src/mesa/state_tracker/acc2.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 static void
  60 acc_get_tile_rgba(struct pipe_context *pipe, struct pipe_surface *acc_ps,
  61                   uint x, uint y, uint w, uint h, float *p)
  62 {
  63    const enum pipe_format f = acc_ps->format;
  64    const int cpp = acc_ps->cpp;
  65
  66    acc_ps->format = PIPE_FORMAT_R16G16B16A16_SNORM;
  67    acc_ps->cpp = 8;
  68
  69    pipe_get_tile_rgba(pipe, acc_ps, x, y, w, h, p);
  70
  71    acc_ps->format = f;
  72    acc_ps->cpp = cpp;
  73 }
  74
  75
  76 static void
  77 acc_put_tile_rgba(struct pipe_context *pipe, struct pipe_surface *acc_ps,
  78                   uint x, uint y, uint w, uint h, const float *p)
  79 {
  80    enum pipe_format f = acc_ps->format;
  81    const int cpp = acc_ps->cpp;
  82
  83    acc_ps->format = PIPE_FORMAT_R16G16B16A16_SNORM;
  84    acc_ps->cpp = 8;
  85
  86    pipe_put_tile_rgba(pipe, acc_ps, x, y, w, h, p);
  87
  88    acc_ps->format = f;
  89    acc_ps->cpp = cpp;
  90 }
  91
  92
  93
  94 void
  95 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
  96 {
  97    struct pipe_context *pipe = ctx->st->pipe;
  98    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  99    struct pipe_surface *acc_ps = acc_strb->surface;
 100    const GLint xpos = ctx->DrawBuffer->_Xmin;
 101    const GLint ypos = ctx->DrawBuffer->_Ymin;
 102    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 103    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 104    const GLfloat r = ctx->Accum.ClearColor[0];
 105    const GLfloat g = ctx->Accum.ClearColor[1];
 106    const GLfloat b = ctx->Accum.ClearColor[2];
 107    const GLfloat a = ctx->Accum.ClearColor[3];
 108    GLfloat *accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 109    int i;
 110
 111 #if 1
 112    GLvoid *map;
 113
 114    map = pipe_surface_map(acc_ps);
 115    switch (acc_strb->format) {
 116    case PIPE_FORMAT_R16G16B16A16_SNORM:
 117       {
 118          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
 119          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
 120          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
 121          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
 122          int i, j;
 123          for (i = 0; i < height; i++) {
 124             GLshort *dst = ((GLshort *) map
 125                             + ((ypos + i) * acc_ps->pitch + xpos) * 4);
 126             for (j = 0; j < width; j++) {
 127                dst[0] = r;
 128                dst[1] = g;
 129                dst[2] = b;
 130                dst[3] = a;
 131                dst += 4;
 132             }
 133          }
 134       }
 135       break;
 136    default:
 137       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
 138    }
 139
 140    pipe_surface_unmap(acc_ps);
 141
 142 #else
 143    for (i = 0; i < width * height; i++) {
 144       accBuf[i*4+0] = r;
 145       accBuf[i*4+1] = g;
 146       accBuf[i*4+2] = b;
 147       accBuf[i*4+3] = a;
 148    }
 149
 150    acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 151 #endif
 152 }
 153
 154
 155 /** For ADD/MULT */
 156 static void
 157 accum_mad(struct pipe_context *pipe, GLfloat scale, GLfloat bias,
 158           GLint xpos, GLint ypos, GLint width, GLint height,
 159           struct pipe_surface *acc_ps)
 160 {
 161    GLfloat *accBuf;
 162    GLint i;
 163
 164    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 165
 166    pipe_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 167
 168    for (i = 0; i < 4 * width * height; i++) {
 169       accBuf[i] = accBuf[i] * scale + bias;
 170    }
 171
 172    pipe_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 173
 174    free(accBuf);
 175 }
 176
 177
 178 static void
 179 accum_accum(struct pipe_context *pipe, GLfloat value,
 180             GLint xpos, GLint ypos, GLint width, GLint height,
 181             struct pipe_surface *acc_ps,
 182             struct pipe_surface *color_ps)
 183 {
 184    GLfloat *colorBuf, *accBuf;
 185    GLint i;
 186
 187    colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 188    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 189
