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 /** For ADD/MULT */
  55 static void
  56 accum_mad(struct pipe_context *pipe, GLfloat scale, GLfloat bias,
  57           GLint xpos, GLint ypos, GLint width, GLint height,
  58           struct pipe_surface *acc_ps)
  59 {
  60    GLfloat *accBuf;
  61    GLint i;
  62
  63    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
  64
  65    (void) pipe->region_map(pipe, acc_ps->region);
  66
  67    acc_ps->get_tile(acc_ps, xpos, ypos, width, height, accBuf);
  68
  69    for (i = 0; i < 4 * width * height; i++) {
  70       GLfloat val = accBuf[i] * scale + bias;
  71       accBuf[i] = CLAMP(val, 0.0, 1.0);
  72    }
  73
  74    acc_ps->put_tile(acc_ps, xpos, ypos, width, height, accBuf);
  75
  76    _mesa_free(accBuf);
  77
  78    pipe->region_unmap(pipe, acc_ps->region);
  79 }
  80
  81
  82 static void
  83 accum_accum(struct pipe_context *pipe, GLfloat value,
  84             GLint xpos, GLint ypos, GLint width, GLint height,
  85             struct pipe_surface *acc_ps,
  86             struct pipe_surface *color_ps)
  87 {
  88    ubyte *colorMap, *accMap;
  89    GLfloat *colorBuf, *accBuf;
  90    GLint i;
  91
  92    colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
  93    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
  94
  95    colorMap = pipe->region_map(pipe, color_ps->region);
  96    accMap = pipe->region_map(pipe, acc_ps->region);
  97
  98    color_ps->get_tile(color_ps, xpos, ypos, width, height, colorBuf);
  99    acc_ps->get_tile(acc_ps, xpos, ypos, width, height, accBuf);
 100
 101    for (i = 0; i < 4 * width * height; i++) {
 102       GLfloat val = accBuf[i] + colorBuf[i] * value;
 103       accBuf[i] = CLAMP(val, 0.0, 1.0);
 104    }
 105
 106    acc_ps->put_tile(acc_ps, xpos, ypos, width, height, accBuf);
 107
 108    _mesa_free(colorBuf);
 109    _mesa_free(accBuf);
 110
 111    pipe->region_unmap(pipe, color_ps->region);
 112    pipe->region_unmap(pipe, acc_ps->region);
 113 }
 114
 115
 116 static void
 117 accum_load(struct pipe_context *pipe, GLfloat value,
 118            GLint xpos, GLint ypos, GLint width, GLint height,
 119            struct pipe_surface *acc_ps,
 120            struct pipe_surface *color_ps)
 121 {
 122    GLfloat *buf;
 123    GLint i;
 124
 125    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 126
 127    (void) pipe->region_map(pipe, color_ps->region);
 128    (void) pipe->region_map(pipe, acc_ps->region);
 129
 130    color_ps->get_tile(color_ps, xpos, ypos, width, height, buf);
 131
 132    for (i = 0; i < 4 * width * height; i++) {
 133       GLfloat val = buf[i] * value;
 134       buf[i] = CLAMP(val, 0.0, 1.0);
 135    }
 136
 137    acc_ps->put_tile(acc_ps, xpos, ypos, width, height, buf);
 138
 139    _mesa_free(buf);
 140
 141    pipe->region_unmap(pipe, color_ps->region);
 142    pipe->region_unmap(pipe, acc_ps->region);
 143 }
 144
 145
 146 static void
 147 accum_return(GLcontext *ctx, GLfloat value,
 148              GLint xpos, GLint ypos, GLint width, GLint height,
 149              struct pipe_surface *acc_ps,
 150              struct pipe_surface *color_ps)
 151 {
 152    struct pipe_context *pipe = ctx->st->pipe;
 153    const GLboolean writeR = ctx->Color.ColorMask[0];
 154    const GLboolean writeG = ctx->Color.ColorMask[1];
 155    const GLboolean writeB = ctx->Color.ColorMask[2];
 156    const GLboolean writeA = ctx->Color.ColorMask[3];
 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    acc_ps->get_tile(acc_ps, xpos, ypos, width, height, buf);
 166
 167    for (i = 0; i < width * height; i++) {
 168       if (writeR) {
 169          GLfloat r = buf[i * 4 + 0] * value;
 170          buf[i * 4 + 0] = CLAMP(r, 0.0, 1.0);
 171       }
 172       if (writeG) {
 173          GLfloat g = buf[i * 4 + 1] * value;
 174          buf[i * 4 + 1] = CLAMP(g, 0.0, 1.0);
 175       }
 176       if (writeB) {
 177          GLfloat b = buf[i * 4 + 2] * value;
 178          buf[i * 4 + 2] = CLAMP(b, 0.0, 1.0);
 179       }
 180       if (writeA) {
 181          GLfloat a = buf[i * 4 + 3] * value;
 182          buf[i * 4 + 3] = CLAMP(a, 0.0, 1.0);
 183       }
 184    }
 185
 186    color_ps->put_tile(color_ps, xpos, ypos, width, height, buf);
 187
 188    _mesa_free(buf);
 189
 190    pipe->region_unmap(pipe, color_ps->region);
 191    pipe->region_unmap(pipe, acc_ps->region);
 192 }
 193
 194
 195 static void
 196 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 197 {
 198    struct st_context *st = ctx->st;
 199    struct pipe_context *pipe = st->pipe;
 200    struct st_renderbuffer *acc_strb
 201      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 202    struct st_renderbuffer *color_strb
 203       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 204    struct pipe_surface *acc_ps = acc_strb->surface;
 205    struct pipe_surface *color_ps = color_strb->surface;
 206
 207    const GLint xpos = ctx->DrawBuffer->_Xmin;
 208    const GLint ypos = ctx->DrawBuffer->_Ymin;
 209    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 210    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 211
 212    switch (op) {
 213    case GL_ADD:
 214       if (value != 0.0F) {
 215          accum_mad(pipe, 1.0, value, xpos, ypos, width, height, acc_ps);
 216       }
 217       break;
 218    case GL_MULT:
 219       if (value != 1.0F) {
 220          accum_mad(pipe, value, 0.0, xpos, ypos, width, height, acc_ps);
 221       }
 222       break;
 223    case GL_ACCUM:
 224       if (value != 0.0F) {
 225          accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 226       }
 227       break;
 228    case GL_LOAD:
 229       accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 230       break;
 231    case GL_RETURN:
 232       accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
 233       break;
 234    default:
 235       assert(0);
 236    }
 237 }
 238
 239
 240
 241 void st_init_accum_functions(struct dd_function_table *functions)
 242 {
 243    functions->Accum = st_Accum;
 244 }