct pipe_context *pipe = ctx->st->pipe;
 268    struct pipe_screen *screen = pipe->screen;
 269    const GLubyte *colormask = ctx->Color.ColorMask;
 270    struct pipe_surface *acc_surf, *color_surf;
 271    GLfloat *abuf, *cbuf = NULL;
 272    GLint i, ch;
 273
 274    abuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 275
 276    acc_surf = screen->get_tex_surface(screen, acc_strb->texture, 0, 0, 0,
 277                                       PIPE_BUFFER_USAGE_CPU_READ);
 278
 279    color_surf = screen->get_tex_surface(screen, color_strb->texture, 0, 0, 0,
 280                                         (PIPE_BUFFER_USAGE_CPU_READ |
 281                                          PIPE_BUFFER_USAGE_CPU_WRITE));
 282
 283    acc_get_tile_rgba(pipe, acc_surf, xpos, ypos, width, height, abuf);
 284
 285    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
 286       cbuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 287       pipe_get_tile_rgba(color_surf, xpos, ypos, width, height, cbuf);
 288    }
 289
 290    for (i = 0; i < width * height; i++) {
 291       for (ch = 0; ch < 4; ch++) {
 292          if (colormask[ch]) {
 293             GLfloat val = abuf[i * 4 + ch] * value;
 294             abuf[i * 4 + ch] = CLAMP(val, 0.0f, 1.0f);
 295          }
 296          else {
 297             abuf[i * 4 + ch] = cbuf[i * 4 + ch];
 298          }
 299       }
 300    }
 301
 302    pipe_put_tile_rgba(color_surf, xpos, ypos, width, height, abuf);
 303
 304    free(abuf);
 305    if (cbuf)
 306       free(cbuf);
 307    pipe_surface_reference(&acc_surf, NULL);
 308    pipe_surface_reference(&color_surf, NULL);
 309 }
 310
 311
 312 static void
 313 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 314 {
 315    struct st_context *st = ctx->st;
 316    struct pipe_context *pipe = st->pipe;
 317    struct st_renderbuffer *acc_strb
 318      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 319    struct st_renderbuffer *color_strb
 320       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 321
 322    const GLint xpos = ctx->DrawBuffer->_Xmin;
 323    const GLint ypos = ctx->DrawBuffer->_Ymin;
 324    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 325    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 326
 327    /* make sure color bufs aren't cached */
 328    st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
 329
 330    switch (op) {
 331    case GL_ADD:
 332       if (value != 0.0F) {
 333          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 334       }
 335       break;
 336    case GL_MULT:
 337       if (value != 1.0F) {
 338          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 339       }
 340       break;
 341    case GL_ACCUM:
 342       if (value != 0.0F) {
 343          accum_accum(pipe, value, xpos, ypos, width, height, acc_strb, color_strb);
 344       }
 345       break;
 346    case GL_LOAD:
 347       accum_load(pipe, value, xpos, ypos, width, height, acc_strb, color_strb);
 348       break;
 349    case GL_RETURN:
 350       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 351       break;
 352    default:
 353       assert(0);
 354    }
 355 }
 356
 357
 358
 359 void st_init_accum_functions(struct dd_function_table *functions)
 360 {
 361    functions->Accum = st_Accum;
 362 }