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// MobileGL - MobileGL/MG_Backend/DirectGLES/DirectGLES.h
// Copyright (c) 2025-2026 MobileGL-Dev
// Licensed under the GNU Lesser General Public License v3.0:
// https://www.gnu.org/licenses/gpl-3.0.txt
// https://www.gnu.org/licenses/lgpl-3.0.txt
// SPDX-License-Identifier: LGPL-3.0-only
// End of Source File Header
#pragma once
#include <Includes.h>
#include <MG_Backend/BackendObject.h>
#include <MG_State/GLState/FramebufferState/FramebufferObject.h>
#include <MG_State/GLState/TextureState/TextureState.h>
#include <MG_State/GLState/SamplerState/SamplerObject.h>
#include <MG_Util/BackendLoaders/OpenGL/Loader.h>
#define CallAndCheck(operation) \
MGLOG_D("Call GLES func: %s", #operation); \
operation Utils::CheckGLESError();
namespace MobileGL::MG_Backend::DirectGLES {
// Re-establishes the frontend texture-unit bindings on the native ES context.
// Content uploads use scratch bindings, so draws and dispatches call this after
// texture synchronization.
void BindCurrentTextures();
// Driver-side color/depth level readback. Returns tightly packed, owned
// bytes in the requested pair; never consults a frontend texture or PACK/PBO.
// The caller supplies identity and extent, and whether the SOURCE allocation
// already uses an image carrier.
Bool ReadTextureLevelTight(GLuint texture, TextureTarget target, TextureUploadTarget uploadTarget,
TextureInternalFormat logicalFormat, GLint level, const IntVec3& logicalExtent,
Bool sourceUsesImageCarrier, GLenum format, GLenum type, Vector<Uint8>& bytes);
Bool ReadTextureImageWire(const MG_Pipe::MGPReadbackInfo& info, Vector<Uint8>& bytes);
// Whether the NATIVE texture currently holds `level` of `uploadTarget` at `logicalExtent`
// (glGetTexLevelParameteriv). False for a level the driver never allocated - one defined after
// the texture's last sync - so a re-mint does not read what is not there. A query the driver
// refuses answers true, keeping the caller on its readback path.
Bool NativeTextureLevelHasExtent(GLuint texture, TextureTarget target, TextureUploadTarget uploadTarget,
GLint level, const IntVec3& logicalExtent);
void ClearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
void ClearBufferfv(GLenum buffer, GLint drawbuffer, const GLfloat* value);
void ClearBufferuiv(GLenum buffer, GLint drawbuffer, const GLuint* value);
void ClearBufferiv(GLenum buffer, GLint drawbuffer, const GLint* value);
void Clear(GLbitfield mask);
void DrawElements(GLenum mode, GLsizei count, GLenum type, const void* indices);
void DrawArrays(GLenum mode, GLint first, GLsizei count);
void DrawElementsBaseVertex(GLenum mode, GLsizei count, GLenum type, const GLvoid* indices, GLint basevertex);
void MultiDrawArrays(GLenum mode, const GLint* first, const GLsizei* count, GLsizei drawcount);
void MultiDrawElementsBaseVertex(GLenum mode, const GLsizei* count, GLenum type, const GLvoid* const* indices,
GLsizei drawcount, const GLint* basevertex);
void MultiDrawElementsIndirect(GLenum mode, GLenum type, const void* indirect, GLsizei drawcount, GLsizei stride);
void MultiDrawElementsIndirectCount(GLenum mode, GLenum type, const void* indirect, GLintptr drawcount,
GLsizei maxdrawcount, GLsizei stride);
void MultiDrawArraysIndirect(GLenum mode, const void* indirect, GLsizei drawcount, GLsizei stride);
void MultiDrawArraysIndirectCount(GLenum mode, const void* indirect, GLintptr drawcount, GLsizei maxdrawcount,
GLsizei stride);
void DrawRangeElementsBaseVertex(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type,
const void* indices, GLint basevertex);
void DrawRangeElements(GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, const void* indices);
void DrawElementsInstancedBaseVertexBaseInstance(GLenum mode, GLsizei count, GLenum type, const void* indices,
GLsizei instancecount, GLint basevertex, GLuint baseinstance);
void DrawElementsInstancedBaseVertex(GLenum mode, GLsizei count, GLenum type, const void* indices,
