src/mesa/drivers/dri/intel/intel_tex_subimage.c

   1
   2 /**************************************************************************
   3  *
   4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include "main/bufferobj.h"
  30 #include "main/macros.h"
  31 #include "main/mtypes.h"
  32 #include "main/pbo.h"
  33 #include "main/texobj.h"
  34 #include "main/texstore.h"
  35 #include "main/texcompress.h"
  36 #include "main/enums.h"
  37
  38 #include "intel_batchbuffer.h"
  39 #include "intel_context.h"
  40 #include "intel_tex.h"
  41 #include "intel_mipmap_tree.h"
  42 #include "intel_blit.h"
  43
  44 #define FILE_DEBUG_FLAG DEBUG_TEXTURE
  45
  46 static bool
  47 intel_blit_texsubimage(struct gl_context * ctx,
  48                        struct gl_texture_image *texImage,
  49                        GLint xoffset, GLint yoffset,
  50                        GLint width, GLint height,
  51                        GLenum format, GLenum type, const void *pixels,
  52                        const struct gl_pixelstore_attrib *packing)
  53 {
  54    struct intel_context *intel = intel_context(ctx);
  55    struct intel_texture_image *intelImage = intel_texture_image(texImage);
  56    GLuint dstRowStride = 0;
  57    drm_intel_bo *temp_bo = NULL;
  58    unsigned int blit_x = 0, blit_y = 0;
  59    unsigned long pitch;
  60    uint32_t tiling_mode = I915_TILING_NONE;
  61    GLubyte *dstMap;
  62
  63    /* Try to do a blit upload of the subimage if the texture is
  64     * currently busy.
  65     */
  66    if (!intelImage->mt)
  67       return false;
  68
  69    /* The blitter can't handle Y tiling */
  70    if (intelImage->mt->region->tiling == I915_TILING_Y)
  71       return false;
  72
  73    if (texImage->TexObject->Target != GL_TEXTURE_2D)
  74       return false;
  75
  76    /* On gen6, it's probably not worth swapping to the blit ring to do
  77     * this because of all the overhead involved.
  78     */
  79    if (intel->gen >= 6)
  80       return false;
  81
  82    if (!drm_intel_bo_busy(intelImage->mt->region->bo))
  83       return false;
  84
  85    DBG("BLT subimage %s target %s level %d offset %d,%d %dx%d\n",
  86        __FUNCTION__,
  87        _mesa_lookup_enum_by_nr(texImage->TexObject->Target),
  88        texImage->Level, xoffset, yoffset, width, height);
  89
  90    pixels = _mesa_validate_pbo_teximage(ctx, 2, width, height, 1,
  91                                         format, type, pixels, packing,
  92                                         "glTexSubImage");
  93    if (!pixels)
  94       return false;
  95
  96    temp_bo = drm_intel_bo_alloc_tiled(intel->bufmgr,
  97                                       "subimage blit bo",
  98                                       width, height,
  99                                       intelImage->mt->cpp,
 100                                       &tiling_mode,
 101                                       &pitch,
 102                                       0);
 103    if (temp_bo == NULL) {
 104       _mesa_error(ctx, GL_OUT_OF_MEMORY, "intelTexSubImage");
 105       return false;
 106    }
 107
 108    if (drm_intel_gem_bo_map_gtt(temp_bo)) {
 109       _mesa_error(ctx, GL_OUT_OF_MEMORY, "intelTexSubImage");
 110       return false;
 111    }
 112
 113    dstMap = temp_bo->virtual;
 114    dstRowStride = pitch;
 115
 116    intel_miptree_get_image_offset(intelImage->mt, texImage->Level,
 117                                   intelImage->base.Base.Face,
 118                                   &blit_x, &blit_y);
 119    blit_x += xoffset;
 120    blit_y += yoffset;
 121
 122    if (!_mesa_texstore(ctx, 2, texImage->_BaseFormat,
 123                        texImage->TexFormat,
 124                        dstRowStride,
 125                        &dstMap,
 126                        width, height, 1,
 127                        format, type, pixels, packing)) {
 128       _mesa_error(ctx, GL_OUT_OF_MEMORY, "intelTexSubImage");
 129    }
 130
 131    bool ret;
 132
 133    drm_intel_gem_bo_unmap_gtt(temp_bo);
 134
 135    ret = intelEmitCopyBlit(intel,
 136                            intelImage->mt->cpp,
 137                            dstRowStride,
 138                            temp_bo, 0, false,
 139                            intelImage->mt->region->pitch,
 140                            intelImage->mt->region->bo, 0,
 141                            intelImage->mt->region->tiling,
 142                            0, 0, blit_x, blit_y, width, height,
 143                            GL_COPY);
 144    assert(ret);
 145
 146    drm_intel_bo_unreference(temp_bo);
 147    _mesa_unmap_teximage_pbo(ctx, packing);
 148
 149    return true;
 150 }
 151
 152 /**
 153  * \brief A fast path for glTexImage and glTexSubImage.
