1 /**********************************************************
2 * Copyright 2010 VMware, Inc. All rights reserved.
4 * Permission is hereby granted, free of charge, to any person
5 * obtaining a copy of this software and associated documentation
6 * files (the "Software"), to deal in the Software without
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8 * modify, merge, publish, distribute, sublicense, and/or sell copies
9 * of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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20 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
24 **********************************************************/
30 #include "pipe/p_compiler.h"
31 #include "pipe/p_format.h"
34 * \file API for communication between state trackers and state tracker
37 * While both are state tackers, we use the term state tracker for rendering
38 * APIs such as OpenGL or OpenVG, and state tracker manager for window system
39 * APIs such as EGL or GLX in this file.
41 * This file defines an API to be implemented by both state trackers and state
46 * The supported rendering API of a state tracker.
58 * Used in st_context_iface->teximage.
60 enum st_texture_type
{
68 * Available attachments of framebuffer.
70 enum st_attachment_type
{
71 ST_ATTACHMENT_FRONT_LEFT
,
72 ST_ATTACHMENT_BACK_LEFT
,
73 ST_ATTACHMENT_FRONT_RIGHT
,
74 ST_ATTACHMENT_BACK_RIGHT
,
75 ST_ATTACHMENT_DEPTH_STENCIL
,
80 ST_ATTACHMENT_INVALID
= -1
83 /* for buffer_mask in st_visual */
84 #define ST_ATTACHMENT_FRONT_LEFT_MASK (1 << ST_ATTACHMENT_FRONT_LEFT)
85 #define ST_ATTACHMENT_BACK_LEFT_MASK (1 << ST_ATTACHMENT_BACK_LEFT)
86 #define ST_ATTACHMENT_FRONT_RIGHT_MASK (1 << ST_ATTACHMENT_FRONT_RIGHT)
87 #define ST_ATTACHMENT_BACK_RIGHT_MASK (1 << ST_ATTACHMENT_BACK_RIGHT)
88 #define ST_ATTACHMENT_DEPTH_STENCIL_MASK (1 << ST_ATTACHMENT_DEPTH_STENCIL)
89 #define ST_ATTACHMENT_ACCUM_MASK (1 << ST_ATTACHMENT_ACCUM)
90 #define ST_ATTACHMENT_SAMPLE_MASK (1 << ST_ATTACHMENT_SAMPLE)
93 * Enumerations of state tracker context resources.
95 enum st_context_resource_type
{
96 ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D
,
97 ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D
,
98 ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X
,
99 ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X
,
100 ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y
,
101 ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y
,
102 ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z
,
103 ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z
,
104 ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER
,
105 ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE
109 * Value to st_manager->get_param function.
111 enum st_manager_param
{
113 * The dri state tracker on old libGL's doesn't do the right thing
114 * with regards to invalidating the framebuffers.
116 * For the mesa state tracker that means that it needs to invalidate
117 * the framebuffer in glViewport itself.
119 ST_MANAGER_BROKEN_INVALIDATE
123 * The return type of st_api->get_proc_address.
125 typedef void (*st_proc_t
)(void);
128 struct pipe_resource
;
129 struct pipe_fence_handle
;
132 * Used in st_context_iface->get_resource_for_egl_image.
134 struct st_context_resource
136 /* these fields are filled by the caller */
137 enum st_context_resource_type type
;
140 /* this is owned by the caller */
141 struct pipe_resource
*texture
;
145 * Used in st_manager_iface->get_egl_image.
149 /* this is owned by the caller */
150 struct pipe_resource
*texture
;
158 * Represent the visual of a framebuffer.
163 * Available buffers. Tested with ST_FRAMEBUFFER_*_MASK.
165 unsigned buffer_mask
;
168 * Buffer formats. The formats are always set even when the buffer is
171 enum pipe_format color_format
;
172 enum pipe_format depth_stencil_format
;
173 enum pipe_format accum_format
;
177 * Desired render buffer.
179 enum st_attachment_type render_buffer
;
183 * Represent a windowing system drawable.
185 * The framebuffer is implemented by the state tracker manager and
186 * used by the state trackers.
188 * Instead of the winsys pokeing into the API context to figure
189 * out what buffers that might be needed in the future by the API
190 * context, it calls into the framebuffer to get the textures.
192 * This structure along with the notify_invalid_framebuffer
193 * allows framebuffers to be shared between different threads
194 * but at the same make the API context free from thread
195 * syncronisation primitves, with the exception of a small
196 * atomic flag used for notification of framebuffer dirty status.
198 * The thread syncronisation is put inside the framebuffer
199 * and only called once the framebuffer has become dirty.
201 struct st_framebuffer_iface
204 * Available for the state tracker manager to use.
206 void *st_manager_private
;
209 * The visual of a framebuffer.
211 const struct st_visual
*visual
;
214 * Flush the front buffer.
216 * On some window systems, changes to the front buffers are not immediately
217 * visible. They need to be flushed.
219 * @att is one of the front buffer attachments.
221 boolean (*flush_front
)(struct st_framebuffer_iface
*stfbi
,
222 enum st_attachment_type statt
);
225 * The state tracker asks for the textures it needs.
227 * It should try to only ask for attachments that it currently renders
228 * to, thus allowing the winsys to delay the allocation of textures not
229 * needed. For example front buffer attachments are not needed if you
230 * only do back buffer rendering.
232 * The implementor of this function needs to also ensure
233 * thread safty as this call might be done from multiple threads.
