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_debug.h"
  38 #include "st_context.h"
  39 #include "st_cb_accum.h"
  40 #include "st_cb_fbo.h"
  41 #include "st_texture.h"
  42 #include "pipe/p_context.h"
  43 #include "pipe/p_defines.h"
  44 #include "util/u_inlines.h"
  45 #include "util/u_tile.h"
  46
  47
  48 /**
  49  * For hardware that supports deep color buffers, we could accelerate
  50  * most/all the accum operations with blending/texturing.
  51  * For now, just use the get/put_tile() functions and do things in software.
  52  */
  53
  54
  55 void
  56 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
  57 {
  58    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  59    const GLint xpos = ctx->DrawBuffer->_Xmin;
  60    const GLint ypos = ctx->DrawBuffer->_Ymin;
  61    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
  62    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
  63    size_t stride = acc_strb->stride;
  64    GLubyte *data = acc_strb->data;
  65
  66    if(!data)
  67       return;
  68
  69    switch (acc_strb->format) {
  70    case PIPE_FORMAT_R16G16B16A16_SNORM:
  71       {
  72          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
  73          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
  74          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
  75          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
  76          int i, j;
  77          for (i = 0; i < height; i++) {
  78             GLshort *dst = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
  79             for (j = 0; j < width; j++) {
  80                dst[0] = r;
  81                dst[1] = g;
  82                dst[2] = b;
  83                dst[3] = a;
  84                dst += 4;
  85             }
  86          }
  87       }
  88       break;
  89    default:
  90       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
  91    }
  92 }
  93
  94
  95 /** For ADD/MULT */
  96 static void
  97 accum_mad(GLcontext *ctx, GLfloat scale, GLfloat bias,
  98           GLint xpos, GLint ypos, GLint width, GLint height,
  99           struct st_renderbuffer *acc_strb)
 100 {
 101    size_t stride = acc_strb->stride;
 102    GLubyte *data = acc_strb->data;
 103
 104    switch (acc_strb->format) {
 105    case PIPE_FORMAT_R16G16B16A16_SNORM:
 106       {
 107          int i, j;
 108          for (i = 0; i < height; i++) {
 109             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 110             for (j = 0; j < width * 4; j++) {
 111                float val = SHORT_TO_FLOAT(*acc) * scale + bias;
 112                *acc++ = FLOAT_TO_SHORT(val);
 113             }
 114          }
 115       }
 116       break;
 117    default:
 118       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 119    }
 120 }
 121
 122
 123 static void
 124 accum_accum(struct st_context *st, GLfloat value,
 125             GLint xpos, GLint ypos, GLint width, GLint height,
 126             struct st_renderbuffer *acc_strb,
 127             struct st_renderbuffer *color_strb)
 128 {
 129    struct pipe_context *pipe = st->pipe;
 130    struct pipe_transfer *color_trans;
 131    size_t stride = acc_strb->stride;
 132    GLubyte *data = acc_strb->data;
 133    GLfloat *buf;
 134
 135    if (ST_DEBUG & DEBUG_FALLBACK)
 136       debug_printf("%s: fallback processing\n", __FUNCTION__);
 137
 138    color_trans = pipe_get_transfer(st->pipe,
 139                                                 color_strb->texture,
 140                                                 0, 0, 0,
 141                                                 PIPE_TRANSFER_READ, xpos, ypos,
 142                                                 width, height);
 143
 144    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 145
 146    pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 147
 148    switch (acc_strb->format) {
 149    case PIPE_FORMAT_R16G16B16A16_SNORM:
 150       {
 151          const GLfloat *color = buf;
 152          int i, j;
 153          for (i = 0; i < height; i++) {
 154             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 155             for (j = 0; j < width * 4; j++) {
 156                float val = *color++ * value;
 157                *acc++ += FLOAT_TO_SHORT(val);
 158             }
 159          }
 160       }
 161       break;
 162    default:
 163       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 164    }
 165
 166    free(buf);
 167    pipe->transfer_destroy(pipe, color_trans);
 168 }
 169
 170
 171 static void
 172 accum_load(struct st_context *st, GLfloat value,
 173            GLint xpos, GLint ypos, GLint width, GLint height,
 174            struct st_renderbuffer *acc_strb,
 175            struct st_renderbuffer *color_strb)
 176 {
 177    struct pipe_context *pipe = st->pipe;
 178    struct pipe_transfer *color_trans;
 179    size_t stride = acc_strb->stride;
 180    GLubyte *data = acc_strb->data;
 181    GLfloat *buf;
 182
 183
 184    if (ST_DEBUG & DEBUG_FALLBACK)
 185       debug_printf("%s: fallback processing\n", __FUNCTION__);
