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

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 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 #include "main/glheader.h"
  29 #include "main/enums.h"
  30 #include "main/mtypes.h"
  31 #include "main/macros.h"
  32 #include "main/image.h"
  33 #include "main/bufferobj.h"
  34 #include "main/state.h"
  35 #include "swrast/swrast.h"
  36
  37 #include "intel_screen.h"
  38 #include "intel_context.h"
  39 #include "intel_blit.h"
  40 #include "intel_buffers.h"
  41 #include "intel_regions.h"
  42 #include "intel_pixel.h"
  43 #include "intel_buffer_objects.h"
  44
  45 /* For many applications, the new ability to pull the source buffers
  46  * back out of the GTT and then do the packing/conversion operations
  47  * in software will be as much of an improvement as trying to get the
  48  * blitter and/or texture engine to do the work.
  49  *
  50  * This step is gated on private backbuffers.
  51  *
  52  * Obviously the frontbuffer can't be pulled back, so that is either
  53  * an argument for blit/texture readpixels, or for blitting to a
  54  * temporary and then pulling that back.
  55  *
  56  * When the destination is a pbo, however, it's not clear if it is
  57  * ever going to be pulled to main memory (though the access param
  58  * will be a good hint).  So it sounds like we do want to be able to
  59  * choose between blit/texture implementation on the gpu and pullback
  60  * and cpu-based copying.
  61  *
  62  * Unless you can magically turn client memory into a PBO for the
  63  * duration of this call, there will be a cpu-based copying step in
  64  * any case.
  65  */
  66
  67
  68 static GLboolean
  69 do_texture_readpixels(GLcontext * ctx,
  70                       GLint x, GLint y, GLsizei width, GLsizei height,
  71                       GLenum format, GLenum type,
  72                       const struct gl_pixelstore_attrib *pack,
  73                       struct intel_region *dest_region)
  74 {
  75 #if 0
  76    struct intel_context *intel = intel_context(ctx);
  77    intelScreenPrivate *screen = intel->intelScreen;
  78    GLint pitch = pack->RowLength ? pack->RowLength : width;
  79    __DRIdrawable *dPriv = intel->driDrawable;
  80    int textureFormat;
  81    GLenum glTextureFormat;
  82    int destFormat, depthFormat, destPitch;
  83    drm_clip_rect_t tmp;
  84
  85    if (INTEL_DEBUG & DEBUG_PIXEL)
  86       fprintf(stderr, "%s\n", __FUNCTION__);
  87
  88
  89    if (ctx->_ImageTransferState ||
  90        pack->SwapBytes || pack->LsbFirst || !pack->Invert) {
  91       if (INTEL_DEBUG & DEBUG_PIXEL)
  92          fprintf(stderr, "%s: check_color failed\n", __FUNCTION__);
  93       return GL_FALSE;
  94    }
  95
  96    intel->vtbl.meta_texrect_source(intel, intel_readbuf_region(intel));
  97
  98    if (!intel->vtbl.meta_render_dest(intel, dest_region, type, format)) {
  99       if (INTEL_DEBUG & DEBUG_PIXEL)
 100          fprintf(stderr, "%s: couldn't set dest %s/%s\n",
 101                  __FUNCTION__,
 102                  _mesa_lookup_enum_by_nr(type),
 103                  _mesa_lookup_enum_by_nr(format));
 104       return GL_FALSE;
 105    }
 106
 107    if (intel->driDrawable->numClipRects) {
 108       intel->vtbl.install_meta_state(intel);
 109       intel->vtbl.meta_no_depth_write(intel);
 110       intel->vtbl.meta_no_stencil_write(intel);
 111
 112       if (!driClipRectToFramebuffer(ctx->ReadBuffer, &x, &y, &width, &height)) {
 113          SET_STATE(i830, state);
 114          if (INTEL_DEBUG & DEBUG_PIXEL)
 115             fprintf(stderr, "%s: cliprect failed\n", __FUNCTION__);
 116          return GL_TRUE;
 117       }
 118
 119       y = dPriv->h - y - height;
 120       x += dPriv->x;
 121       y += dPriv->y;
 122
 123
 124       /* Set the frontbuffer up as a large rectangular texture.