235 * The returned textures are owned by the caller. They should be
236 * unreferenced when no longer used. If this function is called multiple
237 * times with different sets of attachments, those buffers not included in
238 * the last call might be destroyed. This behavior might change in the
241 boolean (*validate
)(struct st_framebuffer_iface
*stfbi
,
242 const enum st_attachment_type
*statts
,
244 struct pipe_resource
**out
);
248 * Represent a rendering context.
250 * This entity is created from st_api and used by the state tracker manager.
252 struct st_context_iface
255 * Available for the state tracker and the manager to use.
257 void *st_context_private
;
258 void *st_manager_private
;
261 * Destroy the context.
263 void (*destroy
)(struct st_context_iface
*stctxi
);
266 * Invalidate the current textures that was taken from a framebuffer.
268 * The state tracker manager calls this function to let the rendering
269 * context know that it should update the textures it got from
270 * st_framebuffer_iface::validate. It should do so at the latest time possible.
271 * Possible right before sending triangles to the pipe context.
273 * For certain platforms this function might be called from a thread other
274 * than the thread that the context is currently bound in, and must
275 * therefore be thread safe. But it is the state tracker manager's
276 * responsibility to make sure that the framebuffer is bound to the context
277 * and the API context is current for the duration of this call.
279 * Thus reducing the sync primitive needed to a single atomic flag.
281 void (*notify_invalid_framebuffer
)(struct st_context_iface
*stctxi
,
282 struct st_framebuffer_iface
*stfbi
);
285 * Flush all drawing from context to the pipe also flushes the pipe.
287 void (*flush
)(struct st_context_iface
*stctxi
, unsigned flags
,
288 struct pipe_fence_handle
**fence
);
291 * Replace the texture image of a texture object at the specified level.
293 * This function is optional.
295 boolean (*teximage
)(struct st_context_iface
*stctxi
, enum st_texture_type target
,
296 int level
, enum pipe_format internal_format
,
297 struct pipe_resource
*tex
, boolean mipmap
);
300 * Used to implement glXCopyContext.
302 void (*copy
)(struct st_context_iface
*stctxi
,
303 struct st_context_iface
*stsrci
, unsigned mask
);
306 * Look up and return the info of a resource for EGLImage.
308 * This function is optional.
310 boolean (*get_resource_for_egl_image
)(struct st_context_iface
*stctxi
,
311 struct st_context_resource
*stres
);
316 * Represent a state tracker manager.
318 * This interface is implemented by the state tracker manager. It corresponds
319 * to a "display" in the window system.
323 struct pipe_screen
*screen
;
326 * Look up and return the info of an EGLImage.
328 * This is used to implement for example EGLImageTargetTexture2DOES.
329 * The GLeglImageOES agrument of that call is passed directly to this
330 * function call and the information needed to access this is returned
331 * in the given struct out.
333 * @smapi: manager owning the caller context
334 * @stctx: caller context
335 * @egl_image: EGLImage that caller recived
336 * @out: return struct filled out with access information.
338 * This function is optional.
340 boolean (*get_egl_image
)(struct st_manager
*smapi
,
341 struct st_context_iface
*stctx
,
343 struct st_egl_image
*out
);
346 * Query an manager param.
348 int (*get_param
)(struct st_manager
*smapi
,
349 enum st_manager_param param
);
353 * Represent a rendering API such as OpenGL or OpenVG.
355 * Implemented by the state tracker and used by the state tracker manager.
362 void (*destroy
)(struct st_api
*stapi
);
365 * Return an API entry point.
367 * For GL this is the same as _glapi_get_proc_address.
369 st_proc_t (*get_proc_address
)(struct st_api
*stapi
, const char *procname
);
372 * Return true if the visual is supported by the state tracker.
374 boolean (*is_visual_supported
)(struct st_api
*stapi
,
375 const struct st_visual
*visual
);
378 * Create a rendering context.
380 struct st_context_iface
*(*create_context
)(struct st_api
*stapi
,
381 struct st_manager
*smapi
,
382 const struct st_visual
*visual
,
383 struct st_context_iface
*stsharei
);
386 * Bind the context to the calling thread with draw and read as drawables.
388 * The framebuffers might have different visuals than the context does.
390 boolean (*make_current
)(struct st_api
*stapi
,
391 struct st_context_iface
*stctxi
,
392 struct st_framebuffer_iface
*stdrawi
,
393 struct st_framebuffer_iface
*streadi
);
396 * Get the currently bound context in the calling thread.
398 struct st_context_iface
*(*get_current
)(struct st_api
*stapi
);
402 * Return true if the visual has the specified buffers.
404 static INLINE boolean
405 st_visual_have_buffers(const struct st_visual
*visual
, unsigned mask
)
407 return ((visual
->buffer_mask
& mask
) == mask
);
410 /* these symbols may need to be dynamically lookup up */
411 extern PUBLIC
struct st_api
* st_api_create_OpenGL(void);
412 extern PUBLIC
struct st_api
* st_api_create_OpenGL_ES1(void);
413 extern PUBLIC
struct st_api
* st_api_create_OpenGL_ES2(void);
414 extern PUBLIC
struct st_api
* st_api_create_OpenVG(void);
417 * The entry points of the state trackers.
419 #define ST_CREATE_OPENGL_SYMBOL "st_api_create_OpenGL"
420 #define ST_CREATE_OPENGL_ES1_SYMBOL "st_api_create_OpenGL_ES1"
421 #define ST_CREATE_OPENGL_ES2_SYMBOL "st_api_create_OpenGL_ES2"
422 #define ST_CREATE_OPENVG_SYMBOL "st_api_create_OpenVG"
424 #endif /* _ST_API_H_ */