/**********************************************************
* Copyright 2010 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 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 THE AUTHORS OR COPYRIGHT HOLDERS
* 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 _ST_API_H_
#define _ST_API_H_
#include "pipe/p_compiler.h"
#include "pipe/p_format.h"
/**
* \file API for communication between state trackers and state tracker
* managers.
*
* While both are state tackers, we use the term state tracker for rendering
* APIs such as OpenGL or OpenVG, and state tracker manager for window system
* APIs such as EGL or GLX in this file.
*
* This file defines an API to be implemented by both state trackers and state
* tracker managers.
*/
/**
* The supported rendering API of a state tracker.
*/
enum st_api_type {
ST_API_OPENGL,
ST_API_OPENVG,
ST_API_COUNT
};
/**
* The profile of a context.
*/
enum st_profile_type
{
ST_PROFILE_DEFAULT, /**< OpenGL compatibility profile */
ST_PROFILE_OPENGL_CORE, /**< OpenGL 3.2+ core profile */
ST_PROFILE_OPENGL_ES1, /**< OpenGL ES 1.x */
ST_PROFILE_OPENGL_ES2 /**< OpenGL ES 2.0 */
};
/* for profile_mask in st_api */
#define ST_PROFILE_DEFAULT_MASK (1 << ST_PROFILE_DEFAULT)
#define ST_PROFILE_OPENGL_CORE_MASK (1 << ST_PROFILE_OPENGL_CORE)
#define ST_PROFILE_OPENGL_ES1_MASK (1 << ST_PROFILE_OPENGL_ES1)
#define ST_PROFILE_OPENGL_ES2_MASK (1 << ST_PROFILE_OPENGL_ES2)
/**
* Optional API/state tracker features.
*/
enum st_api_feature
{
ST_API_FEATURE_MS_VISUALS /**< support for multisample visuals */
};
/* for feature_mask in st_api */
#define ST_API_FEATURE_MS_VISUALS_MASK (1 << ST_API_FEATURE_MS_VISUALS)
/**
* New context flags for GL 3.0 and beyond.
*
* Profile information (core vs. compatibilty for OpenGL 3.2+) is communicated
* through the \c st_profile_type, not through flags.
*/
#define ST_CONTEXT_FLAG_DEBUG (1 << 0)
#define ST_CONTEXT_FLAG_FORWARD_COMPATIBLE (1 << 1)
#define ST_CONTEXT_FLAG_ROBUST_ACCESS (1 << 2)
/**
* Reasons that context creation might fail.
*/
enum st_context_error {
ST_CONTEXT_SUCCESS = 0,
ST_CONTEXT_ERROR_NO_MEMORY,
ST_CONTEXT_ERROR_BAD_API,
ST_CONTEXT_ERROR_BAD_VERSION,
ST_CONTEXT_ERROR_BAD_FLAG,
ST_CONTEXT_ERROR_UNKNOWN_ATTRIBUTE,
ST_CONTEXT_ERROR_UNKNOWN_FLAG
};
/**
* Used in st_context_iface->teximage.
*/
enum st_texture_type {
ST_TEXTURE_1D,
ST_TEXTURE_2D,
ST_TEXTURE_3D,
ST_TEXTURE_RECT
};
/**
* Available attachments of framebuffer.
*/
enum st_attachment_type {
ST_ATTACHMENT_FRONT_LEFT,
ST_ATTACHMENT_BACK_LEFT,
ST_ATTACHMENT_FRONT_RIGHT,
ST_ATTACHMENT_BACK_RIGHT,
ST_ATTACHMENT_DEPTH_STENCIL,
ST_ATTACHMENT_ACCUM,
ST_ATTACHMENT_SAMPLE,
ST_ATTACHMENT_COUNT,
ST_ATTACHMENT_INVALID = -1
};
/* for buffer_mask in st_visual */
#define ST_ATTACHMENT_FRONT_LEFT_MASK (1 << ST_ATTACHMENT_FRONT_LEFT)
#define ST_ATTACHMENT_BACK_LEFT_MASK (1 << ST_ATTACHMENT_BACK_LEFT)
#define ST_ATTACHMENT_FRONT_RIGHT_MASK (1 << ST_ATTACHMENT_FRONT_RIGHT)
#define ST_ATTACHMENT_BACK_RIGHT_MASK (1 << ST_ATTACHMENT_BACK_RIGHT)
#define ST_ATTACHMENT_DEPTH_STENCIL_MASK (1 << ST_ATTACHMENT_DEPTH_STENCIL)
#define ST_ATTACHMENT_ACCUM_MASK (1 << ST_ATTACHMENT_ACCUM)
#define ST_ATTACHMENT_SAMPLE_MASK (1 << ST_ATTACHMENT_SAMPLE)
/**
* Enumerations of state tracker context resources.