 154  *
 155  * \param for_glTexImage Was this called from glTexImage or glTexSubImage?
 156  *
 157  * This fast path is taken when the hardware natively supports the texture
 158  * format (such as GL_BGRA) and when the texture memory is X-tiled. It uploads
 159  * the texture data by mapping the texture memory without a GTT fence, thus
 160  * acquiring a tiled view of the memory, and then memcpy'ing sucessive
 161  * subspans within each tile.
 162  *
 163  * This is a performance win over the conventional texture upload path because
 164  * it avoids the performance penalty of writing through the write-combine
 165  * buffer. In the conventional texture upload path,
 166  * texstore.c:store_texsubimage(), the texture memory is mapped through a GTT
 167  * fence, thus acquiring a linear view of the memory, then each row in the
 168  * image is memcpy'd. In this fast path, we replace each row's memcpy with
 169  * a sequence of memcpy's over each bit6 swizzle span in the row.
 170  *
 171  * This fast path's use case is Google Chrome's paint rectangles.  Chrome (as
 172  * of version 21) renders each page as a tiling of 256x256 GL_BGRA textures.
 173  * Each page's content is initially uploaded with glTexImage2D and damaged
 174  * regions are updated with glTexSubImage2D. On some workloads, the
 175  * performance gain of this fastpath on Sandybridge is over 5x.
 176  */
 177 bool
 178 intel_texsubimage_tiled_memcpy(struct gl_context * ctx,
 179                                GLuint dims,
 180                                struct gl_texture_image *texImage,
 181                                GLint xoffset, GLint yoffset, GLint zoffset,
 182                                GLsizei width, GLsizei height, GLsizei depth,
 183                                GLenum format, GLenum type,
 184                                const GLvoid *pixels,
 185                                const struct gl_pixelstore_attrib *packing,
 186                                bool for_glTexImage)
 187 {
 188    struct intel_context *intel = intel_context(ctx);
 189    struct intel_texture_image *image = intel_texture_image(texImage);
 190
 191    /* The miptree's buffer. */
 192    drm_intel_bo *bo;
 193
 194    int error = 0;
 195
 196    /* This fastpath is restricted to a specific texture type: level 0 of
 197     * a 2D BGRA texture. It could be generalized to support more types by
 198     * varying the arithmetic loop below.
 199     */
 200    if (!intel->has_llc ||
 201        format != GL_BGRA ||
 202        type != GL_UNSIGNED_BYTE ||
 203        texImage->TexFormat != MESA_FORMAT_ARGB8888 ||
 204        texImage->TexObject->Target != GL_TEXTURE_2D ||
 205        texImage->Level != 0 ||
 206        pixels == NULL ||
 207        _mesa_is_bufferobj(packing->BufferObj) ||
 208        packing->Alignment > 4 ||
 209        packing->SkipPixels > 0 ||
 210        packing->SkipRows > 0 ||
 211        (packing->RowLength != 0 && packing->RowLength != width) ||
 212        packing->SwapBytes ||
 213        packing->LsbFirst ||
 214        packing->Invert)
 215       return false;
 216
 217    if (for_glTexImage)
 218       ctx->Driver.AllocTextureImageBuffer(ctx, texImage);
 219
 220    if (!image->mt ||
 221        image->mt->region->tiling != I915_TILING_X) {
 222       /* The algorithm below is written only for X-tiled memory. */
 223       return false;
 224    }
 225
 226    bo = image->mt->region->bo;
 227
 228    if (drm_intel_bo_references(intel->batch.bo, bo)) {
 229       perf_debug("Flushing before mapping a referenced bo.\n");
 230       intel_batchbuffer_flush(intel);
 231    }
 232
 233    if (unlikely(intel->perf_debug)) {
 234       if (drm_intel_bo_busy(bo)) {
 235          perf_debug("Mapping a busy BO, causing a stall on the GPU.\n");
 236       }
 237    }
 238
 239    error = drm_intel_bo_map(bo, true /*write_enable*/);
 240    if (error || bo->virtual == NULL) {
 241       DBG("%s: failed to map bo\n", __FUNCTION__);
 242       return false;
 243    }
 244
 245    /* We postponed printing this message until having committed to executing
 246     * the function.
