/**************************************************************************
*
* Copyright 2003 VMware, Inc.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
#include "main/glheader.h"
#include "main/enums.h"
#include "main/mtypes.h"
#include "main/macros.h"
#include "main/fbobject.h"
#include "main/image.h"
#include "main/bufferobj.h"
#include "main/readpix.h"
#include "main/state.h"
#include "intel_screen.h"
#include "intel_context.h"
#include "intel_blit.h"
#include "intel_buffers.h"
#include "intel_fbo.h"
#include "intel_mipmap_tree.h"
#include "intel_regions.h"
#include "intel_pixel.h"
#include "intel_buffer_objects.h"
#define FILE_DEBUG_FLAG DEBUG_PIXEL
/* For many applications, the new ability to pull the source buffers
* back out of the GTT and then do the packing/conversion operations
* in software will be as much of an improvement as trying to get the
* blitter and/or texture engine to do the work.
*
* This step is gated on private backbuffers.
*
* Obviously the frontbuffer can't be pulled back, so that is either
* an argument for blit/texture readpixels, or for blitting to a
* temporary and then pulling that back.
*
* When the destination is a pbo, however, it's not clear if it is
* ever going to be pulled to main memory (though the access param
* will be a good hint). So it sounds like we do want to be able to
* choose between blit/texture implementation on the gpu and pullback
* and cpu-based copying.
*
* Unless you can magically turn client memory into a PBO for the
* duration of this call, there will be a cpu-based copying step in
* any case.
*/
static bool
do_blit_readpixels(struct gl_context * ctx,
GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
{
struct intel_context *intel = intel_context(ctx);
struct intel_buffer_object *dst = intel_buffer_object(pack->BufferObj);
GLuint dst_offset;
drm_intel_bo *dst_buffer;
GLint dst_x, dst_y;
GLuint dirty;
DBG("%s\n", __func__);
assert(_mesa_is_bufferobj
(pack
->BufferObj
));
struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer;
struct intel_renderbuffer *irb = intel_renderbuffer(rb);
if (ctx->_ImageTransferState ||
!_mesa_format_matches_format_and_type(irb->mt->format, format, type,
false)) {
DBG("%s - bad format for blit\n", __func__);
return false;
}
if (pack->SwapBytes || pack->LsbFirst) {
DBG("%s: bad packing params\n", __func__);
return false;
}
int dst_stride = _mesa_image_row_stride(pack, width, format, type);
bool dst_flip = false;
/* Mesa flips the dst_stride for pack->Invert, but we want our mt to have a
* normal dst_stride.
*/
if (pack->Invert) {
dst_stride = -dst_stride;
dst_flip = true;
}
dst_offset = (GLintptr)pixels;
dst_offset += _mesa_image_offset(2, pack, width, height,
format, type, 0, 0, 0);
if (!_mesa_clip_copytexsubimage(ctx,
&dst_x, &dst_y,
&x, &y,
&width, &height)) {
return true;
}
dirty = intel->front_buffer_dirty;
intel_prepare_render(intel);
intel->front_buffer_dirty = dirty;
dst_buffer = intel_bufferobj_buffer(intel, dst);
struct intel_mipmap_tree *pbo_mt =
intel_miptree_create_for_bo(intel,
dst_buffer,
irb->mt->format,
dst_offset,
width, height,
dst_stride, I915_TILING_NONE);
if (!intel_miptree_blit(intel,
irb->mt, irb->mt_level, irb->mt_layer,
x, y, _mesa_is_winsys_fbo(ctx->ReadBuffer),
pbo_mt, 0, 0,
0, 0, dst_flip,
width, height, GL_COPY)) {
intel_miptree_release(&pbo_mt);
return false;
}
intel_miptree_release(&pbo_mt);
DBG("%s - DONE\n", __func__);
return true;
}
void
intelReadPixels(struct gl_context * ctx,
GLint x, GLint y, GLsizei width, GLsizei height,
GLenum format, GLenum type,
const struct gl_pixelstore_attrib *pack, GLvoid * pixels)
{
struct intel_context *intel = intel_context(ctx);
bool dirty;
intel_flush_rendering_to_batch(ctx);
DBG("%s\n", __func__);
if (_mesa_is_bufferobj(pack->BufferObj)) {
/* Using PBOs, so try the BLT based path. */
if (do_blit_readpixels(ctx, x, y, width, height, format, type, pack,
pixels)) {
return;
}
perf_debug("%s: fallback to CPU mapping in PBO case\n", __func__);
}
/* glReadPixels() wont dirty the front buffer, so reset the dirty
* flag after calling intel_prepare_render(). */
dirty = intel->front_buffer_dirty;
intel_prepare_render(intel);
intel->front_buffer_dirty = dirty;
/* Update Mesa state before calling _mesa_readpixels().
* XXX this may not be needed since ReadPixels no longer uses the
* span code.
*/
if (ctx->NewState)
_mesa_update_state(ctx);
_mesa_readpixels(ctx, x, y, width, height, format, type, pack, pixels);
/* There's an intel_prepare_render() call in intelSpanRenderStart(). */
intel->front_buffer_dirty = dirty;
}