*/
enum st_context_resource_type {
ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_2D,
ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_3D,
ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_X,
ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_X,
ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Y,
ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_POSITIVE_Z,
ST_CONTEXT_RESOURCE_OPENGL_TEXTURE_CUBE_MAP_NEGATIVE_Z,
ST_CONTEXT_RESOURCE_OPENGL_RENDERBUFFER,
ST_CONTEXT_RESOURCE_OPENVG_PARENT_IMAGE
};
/**
* Flush flags.
*/
#define ST_FLUSH_FRONT (1 << 0)
#define ST_FLUSH_END_OF_FRAME (1 << 1)
/**
* Value to st_manager->get_param function.
*/
enum st_manager_param {
/**
* The dri state tracker on old libGL's doesn't do the right thing
* with regards to invalidating the framebuffers.
*
* For the mesa state tracker that means that it needs to invalidate
* the framebuffer in glViewport itself.
*/
ST_MANAGER_BROKEN_INVALIDATE
};
/**
* The return type of st_api->get_proc_address.
*/
typedef void (*st_proc_t)(void);
struct pipe_context;
struct pipe_resource;
struct pipe_fence_handle;
/**
* Used in st_context_iface->get_resource_for_egl_image.
*/
struct st_context_resource
{
/* these fields are filled in by the caller */
enum st_context_resource_type type;
void *resource;
/* this is owned by the caller */
struct pipe_resource *texture;
};
/**
* Used in st_manager_iface->get_egl_image.
*/
struct st_egl_image
{
/* this is owned by the caller */
struct pipe_resource *texture;
unsigned level;
unsigned layer;
};
/**
* Represent the visual of a framebuffer.
*/
struct st_visual
{
/**
* Available buffers. Tested with ST_FRAMEBUFFER_*_MASK.
*/
unsigned buffer_mask;
/**
* Buffer formats. The formats are always set even when the buffer is
* not available.
*/
enum pipe_format color_format;
enum pipe_format depth_stencil_format;
enum pipe_format accum_format;
int samples;
/**
* Desired render buffer.
*/
enum st_attachment_type render_buffer;
};
/**
* Configuration options from driconf
*/
struct st_config_options
{
boolean disable_blend_func_extended;
boolean disable_glsl_line_continuations;
boolean disable_shader_bit_encoding;
boolean force_glsl_extensions_warn;
unsigned force_glsl_version;
boolean force_s3tc_enable;
};
/**
* Represent the attributes of a context.
*/
struct st_context_attribs
{
/**
* The profile and minimal version to support.
*
* The valid profiles and versions are rendering API dependent. The latest
* version satisfying the request should be returned.
*/
enum st_profile_type profile;
int major, minor;
/** Mask of ST_CONTEXT_FLAG_x bits */
unsigned flags;
/**
* The visual of the framebuffers the context will be bound to.
*/
struct st_visual visual;
/**
* Configuration options.
*/
struct st_config_options options;
};
struct st_context_iface;
/**
* Represent a windowing system drawable.
*
* The framebuffer is implemented by the state tracker manager and
* used by the state trackers.
*
* Instead of the winsys poking into the API context to figure
* out what buffers that might be needed in the future by the API
* context, it calls into the framebuffer to get the textures.
*
* This structure along with the notify_invalid_framebuffer
* allows framebuffers to be shared between different threads
* but at the same make the API context free from thread
* synchronization primitves, with the exception of a small
* atomic flag used for notification of framebuffer dirty status.
*
* The thread synchronization is put inside the framebuffer
* and only called once the framebuffer has become dirty.
*/
struct st_framebuffer_iface
{
/**
* Atomic stamp which changes when framebuffers need to be updated.
*/
int32_t stamp;
/**
* Available for the state tracker manager to use.
*/
void *st_manager_private;
/**
* The visual of a framebuffer.
*/
const struct st_visual *visual;
/**
* Flush the front buffer.
*
* On some window systems, changes to the front buffers are not immediately
* visible. They need to be flushed.
*
* @att is one of the front buffer attachments.
*/
boolean (*flush_front)(struct st_context_iface *stctx,
struct st_framebuffer_iface *stfbi,
enum st_attachment_type statt);
/**
* The state tracker asks for the textures it needs.
*
* It should try to only ask for attachments that it currently renders
* to, thus allowing the winsys to delay the allocation of textures not
* needed. For example front buffer attachments are not needed if you
* only do back buffer rendering.
