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/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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 TUNGSTEN GRAPHICS 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.
*
**************************************************************************/
#ifndef _INTEL_INIT_H_
#define _INTEL_INIT_H_
#include <sys/time.h>
#include "dri_util.h"
#include "intel_bufmgr.h"
#include "i915_drm.h"
#include "xmlconfig.h"
/**
* \brief Does X driver support DRI2BufferHiz and DRI2BufferStencil?
*
* (Here, "X driver" referes to the DDX driver, xf86-video-intel).
*
* The DRI2 protocol does not allow us to query the X driver's version nor
* query for a list of buffer formats that the driver supports. So, to
* determine if the X driver supports DRI2BufferHiz and DRI2BufferStencil we
* must resort to a handshake.
*
* If the hardware lacks support for separate stencil (and consequently, lacks
* support for hiz also), then the X driver's separate stencil and hiz support
* is irrelevant and the handshake never occurs.
*
* Complications
* -------------
* The handshake is complicated by a bug in xf86-video-intel 2.15. Even though
* that version of the X driver did not supppot requests for DRI2BufferHiz or
* DRI2BufferStencil, if requested one it still allocated and returned one.
* The returned buffer, however, was incorrectly X tiled.
*
* How the handshake works
* -----------------------
* Initially, intel_screen.dri2_has_hiz is set to unknown. The first time the
* user requests a depth and stencil buffer, intelCreateBuffers() creates a
* framebuffer with separate depth and stencil attachments (with formats
* x8_z24 and s8).
*
* Eventually, intel_update_renderbuffers() makes a DRI2 request for
* DRI2BufferStencil and DRI2BufferHiz. If the stencil buffer's tiling is
* I915_TILING_NONE [1], then we joyfully set intel_screen.dri2_has_hiz to
* true and continue as if nothing happend.
*
* [1] The stencil buffer is actually W tiled. However, we request from the
* kernel a non-tiled buffer because the GTT is incapable of W fencing.
*
* If the buffers are X tiled, however, the handshake has failed and we must
* clean up.
* 1. Angrily set intel_screen.dri2_has_hiz to false.
* 2. Discard the framebuffer's depth and stencil attachments.
* 3. Attach a packed depth/stencil buffer to the framebuffer (with format
* s8_z24).
* 4. Make a DRI2 request for the new buffer, using attachment type
* DRI2BufferDepthStencil).
*
* Future Considerations
* ---------------------
* On a sunny day in the far future, when we are certain that no one has an
* xf86-video-intel installed without hiz and separate stencil support, then
* this enumerant and the handshake should die.
*/
enum intel_dri2_has_hiz {
INTEL_DRI2_HAS_HIZ_UNKNOWN,
INTEL_DRI2_HAS_HIZ_TRUE,
INTEL_DRI2_HAS_HIZ_FALSE,
};
struct intel_screen
{
int deviceID;
int gen;
int logTextureGranularity;
__DRIscreen *driScrnPriv;
GLboolean no_hw;
GLuint relaxed_relocations;
/*
* The hardware hiz and separate stencil fields are needed in intel_screen,
* rather than solely in intel_context, because glXCreatePbuffer and
* glXCreatePixmap are not passed a GLXContext.
*/
GLboolean hw_has_separate_stencil;
GLboolean hw_must_use_separate_stencil;
GLboolean hw_has_hiz;
enum intel_dri2_has_hiz dri2_has_hiz;
GLboolean no_vbo;
dri_bufmgr *bufmgr;
struct _mesa_HashTable *named_regions;
/**
* Configuration cache with default values for all contexts
*/
driOptionCache optionCache;
};
extern GLboolean intelMapScreenRegions(__DRIscreen * sPriv);
extern void intelDestroyContext(__DRIcontext * driContextPriv);
extern GLboolean intelUnbindContext(__DRIcontext * driContextPriv);
extern GLboolean
intelMakeCurrent(__DRIcontext * driContextPriv,
__DRIdrawable * driDrawPriv,
__DRIdrawable * driReadPriv);
#endif
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