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28 #ifndef _INTEL_INIT_H_
29 #define _INTEL_INIT_H_
33 #include "intel_bufmgr.h"
35 #include "xmlconfig.h"
38 * \brief Does X driver support DRI2BufferHiz and DRI2BufferStencil?
40 * (Here, "X driver" referes to the DDX driver, xf86-video-intel).
42 * The DRI2 protocol does not allow us to query the X driver's version nor
43 * query for a list of buffer formats that the driver supports. So, to
44 * determine if the X driver supports DRI2BufferHiz and DRI2BufferStencil we
45 * must resort to a handshake.
47 * If the hardware lacks support for separate stencil (and consequently, lacks
48 * support for hiz also), then the X driver's separate stencil and hiz support
49 * is irrelevant and the handshake never occurs.
53 * The handshake is complicated by a bug in xf86-video-intel 2.15. Even though
54 * that version of the X driver did not supppot requests for DRI2BufferHiz or
55 * DRI2BufferStencil, if requested one it still allocated and returned one.
56 * The returned buffer, however, was incorrectly X tiled.
58 * How the handshake works
59 * -----------------------
60 * (TODO: To be implemented on a future commit).
62 * Initially, intel_screen.dri2_has_hiz is set to unknown. The first time the
63 * user requests a depth and stencil buffer, intelCreateBuffers() creates a
64 * framebuffer with separate depth and stencil attachments (with formats
67 * Eventually, intel_update_renderbuffers() makes a DRI2 request for
68 * DRI2BufferStencil and DRI2BufferHiz. If the returned buffers are Y tiled,
69 * then we joyfully set intel_screen.dri2_has_hiz to true and continue as if
72 * If the buffers are X tiled, however, the handshake has failed and we must
74 * 1. Angrily set intel_screen.dri2_has_hiz to false.
75 * 2. Discard the framebuffer's depth and stencil attachments.
76 * 3. Attach a packed depth/stencil buffer to the framebuffer (with format
78 * 4. Make a DRI2 request for the new buffer, using attachment type
79 * DRI2BufferDepthStencil).
81 * Future Considerations
82 * ---------------------
83 * On a sunny day in the far future, when we are certain that no one has an
84 * xf86-video-intel installed without hiz and separate stencil support, then
85 * this enumerant and the handshake should die.
87 enum intel_dri2_has_hiz {
88 INTEL_DRI2_HAS_HIZ_UNKNOWN,
89 INTEL_DRI2_HAS_HIZ_TRUE,
90 INTEL_DRI2_HAS_HIZ_FALSE,
98 int logTextureGranularity;
100 __DRIscreen *driScrnPriv;
103 GLuint relaxed_relocations;
106 * The hardware hiz and separate stencil fields are needed in intel_screen,
107 * rather than solely in intel_context, because glXCreatePbuffer and
108 * glXCreatePixmap are not passed a GLXContext.
110 GLboolean hw_has_separate_stencil;
111 GLboolean hw_must_use_separate_stencil;
112 GLboolean hw_has_hiz;
113 enum intel_dri2_has_hiz dri2_has_hiz;
117 struct _mesa_HashTable *named_regions;
120 * Configuration cache with default values for all contexts
122 driOptionCache optionCache;
125 extern GLboolean intelMapScreenRegions(__DRIscreen * sPriv);
127 extern void intelDestroyContext(__DRIcontext * driContextPriv);
129 extern GLboolean intelUnbindContext(__DRIcontext * driContextPriv);
132 intelMakeCurrent(__DRIcontext * driContextPriv,
133 __DRIdrawable * driDrawPriv,
134 __DRIdrawable * driReadPriv);