GLsizei instancecount, GLint basevertex);
void DrawElementsInstancedBaseInstance(GLenum mode, GLsizei count, GLenum type, const void* indices,
GLsizei instancecount, GLuint baseinstance);
void DrawElementsInstanced(GLenum mode, GLsizei count, GLenum type, const void* indices, GLsizei instancecount);
void DrawElementsIndirect(GLenum mode, GLenum type, const void* indirect);
void DrawArraysInstancedBaseInstance(GLenum mode, GLint first, GLsizei count, GLsizei instancecount,
GLuint baseinstance);
void DrawArraysInstanced(GLenum mode, GLint first, GLsizei count, GLsizei instancecount);
void DrawArraysIndirect(GLenum mode, const void* indirect);
void BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1,
GLint dstY1, GLbitfield mask, GLenum filter);
void CopyTexImage2D(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width,
GLsizei height, GLint border);
void CopyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width,
GLsizei height);
void CopyImageSubData(const CopyImageEndpoint& src, GLenum srcTarget, GLint srcLevel, GLint srcX, GLint srcY,
GLint srcZ, const CopyImageEndpoint& dst, GLenum dstTarget, GLint dstLevel, GLint dstX,
GLint dstY, GLint dstZ, GLsizei srcWidth, GLsizei srcHeight, GLsizei srcDepth);
void GenerateMipmap(GLenum target);
const GLubyte* GetString(GLenum name);
void ReadPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, void* pixels);
void DispatchCompute(GLuint numGroupsX, GLuint numGroupsY, GLuint numGroupsZ);
void DispatchComputeIndirect(GLintptr indirect);
void MemoryBarrier(GLbitfield barriers);
void MemoryBarrierByRegion(GLbitfield barriers);
void BindImageTexture(GLuint unit, GLuint texture, GLint level, GLboolean layered, GLint layer, GLenum access,
GLenum format);
void GetIntegeri_v(GLenum target, GLuint index, GLint* data);
void ShaderStorageBlockBinding(GLuint program, const GLchar* storageBlockName, GLuint storageBlockBinding);
Bool InitWindowSurface(NativeWindowType window);
Bool InitPbufferSurface(EGLint width, EGLint height);
// The calling thread's session's current native draw surface (the one the last Init*Surface
// created, or the last BindSessionSurface named).
EGLSurface CurrentSessionDrawSurface();
// The surface the calling thread's ACTIVE context last drew to (EGL_NO_SURFACE for none).
EGLSurface CurrentContextDrawSurface();
// EGL_BUFFER_AGE_EXT of the session's current draw surface for the next frame: the driver's
// answer for a window surface, 1 for a pbuffer that has been presented (a pbuffer's content stays
// across swaps), 0 otherwise. A driver whose buffer age is only EGL_KHR_partial_update's keeps
// nothing inside the frame's damage region - the whole surface unless one is set - so it is asked
// only when `damageRegionFollows` (SetCurrentDrawDamageRegion before the first draw).
Int32 CurrentDrawBufferAge(Bool damageRegionFollows);
// eglSetDamageRegionKHR(region) on the session's current window surface (a pbuffer, or a driver
// without EGL_KHR_partial_update, ignores it). The driver wants the age asked first in the frame;
// when the client was answered without asking it, it is asked here.
Bool SetCurrentDrawDamageRegion(const MG_Util::Damage::Region& region);
// Makes an EXISTING native surface of the calling thread's session the one it draws to, and
// binds it to the active context. False for a surface the session does not own.
Bool BindSessionSurface(EGLSurface surface);
// The same selection without the bind (the caller binds - MakeCurrent - unconditionally).
Bool SelectSessionSurface(EGLSurface surface);
// Destroys one native surface of the calling thread's session - and only it; the session's
// contexts and other surfaces are untouched.
void DestroySessionSurface(EGLSurface surface);
// A new pbuffer of the calling thread's session, created with the active context's config and
// bound to nothing (EGL: creating a surface changes no binding).
