| /* |
| * 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, sublicense, 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 NONINFRINGEMENT. |
| * 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/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 "main/glformats.h" |
| #include "drivers/common/meta.h" |
| |
| #include "brw_context.h" |
| #include "intel_screen.h" |
| #include "intel_batchbuffer.h" |
| #include "intel_blit.h" |
| #include "intel_buffers.h" |
| #include "intel_fbo.h" |
| #include "intel_mipmap_tree.h" |
| #include "intel_pixel.h" |
| #include "intel_buffer_objects.h" |
| #include "intel_tiled_memcpy.h" |
| |
| #define FILE_DEBUG_FLAG DEBUG_PIXEL |
| |
| /** |
| * \brief A fast path for glReadPixels |
| * |
| * This fast path is taken when the source format is BGRA, RGBA, |
| * A or L and when the texture memory is X- or Y-tiled. It downloads |
| * the source data by directly mapping the memory without a GTT fence. |
| * This then needs to be de-tiled on the CPU before presenting the data to |
| * the user in the linear fasion. |
| * |
| * This is a performance win over the conventional texture download path. |
| * In the conventional texture download path, the texture is either mapped |
| * through the GTT or copied to a linear buffer with the blitter before |
| * handing off to a software path. This allows us to avoid round-tripping |
| * through the GPU (in the case where we would be blitting) and do only a |
| * single copy operation. |
| */ |
| static bool |
| intel_readpixels_tiled_memcpy(struct gl_context * ctx, |
| GLint xoffset, GLint yoffset, |
| GLsizei width, GLsizei height, |
| GLenum format, GLenum type, |
| GLvoid * pixels, |
| const struct gl_pixelstore_attrib *pack) |
| { |
| struct brw_context *brw = brw_context(ctx); |
| struct gl_renderbuffer *rb = ctx->ReadBuffer->_ColorReadBuffer; |
| |
| /* This path supports reading from color buffers only */ |
| if (rb == NULL) |
| return false; |
| |
| struct intel_renderbuffer *irb = intel_renderbuffer(rb); |
| int dst_pitch; |
| |
| /* The miptree's buffer. */ |
| drm_intel_bo *bo; |
| |
| int error = 0; |
| |
| uint32_t cpp; |
| mem_copy_fn mem_copy = NULL; |
| |
| /* This fastpath is restricted to specific renderbuffer types: |
| * a 2D BGRA, RGBA, L8 or A8 texture. It could be generalized to support |
| * more types. |
| */ |
| if (!brw->has_llc || |
| !(type == GL_UNSIGNED_BYTE || type == GL_UNSIGNED_INT_8_8_8_8_REV) || |
| pixels == NULL || |
| _mesa_is_bufferobj(pack->BufferObj) || |
| pack->Alignment > 4 || |
| pack->SkipPixels > 0 || |
| pack->SkipRows > 0 || |
| (pack->RowLength != 0 && pack->RowLength != width) || |
| pack->SwapBytes || |
| pack->LsbFirst || |
| pack->Invert) |
| return false; |
| |
| /* Only a simple blit, no scale, bias or other mapping. */ |
| if (ctx->_ImageTransferState) |
| return false; |
| |
| /* It is possible that the renderbuffer (or underlying texture) is |
| * multisampled. Since ReadPixels from a multisampled buffer requires a |
| * multisample resolve, we can't handle this here |
| */ |
| if (rb->NumSamples > 1) |
| return false; |
| |
| /* We can't handle copying from RGBX or BGRX because the tiled_memcpy |
| * function doesn't set the last channel to 1. Note this checks BaseFormat |
| * rather than TexFormat in case the RGBX format is being simulated with an |
| * RGBA format. |
| */ |
| if (rb->_BaseFormat == GL_RGB) |
| return false; |
| |
| if (!intel_get_memcpy(rb->Format, format, type, &mem_copy, &cpp)) |
| return false; |
| |
| if (!irb->mt || |
| (irb->mt->tiling != I915_TILING_X && |
| irb->mt->tiling != I915_TILING_Y)) { |
| /* The algorithm is written only for X- or Y-tiled memory. */ |
| return false; |
| } |
| |
| /* Since we are going to read raw data to the miptree, we need to resolve |
| * any pending fast color clears before we start. |
| */ |
| intel_miptree_all_slices_resolve_color(brw, irb->mt, 0); |
| |
| bo = irb->mt->bo; |
| |
| if (drm_intel_bo_references(brw->batch.bo, bo)) { |
