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_draw.h"
  42 #include "st_public.h"
  43 #include "st_format.h"
  44 #include "st_texture.h"
  45 #include "st_inlines.h"
  46 #include "pipe/p_context.h"
  47 #include "pipe/p_defines.h"
  48 #include "pipe/p_inlines.h"
  49 #include "util/u_tile.h"
  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 void
  60 st_clear_accum_buffer(GLcontext *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(GLcontext *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_screen *screen = pipe->screen;
 135    struct pipe_transfer *color_trans;
 136    size_t stride = acc_strb->stride;
 137    GLubyte *data = acc_strb->data;
 138    GLfloat *buf;
 139
 140    if (ST_DEBUG & DEBUG_FALLBACK)
 141       debug_printf("%s: fallback processing\n", __FUNCTION__);
 142
 143    color_trans = st_cond_flush_get_tex_transfer(st, color_strb->texture,
 144                                                 0, 0, 0,
 145                                                 PIPE_TRANSFER_READ, xpos, ypos,
 146                                                 width, height);
 147
 148    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 149
 150    pipe_get_tile_rgba(color_trans, 0, 0, width, height, buf);
 151
 152    switch (acc_strb->format) {
 153    case PIPE_FORMAT_R16G16B16A16_SNORM:
 154       {
 155          const GLfloat *color = buf;
 156          int i, j;
 157          for (i = 0; i < height; i++) {
 158             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 159             for (j = 0; j < width * 4; j++) {
 160                float val = *color++ * value;
 161                *acc++ += FLOAT_TO_SHORT(val);
 162             }
 163          }
 164       }
 165       break;
 166    default:
 167       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 168    }
 169
 170    _mesa_free(buf);
 171    screen->tex_transfer_destroy(color_trans);
 172 }
 173
 174
 175 static void
 176 accum_load(struct st_context *st, GLfloat value,
 177            GLint xpos, GLint ypos, GLint width, GLint height,
 178            struct st_renderbuffer *acc_strb,
 179            struct st_renderbuffer *color_strb)
 180 {
 181    struct pipe_context *pipe = st->pipe;
 182    struct pipe_screen *screen = pipe->screen;
 183    struct pipe_transfer *color_trans;
 184    size_t stride = acc_strb->stride;
 185    GLubyte *data = acc_strb->data;
 186    GLfloat *buf;
 187
 188
 189    if (ST_DEBUG & DEBUG_FALLBACK)
 190       debug_printf("%s: fallback processing\n", __FUNCTION__);
 191
 192    color_trans = st_cond_flush_get_tex_transfer(st, color_strb->texture,
 193                                                 0, 0, 0,
 194                                                 PIPE_TRANSFER_READ, xpos, ypos,
 195                                                 width, height);
 196
 197    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 198
 199    pipe_get_tile_rgba(color_trans, 0, 0, width, height, buf);
 200
 201    switch (acc_strb->format) {
 202    case PIPE_FORMAT_R16G16B16A16_SNORM:
 203       {
 204          const GLfloat *color = buf;
 205          int i, j;
 206          for (i = 0; i < height; i++) {
 207             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 208             for (j = 0; j < width * 4; j++) {
 209                float val = *color++ * value;
 210                *acc++ = FLOAT_TO_SHORT(val);
 211             }
 212          }
 213       }
 214       break;
 215    default:
 216       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 217    }
 218
 219    _mesa_free(buf);
 220    screen->tex_transfer_destroy(color_trans);
 221 }
 222
 223
 224 static void
 225 accum_return(GLcontext *ctx, GLfloat value,
 226              GLint xpos, GLint ypos, GLint width, GLint height,
 227              struct st_renderbuffer *acc_strb,
 228              struct st_renderbuffer *color_strb)
 229 {
 230    struct pipe_context *pipe = ctx->st->pipe;
 231    struct pipe_screen *screen = pipe->screen;
 232    const GLubyte *colormask = ctx->Color.ColorMask;
 233    enum pipe_transfer_usage usage;
 234    struct pipe_transfer *color_trans;
 235    size_t stride = acc_strb->stride;
 236    const GLubyte *data = acc_strb->data;
 237    GLfloat *buf;
 238
 239    if (ST_DEBUG & DEBUG_FALLBACK)
 240       debug_printf("%s: fallback processing\n", __FUNCTION__);
 241
 242    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 243
 244    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3])
 245       usage = PIPE_TRANSFER_READ_WRITE;
 246    else
 247       usage = PIPE_TRANSFER_WRITE;
 248
 249    color_trans = st_cond_flush_get_tex_transfer(st_context(ctx),
 250                                                 color_strb->texture, 0, 0, 0,
 251                                                 usage,
 252                                                 xpos, ypos,
 253                                                 width, height);
 254
 255    if (usage & PIPE_TRANSFER_READ)
 256       pipe_get_tile_rgba(color_trans, 0, 0, width, height, buf);
 257
 258    switch (acc_strb->format) {
 259    case PIPE_FORMAT_R16G16B16A16_SNORM:
 260       {
 261          GLfloat *color = buf;
 262          int i, j, ch;
 263          for (i = 0; i < height; i++) {
 264             const GLshort *acc = (const GLshort *) (data + (ypos + i) * stride + xpos * 8);
 265             for (j = 0; j < width; j++) {
 266                for (ch = 0; ch < 4; ch++) {
 267                   if (colormask[ch]) {
 268                      GLfloat val = SHORT_TO_FLOAT(*acc * value);
 269                      *color = CLAMP(val, 0.0f, 1.0f);
 270                   }
 271                   else {
 272                      /* No change */
 273                   }
 274                   ++acc;
 275                   ++color;
 276                }
 277             }
 278          }
 279       }
 280       break;
 281    default:
 282       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 283    }
 284
 285    pipe_put_tile_rgba(color_trans, 0, 0, width, height, buf);
 286
 287    _mesa_free(buf);
 288    screen->tex_transfer_destroy(color_trans);
 289 }
 290
 291
 292 static void
 293 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 294 {
 295    struct st_context *st = ctx->st;
 296    struct st_renderbuffer *acc_strb
 297      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 298    struct st_renderbuffer *color_strb
 299       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 300
 301    const GLint xpos = ctx->DrawBuffer->_Xmin;
 302    const GLint ypos = ctx->DrawBuffer->_Ymin;
 303    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 304    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 305
 306    if(!acc_strb->data)
 307       return;
 308
 309    /* make sure color bufs aren't cached */
 310    st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
 311
 312    switch (op) {
 313    case GL_ADD:
 314       if (value != 0.0F) {
 315          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 316       }
 317       break;
 318    case GL_MULT:
 319       if (value != 1.0F) {
 320          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 321       }
 322       break;
 323    case GL_ACCUM:
 324       if (value != 0.0F) {
 325          accum_accum(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 326       }
 327       break;
 328    case GL_LOAD:
 329       accum_load(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 330       break;
 331    case GL_RETURN:
 332       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 333       break;
 334    default:
 335       assert(0);
 336    }
 337 }
 338
 339
 340
 341 void st_init_accum_functions(struct dd_function_table *functions)
 342 {
 343    functions->Accum = st_Accum;
 344 }