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_cache.h"
  39 #include "st_cb_accum.h"
  40 #include "st_cb_fbo.h"
  41 #include "st_draw.h"
  42 #include "st_format.h"
  43 #include "pipe/p_context.h"
  44 #include "pipe/p_defines.h"
  45
  46
  47 /**
  48  * For hardware that supports deep color buffers, we could accelerate
  49  * most/all the accum operations with blending/texturing.
  50  * For now, just use the get/put_tile() functions and do things in software.
  51  */
  52
  53
  54 void
  55 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
  56 {
  57    struct pipe_context *pipe = ctx->st->pipe;
  58    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  59    struct pipe_surface *acc_ps = acc_strb->surface;
  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    const GLfloat r = ctx->Accum.ClearColor[0];
  65    const GLfloat g = ctx->Accum.ClearColor[1];
  66    const GLfloat b = ctx->Accum.ClearColor[2];
  67    const GLfloat a = ctx->Accum.ClearColor[3];
  68    GLfloat *accBuf;
  69    GLint i;
  70
  71    (void) pipe->region_map(pipe, acc_ps->region);
  72
  73    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
  74
  75    for (i = 0; i < width * height; i++) {
  76       accBuf[i * 4 + 0] = r;
  77       accBuf[i * 4 + 1] = g;
  78       accBuf[i * 4 + 2] = b;
  79       accBuf[i * 4 + 3] = a;
  80    }
  81
  82    pipe->put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
  83
  84    free(accBuf);
  85
  86    pipe->region_unmap(pipe, acc_ps->region);
  87 }
  88
  89
  90
  91 /** For ADD/MULT */
  92 static void
  93 accum_mad(struct pipe_context *pipe, GLfloat scale, GLfloat bias,
  94           GLint xpos, GLint ypos, GLint width, GLint height,
  95           struct pipe_surface *acc_ps)
  96 {
  97    GLfloat *accBuf;
  98    GLint i;
  99
 100    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 101
 102    (void) pipe->region_map(pipe, acc_ps->region);
 103
 104    pipe->get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 105
 106    for (i = 0; i < 4 * width * height; i++) {
 107       accBuf[i] = accBuf[i] * scale + bias;
 108    }
 109
 110    pipe->put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 111
 112    free(accBuf);
 113
 114    pipe->region_unmap(pipe, acc_ps->region);
 115 }
 116
 117
 118 static void
 119 accum_accum(struct pipe_context *pipe, GLfloat value,
 120             GLint xpos, GLint ypos, GLint width, GLint height,
 121             struct pipe_surface *acc_ps,
 122             struct pipe_surface *color_ps)
 123 {
 124    ubyte *colorMap, *accMap;
 125    GLfloat *colorBuf, *accBuf;
 126    GLint i;
 127
 128    colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 129    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 130
 131    colorMap = pipe->region_map(pipe, color_ps->region);
 132    accMap = pipe->region_map(pipe, acc_ps->region);
 133
 134    pipe->get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, colorBuf);
 135    pipe->get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 136
 137    for (i = 0; i < 4 * width * height; i++) {
 138       accBuf[i] = accBuf[i] + colorBuf[i] * value;
 139    }
 140
 141    pipe->put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 142
 143    free(colorBuf);
 144    free(accBuf);
 145
 146    pipe->region_unmap(pipe, color_ps->region);
 147    pipe->region_unmap(pipe, acc_ps->region);
 148 }
 149
 150
 151 static void
 152 accum_load(struct pipe_context *pipe, GLfloat value,
 153            GLint xpos, GLint ypos, GLint width, GLint height,
 154            struct pipe_surface *acc_ps,
 155            struct pipe_surface *color_ps)
 156 {
 157    GLfloat *buf;
 158    GLint i;
 159
 160    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 161
 162    (void) pipe->region_map(pipe, color_ps->region);
 163    (void) pipe->region_map(pipe, acc_ps->region);
 164
 165    pipe->get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, buf);
 166
 167    for (i = 0; i < 4 * width * height; i++) {
 168       buf[i] = buf[i] * value;
 169    }
 170
 171    pipe->put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, buf);
 172
 173    free(buf);
 174
 175    pipe->region_unmap(pipe, color_ps->region);
 176    pipe->region_unmap(pipe, acc_ps->region);
 177 }
 178
 179
 180 static void
 181 accum_return(GLcontext *ctx, GLfloat value,
 182              GLint xpos, GLint ypos, GLint width, GLint height,
 183              struct pipe_surface *acc_ps,
 184              struct pipe_surface *color_ps)
 185 {
 186    struct pipe_context *pipe = ctx->st->pipe;
 187    const GLubyte *colormask = ctx->Color.ColorMask;
 188    GLfloat *abuf, *cbuf = NULL;
 189    GLint i, ch;
 190
 191    abuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 192
 193    (void) pipe->region_map(pipe, color_ps->region);
 194    (void) pipe->region_map(pipe, acc_ps->region);
 195
 196    pipe->get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, abuf);
 197
 198    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
 199       cbuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 200       pipe->get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, cbuf);
 201    }
 202
 203    for (i = 0; i < width * height; i++) {
 204       for (ch = 0; ch < 4; ch++) {
 205          if (colormask[ch]) {
 206             GLfloat val = abuf[i * 4 + ch] * value;
 207             abuf[i * 4 + ch] = CLAMP(val, 0.0, 1.0);
 208          }
 209          else {
 210             abuf[i * 4 + ch] = cbuf[i * 4 + ch];
 211          }
 212       }
 213    }
 214
 215    pipe->put_tile_rgba(pipe, color_ps, xpos, ypos, width, height, abuf);
 216
 217    free(abuf);
 218    if (cbuf)
 219       free(cbuf);
 220
 221    pipe->region_unmap(pipe, color_ps->region);
 222    pipe->region_unmap(pipe, acc_ps->region);
 223 }
 224
 225
 226 static void
 227 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 228 {
 229    struct st_context *st = ctx->st;
 230    struct pipe_context *pipe = st->pipe;
 231    struct st_renderbuffer *acc_strb
 232      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 233    struct st_renderbuffer *color_strb
 234       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 235    struct pipe_surface *acc_ps = acc_strb->surface;
 236    struct pipe_surface *color_ps = color_strb->surface;
 237
 238    const GLint xpos = ctx->DrawBuffer->_Xmin;
 239    const GLint ypos = ctx->DrawBuffer->_Ymin;
 240    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 241    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 242
 243    /* make sure color bufs aren't cached */
 244    pipe->flush(pipe, 0);
 245
 246    switch (op) {
 247    case GL_ADD:
 248       if (value != 0.0F) {
 249          accum_mad(pipe, 1.0, value, xpos, ypos, width, height, acc_ps);
 250       }
 251       break;
 252    case GL_MULT:
 253       if (value != 1.0F) {
 254          accum_mad(pipe, value, 0.0, xpos, ypos, width, height, acc_ps);
 255       }
 256       break;
 257    case GL_ACCUM:
 258       if (value != 0.0F) {
 259          accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 260       }
 261       break;
 262    case GL_LOAD:
 263       accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 264       break;
 265    case GL_RETURN:
 266       accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
 267       break;
 268    default:
 269       assert(0);
 270    }
 271 }
 272
 273
 274
 275 void st_init_accum_functions(struct dd_function_table *functions)
 276 {
 277    functions->Accum = st_Accum;
 278 }