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 "st_inlines.h"
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_defines.h"
  45 #include "util/u_inlines.h"
  46 #include "util/u_tile.h"
  47
  48
  49 /**
  50  * For hardware that supports deep color buffers, we could accelerate
  51  * most/all the accum operations with blending/texturing.
  52  * For now, just use the get/put_tile() functions and do things in software.
  53  */
  54
  55
  56 void
  57 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
  58 {
  59    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  60    const GLint xpos = ctx->DrawBuffer->_Xmin;
  61    const GLint ypos = ctx->DrawBuffer->_Ymin;
  62    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
  63    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
  64    size_t stride = acc_strb->stride;
  65    GLubyte *data = acc_strb->data;
  66
  67    if(!data)
  68       return;
  69
  70    switch (acc_strb->format) {
  71    case PIPE_FORMAT_R16G16B16A16_SNORM:
  72       {
  73          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
  74          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
  75          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
  76          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
  77          int i, j;
  78          for (i = 0; i < height; i++) {
  79             GLshort *dst = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
  80             for (j = 0; j < width; j++) {
  81                dst[0] = r;
  82                dst[1] = g;
  83                dst[2] = b;
  84                dst[3] = a;
  85                dst += 4;
  86             }
  87          }
  88       }
  89       break;
  90    default:
  91       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
  92    }
  93 }
  94
  95
  96 /** For ADD/MULT */
  97 static void
  98 accum_mad(GLcontext *ctx, GLfloat scale, GLfloat bias,
  99           GLint xpos, GLint ypos, GLint width, GLint height,
 100           struct st_renderbuffer *acc_strb)
 101 {
 102    size_t stride = acc_strb->stride;
 103    GLubyte *data = acc_strb->data;
 104
 105    switch (acc_strb->format) {
 106    case PIPE_FORMAT_R16G16B16A16_SNORM:
 107       {
 108          int i, j;
 109          for (i = 0; i < height; i++) {
 110             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 111             for (j = 0; j < width * 4; j++) {
 112                float val = SHORT_TO_FLOAT(*acc) * scale + bias;
 113                *acc++ = FLOAT_TO_SHORT(val);
 114             }
 115          }
 116       }
 117       break;
 118    default:
 119       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 120    }
 121 }
 122
 123
 124 static void
 125 accum_accum(struct st_context *st, GLfloat value,
 126             GLint xpos, GLint ypos, GLint width, GLint height,
 127             struct st_renderbuffer *acc_strb,
 128             struct st_renderbuffer *color_strb)
 129 {
 130    struct pipe_context *pipe = st->pipe;
 131    struct pipe_transfer *color_trans;
 132    size_t stride = acc_strb->stride;
 133    GLubyte *data = acc_strb->data;
 134    GLfloat *buf;
 135
 136    if (ST_DEBUG & DEBUG_FALLBACK)
 137       debug_printf("%s: fallback processing\n", __FUNCTION__);
 138
 139    color_trans = st_cond_flush_get_tex_transfer(st,
 140                                                 color_strb->texture,
 141                                                 0, 0, 0,
 142                                                 PIPE_TRANSFER_READ, xpos, ypos,
 143                                                 width, height);
 144
 145    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 146
 147    pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 148
 149    switch (acc_strb->format) {
 150    case PIPE_FORMAT_R16G16B16A16_SNORM:
 151       {
 152          const GLfloat *color = buf;
 153          int i, j;
 154          for (i = 0; i < height; i++) {
 155             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 156             for (j = 0; j < width * 4; j++) {
 157                float val = *color++ * value;
 158                *acc++ += FLOAT_TO_SHORT(val);
 159             }
 160          }
 161       }
 162       break;
 163    default:
 164       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 165    }
 166
 167    free(buf);
 168    pipe->transfer_destroy(pipe, color_trans);
 169 }
 170
 171
 172 static void
 173 accum_load(struct st_context *st, GLfloat value,
 174            GLint xpos, GLint ypos, GLint width, GLint height,
 175            struct st_renderbuffer *acc_strb,
 176            struct st_renderbuffer *color_strb)
 177 {
 178    struct pipe_context *pipe = st->pipe;
 179    struct pipe_transfer *color_trans;
 180    size_t stride = acc_strb->stride;
 181    GLubyte *data = acc_strb->data;
 182    GLfloat *buf;
 183
 184
 185    if (ST_DEBUG & DEBUG_FALLBACK)
 186       debug_printf("%s: fallback processing\n", __FUNCTION__);
 187
 188    color_trans = st_cond_flush_get_tex_transfer(st, color_strb->texture,