EGLSurface CreateSessionPbuffer(EGLint width, EGLint height);
// Every context of the session that drew to `previous` draws to `replacement` instead, and
// `previous` is destroyed (a pbuffer-backed window's resize).
void ReplaceSessionSurface(EGLSurface previous, EGLSurface replacement);
// The server window going away (screen off): every context of the session that drew to the
// window surface `windowSurface` draws to a new 1x1 placeholder pbuffer instead, and the window
// surface is destroyed - no longer current anywhere once this returns. The contexts and their
// objects stay. Returns the placeholder, or EGL_NO_SURFACE (nothing changed) when none could be
// made.
EGLSurface SuspendSessionWindowSurface(EGLSurface windowSurface);
// The way back: a window surface on `window` replaces `placeholder` (EGL_NO_SURFACE: none to
// replace) for every context that drew to it, is bound, and its extent is published as a
// creation publishes it. Returns the new surface, or EGL_NO_SURFACE.
EGLSurface ResumeSessionWindowSurface(EGLSurface placeholder, NativeWindowType window);
// The window under `surface` changed size: its extent (the display's) is published again, at once.
Bool RepublishWindowSurfaceShape(EGLSurface surface, NativeWindowType window);
Bool MakeCurrent();
Bool ReleaseCurrent();
// True when the backend ES context is current on the calling thread, i.e.
// immediate buffer ops may issue GL calls right now.
Bool IsBackendContextCurrentOnThisThread();
#if MOBILEGL_BUILD_DISAGGREGATED
// DEVICE LOSS, Espryt's half (Magma's is VulkanRenderer::LatchWireDeviceLoss). Asks the
// driver whether the calling thread's context was reset (glGetGraphicsResetStatus); a reset -
// or the debug knob MGPipeDebugDeviceLossDue - latches THIS session through
// MGPipeSessionLatch and answers true, and the caller returns from its verb without issuing
// more GL. Asked at the frame boundaries (Present, a shared-image present), before a readback,
// and by the apply loop each time it wakes (LatchIfGpuFaulted), never per draw. The contexts ask
// for reset notification (NativeContextsNotifyResets) so the driver can name the GUILTY one;
// only GUILTY (or a reset of unknown cause) ends the session - an INNOCENT report, a context
// whose work merely waited behind another's hang (the compositor's among them), is only noted.
// `debugKnob` false: the knob is not consulted here (the on-screen Present, so an injected loss
// lands on an offscreen client's shared-image present or readback, never on the compositor's).
Bool LatchIfDeviceLost(const char* site, Bool debugKnob = true);
// The apply loop's form of it (ServerHooks::LatchIfGpuFaulted), asked each time the apply thread
// wakes: the driver's report only, no debug knob, and no EGL ground-truth verification spent.
Bool LatchIfGuiltyBeforeApply();
#endif
// True once the process's native contexts were created with EGL_LOSE_CONTEXT_ON_RESET (decided
// by the first one; the driver must offer EGL_EXT_create_context_robustness).
Bool NativeContextsNotifyResets();
// GL fence sync objects, backed by native ES fences. FenceSync returns null
// (the frontend then falls back to an always-signaled sync) when the calling
// thread does not own the ES context. Waits/queries degrade to "signaled" in
// the same situation, and handles created under a since-destroyed ES context
// are always treated as signaled.
BackendSyncHandle FenceSync();
GLenum ClientWaitSync(BackendSyncHandle sync, GLbitfield flags, GLuint64 timeout);
void WaitSync(BackendSyncHandle sync, GLbitfield flags, GLuint64 timeout);
void DeleteSync(BackendSyncHandle sync);
Bool GetSyncStatus(BackendSyncHandle sync);
// True when GL_EXT_disjoint_timer_query and every entry point the timer
// hooks below need are present. Also gates the E_GL_ARB_timer_query
// advertisement in BackendObject_DirectGLES::InitCapabilities, and is
// registered as the GLFunctionsTable::IsTimerQuerySupported hook: a pure
// capability read needs no current ES context, and it stays false until
// the ES capabilities have been filled in.
