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 "st_texture.h"
  44 #include "st_inlines.h"
  45 #include "pipe/p_context.h"
  46 #include "pipe/p_defines.h"
  47 #include "pipe/p_inlines.h"
  48 #include "util/u_tile.h"
  49
  50
  51 /**
  52  * For hardware that supports deep color buffers, we could accelerate
  53  * most/all the accum operations with blending/texturing.
  54  * For now, just use the get/put_tile() functions and do things in software.
  55  */
  56
  57
  58 void
  59 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
  60 {
  61    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  62    const GLint xpos = ctx->DrawBuffer->_Xmin;
  63    const GLint ypos = ctx->DrawBuffer->_Ymin;
  64    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
  65    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
  66    size_t stride = acc_strb->stride;
  67    GLubyte *data = acc_strb->data;
  68
  69    if(!data)
  70       return;
  71
  72    switch (acc_strb->format) {
  73    case PIPE_FORMAT_R16G16B16A16_SNORM:
  74       {
  75          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
  76          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
  77          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
  78          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
  79          int i, j;
  80          for (i = 0; i < height; i++) {
  81             GLshort *dst = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
  82             for (j = 0; j < width; j++) {
  83                dst[0] = r;
  84                dst[1] = g;
  85                dst[2] = b;
  86                dst[3] = a;
  87                dst += 4;
  88             }
  89          }
  90       }
  91       break;
  92    default:
  93       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
  94    }
  95 }
  96
  97
  98 /** For ADD/MULT */
  99 static void
 100 accum_mad(GLcontext *ctx, GLfloat scale, GLfloat bias,
 101           GLint xpos, GLint ypos, GLint width, GLint height,
 102           struct st_renderbuffer *acc_strb)
 103 {
 104    size_t stride = acc_strb->stride;
 105    GLubyte *data = acc_strb->data;
 106
 107    switch (acc_strb->format) {
 108    case PIPE_FORMAT_R16G16B16A16_SNORM:
 109       {
 110          int i, j;
 111          for (i = 0; i < height; i++) {
 112             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 113             for (j = 0; j < width * 4; j++) {
 114                float val = SHORT_TO_FLOAT(*acc) * scale + bias;
 115                *acc++ = FLOAT_TO_SHORT(val);
 116             }
 117          }
 118       }
 119       break;
 120    default:
 121       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 122    }
 123 }
 124
 125
 126 static void
 127 accum_accum(struct st_context *st, GLfloat value,
 128             GLint xpos, GLint ypos, GLint width, GLint height,
 129             struct st_renderbuffer *acc_strb,
 130             struct st_renderbuffer *color_strb)
 131 {
 132    struct pipe_context *pipe = st->pipe;
 133    struct pipe_screen *screen = pipe->screen;
 134    struct pipe_transfer *color_trans;
 135    size_t stride = acc_strb->stride;
 136    GLubyte *data = acc_strb->data;
 137    GLfloat *buf;
 138
 139    color_trans = st_cond_flush_get_tex_transfer(st, color_strb->texture,
 140                                                 0, 0, 0,
 141                                                 PIPE_TRANSFER_READ, xpos, ypos,
 142                                                 width, height);
 143
 144    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 145
 146    pipe_get_tile_rgba(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    _mesa_free(buf);
 167    screen->tex_transfer_destroy(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_screen *screen = pipe->screen;
 179    struct pipe_transfer *color_trans;
 180    size_t stride = acc_strb->stride;
 181    GLubyte *data = acc_strb->data;
 182    GLfloat *buf;
 183
 184    color_trans = st_cond_flush_get_tex_transfer(st, color_strb->texture,
 185                                                 0, 0, 0,
 186                                                 PIPE_TRANSFER_READ, xpos, ypos,
 187                                                 width, height);
 188
 189    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 190
 191    pipe_get_tile_rgba(color_trans, 0, 0, width, height, buf);
 192
 193    switch (acc_strb->format) {
 194    case PIPE_FORMAT_R16G16B16A16_SNORM:
 195       {
 196          const GLfloat *color = buf;