 189                                                 0, 0, 0,
 190                                                 PIPE_TRANSFER_READ, xpos, ypos,
 191                                                 width, height);
 192
 193    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 194
 195    pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 196
 197    switch (acc_strb->format) {
 198    case PIPE_FORMAT_R16G16B16A16_SNORM:
 199       {
 200          const GLfloat *color = buf;
 201          int i, j;
 202          for (i = 0; i < height; i++) {
 203             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 204             for (j = 0; j < width * 4; j++) {
 205                float val = *color++ * value;
 206                *acc++ = FLOAT_TO_SHORT(val);
 207             }
 208          }
 209       }
 210       break;
 211    default:
 212       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 213    }
 214
 215    free(buf);
 216    pipe->transfer_destroy(pipe, color_trans);
 217 }
 218
 219
 220 static void
 221 accum_return(GLcontext *ctx, GLfloat value,
 222              GLint xpos, GLint ypos, GLint width, GLint height,
 223              struct st_renderbuffer *acc_strb,
 224              struct st_renderbuffer *color_strb)
 225 {
 226    struct pipe_context *pipe = st_context(ctx)->pipe;
 227    const GLubyte *colormask = ctx->Color.ColorMask[0];
 228    enum pipe_transfer_usage usage;
 229    struct pipe_transfer *color_trans;
 230    size_t stride = acc_strb->stride;
 231    const GLubyte *data = acc_strb->data;
 232    GLfloat *buf;
 233
 234    if (ST_DEBUG & DEBUG_FALLBACK)
 235       debug_printf("%s: fallback processing\n", __FUNCTION__);
 236
 237    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 238
 239    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3])
 240       usage = PIPE_TRANSFER_READ_WRITE;
 241    else
 242       usage = PIPE_TRANSFER_WRITE;
 243
 244    color_trans = st_cond_flush_get_tex_transfer(st_context(ctx),
 245                                                 color_strb->texture, 0, 0, 0,
 246                                                 usage,
 247                                                 xpos, ypos,
 248                                                 width, height);
 249
 250    if (usage & PIPE_TRANSFER_READ)
 251       pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 252
 253    switch (acc_strb->format) {
 254    case PIPE_FORMAT_R16G16B16A16_SNORM:
 255       {
 256          GLfloat *color = buf;
 257          int i, j, ch;
 258          for (i = 0; i < height; i++) {
 259             const GLshort *acc = (const GLshort *) (data + (ypos + i) * stride + xpos * 8);
 260             for (j = 0; j < width; j++) {
 261                for (ch = 0; ch < 4; ch++) {
 262                   if (colormask[ch]) {
 263                      GLfloat val = SHORT_TO_FLOAT(*acc * value);
 264                      *color = CLAMP(val, 0.0f, 1.0f);
 265                   }
 266                   else {
 267                      /* No change */
 268                   }
 269                   ++acc;
 270                   ++color;
 271                }
 272             }
 273          }
 274       }
 275       break;
 276    default:
 277       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 278    }
 279
 280    pipe_put_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 281
 282    free(buf);
 283    pipe->transfer_destroy(pipe, color_trans);
 284 }
 285
 286
 287 static void
 288 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 289 {
 290    struct st_context *st = st_context(ctx);
 291    struct st_renderbuffer *acc_strb
 292      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 293    struct st_renderbuffer *color_strb
 294       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 295
 296    const GLint xpos = ctx->DrawBuffer->_Xmin;
 297    const GLint ypos = ctx->DrawBuffer->_Ymin;
 298    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 299    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 300
 301    if(!acc_strb->data)
 302       return;
 303
 304    /* make sure color bufs aren't cached */
 305    st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
 306
 307    switch (op) {
 308    case GL_ADD:
 309       if (value != 0.0F) {
 310          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 311       }
 312       break;
 313    case GL_MULT:
 314       if (value != 1.0F) {
 315          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 316       }
 317       break;
 318    case GL_ACCUM:
 319       if (value != 0.0F) {
 320          accum_accum(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 321       }
 322       break;
 323    case GL_LOAD:
 324       accum_load(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 325       break;
 326    case GL_RETURN:
 327       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 328       break;
 329    default:
 330       assert(0);
 331    }
 332 }
 333
 334
 335
 336 void st_init_accum_functions(struct dd_function_table *functions)
 337 {
 338    functions->Accum = st_Accum;
 339 }