 190    pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, colorBuf);
 191    acc_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 192
 193    for (i = 0; i < 4 * width * height; i++) {
 194       accBuf[i] = accBuf[i] + colorBuf[i] * value;
 195    }
 196
 197    acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 198
 199    free(colorBuf);
 200    free(accBuf);
 201 }
 202
 203
 204 static void
 205 accum_load(struct pipe_context *pipe, GLfloat value,
 206            GLint xpos, GLint ypos, GLint width, GLint height,
 207            struct pipe_surface *acc_ps,
 208            struct pipe_surface *color_ps)
 209 {
 210    GLfloat *buf;
 211    GLint i;
 212
 213    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 214
 215    pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, buf);
 216
 217    for (i = 0; i < 4 * width * height; i++) {
 218       buf[i] = buf[i] * value;
 219    }
 220
 221    acc_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, buf);
 222
 223    free(buf);
 224 }
 225
 226
 227 static void
 228 accum_return(GLcontext *ctx, GLfloat value,
 229              GLint xpos, GLint ypos, GLint width, GLint height,
 230              struct pipe_surface *acc_ps,
 231              struct pipe_surface *color_ps)
 232 {
 233    struct pipe_context *pipe = ctx->st->pipe;
 234    const GLubyte *colormask = ctx->Color.ColorMask;
 235    GLfloat *abuf, *cbuf = NULL;
 236    GLint i, ch;
 237
 238    abuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 239
 240    acc_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, abuf);
 241
 242    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
 243       cbuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 244       pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, cbuf);
 245    }
 246
 247    for (i = 0; i < width * height; i++) {
 248       for (ch = 0; ch < 4; ch++) {
 249          if (colormask[ch]) {
 250             GLfloat val = abuf[i * 4 + ch] * value;
 251             abuf[i * 4 + ch] = CLAMP(val, 0.0, 1.0);
 252          }
 253          else {
 254             abuf[i * 4 + ch] = cbuf[i * 4 + ch];
 255          }
 256       }
 257    }
 258
 259    pipe_put_tile_rgba(pipe, color_ps, xpos, ypos, width, height, abuf);
 260
 261    free(abuf);
 262    if (cbuf)
 263       free(cbuf);
 264 }
 265
 266
 267 static void
 268 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 269 {
 270    struct st_context *st = ctx->st;
 271    struct pipe_context *pipe = st->pipe;
 272    struct st_renderbuffer *acc_strb
 273      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 274    struct st_renderbuffer *color_strb
 275       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 276    struct pipe_surface *acc_ps = acc_strb->surface;
 277    struct pipe_surface *color_ps = color_strb->surface;
 278
 279    const GLint xpos = ctx->DrawBuffer->_Xmin;
 280    const GLint ypos = ctx->DrawBuffer->_Ymin;
 281    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 282    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 283
 284    /* make sure color bufs aren't cached */
 285    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE, NULL);
 286
 287    switch (op) {
 288    case GL_ADD:
 289       if (value != 0.0F) {
 290          accum_mad(pipe, 1.0, value, xpos, ypos, width, height, acc_ps);
 291       }
 292       break;
 293    case GL_MULT:
 294       if (value != 1.0F) {
 295          accum_mad(pipe, value, 0.0, xpos, ypos, width, height, acc_ps);
 296       }
 297       break;
 298    case GL_ACCUM:
 299       if (value != 0.0F) {
 300          accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 301       }
 302       break;
 303    case GL_LOAD:
 304       accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 305       break;
 306    case GL_RETURN:
 307       accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
 308       break;
 309    default:
 310       assert(0);
 311    }
 312 }
 313
 314
 315
 316 void st_init_accum_functions(struct dd_function_table *functions)
 317 {
 318    functions->Accum = st_Accum;
 319 }