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cb146dc515
Mesa before version 8.0.2 has a slow read pixels path that gets used with the Intel driver where it converts all of the pixels into a floating point representation and back even if the data is being read into exactly the same format. There is however a faster path using the blitter when reading into a PBO with BGRA format. It works out faster to read into a PBO and then memcpy back out into the application's buffer even though it adds an extra memcpy. This patch adds a workaround in cogl_framebuffer_read_pixels_into_bitmap when it detects this situation. In that case it will create a temporary CoglBitmap using cogl_bitmap_new_with_size, read into it and then memcpy the data back out. The main impetus for this patch is that Gnome Shell has implemented this workaround directly using GL calls but it seems like the kind of thing that would sit better at the Cogl layer. Reviewed-by: Robert Bragg <robert@linux.intel.com>
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2012 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __COGL_GPU_INFO_PRIVATE_H
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#define __COGL_GPU_INFO_PRIVATE_H
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#include "cogl-context.h"
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typedef enum
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{
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COGL_GPU_INFO_VENDOR_UNKNOWN,
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COGL_GPU_INFO_VENDOR_INTEL
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} CoglGpuInfoVendor;
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typedef enum
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{
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COGL_GPU_INFO_DRIVER_PACKAGE_UNKNOWN,
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COGL_GPU_INFO_DRIVER_PACKAGE_MESA
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} CoglGpuInfoDriverPackage;
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typedef enum
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{
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/* If this bug is present then it is faster to read pixels into a
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* PBO and then memcpy out of the PBO into system memory rather than
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* directly read into system memory.
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* https://bugs.freedesktop.org/show_bug.cgi?id=46631
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*/
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COGL_GPU_INFO_DRIVER_BUG_MESA_46631_SLOW_READ_PIXELS = 1 << 0
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} CoglGpuInfoDriverBug;
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typedef struct _CoglGpuInfoVersion CoglGpuInfoVersion;
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typedef struct _CoglGpuInfo CoglGpuInfo;
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struct _CoglGpuInfo
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{
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CoglGpuInfoVendor vendor;
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const char *vendor_name;
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CoglGpuInfoDriverPackage driver_package;
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const char *driver_package_name;
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int driver_package_version;
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CoglGpuInfoDriverBug driver_bugs;
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};
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/*
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* _cogl_gpu_info_init:
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* @ctx: A #CoglContext
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* @gpu: A return location for the GPU information
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*
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* Determines information about the GPU and driver from the given
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* context.
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*/
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void
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_cogl_gpu_info_init (CoglContext *ctx,
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CoglGpuInfo *gpu);
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#endif /* __COGL_GPU_INFO_PRIVATE_H */
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