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    struct pipe_screen *screen = ctx->st->pipe->screen;
 110    const GLint xpos = ctx->DrawBuffer->_Xmin;
 111    const GLint ypos = ctx->DrawBuffer->_Ymin;
 112    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 113    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 114    GLvoid *map;
 115
 116    map = screen->surface_map(screen, acc_ps,
 117                              PIPE_BUFFER_USAGE_CPU_WRITE);
 118
 119    /* note acc_strb->format might not equal acc_ps->format */
 120    switch (acc_strb->format) {
 121    case PIPE_FORMAT_R16G16B16A16_SNORM:
 122       {
 123          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
 124          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
 125          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
 126          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
 127          int i, j;
 128          for (i = 0; i < height; i++) {
 129             GLshort *dst = ((GLshort *) map
 130                             + ((ypos + i) * acc_ps->pitch + xpos) * 4);
 131             for (j = 0; j < width; j++) {
 132                dst[0] = r;
 133                dst[1] = g;
 134                dst[2] = b;
 135                dst[3] = a;
 136                dst += 4;
 137             }
 138          }
 139       }
 140       break;
 141    default:
 142       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
 143    }
 144
 145    screen->surface_unmap(screen, acc_ps);
 146 }
 147
 148
 149 /** For ADD/MULT */
 150 static void
 151 accum_mad(GLcontext *ctx, GLfloat scale, GLfloat bias,
 152           GLint xpos, GLint ypos, GLint width, GLint height,
 153           struct st_renderbuffer *acc_strb)
 154 {
 155    struct pipe_screen *screen = ctx->st->pipe->screen;
 156    struct pipe_surface *acc_ps = acc_strb->surface;
 157    GLvoid *map;
 158
 159    map = screen->surface_map(screen, acc_ps,
 160                              PIPE_BUFFER_USAGE_CPU_WRITE);
 161
 162    /* note acc_strb->format might not equal acc_ps->format */
 163    switch (acc_strb->format) {
 164    case PIPE_FORMAT_R16G16B16A16_SNORM:
 165       {
 166          int i, j;
 167          for (i = 0; i < height; i++) {
 168             GLshort *acc = ((GLshort *) map
 169                             + ((ypos + i) * acc_ps->pitch + xpos) * 4);
 170             for (j = 0; j < width * 4; j++) {
 171                float val = SHORT_TO_FLOAT(acc[j]) * scale + bias;
 172                acc[j] = FLOAT_TO_SHORT(val);
 173             }
 174          }
 175       }
 176       break;
 177    default:
 178       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 179    }
 180
 181    screen->surface_unmap(screen, acc_ps);
 182 }
 183
 184
 185 static void
 186 accum_accum(struct pipe_context *pipe, GLfloat value,
 187             GLint xpos, GLint ypos, GLint width, GLint height,
 188             struct pipe_surface *acc_ps,
 189             struct pipe_surface *color_ps)
 190 {
 191    GLfloat *colorBuf, *accBuf;
 192    GLint i;
 193
 194    colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 195    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 196
 197    pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, colorBuf);
 198    acc_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 199
 200    for (i = 0; i < 4 * width * height; i++) {
 201       accBuf[i] = accBuf[i] + colorBuf[i] * value;
 202    }
 203
 204    acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 205
 206    free(colorBuf);
 207    free(accBuf);
 208 }
 209
 210
 211 static void
 212 accum_load(struct pipe_context *pipe, GLfloat value,
 213            GLint xpos, GLint ypos, GLint width, GLint height,
 214            struct pipe_surface *acc_ps,
 215            struct pipe_surface *color_ps)
 216 {
 217    GLfloat *buf;
 218    GLint i;
 219
 220    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 221
 222    pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, buf);
 223
 224    for (i = 0; i < 4 * width * height; i++) {
 225       buf[i] = buf[i] * value;
 226    }
 227
 228    acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, buf);
 229
 230    free(buf);
 231 }
 232
 233
 234 static void
 235 accum_return(GLcontext *ctx, GLfloat value,
 236              GLint xpos, GLint ypos, GLint width, GLint height,
 237              struct pipe_surface *acc_ps,
 238              struct pipe_surface *color_ps)
 239 {
 240    struct pipe_context *pipe = ctx->st->pipe;
 241    const GLubyte *colormask = ctx->Color.ColorMask;
 242    GLfloat *abuf, *cbuf = NULL;
 243    GLint i, ch;
 244
 245    abuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 246
 247    acc_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, abuf);
 248
 249    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
 250       cbuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 251       pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, cbuf);
 252    }
 253
 254    for (i = 0; i < width * height; i++) {
 255       for (ch = 0; ch < 4; ch++) {
 256          if (colormask[ch]) {
 257             GLfloat val = abuf[i * 4 + ch] * value;
 258             abuf[i * 4 + ch] = CLAMP(val, 0.0, 1.0);
 259          }
 260          else {
 261             abuf[i * 4 + ch] = cbuf[i * 4 + ch];
 262          }
 263       }
 264    }
 265
 266    pipe_put_tile_rgba(pipe, color_ps, xpos, ypos, width, height, abuf);
 267
 268    free(abuf);
 269    if (cbuf)
 270       free(cbuf);
 271 }
 272
 273
 274 static void
 275 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 276 {
 277    struct st_context *st = ctx->st;
 278    struct pipe_context *pipe = st->pipe;
 279    struct st_renderbuffer *acc_strb
 280      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 281    struct st_renderbuffer *color_strb
 282       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 283    struct pipe_surface *acc_ps = acc_strb->surface;
 284    struct pipe_surface *color_ps = color_strb->surface;
 285
 286    const GLint xpos = ctx->DrawBuffer->_Xmin;
 287    const GLint ypos = ctx->DrawBuffer->_Ymin;
 288    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 289    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 290
 291    /* make sure color bufs aren't cached */
 292    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 293
 294    switch (op) {
 295    case GL_ADD:
 296       if (value != 0.0F) {
 297          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 298       }
 299       break;
 300    case GL_MULT:
 301       if (value != 1.0F) {
 302          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 303       }
 304       break;
 305    case GL_ACCUM:
 306       if (value != 0.0F) {
 307          accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 308       }
 309       break;
 310    case GL_LOAD:
 311       accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 312       break;
 313    case GL_RETURN:
 314       accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
 315       break;
 316    default:
 317       assert(0);
 318    }
 319 }
 320
 321
 322
 323 void st_init_accum_functions(struct dd_function_table *functions)
 324 {
 325    functions->Accum = st_Accum;
 326 }