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 #include "pipe/p_inlines.h"
  46
  47
  48 /**
  49  * For hardware that supports deep color buffers, we could accelerate
  50  * most/all the accum operations with blending/texturing.
  51  * For now, just use the get/put_tile() functions and do things in software.
  52  */
  53
  54
  55 void
  56 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
  57 {
  58    struct pipe_context *pipe = ctx->st->pipe;
  59    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  60    struct pipe_surface *acc_ps = acc_strb->surface;
  61    const GLint xpos = ctx->DrawBuffer->_Xmin;
  62    const GLint ypos = ctx->DrawBuffer->_Ymin;
  63    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
  64    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
  65    const GLfloat r = ctx->Accum.ClearColor[0];
  66    const GLfloat g = ctx->Accum.ClearColor[1];
  67    const GLfloat b = ctx->Accum.ClearColor[2];
  68    const GLfloat a = ctx->Accum.ClearColor[3];
  69    GLfloat *accBuf;
  70    GLint i;
  71
  72    (void) pipe_surface_map(acc_ps);
  73
  74    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
  75
  76    for (i = 0; i < width * height; i++) {
  77       accBuf[i * 4 + 0] = r;
  78       accBuf[i * 4 + 1] = g;
  79       accBuf[i * 4 + 2] = b;
  80       accBuf[i * 4 + 3] = a;
  81    }
  82
  83    pipe->put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
  84
  85    free(accBuf);
  86
  87    pipe_surface_unmap(acc_ps);
  88 }
  89
  90
  91
  92 /** For ADD/MULT */
  93 static void
  94 accum_mad(struct pipe_context *pipe, GLfloat scale, GLfloat bias,
  95           GLint xpos, GLint ypos, GLint width, GLint height,
  96           struct pipe_surface *acc_ps)
  97 {
  98    GLfloat *accBuf;
  99    GLint i;
 100
 101    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 102
 103    (void) pipe_surface_map(acc_ps);
 104
 105    pipe->get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 106
 107    for (i = 0; i < 4 * width * height; i++) {
 108       accBuf[i] = accBuf[i] * scale + bias;
 109    }
 110
 111    pipe->put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 112
 113    free(accBuf);
 114
 115    pipe_surface_unmap(acc_ps);
 116 }
 117
 118
 119 static void
 120 accum_accum(struct pipe_context *pipe, GLfloat value,
 121             GLint xpos, GLint ypos, GLint width, GLint height,
 122             struct pipe_surface *acc_ps,
 123             struct pipe_surface *color_ps)
 124 {
 125    ubyte *colorMap, *accMap;
 126    GLfloat *colorBuf, *accBuf;
 127    GLint i;
 128
 129    colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 130    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 131
 132    colorMap = pipe_surface_map(color_ps);
 133    accMap = pipe_surface_map(acc_ps);
 134
 135    pipe->get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, colorBuf);
 136    pipe->get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 137
 138    for (i = 0; i < 4 * width * height; i++) {
 139       accBuf[i] = accBuf[i] + colorBuf[i] * value;
 140    }
 141
 142    pipe->put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 143
 144    free(colorBuf);
 145    free(accBuf);
 146
 147    pipe_surface_unmap(color_ps);
 148    pipe_surface_unmap(acc_ps);
 149 }
 150
 151
 152 static void
 153 accum_load(struct pipe_context *pipe, GLfloat value,
 154            GLint xpos, GLint ypos, GLint width, GLint height,
 155            struct pipe_surface *acc_ps,
 156            struct pipe_surface *color_ps)
 157 {
 158    GLfloat *buf;
 159    GLint i;
 160
 161    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 162
 163    (void) pipe_surface_map(color_ps);
 164    (void) pipe_surface_map(acc_ps);
 165
 166    pipe->get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, buf);
 167
 168    for (i = 0; i < 4 * width * height; i++) {
 169       buf[i] = buf[i] * value;
 170    }
 171
 172    pipe->put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, buf);
 173
 174    free(buf);
 175
 176    pipe_surface_unmap(color_ps);
 177    pipe_surface_unmap(acc_ps);
 178 }
 179
 180
 181 static void
 182 accum_return(GLcontext *ctx, GLfloat value,
 183              GLint xpos, GLint ypos, GLint width, GLint height,
 184              struct pipe_surface *acc_ps,
 185              struct pipe_surface *color_ps)
 186 {
 187    struct pipe_context *pipe = ctx->st->pipe;
 188    const GLubyte *colormask = ctx->Color.ColorMask;
 189    GLfloat *abuf, *cbuf = NULL;
 190    GLint i, ch;
 191
 192    abuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 193
 194    (void) pipe_surface_map(color_ps);
 195    (void) pipe_surface_map(acc_ps);
 196
 197    pipe->get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, abuf);
 198
 199    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
 200       cbuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 201       pipe->get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, cbuf);
 202    }
 203
 204    for (i = 0; i < width * height; i++) {
 205       for (ch = 0; ch < 4; ch++) {
 206          if (colormask[ch]) {
 207             GLfloat val = abuf[i * 4 + ch] * value;
 208             abuf[i * 4 + ch] = CLAMP(val, 0.0, 1.0);
 209          }
 210          else {
 211             abuf[i * 4 + ch] = cbuf[i * 4 + ch];
 212          }
 213       }
 214    }
 215
 216    pipe->put_tile_rgba(pipe, color_ps, xpos, ypos, width, height, abuf);
 217
 218    free(abuf);
 219    if (cbuf)
 220       free(cbuf);
 221
 222    pipe_surface_unmap(color_ps);
 223    pipe_surface_unmap(acc_ps);
 224 }
 225
 226
 227 static void
 228 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 229 {
 230    struct st_context *st = ctx->st;
 231    struct pipe_context *pipe = st->pipe;
 232    struct st_renderbuffer *acc_strb
 233      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 234    struct st_renderbuffer *color_strb
 235       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 236    struct pipe_surface *acc_ps = acc_strb->surface;
 237    struct pipe_surface *color_ps = color_strb->surface;
 238
 239    const GLint xpos = ctx->DrawBuffer->_Xmin;
 240    const GLint ypos = ctx->DrawBuffer->_Ymin;
 241    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 242    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 243
 244    /* make sure color bufs aren't cached */
 245    pipe->flush(pipe, 0);
 246
 247    switch (op) {
 248    case GL_ADD:
 249       if (value != 0.0F) {
 250          accum_mad(pipe, 1.0, value, xpos, ypos, width, height, acc_ps);
 251       }
 252       break;
 253    case GL_MULT:
 254       if (value != 1.0F) {
 255          accum_mad(pipe, value, 0.0, xpos, ypos, width, height, acc_ps);
 256       }
 257       break;
 258    case GL_ACCUM:
 259       if (value != 0.0F) {
 260          accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 261       }
 262       break;
 263    case GL_LOAD:
 264       accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 265       break;
 266    case GL_RETURN:
 267       accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
 268       break;
 269    default:
 270       assert(0);
 271    }
 272 }
 273
 274
 275
 276 void st_init_accum_functions(struct dd_function_table *functions)
 277 {
 278    functions->Accum = st_Accum;
 279 }