*
* The implementor of this function needs to also ensure
* thread safty as this call might be done from multiple threads.
*
* The returned textures are owned by the caller. They should be
* unreferenced when no longer used. If this function is called multiple
* times with different sets of attachments, those buffers not included in
* the last call might be destroyed. This behavior might change in the
* future.
*/
boolean (*validate)(struct st_context_iface *stctx,
struct st_framebuffer_iface *stfbi,
const enum st_attachment_type *statts,
unsigned count,
struct pipe_resource **out);
};
/**
* Represent a rendering context.
*
* This entity is created from st_api and used by the state tracker manager.
*/
struct st_context_iface
{
/**
* Available for the state tracker and the manager to use.
*/
void *st_context_private;
void *st_manager_private;
/**
* The CSO context associated with this context in case we need to draw
* something before swap buffers.
*/
struct cso_context *cso_context;
/**
* The gallium context.
*/
struct pipe_context *pipe;
/**
* Destroy the context.
*/
void (*destroy)(struct st_context_iface *stctxi);
/**
* Flush all drawing from context to the pipe also flushes the pipe.
*/
void (*flush)(struct st_context_iface *stctxi, unsigned flags,
struct pipe_fence_handle **fence);
/**
* Replace the texture image of a texture object at the specified level.
*
* This function is optional.
*/
boolean (*teximage)(struct st_context_iface *stctxi,
enum st_texture_type target,
int level, enum pipe_format internal_format,
struct pipe_resource *tex, boolean mipmap);
/**
* Used to implement glXCopyContext.
*/
void (*copy)(struct st_context_iface *stctxi,
struct st_context_iface *stsrci, unsigned mask);
/**
* Used to implement wglShareLists.
*/
boolean (*share)(struct st_context_iface *stctxi,
struct st_context_iface *stsrci);
/**
* Look up and return the info of a resource for EGLImage.
*
* This function is optional.
*/
boolean (*get_resource_for_egl_image)(struct st_context_iface *stctxi,
struct st_context_resource *stres);
};
/**
* Represent a state tracker manager.
*
* This interface is implemented by the state tracker manager. It corresponds
* to a "display" in the window system.
*/
struct st_manager
{
struct pipe_screen *screen;
/**
* Look up and return the info of an EGLImage.
*
* This is used to implement for example EGLImageTargetTexture2DOES.
* The GLeglImageOES agrument of that call is passed directly to this
* function call and the information needed to access this is returned
* in the given struct out.
*
* @smapi: manager owning the caller context
* @stctx: caller context
* @egl_image: EGLImage that caller recived
* @out: return struct filled out with access information.
*
* This function is optional.
*/
boolean (*get_egl_image)(struct st_manager *smapi,
void *egl_image,
struct st_egl_image *out);
/**
* Query an manager param.
*/
int (*get_param)(struct st_manager *smapi,
enum st_manager_param param);
};
/**
* Represent a rendering API such as OpenGL or OpenVG.
*
* Implemented by the state tracker and used by the state tracker manager.
*/
struct st_api
{
/**
* The name of the rendering API. This is informative.
*/
const char *name;
/**
* The supported rendering API.
*/
enum st_api_type api;
/**
* The supported profiles. Tested with ST_PROFILE_*_MASK.
*/
unsigned profile_mask;
/**
* The supported optional features. Tested with ST_FEATURE_*_MASK.
*/
unsigned feature_mask;
/**
* Destroy the API.
*/
void (*destroy)(struct st_api *stapi);
/**
* Return an API entry point.
*
* For GL this is the same as _glapi_get_proc_address.
*/
st_proc_t (*get_proc_address)(struct st_api *stapi, const char *procname);
/**
* Create a rendering context.
*/
struct st_context_iface *(*create_context)(struct st_api *stapi,
struct st_manager *smapi,
const struct st_context_attribs *attribs,
enum st_context_error *error,
struct st_context_iface *stsharei);
/**
* Bind the context to the calling thread with draw and read as drawables.
*
* The framebuffers might be NULL, or might have different visuals than the
* context does.
*/
boolean (*make_current)(struct st_api *stapi,
struct st_context_iface *stctxi,
struct st_framebuffer_iface *stdrawi,
struct st_framebuffer_iface *streadi);
/**
* Get the currently bound context in the calling thread.
*/
struct st_context_iface *(*get_current)(struct st_api *stapi);
};
/**
* Return true if the visual has the specified buffers.
*/
static INLINE boolean
st_visual_have_buffers(const struct st_visual *visual, unsigned mask)
{
return ((visual->buffer_mask & mask) == mask);
}
#endif /* _ST_API_H_ */