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