--- /dev/null
+/**************************************************************************
+ *
+ * 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, NULL)) {
+ 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;
+}
projects / mesa.git / blobdiff