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