Bool AreTimerQueriesSupported();
// True when the host ES driver can back a GL_TEXTURE_BUFFER at all - ES 3.2 core, or
// EXT/OES_texture_buffer, with glTexBuffer resolved. Desktop GL has had buffer textures as
// core since 3.1, so the frontend advertises them unconditionally and an app may call
// glTexBuffer whenever it likes; this is the only thing standing between that call and a
// null entry point. False also means every shader declaring a samplerBuffer is
// uncompilable on this driver, which the program build reports by name.
Bool AreBufferTexturesSupported();
// Human-readable name of the buffer-texture tier for diagnostics and the driver POST:
// "core (ES 3.2)", "GL_EXT_texture_buffer", "GL_OES_texture_buffer" or "unsupported".
const char* GetBufferTextureTierName();
// glTexBuffer / glTexBufferRange through whichever spelling this driver's buffer-texture
// support actually ships: the unsuffixed names are ES 3.2 core, while an EXT/OES driver
// exports glTexBuffer{,Range}EXT / OES. Callers must have checked
// AreBufferTexturesSupported() first. CallTexBufferRange reports whether it could honor
// the range - no tier is required to expose the range form, and the whole-buffer form is
// the documented fallback.
void CallTexBuffer(GLenum target, GLenum internalFormat, GLuint buffer);
Bool CallTexBufferRange(GLenum target, GLenum internalFormat, GLuint buffer, GLintptr offset, GLsizeiptr size);
// GL timer-query objects, backed by GL_EXT_disjoint_timer_query. The
// creators return null (the frontend then falls back to an immediately
// available zero result) when the calling thread does not own the ES
// context or the extension/entry points are missing, and handles created
// under a since-destroyed ES context are always treated as complete with
// a zero result (mirrors the fence-sync handles above).
BackendQueryHandle BeginTimeElapsedQuery();
void EndTimeElapsedQuery(BackendQueryHandle query);
BackendQueryHandle QueryCounterTimestamp();
// GL_ANY_SAMPLES_PASSED(_CONSERVATIVE) occlusion queries: core ES3, independent of
// GL_EXT_disjoint_timer_query and of MOBILEGL_DISABLE_TIMERQUERY. Results/deletion
// flow through GetQueryResult64/DeleteBackendQuery like the timer queries above.
BackendQueryHandle BeginOcclusionQuery();
void EndOcclusionQuery(BackendQueryHandle query);
// GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN / GL_PRIMITIVES_GENERATED, also core ES
// (GL_PRIMITIVES_GENERATED from ES 3.2 on). Null when the target is unavailable, in
// which case the frontend falls back to counting primitives from the draw calls.
BackendQueryHandle BeginXfbPrimitivesQuery(Bool generated);
void EndXfbPrimitivesQuery(BackendQueryHandle query);
Bool IsQueryResultAvailable(BackendQueryHandle query);
// Returns true when a final value landed in *outNanoseconds (a zero for
// null or stale-generation handles IS final: the frontend may cache it
// and release the handle). Returns false only when the calling thread
// does not own the ES context, so the value is genuinely unobtainable
// right now; the handle stays alive and readable later.
Bool GetQueryResult64(BackendQueryHandle query, Bool wait, Uint64* outNanoseconds);
void DeleteBackendQuery(BackendQueryHandle query);
Int64 GetGpuTimestampNs();
void Present();
// Frame-completion watermarks for the buffer-storage pool: CurrentFrameSerial()
// is bumped once per Present(); CompletedFrameSerial() is the newest frame whose
// GPU work has provably finished (advanced by polling a one-fence-per-frame ring).
// A buffer retired during frame N is safe to recycle once CompletedFrameSerial() >= N.
Uint64 CurrentFrameSerial();
Uint64 CompletedFrameSerial();
// Block (up to timeoutNs) until the given frame serial provably retired on the
// GPU, using the per-frame fence ring. False when no usable fence covers the
// serial (fence-less context, foreign thread, or the slot was recycled);
// completion state is untouched in that case.
Bool WaitForFrameSerialCompleted(Uint64 serial, Uint64 timeoutNs);
// Applies (or defers until the window surface exists) the app-requested
// eglSwapInterval on the native EGL surface.
void SetSwapInterval(Int interval);
#if MOBILEGL_BUILD_DISAGGREGATED
// P12 review fix: the swap interval an ended server session asked for is not the next one's.