 186
 187    color_trans = pipe_get_transfer(st->pipe, color_strb->texture,
 188                                                 0, 0, 0,
 189                                                 PIPE_TRANSFER_READ, xpos, ypos,
 190                                                 width, height);
 191
 192    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 193
 194    pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 195
 196    switch (acc_strb->format) {
 197    case PIPE_FORMAT_R16G16B16A16_SNORM:
 198       {
 199          const GLfloat *color = buf;
 200          int i, j;
 201          for (i = 0; i < height; i++) {
 202             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 203             for (j = 0; j < width * 4; j++) {
 204                float val = *color++ * value;
 205                *acc++ = FLOAT_TO_SHORT(val);
 206             }
 207          }
 208       }
 209       break;
 210    default:
 211       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 212    }
 213
 214    free(buf);
 215    pipe->transfer_destroy(pipe, color_trans);
 216 }
 217
 218
 219 static void
 220 accum_return(GLcontext *ctx, GLfloat value,
 221              GLint xpos, GLint ypos, GLint width, GLint height,
 222              struct st_renderbuffer *acc_strb,
 223              struct st_renderbuffer *color_strb)
 224 {
 225    struct pipe_context *pipe = st_context(ctx)->pipe;
 226    const GLubyte *colormask = ctx->Color.ColorMask[0];
 227    enum pipe_transfer_usage usage;
 228    struct pipe_transfer *color_trans;
 229    size_t stride = acc_strb->stride;
 230    const GLubyte *data = acc_strb->data;
 231    GLfloat *buf;
 232
 233    if (ST_DEBUG & DEBUG_FALLBACK)
 234       debug_printf("%s: fallback processing\n", __FUNCTION__);
 235
 236    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 237
 238    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3])
 239       usage = PIPE_TRANSFER_READ_WRITE;
 240    else
 241       usage = PIPE_TRANSFER_WRITE;
 242
 243    color_trans = pipe_get_transfer(st_context(ctx)->pipe,
 244                                                 color_strb->texture, 0, 0, 0,
 245                                                 usage,
 246                                                 xpos, ypos,
 247                                                 width, height);
 248
 249    if (usage & PIPE_TRANSFER_READ)
 250       pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 251
 252    switch (acc_strb->format) {
 253    case PIPE_FORMAT_R16G16B16A16_SNORM:
 254       {
 255          GLfloat *color = buf;
 256          int i, j, ch;
 257          for (i = 0; i < height; i++) {
 258             const GLshort *acc = (const GLshort *) (data + (ypos + i) * stride + xpos * 8);
 259             for (j = 0; j < width; j++) {
 260                for (ch = 0; ch < 4; ch++) {
 261                   if (colormask[ch]) {
 262                      GLfloat val = SHORT_TO_FLOAT(*acc * value);
 263                      *color = CLAMP(val, 0.0f, 1.0f);
 264                   }
 265                   else {
 266                      /* No change */
 267                   }
 268                   ++acc;
 269                   ++color;
 270                }
 271             }
 272          }
 273       }
 274       break;
 275    default:
 276       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 277    }
 278
 279    pipe_put_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 280
 281    free(buf);
 282    pipe->transfer_destroy(pipe, color_trans);
 283 }
 284
 285
 286 static void
 287 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 288 {
 289    struct st_context *st = st_context(ctx);
 290    struct st_renderbuffer *acc_strb
 291      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 292    struct st_renderbuffer *color_strb
 293       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 294
 295    const GLint xpos = ctx->DrawBuffer->_Xmin;
 296    const GLint ypos = ctx->DrawBuffer->_Ymin;
 297    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 298    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 299
 300    if(!acc_strb->data)
 301       return;
 302
 303    switch (op) {
 304    case GL_ADD:
 305       if (value != 0.0F) {
 306          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 307       }
 308       break;
 309    case GL_MULT:
 310       if (value != 1.0F) {
 311          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 312       }
 313       break;
 314    case GL_ACCUM:
 315       if (value != 0.0F) {
 316          accum_accum(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 317       }
 318       break;
 319    case GL_LOAD:
 320       accum_load(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 321       break;
 322    case GL_RETURN:
 323       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 324       break;
 325    default:
 326       assert(0);
 327    }
 328 }
 329
 330
 331
 332 void st_init_accum_functions(struct dd_function_table *functions)
 333 {
 334    functions->Accum = st_Accum;
 335 }