 125        */
 126       intel->vtbl.meta_tex_rect_source(intel, src_region, textureFormat);
 127
 128
 129       intel->vtbl.meta_texture_blend_replace(i830, glTextureFormat);
 130
 131
 132       /* Set the 3d engine to draw into the destination region:
 133        */
 134
 135       intel->vtbl.meta_draw_region(intel, dest_region);
 136       intel->vtbl.meta_draw_format(intel, destFormat, depthFormat);     /* ?? */
 137
 138
 139       /* Draw a single quad, no cliprects:
 140        */
 141       intel->vtbl.meta_disable_cliprects(intel);
 142
 143       intel->vtbl.draw_quad(intel,
 144                             0, width, 0, height,
 145                             0x00ff00ff, x, x + width, y, y + height);
 146
 147       intel->vtbl.leave_meta_state(intel);
 148    }
 149
 150    intel_region_wait_fence(ctx, dest_region);   /* required by GL */
 151    return GL_TRUE;
 152 #endif
 153
 154    return GL_FALSE;
 155 }
 156
 157
 158
 159
 160 static GLboolean
 161 do_blit_readpixels(GLcontext * ctx,
 162                    GLint x, GLint y, GLsizei width, GLsizei height,
 163                    GLenum format, GLenum type,
 164                    const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
 165 {
 166    struct intel_context *intel = intel_context(ctx);
 167    struct intel_region *src = intel_readbuf_region(intel);
 168    struct intel_buffer_object *dst = intel_buffer_object(pack->BufferObj);
 169    GLuint dst_offset;
 170    GLuint rowLength;
 171
 172    if (INTEL_DEBUG & DEBUG_PIXEL)
 173       _mesa_printf("%s\n", __FUNCTION__);
 174
 175    if (!src)
 176       return GL_FALSE;
 177
 178    if (!_mesa_is_bufferobj(pack->BufferObj)) {
 179       /* PBO only for now:
 180        */
 181       if (INTEL_DEBUG & DEBUG_PIXEL)
 182          _mesa_printf("%s - not PBO\n", __FUNCTION__);
 183       return GL_FALSE;
 184    }
 185
 186
 187    if (ctx->_ImageTransferState ||
 188        !intel_check_blit_format(src, format, type)) {
 189       if (INTEL_DEBUG & DEBUG_PIXEL)
 190          _mesa_printf("%s - bad format for blit\n", __FUNCTION__);
 191       return GL_FALSE;
 192    }
 193
 194    if (pack->Alignment != 1 || pack->SwapBytes || pack->LsbFirst) {
 195       if (INTEL_DEBUG & DEBUG_PIXEL)
 196          _mesa_printf("%s: bad packing params\n", __FUNCTION__);
 197       return GL_FALSE;
 198    }
 199
 200    if (pack->RowLength > 0)
 201       rowLength = pack->RowLength;
 202    else
 203       rowLength = width;
 204
 205    if (pack->Invert) {
 206       if (INTEL_DEBUG & DEBUG_PIXEL)
 207          _mesa_printf("%s: MESA_PACK_INVERT not done yet\n", __FUNCTION__);
 208       return GL_FALSE;
 209    }
 210    else {
 211       rowLength = -rowLength;
 212    }
 213
 214    dst_offset = (GLintptr) _mesa_image_address(2, pack, pixels, width, height,
 215                                                format, type, 0, 0, 0);
 216
 217
 218    /* Although the blits go on the command buffer, need to do this and
 219     * fire with lock held to guarentee cliprects are correct.
 220     */
 221    intelFlush(&intel->ctx);
 222
 223    if (intel->driReadDrawable->numClipRects) {
 224       GLboolean all = (width * height * src->cpp == dst->Base.Size &&
 225                        x == 0 && dst_offset == 0);
 226
 227       dri_bo *dst_buffer = intel_bufferobj_buffer(intel, dst,
 228                                                   all ? INTEL_WRITE_FULL :
 229                                                   INTEL_WRITE_PART);
 230       __DRIdrawable *dPriv = intel->driReadDrawable;
 231       int nbox = dPriv->numClipRects;
 232       drm_clip_rect_t *box = dPriv->pClipRects;
 233       drm_clip_rect_t rect;
 234       drm_clip_rect_t src_rect;
 235       int i;
 236
 237       src_rect.x1 = dPriv->x + x;
 238       src_rect.y1 = dPriv->y + dPriv->h - (y + height);
 239       src_rect.x2 = src_rect.x1 + width;
 240       src_rect.y2 = src_rect.y1 + height;
 241
 242
 243
 244       for (i = 0; i < nbox; i++) {
 245          if (!intel_intersect_cliprects(&rect, &src_rect, &box[i]))
 246             continue;
 247
 248          if (!intelEmitCopyBlit(intel,
 249                                 src->cpp,
 250                                 src->pitch, src->buffer, 0, src->tiling,
 251                                 rowLength, dst_buffer, dst_offset, GL_FALSE,
 252                                 rect.x1,
 253                                 rect.y1,
 254                                 rect.x1 - src_rect.x1,
 255                                 rect.y2 - src_rect.y2,
 256                                 rect.x2 - rect.x1, rect.y2 - rect.y1,
 257                                 GL_COPY)) {
 258             return GL_FALSE;
 259          }
 260       }
 261    }
 262
 263    if (INTEL_DEBUG & DEBUG_PIXEL)
 264       _mesa_printf("%s - DONE\n", __FUNCTION__);
 265
 266    return GL_TRUE;
 267 }
 268
 269 void
 270 intelReadPixels(GLcontext * ctx,
 271                 GLint x, GLint y, GLsizei width, GLsizei height,
 272                 GLenum format, GLenum type,
 273                 const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
 274 {
 275    if (INTEL_DEBUG & DEBUG_PIXEL)
 276       fprintf(stderr, "%s\n", __FUNCTION__);
 277
 278    intelFlush(ctx);
 279
 280    if (do_blit_readpixels
 281        (ctx, x, y, width, height, format, type, pack, pixels))
 282       return;
 283
 284 #ifdef I915
 285    if (do_texture_readpixels
 286        (ctx, x, y, width, height, format, type, pack, pixels))
 287       return;
 288 #else
 289    (void)do_blit_readpixels;
 290    (void)do_texture_readpixels;
 291 #endif
 292
 293    if (INTEL_DEBUG & DEBUG_PIXEL)
 294       _mesa_printf("%s: fallback to swrast\n", __FUNCTION__);
 295
 296    /* Update Mesa state before calling down into _swrast_ReadPixels, as
 297     * the spans code requires the computed buffer states to be up to date,
 298     * but _swrast_ReadPixels only updates Mesa state after setting up
 299     * the spans code.
 300     */
 301
 302    if (ctx->NewState)
 303       _mesa_update_state(ctx);
 304
 305    _swrast_ReadPixels(ctx, x, y, width, height, format, type, pack, pixels);
 306 }