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 #include "pipe/util/p_tile.h"
  47
  48
  49 #define UNCLAMPED_FLOAT_TO_SHORT(us, f)  \
  50    us = ( (short) ( CLAMP((f), -1.0, 1.0) * 32767.0F) )
  51
  52
  53 /**
  54  * For hardware that supports deep color buffers, we could accelerate
  55  * most/all the accum operations with blending/texturing.
  56  * For now, just use the get/put_tile() functions and do things in software.
  57  */
  58
  59
  60 void
  61 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
  62 {
  63    struct pipe_context *pipe = ctx->st->pipe;
  64    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  65    struct pipe_surface *acc_ps = acc_strb->surface;
  66    const GLint xpos = ctx->DrawBuffer->_Xmin;
  67    const GLint ypos = ctx->DrawBuffer->_Ymin;
  68    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
  69    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
  70    const GLfloat r = ctx->Accum.ClearColor[0];
  71    const GLfloat g = ctx->Accum.ClearColor[1];
  72    const GLfloat b = ctx->Accum.ClearColor[2];
  73    const GLfloat a = ctx->Accum.ClearColor[3];
  74    GLfloat *accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
  75    int i;
  76
  77    for (i = 0; i < width * height; i++) {
  78       accBuf[i*4+0] = r;
  79       accBuf[i*4+1] = g;
  80       accBuf[i*4+2] = b;
  81       accBuf[i*4+3] = a;
  82    }
  83
  84    pipe_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
  85 }
  86
  87
  88 /** For ADD/MULT */
  89 static void
  90 accum_mad(struct pipe_context *pipe, GLfloat scale, GLfloat bias,
  91           GLint xpos, GLint ypos, GLint width, GLint height,
  92           struct pipe_surface *acc_ps)
  93 {
  94    GLfloat *accBuf;
  95    GLint i;
  96
  97    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
  98
  99    pipe_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 100
 101    for (i = 0; i < 4 * width * height; i++) {
 102       accBuf[i] = accBuf[i] * scale + bias;
 103    }
 104
 105    pipe_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 106
 107    free(accBuf);
 108 }
 109
 110
 111 static void
 112 accum_accum(struct pipe_context *pipe, GLfloat value,
 113             GLint xpos, GLint ypos, GLint width, GLint height,
 114             struct pipe_surface *acc_ps,
 115             struct pipe_surface *color_ps)
 116 {
 117    GLfloat *colorBuf, *accBuf;
 118    GLint i;
 119
 120    colorBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 121    accBuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 122
 123    pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, colorBuf);
 124    pipe_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 125
 126    for (i = 0; i < 4 * width * height; i++) {
 127       accBuf[i] = accBuf[i] + colorBuf[i] * value;
 128    }
 129
 130    pipe_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, accBuf);
 131
 132    free(colorBuf);
 133    free(accBuf);
 134 }
 135
 136
 137 static void
 138 accum_load(struct pipe_context *pipe, GLfloat value,
 139            GLint xpos, GLint ypos, GLint width, GLint height,
 140            struct pipe_surface *acc_ps,
 141            struct pipe_surface *color_ps)
 142 {
 143    GLfloat *buf;
 144    GLint i;
 145
 146    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 147
 148    pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, buf);
 149
 150    for (i = 0; i < 4 * width * height; i++) {
 151       buf[i] = buf[i] * value;
 152    }
 153
 154    pipe_put_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, buf);
 155
 156    free(buf);
 157 }
 158
 159
 160 static void
 161 accum_return(GLcontext *ctx, GLfloat value,
 162              GLint xpos, GLint ypos, GLint width, GLint height,
 163              struct pipe_surface *acc_ps,
 164              struct pipe_surface *color_ps)
 165 {
 166    struct pipe_context *pipe = ctx->st->pipe;
 167    const GLubyte *colormask = ctx->Color.ColorMask;
 168    GLfloat *abuf, *cbuf = NULL;
 169    GLint i, ch;
 170
 171    abuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 172
 173    pipe_get_tile_rgba(pipe, acc_ps, xpos, ypos, width, height, abuf);
 174
 175    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3]) {
 176       cbuf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 177       pipe_get_tile_rgba(pipe, color_ps, xpos, ypos, width, height, cbuf);
 178    }
 179
 180    for (i = 0; i < width * height; i++) {
 181       for (ch = 0; ch < 4; ch++) {
 182          if (colormask[ch]) {
 183             GLfloat val = abuf[i * 4 + ch] * value;
 184             abuf[i * 4 + ch] = CLAMP(val, 0.0, 1.0);
 185          }
 186          else {
 187             abuf[i * 4 + ch] = cbuf[i * 4 + ch];
 188          }
 189       }
 190    }
 191
 192    pipe_put_tile_rgba(pipe, color_ps, xpos, ypos, width, height, abuf);
 193
 194    free(abuf);
 195    if (cbuf)
 196       free(cbuf);
 197 }
 198
 199
 200 static void
 201 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 202 {
 203    struct st_context *st = ctx->st;
 204    struct pipe_context *pipe = st->pipe;
 205    struct st_renderbuffer *acc_strb
 206      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 207    struct st_renderbuffer *color_strb
 208       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 209    struct pipe_surface *acc_ps = acc_strb->surface;
 210    struct pipe_surface *color_ps = color_strb->surface;
 211
 212    const GLint xpos = ctx->DrawBuffer->_Xmin;
 213    const GLint ypos = ctx->DrawBuffer->_Ymin;
 214    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 215    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 216
 217    /* make sure color bufs aren't cached */
 218    pipe->flush(pipe, PIPE_FLUSH_RENDER_CACHE);
 219
 220    switch (op) {
 221    case GL_ADD:
 222       if (value != 0.0F) {
 223          accum_mad(pipe, 1.0, value, xpos, ypos, width, height, acc_ps);
 224       }
 225       break;
 226    case GL_MULT:
 227       if (value != 1.0F) {
 228          accum_mad(pipe, value, 0.0, xpos, ypos, width, height, acc_ps);
 229       }
 230       break;
 231    case GL_ACCUM:
 232       if (value != 0.0F) {
 233          accum_accum(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 234       }
 235       break;
 236    case GL_LOAD:
 237       accum_load(pipe, value, xpos, ypos, width, height, acc_ps, color_ps);
 238       break;
 239    case GL_RETURN:
 240       accum_return(ctx, value, xpos, ypos, width, height, acc_ps, color_ps);
 241       break;
 242    default:
 243       assert(0);
 244    }
 245 }
 246
 247
 248
 249 void st_init_accum_functions(struct dd_function_table *functions)
 250 {
 251    functions->Accum = st_Accum;
 252 }