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_screen *screen = pipe->screen;
 133    struct pipe_transfer *color_trans;
 134    size_t stride = acc_strb->stride;
 135    GLubyte *data = acc_strb->data;
 136    GLfloat *buf;
 137
 138    if (ST_DEBUG & DEBUG_FALLBACK)
 139       debug_printf("%s: fallback processing\n", __FUNCTION__);
 140
 141    color_trans = st_cond_flush_get_tex_transfer(st, color_strb->texture,
 142                                                 0, 0, 0,
 143                                                 PIPE_TRANSFER_READ, xpos, ypos,
 144                                                 width, height);
 145
 146    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 147
 148    pipe_get_tile_rgba(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    _mesa_free(buf);
 169    screen->tex_transfer_destroy(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_screen *screen = pipe->screen;
 181    struct pipe_transfer *color_trans;
 182    size_t stride = acc_strb->stride;
 183    GLubyte *data = acc_strb->data;
 184    GLfloat *buf;
 185
 186
 187    if (ST_DEBUG & DEBUG_FALLBACK)
 188       debug_printf("%s: fallback processing\n", __FUNCTION__);
 189
 190    color_trans = st_cond_flush_get_tex_transfer(st, color_strb->texture,
 191                                                 0, 0, 0,
 192                                                 PIPE_TRANSFER_READ, xpos, ypos,
 193                                                 width, height);
 194
 195    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 196
 197    pipe_get_tile_rgba(color_trans, 0, 0, width, height, buf);
 198
 199    switch (acc_strb->format) {
 200    case PIPE_FORMAT_R16G16B16A16_SNORM:
 201       {
 202          const GLfloat *color = buf;
 203          int i, j;
 204          for (i = 0; i < height; i++) {
 205             GLshort *acc = (GLshort *) (data + (ypos + i) * stride + xpos * 8);
 206             for (j = 0; j < width * 4; j++) {
 207                float val = *color++ * value;
 208                *acc++ = FLOAT_TO_SHORT(val);
 209             }
 210          }
 211       }
 212       break;
 213    default:
 214       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 215    }
 216
 217    _mesa_free(buf);
 218    screen->tex_transfer_destroy(color_trans);
 219 }
 220
 221
 222 static void
 223 accum_return(GLcontext *ctx, GLfloat value,
 224              GLint xpos, GLint ypos, GLint width, GLint height,
 225              struct st_renderbuffer *acc_strb,
 226              struct st_renderbuffer *color_strb)
 227 {
 228    struct pipe_context *pipe = ctx->st->pipe;
 229    struct pipe_screen *screen = pipe->screen;
 230    const GLubyte *colormask = ctx->Color.ColorMask[0];
 231    enum pipe_transfer_usage usage;
 232    struct pipe_transfer *color_trans;
 233    size_t stride = acc_strb->stride;
 234    const GLubyte *data = acc_strb->data;
 235    GLfloat *buf;
 236
 237    if (ST_DEBUG & DEBUG_FALLBACK)
 238       debug_printf("%s: fallback processing\n", __FUNCTION__);
 239
 240    buf = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
 241
 242    if (!colormask[0] || !colormask[1] || !colormask[2] || !colormask[3])
 243       usage = PIPE_TRANSFER_READ_WRITE;
 244    else
 245       usage = PIPE_TRANSFER_WRITE;
 246
 247    color_trans = st_cond_flush_get_tex_transfer(st_context(ctx),
 248                                                 color_strb->texture, 0, 0, 0,
 249                                                 usage,
 250                                                 xpos, ypos,
 251                                                 width, height);
 252
 253    if (usage & PIPE_TRANSFER_READ)
 254       pipe_get_tile_rgba(color_trans, 0, 0, width, height, buf);
 255
 256    switch (acc_strb->format) {
 257    case PIPE_FORMAT_R16G16B16A16_SNORM:
 258       {
 259          GLfloat *color = buf;
 260          int i, j, ch;
 261          for (i = 0; i < height; i++) {
 262             const GLshort *acc = (const GLshort *) (data + (ypos + i) * stride + xpos * 8);
 263             for (j = 0; j < width; j++) {
 264                for (ch = 0; ch < 4; ch++) {
 265                   if (colormask[ch]) {
 266                      GLfloat val = SHORT_TO_FLOAT(*acc * value);
 267                      *color = CLAMP(val, 0.0f, 1.0f);
 268                   }
 269                   else {
 270                      /* No change */
 271                   }
 272                   ++acc;
 273                   ++color;
 274                }
 275             }
 276          }
 277       }
 278       break;
 279    default:
 280       _mesa_problem(NULL, "unexpected format in st_clear_accum_buffer()");
 281    }
 282
 283    pipe_put_tile_rgba(color_trans, 0, 0, width, height, buf);
 284
 285    _mesa_free(buf);
 286    screen->tex_transfer_destroy(color_trans);
 287 }
 288
 289
 290 static void
 291 st_Accum(GLcontext *ctx, GLenum op, GLfloat value)
 292 {
 293    struct st_context *st = ctx->st;
 294    struct st_renderbuffer *acc_strb
 295      = st_renderbuffer(ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
 296    struct st_renderbuffer *color_strb
 297       = st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
 298
 299    const GLint xpos = ctx->DrawBuffer->_Xmin;
 300    const GLint ypos = ctx->DrawBuffer->_Ymin;
 301    const GLint width = ctx->DrawBuffer->_Xmax - xpos;
 302    const GLint height = ctx->DrawBuffer->_Ymax - ypos;
 303
 304    if(!acc_strb->data)
 305       return;
 306
 307    /* make sure color bufs aren't cached */
 308    st_flush( st, PIPE_FLUSH_RENDER_CACHE, NULL );
 309
 310    switch (op) {
 311    case GL_ADD:
 312       if (value != 0.0F) {
 313          accum_mad(ctx, 1.0, value, xpos, ypos, width, height, acc_strb);
 314       }
 315       break;
 316    case GL_MULT:
 317       if (value != 1.0F) {
 318          accum_mad(ctx, value, 0.0, xpos, ypos, width, height, acc_strb);
 319       }
 320       break;
 321    case GL_ACCUM:
 322       if (value != 0.0F) {
 323          accum_accum(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 324       }
 325       break;
 326    case GL_LOAD:
 327       accum_load(st, value, xpos, ypos, width, height, acc_strb, color_strb);
 328       break;
 329    case GL_RETURN:
 330       accum_return(ctx, value, xpos, ypos, width, height, acc_strb, color_strb);
 331       break;
 332    default:
 333       assert(0);
 334    }
 335 }
 336
 337
 338
 339 void st_init_accum_functions(struct dd_function_table *functions)
 340 {
 341    functions->Accum = st_Accum;
 342 }