 197          int i, j;
 198          for (i = 0; i < height; i++) {
 199             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 200             for (j = 0; j < width * 4; j++) {
 201                float val = *color++ * value;
 202                *acc++ = FLOAT_TO_SHORT(val);
 203             }
 204          }
 205       }
 206       break;
 207    default:
 208       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 209    }
 210
 211    _mesa_free(buf);
 212    screen->tex_transfer_destroy(color_trans);
 213 }
 214
 215
 216 static void
 217 accum_return(GLcontext *ctx, GLfloat value,
 218              GLint xpos, GLint ypos, GLint width, GLint height,
 219              struct st_renderbuffer *acc_strb,
 220              struct st_renderbuffer *color_strb)
 221 {
 222    struct pipe_context *pipe = ctx->st->pipe;
 223    struct pipe_screen *screen = pipe->screen;
 224    const GLubyte *colormask = ctx->Color.ColorMask;
 225    enum pipe_transfer_usage usage;
 226    struct pipe_transfer *color_trans;
 227    size_t stride = acc_strb->stride;
 228    const GLubyte *data = acc_strb->data;
 229    GLfloat *buf;
 230
 231    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 232
 233    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3])
 234       usage = PIPE_TRANSFER_READ_WRITE;
 235    else
 236       usage = PIPE_TRANSFER_WRITE;
 237
 238    color_trans = st_cond_flush_get_tex_transfer(st_context(ctx),
 239                                                 color_strb->texture, 0, 0, 0,
 240                                                 usage,
 241                                                 xpos, ypos,
 242                                                 width, height);
 243
 244    if (usage != PIPE_TRANSFER_WRITE)
 245       pipe_get_tile_rgba(color_trans, 0, 0, width, height, buf);
 246
 247    switch (acc_strb->format) {
 248    case PIPE_FORMAT_R16G16B16A16_SNORM:
 249       {
 250          GLfloat *color = buf;
 251          int i, j, ch;
 252          for (i = 0; i < height; i++) {
 253             const GLshort *acc = (const GLshort *) (data + (ypos + i) * stride + xpos * 8);
 254             for (j = 0; j < width; j++) {
 255                for (ch = 0; ch < 4; ch++) {
 256                   if (colormask[ch]) {
 257                      GLfloat val = SHORT_TO_FLOAT(*acc * value);
 258                      *color = CLAMP(val, 0.0f, 1.0f);
 259                   }
 260                   else {
 261                      /* No change */
 262                   }
 263                   ++acc;
 264                   ++color;
 265                }
 266             }
 267          }
 268       }
 269       break;
 270    default:
 271       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 272    }
 273
 274    pipe_put_tile_rgba(color_trans, 0, 0, width, height, buf);
 275
 276    _mesa_free(buf);
 277    screen->tex_transfer_destroy(color_trans);
 278 }
 279
 280
 281 static void
 282 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 283 {
 284    struct st_context *st = ctx->st;
 285    struct st_renderbuffer *acc_strb
 286      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 287    struct st_renderbuffer *color_strb
 288       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 289
 290    const GLint xpos = ctx->DrawBuffer->_Xmin;
 291    const GLint ypos = ctx->DrawBuffer->_Ymin;
 292    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 293    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 294
 295    if(!acc_strb->data)
 296       return;
 297
 298    /* make sure color bufs aren't cached */
 299    st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
 300
 301    switch (op) {
 302    case GL_ADD:
 303       if (value != 0.0F) {
 304          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 305       }
 306       break;
 307    case GL_MULT:
 308       if (value != 1.0F) {
 309          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 310       }
 311       break;
 312    case GL_ACCUM:
 313       if (value != 0.0F) {
 314          accum_accum(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 315       }
 316       break;
 317    case GL_LOAD:
 318       accum_load(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 319       break;
 320    case GL_RETURN:
 321       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 322       break;
 323    default:
 324       assert(0);
 325    }
 326 }
 327
 328
 329
 330 void st_init_accum_functions(struct dd_function_table *functions)
 331 {
 332    functions->Accum = st_Accum;
 333 }