| perf_debug("Flushing before mapping a referenced bo.\n"); |
| intel_batchbuffer_flush(brw); |
| } |
| |
| error = brw_bo_map(brw, bo, false /* write enable */, "miptree"); |
| if (error) { |
| DBG("%s: failed to map bo\n", __func__); |
| return false; |
| } |
| |
| xoffset += irb->mt->level[irb->mt_level].slice[irb->mt_layer].x_offset; |
| yoffset += irb->mt->level[irb->mt_level].slice[irb->mt_layer].y_offset; |
| |
| dst_pitch = _mesa_image_row_stride(pack, width, format, type); |
| |
| /* For a window-system renderbuffer, the buffer is actually flipped |
| * vertically, so we need to handle that. Since the detiling function |
| * can only really work in the forwards direction, we have to be a |
| * little creative. First, we compute the Y-offset of the first row of |
| * the renderbuffer (in renderbuffer coordinates). We then match that |
| * with the last row of the client's data. Finally, we give |
| * tiled_to_linear a negative pitch so that it walks through the |
| * client's data backwards as it walks through the renderbufer forwards. |
| */ |
| if (rb->Name == 0) { |
| yoffset = rb->Height - yoffset - height; |
| pixels += (ptrdiff_t) (height - 1) * dst_pitch; |
| dst_pitch = -dst_pitch; |
| } |
| |
| /* We postponed printing this message until having committed to executing |
| * the function. |
| */ |
| DBG("%s: x,y=(%d,%d) (w,h)=(%d,%d) format=0x%x type=0x%x " |
| "mesa_format=0x%x tiling=%d " |
| "pack=(alignment=%d row_length=%d skip_pixels=%d skip_rows=%d)\n", |
| __func__, xoffset, yoffset, width, height, |
| format, type, rb->Format, irb->mt->tiling, |
| pack->Alignment, pack->RowLength, pack->SkipPixels, |
| pack->SkipRows); |
| |
| tiled_to_linear( |
| xoffset * cpp, (xoffset + width) * cpp, |
| yoffset, yoffset + height, |
| pixels - (ptrdiff_t) yoffset * dst_pitch - (ptrdiff_t) xoffset * cpp, |
| bo->virtual + irb->mt->offset, |
| dst_pitch, irb->mt->pitch, |
| brw->has_swizzling, |
| irb->mt->tiling, |
| mem_copy |
| ); |
| |
| drm_intel_bo_unmap(bo); |
| 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) |
| { |
| bool ok; |
| |
| struct brw_context *brw = brw_context(ctx); |
| bool dirty; |
| |
| DBG("%s\n", __func__); |
| |
| if (_mesa_is_bufferobj(pack->BufferObj)) { |
| if (_mesa_meta_pbo_GetTexSubImage(ctx, 2, NULL, x, y, 0, width, height, 1, |
| format, type, pixels, pack)) { |
| /* _mesa_meta_pbo_GetTexSubImage() implements PBO transfers by |
| * binding the user-provided BO as a fake framebuffer and rendering |
| * to it. This breaks the invariant of the GL that nothing is able |
| * to render to a BO, causing nondeterministic corruption issues |
| * because the render cache is not coherent with a number of other |
| * caches that the BO could potentially be bound to afterwards. |
| * |
| * This could be solved in the same way that we guarantee texture |
| * coherency after a texture is attached to a framebuffer and |
| * rendered to, but that would involve checking *all* BOs bound to |
| * the pipeline for the case we need to emit a cache flush due to |
| * previous rendering to any of them -- Including vertex, index, |
| * uniform, atomic counter, shader image, transform feedback, |
| * indirect draw buffers, etc. |
| * |
| * That would increase the per-draw call overhead even though it's |
| * very unlikely that any of the BOs bound to the pipeline has been |
| * rendered to via a PBO at any point, so it seems better to just |
| * flush here unconditionally. |
| */ |
| brw_emit_mi_flush(brw); |
| return; |
| } |
| |
| perf_debug("%s: fallback to CPU mapping in PBO case\n", __func__); |
| } |
| |
| ok = intel_readpixels_tiled_memcpy(ctx, x, y, width, height, |
| format, type, pixels, pack); |
| if(ok) |
| return; |
| |
| /* glReadPixels() wont dirty the front buffer, so reset the dirty |
| * flag after calling intel_prepare_render(). */ |
| dirty = brw->front_buffer_dirty; |
| intel_prepare_render(brw); |
| brw->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(). */ |
| brw->front_buffer_dirty = dirty; |
| } |
