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_debug.h"
  38 #include "st_context.h"
  39 #include "st_cb_accum.h"
  40 #include "st_cb_fbo.h"
  41 #include "st_public.h"
  42 #include "st_texture.h"
  43 #include "st_inlines.h"
  44 #include "pipe/p_context.h"
  45 #include "pipe/p_defines.h"
  46 #include "util/u_inlines.h"
  47 #include "util/u_tile.h"
  48
  49
  50 /**
  51  * For hardware that supports deep color buffers, we could accelerate
  52  * most/all the accum operations with blending/texturing.
  53  * For now, just use the get/put_tile() functions and do things in software.
  54  */
  55
  56
  57 void
  58 st_clear_accum_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
  59 {
  60    struct st_renderbuffer *acc_strb = st_renderbuffer(rb);
  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    size_t stride = acc_strb->stride;
  66    GLubyte *data = acc_strb->data;
  67
  68    if(!data)
  69       return;
  70
  71    switch (acc_strb->format) {
  72    case PIPE_FORMAT_R16G16B16A16_SNORM:
  73       {
  74          GLshort r = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
  75          GLshort g = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
  76          GLshort b = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
  77          GLshort a = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
  78          int i, j;
  79          for (i = 0; i < height; i++) {
  80             GLshort *dst = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
  81             for (j = 0; j < width; j++) {
  82                dst[0] = r;
  83                dst[1] = g;
  84                dst[2] = b;
  85                dst[3] = a;
  86                dst += 4;
  87             }
  88          }
  89       }
  90       break;
  91    default:
  92       _mesa_problem(ctx, "unexpected format in st_clear_accum_buffer()");
  93    }
  94 }
  95
  96
  97 /** For ADD/MULT */
  98 static void
  99 accum_mad(GLcontext *ctx, GLfloat scale, GLfloat bias,
 100           GLint xpos, GLint ypos, GLint width, GLint height,
 101           struct st_renderbuffer *acc_strb)
 102 {
 103    size_t stride = acc_strb->stride;
 104    GLubyte *data = acc_strb->data;
 105
 106    switch (acc_strb->format) {
 107    case PIPE_FORMAT_R16G16B16A16_SNORM:
 108       {
 109          int i, j;
 110          for (i = 0; i < height; i++) {
 111             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 112             for (j = 0; j < width * 4; j++) {
 113                float val = SHORT_TO_FLOAT(*acc) * scale + bias;
 114                *acc++ = FLOAT_TO_SHORT(val);
 115             }
 116          }
 117       }
 118       break;
 119    default:
 120       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 121    }
 122 }
 123
 124
 125 static void
 126 accum_accum(struct st_context *st, GLfloat value,
 127             GLint xpos, GLint ypos, GLint width, GLint height,
 128             struct st_renderbuffer *acc_strb,
 129             struct st_renderbuffer *color_strb)
 130 {
 131    struct pipe_context *pipe = st->pipe;
 132    struct pipe_transfer *color_trans;
 133    size_t stride = acc_strb->stride;
 134    GLubyte *data = acc_strb->data;
 135    GLfloat *buf;
 136
 137    if (ST_DEBUG & DEBUG_FALLBACK)
 138       debug_printf("%s: fallback processing\n", __FUNCTION__);
 139
 140    color_trans = st_cond_flush_get_tex_transfer(st,
 141                                                 color_strb->texture,
 142                                                 0, 0, 0,
 143                                                 PIPE_TRANSFER_READ, xpos, ypos,
 144                                                 width, height);
 145
 146    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 147
 148    pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 149
 150    switch (acc_strb->format) {
 151    case PIPE_FORMAT_R16G16B16A16_SNORM:
 152       {
 153          const GLfloat *color = buf;
 154          int i, j;
 155          for (i = 0; i < height; i++) {
 156             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 157             for (j = 0; j < width * 4; j++) {
 158                float val = *color++ * value;
 159                *acc++ += FLOAT_TO_SHORT(val);
 160             }
 161          }
 162       }
 163       break;
 164    default:
 165       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 166    }
 167
 168    free(buf);
 169    pipe->transfer_destroy(pipe, color_trans);
 170 }
 171
 172
 173 static void
 174 accum_load(struct st_context *st, GLfloat value,
 175            GLint xpos, GLint ypos, GLint width, GLint height,
 176            struct st_renderbuffer *acc_strb,
 177            struct st_renderbuffer *color_strb)
 178 {
 179    struct pipe_context *pipe = st->pipe;
 180    struct pipe_transfer *color_trans;
 181    size_t stride = acc_strb->stride;
 182    GLubyte *data = acc_strb->data;
 183    GLfloat *buf;
 184
 185
 186    if (ST_DEBUG & DEBUG_FALLBACK)
 187       debug_printf("%s: fallback processing\n", __FUNCTION__);
 188
 189    color_trans = st_cond_flush_get_tex_transfer(st, color_strb->texture,
