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 #include "main/mfeatures.h"
  37
  38 #include "st_debug.h"
  39 #include "st_context.h"
  40 #include "st_cb_accum.h"
  41 #include "st_cb_fbo.h"
  42 #include "st_texture.h"
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_defines.h"
  45 #include "util/u_format.h"
  46 #include "util/u_inlines.h"
  47 #include "util/u_tile.h"
  48
  49
  50 #if FEATURE_accum
  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 void
  60 st_clear_accum_buffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
  61 {
  62    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  63    const GLint xpos = ctx->DrawBuffer->_Xmin;
  64    const GLint ypos = ctx->DrawBuffer->_Ymin;
  65    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
  66    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
  67    size_t stride = acc_strb->stride;
  68    GLubyte *data = acc_strb->data;
  69
  70    if(!data)
  71       return;
  72
  73    switch (acc_strb->format) {
  74    case PIPE_FORMAT_R16G16B16A16_SNORM:
  75       {
  76          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
  77          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
  78          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
  79          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
  80          int i, j;
  81          for (i = 0; i < height; i++) {
  82             GLshort *dst = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
  83             for (j = 0; j < width; j++) {
  84                dst[0] = r;
  85                dst[1] = g;
  86                dst[2] = b;
  87                dst[3] = a;
  88                dst += 4;
  89             }
  90          }
  91       }
  92       break;
  93    default:
  94       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
  95    }
  96 }
  97
  98
  99 /** For ADD/MULT */
 100 static void
 101 accum_mad(struct gl_context *ctx, GLfloat scale, GLfloat bias,
 102           GLint xpos, GLint ypos, GLint width, GLint height,
 103           struct st_renderbuffer *acc_strb)
 104 {
 105    size_t stride = acc_strb->stride;
 106    GLubyte *data = acc_strb->data;
 107
 108    switch (acc_strb->format) {
 109    case PIPE_FORMAT_R16G16B16A16_SNORM:
 110       {
 111          int i, j;
 112          for (i = 0; i < height; i++) {
 113             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 114             for (j = 0; j < width * 4; j++) {
 115                float val = SHORT_TO_FLOAT(*acc) * scale + bias;
 116                *acc++ = FLOAT_TO_SHORT(val);
 117             }
 118          }
 119       }
 120       break;
 121    default:
 122       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 123    }
 124 }
 125
 126
 127 static void
 128 accum_accum(struct st_context *st, GLfloat value,
 129             GLint xpos, GLint ypos, GLint width, GLint height,
 130             struct st_renderbuffer *acc_strb,
 131             struct st_renderbuffer *color_strb)
 132 {
 133    struct pipe_context *pipe = st->pipe;
 134    struct pipe_transfer *color_trans;
 135    size_t stride = acc_strb->stride;
 136    GLubyte *data = acc_strb->data;
 137    GLfloat *buf;
 138
 139    if (ST_DEBUG & DEBUG_FALLBACK)
 140       debug_printf("%s: fallback processing\n", __FUNCTION__);
 141
 142    color_trans = pipe_get_transfer(st->pipe,
 143                                    color_strb->texture,
 144                                    0, 0,
 145                                    PIPE_TRANSFER_READ, xpos, ypos,
 146                                    width, height);
 147
 148    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 149
 150    pipe_get_tile_rgba_format(pipe, color_trans, 0, 0, width, height,
 151                              util_format_linear(color_strb->texture->format),
 152                              buf);
 153
 154    switch (acc_strb->format) {
 155    case PIPE_FORMAT_R16G16B16A16_SNORM:
 156       {
 157          const GLfloat *color = buf;
 158          int i, j;
 159          for (i = 0; i < height; i++) {
 160             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 161             for (j = 0; j < width * 4; j++) {
 162                float val = *color++ * value;
 163                *acc++ += FLOAT_TO_SHORT(val);
 164             }
 165          }
 166       }
 167       break;
 168    default:
 169       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 170    }
 171
 172    free(buf);
 173    pipe->transfer_destroy(pipe, color_trans);
 174 }
 175
 176
 177 static void
 178 accum_load(struct st_context *st, GLfloat value,
 179            GLint xpos, GLint ypos, GLint width, GLint height,
 180            struct st_renderbuffer *acc_strb,
 181            struct st_renderbuffer *color_strb)
 182 {
 183    struct pipe_context *pipe = st->pipe;
 184    struct pipe_transfer *color_trans;
 185    size_t stride = acc_strb->stride;
 186    GLubyte *data = acc_strb->data;
 187    GLfloat *buf;
 188
 189    if (ST_DEBUG & DEBUG_FALLBACK)
 190       debug_printf("%s: fallback processing\n", __FUNCTION__);
 191
 192    color_trans = pipe_get_transfer(st->pipe, color_strb->texture,
 193                                    0, 0,