// The request outlives the context on purpose (a surface re-created mid-session re-applies it),
// so the in-process display server's session end forgets it: the next session starts at the
// driver's default until it asks (BackendObject_DirectGLES's destructor under a transport).
void ForgetRequestedSwapInterval();
#endif
void SetEGLFuncsTable(const MG_External::EGLFunctionsTable& eglFuncs);
void SetGLESFuncsTable(const MG_External::GLESFunctionsTable& glesFuncs);
void SetGLESCapabilities(const MG_External::GLESCapabilities& capabilities);
// ---------------------------------------------------------------------------------
// P14 S4 (docs/Disaggregated/design/11-state-ownership.md): THE NATIVE TUPLE IS PER CONTEXT
// ---------------------------------------------------------------------------------
//
// The display is process state and stays one object (eglInitialize once per process, terminated
// when the last native context leaves). The native EGLContext, the config it was created with
// and the native surfaces are keyed by (session, client context token) - the identity S1 put on
// the wire and S2 gave a per-thread owner. Creating a second context therefore no longer tears
// the first one's native context down, which is what lets two contexts (and two share groups)
// be live at once in one process.
// Answers, for the CALLING THREAD, which session it belongs to and which client context token
// that session has bound. Installed once by the server layer; with no resolver installed -
// monolith, a frontend-only process, a unit case - the answer is the single key {0, 0}, which is
// exactly the process singleton this replaces. `false` also means {0,0}.
using NativeContextKeyResolver = Bool (*)(Uint64* outSessionKey, Uint64* outContextToken);
void SetNativeContextKeyResolver(NativeContextKeyResolver resolver);
// ---------------------------------------------------------------------------------
// P14 S6 (docs/Disaggregated/design/11-state-ownership.md): THE TWIN TABLES' KEY, AND ITS
// SHAPE IS S4's, ONE LEVEL DOWN. A twin is a DRIVER object, so it lives in one native
// context's object namespace; the identity a twin table must be keyed on is therefore
// {session, share group} - the SAME two words the applier's OBJECT RECORDS are filed under
// (PipeApply.h's MGPipeApplierKey, derived by the same probe and the same `0 means its own
// group` rule, so the two agree by construction rather than by two conventions).
//
// Answers, for the CALLING THREAD, which session it belongs to and which share group that
// session's current context is in. Installed once by the server layer beside the native and
// applier probes; with no probe installed - or on a thread that is no session's own, which
// is the client process, the in-process client+server shape and every unit case - the
// answer is the single key {0, 0}, exactly the process-wide table this replaces.
struct TwinKey {
Uint64 SessionKey = 0;
Uint64 ShareGroupKey = 0;
Bool operator==(const TwinKey& other) const {
return SessionKey == other.SessionKey && ShareGroupKey == other.ShareGroupKey;
}
Bool operator!=(const TwinKey& other) const { return !(*this == other); }
};
struct TwinKeyHash {
SizeT operator()(const TwinKey& key) const {
// The 64-bit mix SlotAllocator and the applier's registry already use for their own
// pair keys, so every keyed table in this tree hashes a session the same way.
Uint64 mixed = key.SessionKey ^
(key.ShareGroupKey + 0x9E3779B97F4A7C15ull + (key.SessionKey << 6) + (key.SessionKey >> 2));
mixed ^= mixed >> 33;
mixed *= 0xFF51AFD7ED558CCDull;
mixed ^= mixed >> 33;
return static_cast<SizeT>(mixed);
}
};
using TwinKeyResolver = Bool (*)(TwinKey* outKey);
void SetTwinKeyResolver(TwinKeyResolver resolver);
// The calling thread's key. Answers false for {0, 0} - the process-wide group - which is
// also the answer when no probe has ever been installed.
Bool CurrentTwinKey(TwinKey* outKey);
// Builds the native context for `contextToken` under the calling thread's session. A
// `shareGroupToken` whose group already has a live native context in this session hands that
// context to eglCreateContext as the share argument - which is what makes two contexts see one
// set of buffer/texture objects. Idempotent: a token that already has one answers true.
