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_format.h"
  42 #include "pipe/p_context.h"
  43 #include "pipe/p_defines.h"
  44 #include "pipe/p_inlines.h"
  45 #include "util/p_tile.h"
  46
  47
  48 #define UNCLAMPED_FLOAT_TO_SHORT(us, f)  \
  49    us = ( (short) ( CLAMP((f), -1.0, 1.0) * 32767.0F) )
  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 /**
  60  * Wrapper for pipe_get_tile_rgba().  Do format/cpp override to make the
  61  * tile util function think the surface is 16bit/channel, even if it's not.
  62  * See also: st_renderbuffer_alloc_storage()
  63  */
  64 static void
  65 acc_get_tile_rgba(struct pipe_context *pipe, struct pipe_surface *acc_ps,
  66                   uint x, uint y, uint w, uint h, float *p)
  67 {
  68    const enum pipe_format f = acc_ps->format;
  69    const int cpp = acc_ps->cpp;
  70
  71    acc_ps->format = DEFAULT_ACCUM_PIPE_FORMAT;
  72    acc_ps->cpp = 8;
  73
  74    pipe_get_tile_rgba(pipe, acc_ps, x, y, w, h, p);
  75
  76    acc_ps->format = f;
  77    acc_ps->cpp = cpp;
  78 }
  79
  80
  81 /**
  82  * Wrapper for pipe_put_tile_rgba().  Do format/cpp override to make the
  83  * tile util function think the surface is 16bit/channel, even if it's not.
  84  * See also: st_renderbuffer_alloc_storage()
  85  */
  86 static void
  87 acc_put_tile_rgba(struct pipe_context *pipe, struct pipe_surface *acc_ps,
  88                   uint x, uint y, uint w, uint h, const float *p)
  89 {
  90    enum pipe_format f = acc_ps->format;
  91    const int cpp = acc_ps->cpp;
  92
  93    acc_ps->format = DEFAULT_ACCUM_PIPE_FORMAT;
  94    acc_ps->cpp = 8;
  95
  96    pipe_put_tile_rgba(pipe, acc_ps, x, y, w, h, p);
  97
  98    acc_ps->format = f;
  99    acc_ps->cpp = cpp;
 100 }
 101
 102
 103
 104 void
 105 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
 106 {
 107    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
 108    struct pipe_surface *acc_ps = acc_strb->surface;
 109    const GLint xpos = ctx->DrawBuffer->_Xmin;
 110    const GLint ypos = ctx->DrawBuffer->_Ymin;
 111    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 112    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 113    GLvoid *map;
 114
 115    map = pipe_surface_map(acc_ps);
 116
 117    /* note acc_strb->format might not equal acc_ps->format */
 118    switch (acc_strb->format) {
 119    case PIPE_FORMAT_R16G16B16A16_SNORM:
 120       {
 121          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
 122          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
 123          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
 124          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
 125          int i, j;
 126          for (i = 0; i < height; i++) {
 127             GLshort *dst = ((GLshort *) map
 128                             + ((ypos + i) * acc_ps->pitch + xpos) * 4);
 129             for (j = 0; j < width; j++) {
 130                dst[0] = r;
 131                dst[1] = g;
 132                dst[2] = b;
 133                dst[3] = a;
 134                dst += 4;
 135             }
 136          }
 137       }
 138       break;
 139    default:
 140       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
 141    }
 142
 143    pipe_surface_unmap(acc_ps);
 144 }
 145
 146
 147 /** For ADD/MULT */
 148 static void
 149 accum_mad(GLcontext *ctx, GLfloat scale, GLfloat bias,
 150           GLint xpos, GLint ypos, GLint width, GLint height,
 151           struct st_renderbuffer *acc_strb)
 152 {
 153    struct pipe_surface *acc_ps = acc_strb->surface;
 154    GLvoid *map;
 155
 156    map = pipe_surface_map(acc_ps);
 157
 158    /* note acc_strb->format might not equal acc_ps->format */
 159    switch (acc_strb->format) {
 160    case PIPE_FORMAT_R16G16B16A16_SNORM:
 161       {
 162          int i, j;
 163          for (i = 0; i < height; i++) {
 164             GLshort *acc = ((GLshort *) map
 165                             + ((ypos + i) * acc_ps->pitch + xpos) * 4);
 166             for (j = 0; j < width * 4; j++) {
 167                float val = SHORT_TO_FLOAT(acc[j]) * scale + bias;
 168                acc[j] = FLOAT_TO_SHORT(val);
 169             }
 170          }
 171       }
 172       break;
 173    default:
 174       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 175    }
 176 }
 177
 178
 179 static void
 180 accum_accum(struct pipe_context *pipe, GLfloat value,