 194                                    PIPE_TRANSFER_READ, xpos, ypos,
 195                                    width, height);
 196
 197    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 198
 199    pipe_get_tile_rgba_format(pipe, color_trans, 0, 0, width, height,
 200                              util_format_linear(color_strb->texture->format),
 201                              buf);
 202
 203    switch (acc_strb->format) {
 204    case PIPE_FORMAT_R16G16B16A16_SNORM:
 205       {
 206          const GLfloat *color = buf;
 207          int i, j;
 208          for (i = 0; i < height; i++) {
 209             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 210             for (j = 0; j < width * 4; j++) {
 211                float val = *color++ * value;
 212                *acc++ = FLOAT_TO_SHORT(val);
 213             }
 214          }
 215       }
 216       break;
 217    default:
 218       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 219    }
 220
 221    free(buf);
 222    pipe->transfer_destroy(pipe, color_trans);
 223 }
 224
 225
 226 static void
 227 accum_return(struct gl_context *ctx, GLfloat value,
 228              GLint xpos, GLint ypos, GLint width, GLint height,
 229              struct st_renderbuffer *acc_strb,
 230              struct st_renderbuffer *color_strb)
 231 {
 232    struct pipe_context *pipe = st_context(ctx)->pipe;
 233    const GLubyte *colormask = ctx->Color.ColorMask[0];
 234    enum pipe_transfer_usage usage;
 235    struct pipe_transfer *color_trans;
 236    size_t stride = acc_strb->stride;
 237    const GLubyte *data = acc_strb->data;
 238    GLfloat *buf;
 239    enum pipe_format format = util_format_linear(color_strb->texture->format);
 240
 241    if (ST_DEBUG & DEBUG_FALLBACK)
 242       debug_printf("%s: fallback processing\n", __FUNCTION__);
 243
 244    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 245
 246    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3])
 247       usage = PIPE_TRANSFER_READ_WRITE;
 248    else
 249       usage = PIPE_TRANSFER_WRITE;
 250
 251    color_trans = pipe_get_transfer(st_context(ctx)->pipe,
 252                                    color_strb->texture, 0, 0,
 253                                    usage,
 254                                    xpos, ypos,
 255                                    width, height);
 256
 257    if (usage & PIPE_TRANSFER_READ)
 258       pipe_get_tile_rgba_format(pipe, color_trans, 0, 0, width, height,
 259                                 format, buf);
 260
 261    switch (acc_strb->format) {
 262    case PIPE_FORMAT_R16G16B16A16_SNORM:
 263       {
 264          GLfloat *color = buf;
 265          int i, j, ch;
 266          for (i = 0; i < height; i++) {
 267             const GLshort *acc = (const GLshort *) (data + (ypos + i) * stride + xpos * 8);
 268             for (j = 0; j < width; j++) {
 269                for (ch = 0; ch < 4; ch++) {
 270                   if (colormask[ch]) {
 271                      GLfloat val = SHORT_TO_FLOAT(*acc * value);
 272                      *color = CLAMP(val, 0.0f, 1.0f);
 273                   }
 274                   else {
 275                      /* No change */
 276                   }
 277                   ++acc;
 278                   ++color;
 279                }
 280             }
 281          }
 282       }
 283       break;
 284    default:
 285       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 286    }
 287
 288    pipe_put_tile_rgba_format(pipe, color_trans, 0, 0, width, height,
 289                              format, buf);
 290
 291    free(buf);
 292    pipe->transfer_destroy(pipe, color_trans);
 293 }
 294
 295
 296 static void
 297 st_Accum(struct gl_context *ctx, GLenum op, GLfloat value)
 298 {
 299    struct st_context *st = st_context(ctx);
 300    struct st_renderbuffer *acc_strb
 301      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 302    struct st_renderbuffer *color_strb
 303       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 304
 305    const GLint xpos = ctx->DrawBuffer->_Xmin;
 306    const GLint ypos = ctx->DrawBuffer->_Ymin;
 307    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 308    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 309
 310    if(!acc_strb->data)
 311       return;
 312
 313    switch (op) {
 314    case GL_ADD:
 315       if (value != 0.0F) {
 316          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 317       }
 318       break;
 319    case GL_MULT:
 320       if (value != 1.0F) {
 321          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 322       }
 323       break;
 324    case GL_ACCUM:
 325       if (value != 0.0F) {
 326          accum_accum(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 327       }
 328       break;
 329    case GL_LOAD:
 330       accum_load(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 331       break;
 332    case GL_RETURN:
 333       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 334       break;
 335    default:
 336       assert(0);
 337    }
 338 }
 339
 340
 341
 342 void st_init_accum_functions(struct dd_function_table *functions)
 343 {
 344    functions->Accum = st_Accum;
 345 }
 346
 347 #endif /* FEATURE_accum */