Bool CreateNativeContextFor(Uint64 contextToken, Uint64 shareGroupToken);
// Destroys ONE context's native tuple (the DestroyContext control frame). The session's other
// contexts are untouched; the display is terminated only when the last context in the process
// has gone.
void DestroyNativeContextFor(Uint64 contextToken);
// ---- objects that belong to ONE native context ----
//
// Framebuffers, vertex arrays, transform feedbacks and queries are container objects: GL never
// shares them, not even between contexts of one share group, and every context numbers its own
// from 1. A process-wide scratch FBO id minted in one context and bound in another therefore
// names THAT context's own framebuffer - often an application's - and the scratch path's
// attach/scrub then rewires it onto staging textures. With one process serving several
// sessions (each with its own native contexts) that silently corrupted other clients' frames.
//
// The calling thread's current native context as a lifetime serial: assigned when the context
// is created and never reused (a recycled EGLContext address is a new serial). 0 when none was
// made current through MakeCurrent.
//
// P15: it lives in one constant-initialized thread_local with the PerNativeContext lookup
// cache below, so the draw path's "this context's entry" question is one TLS address
// computation, not two calls each paying their own.
struct NativeContextThreadState {
struct CacheEntry {
const void* Owner = nullptr;
Uint64 Serial = 0;
Uint64 Epoch = 0;
void* Entry = nullptr;
};
static constexpr Uint32 kCacheEntries = 8;
Uint64 BoundSerial = 0;
// One entry per PerNativeContext instance slot (instances sharing a slot evict each other).
CacheEntry Cache[kCacheEntries]{};
};
inline constinit thread_local NativeContextThreadState t_nativeContextThread;
inline Uint64 CurrentNativeContextSerial() {
return t_nativeContextThread.BoundSerial;
}
class PerNativeContextBase {
public:
PerNativeContextBase();
PerNativeContextBase(const PerNativeContextBase&) = delete;
PerNativeContextBase& operator=(const PerNativeContextBase&) = delete;
// The context died, and its names with it: forget them (no GL call - there is no context
// left to make one in).
virtual void ForgetContext(Uint64 serial) = 0;
protected:
~PerNativeContextBase();
// This instance's entry in NativeContextThreadState::Cache.
const Uint32 m_cacheSlot;
};
// Called where a native context is destroyed.
void ForgetNativeContextObjects(Uint64 serial);
// Moves whenever any per-context entry is dropped; a thread's cached entry is valid while
// it has not moved.
Uint64 PerNativeContextEpoch();
void BumpPerNativeContextEpoch();
// One T per native context, created on first use from that context.
template <typename T>
class PerNativeContext final : public PerNativeContextBase {
public:
T& Current() {
NativeContextThreadState& thread = t_nativeContextThread;
const Uint64 serial = thread.BoundSerial;
// The draw path asks for the same entry over and over from one thread: a one-entry
// thread-local cache per instance, invalidated by any drop anywhere (rare) and by an
// instance's destruction (so a later instance at the same address cannot hit).
NativeContextThreadState::CacheEntry& cache = thread.Cache[m_cacheSlot];
const Uint64 epoch = PerNativeContextEpoch();
if (cache.Owner == this && cache.Serial == serial && cache.Epoch == epoch) {
return *static_cast<T*>(cache.Entry);
}
const std::lock_guard<std::mutex> lock(m_mutex);
T& entry = m_bySerial[serial]; // node-based: the reference survives other contexts' inserts
cache = {this, serial, epoch, &entry};
return entry;
}
template <typename F>
void ForEach(F&& visit) {
const std::lock_guard<std::mutex> lock(m_mutex);
for (auto& entry : m_bySerial)
visit(entry.second);
}
void Clear() {
const std::lock_guard<std::mutex> lock(m_mutex);
BumpPerNativeContextEpoch();
m_bySerial.clear();
}
void ForgetContext(Uint64 serial) override {
const std::lock_guard<std::mutex> lock(m_mutex);
BumpPerNativeContextEpoch();
m_bySerial.erase(serial);
}
private:
std::mutex m_mutex;
std::unordered_map<Uint64, T> m_bySerial;
};
// The GL name of one per-context object, spelled like the plain `GLuint` it replaces: it reads
// as the CURRENT context's name, `= 0` resets that one, and `&name` is where glGen* writes it.