 181             GLint xpos, GLint ypos, GLint width, GLint height,
 182             struct pipe_surface *acc_ps,
 183             struct pipe_surface *color_ps)
 184 {
 185    GLfloat *colorBuf, *accBuf;
 186    GLint i;
 187
 188    colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 189    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 190
 191    pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, colorBuf);
 192    acc_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 193
 194    for (i = 0; i < 4 * width * height; i++) {
 195       accBuf[i] = accBuf[i] + colorBuf[i] * value;
 196    }
 197
 198    acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 199
 200    free(colorBuf);
 201    free(accBuf);
 202 }
 203
 204
 205 static void
 206 accum_load(struct pipe_context *pipe, GLfloat value,
 207            GLint xpos, GLint ypos, GLint width, GLint height,
 208            struct pipe_surface *acc_ps,
 209            struct pipe_surface *color_ps)
 210 {
 211    GLfloat *buf;
 212    GLint i;
 213
 214    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 215
 216    pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, buf);
 217
 218    for (i = 0; i < 4 * width * height; i++) {
 219       buf[i] = buf[i] * value;
 220    }
 221
 222    acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, buf);
 223
 224    free(buf);
 225 }
 226
 227
 228 static void
 229 accum_return(GLcontext *ctx, GLfloat value,
 230              GLint xpos, GLint ypos, GLint width, GLint height,
 231              struct pipe_surface *acc_ps,
 232              struct pipe_surface *color_ps)
 233 {
 234    struct pipe_context *pipe = ctx->st->pipe;
 235    const GLubyte *colormask = ctx->Color.ColorMask;
 236    GLfloat *abuf, *cbuf = NULL;
 237    GLint i, ch;
 238
 239    abuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 240
 241    acc_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, abuf);
 242
 243    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
 244       cbuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 245       pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, cbuf);
 246    }
 247
 248    for (i = 0; i < width * height; i++) {
 249       for (ch = 0; ch < 4; ch++) {
 250          if (colormask[ch]) {
 251             GLfloat val = abuf[i * 4 + ch] * value;
 252             abuf[i * 4 + ch] = CLAMP(val, 0.0, 1.0);
 253          }
 254          else {
 255             abuf[i * 4 + ch] = cbuf[i * 4 + ch];
 256          }
 257       }
 258    }
 259
 260    pipe_put_tile_rgba(pipe, color_ps, xpos, ypos, width, height, abuf);
 261
 262    free(abuf);
 263    if (cbuf)
 264       free(cbuf);
 265 }
 266
 267
 268 static void
 269 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 270 {
 271    struct st_context *st = ctx->st;
 272    struct pipe_context *pipe = st->pipe;
 273    struct st_renderbuffer *acc_strb
 274      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 275    struct st_renderbuffer *color_strb
 276       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 277    struct pipe_surface *acc_ps = acc_strb->surface;
 278    struct pipe_surface *color_ps = color_strb->surface;
 279
 280    const GLint xpos = ctx->DrawBuffer->_Xmin;
 281    const GLint ypos = ctx->DrawBuffer->_Ymin;
 282    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 283    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 284
 285    /* make sure color bufs aren't cached */
 286    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 287
 288    switch (op) {
 289    case GL_ADD:
 290       if (value != 0.0F) {
 291          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 292       }
 293       break;
 294    case GL_MULT:
 295       if (value != 1.0F) {
 296          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 297       }
 298       break;
 299    case GL_ACCUM:
 300       if (value != 0.0F) {
 301          accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 302       }
 303       break;
 304    case GL_LOAD:
 305       accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 306       break;
 307    case GL_RETURN:
 308       accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
 309       break;
 310    default:
 311       assert(0);
 312    }
 313 }
 314
 315
 316
 317 void st_init_accum_functions(struct dd_function_table *functions)
 318 {
 319    functions->Accum = st_Accum;
 320 }