 247     */
 248    DBG("%s: level=%d offset=(%d,%d) (w,h)=(%d,%d)\n",
 249        __FUNCTION__, texImage->Level, xoffset, yoffset, width, height);
 250
 251    /* In the tiling algorithm below, some variables are in units of pixels,
 252     * others are in units of bytes, and others (such as height) are unitless.
 253     * Each variable name is suffixed with its units.
 254     */
 255
 256    const uint32_t x_max_pixels = xoffset + width;
 257    const uint32_t y_max_pixels = yoffset + height;
 258
 259    const uint32_t tile_size_bytes = 4096;
 260
 261    const uint32_t tile_width_bytes = 512;
 262    const uint32_t tile_width_pixels = 128;
 263
 264    const uint32_t tile_height = 8;
 265
 266    const uint32_t cpp = 4; /* chars per pixel of GL_BGRA */
 267    const uint32_t swizzle_width_pixels = 16;
 268
 269    const uint32_t stride_bytes = image->mt->region->pitch;
 270    const uint32_t width_tiles = stride_bytes / tile_width_bytes;
 271
 272    for (uint32_t y_pixels = yoffset; y_pixels < y_max_pixels; ++y_pixels) {
 273       const uint32_t y_offset_bytes = (y_pixels / tile_height) * width_tiles * tile_size_bytes
 274                                     + (y_pixels % tile_height) * tile_width_bytes;
 275
 276       for (uint32_t x_pixels = xoffset; x_pixels < x_max_pixels; x_pixels += swizzle_width_pixels) {
 277          const uint32_t x_offset_bytes = (x_pixels / tile_width_pixels) * tile_size_bytes
 278                                        + (x_pixels % tile_width_pixels) * cpp;
 279
 280          intptr_t offset_bytes = y_offset_bytes + x_offset_bytes;
 281          if (intel->has_swizzling) {
 282 #if 0
 283             /* Clear, unoptimized version. */
 284             bool bit6 = (offset_bytes >> 6) & 1;
 285             bool bit9 = (offset_bytes >> 9) & 1;
 286             bool bit10 = (offset_bytes >> 10) & 1;
 287
 288             if (bit9 ^ bit10)
 289                offset_bytes ^= (1 << 6);
 290 #else
 291             /* Optimized, obfuscated version. */
 292             offset_bytes ^= ((offset_bytes >> 3) ^ (offset_bytes >> 4))
 293                           & (1 << 6);
 294 #endif
 295          }
 296
 297          const uint32_t swizzle_bound_pixels = ALIGN(x_pixels + 1, swizzle_width_pixels);
 298          const uint32_t memcpy_bound_pixels = MIN2(x_max_pixels, swizzle_bound_pixels);
 299          const uint32_t copy_size = cpp * (memcpy_bound_pixels - x_pixels);
 300
 301          memcpy(bo->virtual + offset_bytes, pixels, copy_size);
 302          pixels += copy_size;
 303          x_pixels -= (x_pixels % swizzle_width_pixels);
 304       }
 305    }
 306
 307    drm_intel_bo_unmap(bo);
 308    return true;
 309 }
 310
 311 static void
 312 intelTexSubImage(struct gl_context * ctx,
 313                  GLuint dims,
 314                  struct gl_texture_image *texImage,
 315                  GLint xoffset, GLint yoffset, GLint zoffset,
 316                  GLsizei width, GLsizei height, GLsizei depth,
 317                  GLenum format, GLenum type,
 318                  const GLvoid * pixels,
 319                  const struct gl_pixelstore_attrib *packing)
 320 {
 321    bool ok;
 322
 323    ok = intel_texsubimage_tiled_memcpy(ctx, dims, texImage,
 324                                        xoffset, yoffset, zoffset,
 325                                        width, height, depth,
 326                                        format, type, pixels, packing,
 327                                        false /*for_glTexImage*/);
 328    if (ok)
 329      return;
 330
 331    /* The intel_blit_texsubimage() function only handles 2D images */
 332    if (dims != 2 || !intel_blit_texsubimage(ctx, texImage,
 333                                xoffset, yoffset,
 334                                width, height,
 335                                format, type, pixels, packing)) {
 336       _mesa_store_texsubimage(ctx, dims, texImage,
 337                               xoffset, yoffset, zoffset,
 338                               width, height, depth,
 339                               format, type, pixels, packing);
 340    }
 341 }
 342
 343 void
 344 intelInitTextureSubImageFuncs(struct dd_function_table *functions)
 345 {
 346    functions->TexSubImage = intelTexSubImage;
 347 }