class NativeContextName {
public:
operator GLuint() const { return m_names.Current(); }
NativeContextName& operator=(GLuint name) {
m_names.Current() = name;
return *this;
}
GLuint* operator&() { return &m_names.Current(); }
private:
mutable PerNativeContext<GLuint> m_names;
};
// P14 S4. THE NATIVE HALF OF A CONTEXT SWITCH. `bind_context` moves which context the session's
// records belong to; this makes the calling thread's native tuple follow it, binding the
// session's current surface to the newly named context's native EGLContext. A no-op when the
// named context has no native context yet (the session never sent CreateContext) or when the
// native context already current on this thread IS that one - so the single-context world pays
// nothing for it. Called from the bind_context path on the apply thread.
Bool MakeNativeContextCurrentForBoundToken();
// P14: the server's backend turn moved to the calling apply thread (ServerLoop.cpp's
// BackendTurnLock). Takes the backend's GL ownership for this thread and drops every
// binding shadow, which still describes the previous holder's native context.
void OnBackendTurnHandoff();
// How many native contexts this process holds, and how many of them belong to one session. The
// test observables for "a second context did not tear the first one down".
Uint64 NativeContextCount();
Uint64 NativeContextCountForSession(Uint64 sessionKey);
// The calling thread's session, as the resolver above reports it (0 with no resolver).
Uint64 CurrentNativeSessionKey();
// ---- Test observables (P14 S4). EGL exposes no "which EGLContext does this client context
// hold" query and no way to ask a context for its share group, so a case that must tell "the
// same native context still serves" from "a fresh one was built", or a sharing pair from two
// unrelated contexts, reads it here. These are pure reads plus one key override; neither is on
// a production path and neither changes behavior.
EGLContext NativeContextHandleFor(Uint64 sessionKey, Uint64 contextToken);
// Overrides the key the calling thread resolves to, for the life of the call. The backend's
// ordinary answer comes from the server layer's probe; this is how a case drives exactly the
// tuple it means when no session runtime is installed.
void ForceNativeContextKeyForTesting(Uint64 sessionKey, Uint64 contextToken);
void DestroyEGLContext();
// Transform feedback capture spans, performed by the real ES driver. The
// capture set is declared on the backend program at link time; the driver-side
// begin is deferred to the first draw of the span (ES needs the capturing
// program current and the capture buffers bound), and the end also mirrors the
// captured bytes back into the frontend buffer shadows.
void PatchParameteri(GLenum pname, GLint value);
namespace XfbImpl {
Bool AreTransformFeedbacksSupported();
// True while a capture span is open on the current transform feedback object
// (frontend Begin seen and not paused), whether or not the deferred driver-side
// Begin has been issued yet. Draw paths that would restructure the primitive
// stream, or that need to dispatch compute mid-draw, decline while it is set.
Bool IsCaptureSpanOpen();
void BeginTransformFeedback(GLenum primitiveMode);
void EndTransformFeedback();
void PauseTransformFeedback();
void ResumeTransformFeedback();
void BindTransformFeedback(GLuint name);
void DeleteTransformFeedback(GLuint name);
void OnBackendContextDestroyed();
} // namespace XfbImpl
namespace RenderStateImpl {
// Pushes the frontend's render-state block to the ES driver, diffed against what was
// last pushed.
//
// `forColorClear` names the CALLER, and the only thing it changes is the color write
// mask handed to the driver. A draw into a color attachment the backend widened from
// three channels to four gets that buffer's alpha channel masked OFF, so nothing can
// move the stored alpha away from the 1.0 the application's three-channel format
// implies (see FramebufferImpl::g_alphaWidenedDrawBufferMask). A CLEAR is how that 1.0
// gets there in the first place, so it must be allowed to write alpha - hence the flag
// rather than an unconditional doctoring. It is part of the sync memo, so a clear
// followed by a draw re-pushes the mask instead of early-outing on an unchanged
// frontend version.
//
// The application's own color mask is never modified: glGet(GL_COLOR_WRITEMASK)
// answers from the frontend state, which this function only reads.
void SyncRenderState(Bool forColorClear = false);
void InvalidateSyncedRenderState();
// GL_SCISSOR_TEST as the driver has it in the native context current on this thread -
// what a guard that turns the test off around its own blit, and puts it back, needs to
// know. The shadow answers only while it describes this context (synced since the last
// invalidation, in this context epoch); otherwise the driver is asked. The shadow is one
// per process: once another session's context synced into it, or a context switch
// invalidated it, its bits are some other context's.