 190                                                 0, 0, 0,
 191                                                 PIPE_TRANSFER_READ, xpos, ypos,
 192                                                 width, height);
 193
 194    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 195
 196    pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 197
 198    switch (acc_strb->format) {
 199    case PIPE_FORMAT_R16G16B16A16_SNORM:
 200       {
 201          const GLfloat *color = buf;
 202          int i, j;
 203          for (i = 0; i < height; i++) {
 204             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 205             for (j = 0; j < width * 4; j++) {
 206                float val = *color++ * value;
 207                *acc++ = FLOAT_TO_SHORT(val);
 208             }
 209          }
 210       }
 211       break;
 212    default:
 213       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 214    }
 215
 216    free(buf);
 217    pipe->transfer_destroy(pipe, color_trans);
 218 }
 219
 220
 221 static void
 222 accum_return(GLcontext *ctx, GLfloat value,
 223              GLint xpos, GLint ypos, GLint width, GLint height,
 224              struct st_renderbuffer *acc_strb,
 225              struct st_renderbuffer *color_strb)
 226 {
 227    struct pipe_context *pipe = ctx->st->pipe;
 228    const GLubyte *colormask = ctx->Color.ColorMask[0];
 229    enum pipe_transfer_usage usage;
 230    struct pipe_transfer *color_trans;
 231    size_t stride = acc_strb->stride;
 232    const GLubyte *data = acc_strb->data;
 233    GLfloat *buf;
 234
 235    if (ST_DEBUG & DEBUG_FALLBACK)
 236       debug_printf("%s: fallback processing\n", __FUNCTION__);
 237
 238    buf = (GLfloat *) malloc(width * height * 4 * sizeof(GLfloat));
 239
 240    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3])
 241       usage = PIPE_TRANSFER_READ_WRITE;
 242    else
 243       usage = PIPE_TRANSFER_WRITE;
 244
 245    color_trans = st_cond_flush_get_tex_transfer(st_context(ctx),
 246                                                 color_strb->texture, 0, 0, 0,
 247                                                 usage,
 248                                                 xpos, ypos,
 249                                                 width, height);
 250
 251    if (usage & PIPE_TRANSFER_READ)
 252       pipe_get_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 253
 254    switch (acc_strb->format) {
 255    case PIPE_FORMAT_R16G16B16A16_SNORM:
 256       {
 257          GLfloat *color = buf;
 258          int i, j, ch;
 259          for (i = 0; i < height; i++) {
 260             const GLshort *acc = (const GLshort *) (data + (ypos + i) * stride + xpos * 8);
 261             for (j = 0; j < width; j++) {
 262                for (ch = 0; ch < 4; ch++) {
 263                   if (colormask[ch]) {
 264                      GLfloat val = SHORT_TO_FLOAT(*acc * value);
 265                      *color = CLAMP(val, 0.0f, 1.0f);
 266                   }
 267                   else {
 268                      /* No change */
 269                   }
 270                   ++acc;
 271                   ++color;
 272                }
 273             }
 274          }
 275       }
 276       break;
 277    default:
 278       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 279    }
 280
 281    pipe_put_tile_rgba(pipe, color_trans, 0, 0, width, height, buf);
 282
 283    free(buf);
 284    pipe->transfer_destroy(pipe, color_trans);
 285 }
 286
 287
 288 static void
 289 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 290 {
 291    struct st_context *st = ctx->st;
 292    struct st_renderbuffer *acc_strb
 293      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 294    struct st_renderbuffer *color_strb
 295       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 296
 297    const GLint xpos = ctx->DrawBuffer->_Xmin;
 298    const GLint ypos = ctx->DrawBuffer->_Ymin;
 299    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 300    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 301
 302    if(!acc_strb->data)
 303       return;
 304
 305    /* make sure color bufs aren't cached */
 306    st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
 307
 308    switch (op) {
 309    case GL_ADD:
 310       if (value != 0.0F) {
 311          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 312       }
 313       break;
 314    case GL_MULT:
 315       if (value != 1.0F) {
 316          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 317       }
 318       break;
 319    case GL_ACCUM:
 320       if (value != 0.0F) {
 321          accum_accum(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 322       }
 323       break;
 324    case GL_LOAD:
 325       accum_load(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 326       break;
 327    case GL_RETURN:
 328       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 329       break;
 330    default:
 331       assert(0);
 332    }
 333 }
 334
 335
 336
 337 void st_init_accum_functions(struct dd_function_table *functions)
 338 {
 339    functions->Accum = st_Accum;
 340 }