Bool DriverScissorTestEnabled();
// TESTING: the shadow as SyncRenderState leaves it in the current context epoch, with
// GL_SCISSOR_TEST `enabled`.
void SetSyncedScissorTestForTesting(Bool enabled);
// TESTING: `inside` runs within the guard the shared-image present and the readbacks
// copy under (ScopedScissorDisable).
void RunScissorDisabledForTesting(void (*inside)(void*), void* data);
} // namespace RenderStateImpl
#if MOBILEGL_BUILD_DISAGGREGATED
// ---- SHARED IMAGES ----
//
// A shared image reaches the driver only through the Android import path: its AHardwareBuffer
// becomes an EGLImage (EGL_ANDROID_get_native_client_buffer + EGL_ANDROID_image_native_buffer)
// and that EGLImage the storage of a texture or renderbuffer (GL_OES_EGL_image). On a host
// build there is no such path and every entry below declines.
namespace SharedImageImpl {
// One EGLImage over one shared image, holding the image's registry reference for as long
// as the EGLImage lives (SharedImageRegistry.h's lifetime rule). The last reference
// destroys the EGLImage, unless the display that made it has been terminated since (which
// destroyed it already). Opaque outside DirectGLES.cpp.
struct EglImage;
using EglImageRef = SharedPtr<EglImage>;
// An EGLImage for the live shared image `id`, or null with `why`. Needs a current context
// (the first call resolves the extension entry points).
EglImageRef CreateEglImage(Uint64 id, String& why);
// glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image) on what the active unit has bound to
// GL_TEXTURE_2D. False when the driver refused it (its GL error is consumed).
Bool TargetBoundTexture2D(const EglImageRef& image);
// ServerHooks::BlitDefaultFramebufferToSharedImage, for the calling thread's context.
Bool BlitDefaultFramebufferTo(const SharedImageView& image, const MG_Util::Damage::Region& region);
// THE READER'S HALF of the image's sync state (SharedImageRegistry.h). Called on every use
// of a name whose level 0 is `image`, before the command that samples it: when a write
// landed since this context last waited, the context's later commands wait for its fence
// on the GPU; and the image is noted as read by the calling session's current frame.
void AcquireForSampling(const EglImageRef& image);
// YUV IMAGES (NV12/P010, MG_Remote/Server/SharedImageYuv.h) are never a name's level 0: the
// name keeps its own RGBA8 storage `target` (width x height), into which the image is
// converted at its first use in each of the calling session's frames - the image bound as
// an external texture, one triangle drawn - after the registry's CPU copy for a foreign
// buffer. Every touched binding is put back. Called after AcquireForSampling.
Bool IsYuv(const EglImageRef& image);
void ConvertYuvForSampling(const EglImageRef& image, GLuint target, Uint32 width, Uint32 height);
// The calling session's frame boundary for what it has read: hands a fence for everything
// the current context has submitted to every image noted since the last boundary. Called
// at Present and wherever the current native context stops being current (its reads can
// only be fenced from it). Nothing noted = nothing done.
void PublishPendingReads();
// IMPLICIT SYNC BY FLUSH (ServerHooks::PublishSharedImageAccesses): everything the
// calling session used since its last boundary is published as written and read by one
// fence, and the session's first use of an image in each frame from now on also waits for
// the image's pending reads.
Bool PublishPendingAccesses();
// EGL_ANDROID_native_fence_sync's fence command (ServerHooks::ExportNativeFence): a
// sync_file of everything the current context submitted in `*fence` (-1: none, and the work
// is waited out here), and - for a session that writes images - the boundary
// PublishPendingAccesses makes.
Bool ExportNativeFence(int* fence);
} // namespace SharedImageImpl
#endif
extern MG_External::EGLFunctionsTable g_EGLFuncs;
extern MG_External::GLESFunctionsTable g_GLESFuncs;
extern MG_External::GLESCapabilities g_GLESCapabilities;
} // namespace MobileGL::MG_Backend::DirectGLES
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