gecko-dev/dom/canvas/WebGL2ContextQueries.cpp

356 строки
11 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WebGL2Context.h"
#include "GLContext.h"
#include "WebGLQuery.h"
using namespace mozilla;
using namespace mozilla::dom;
/*
* We fake ANY_SAMPLES_PASSED and ANY_SAMPLES_PASSED_CONSERVATIVE with
* SAMPLES_PASSED on desktop.
*
* OpenGL ES 3.0 spec 4.1.6:
* If the target of the query is ANY_SAMPLES_PASSED_CONSERVATIVE, an
* implementation may choose to use a less precise version of the test which
* can additionally set the samples-boolean state to TRUE in some other
* implementation-dependent cases.
*/
static const char*
GetQueryTargetEnumString(GLenum target)
{
switch (target)
{
case LOCAL_GL_ANY_SAMPLES_PASSED:
return "ANY_SAMPLES_PASSED";
case LOCAL_GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
return "ANY_SAMPLES_PASSED_CONSERVATIVE";
case LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
return "TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN";
default:
break;
}
MOZ_ASSERT(false, "Unknown query `target`.");
return "UNKNOWN_QUERY_TARGET";
}
static inline GLenum
SimulateOcclusionQueryTarget(const gl::GLContext* gl, GLenum target)
{
MOZ_ASSERT(target == LOCAL_GL_ANY_SAMPLES_PASSED ||
target == LOCAL_GL_ANY_SAMPLES_PASSED_CONSERVATIVE,
"unknown occlusion query target");
if (gl->IsSupported(gl::GLFeature::occlusion_query_boolean)) {
return target;
} else if (gl->IsSupported(gl::GLFeature::occlusion_query2)) {
return LOCAL_GL_ANY_SAMPLES_PASSED;
}
return LOCAL_GL_SAMPLES_PASSED;
}
WebGLRefPtr<WebGLQuery>*
WebGLContext::GetQueryTargetSlot(GLenum target)
{
switch (target) {
case LOCAL_GL_ANY_SAMPLES_PASSED:
case LOCAL_GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
return &mActiveOcclusionQuery;
case LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
return &mActiveTransformFeedbackQuery;
}
return nullptr;
}
// -------------------------------------------------------------------------
// Query Objects
already_AddRefed<WebGLQuery>
WebGL2Context::CreateQuery()
{
if (IsContextLost())
return nullptr;
if (mActiveOcclusionQuery && !gl->IsGLES()) {
/* http://www.opengl.org/registry/specs/ARB/occlusion_query.txt
*
* Calling either GenQueriesARB or DeleteQueriesARB while any query of
* any target is active causes an INVALID_OPERATION error to be
* generated.
*/
GenerateWarning("createQuery: The WebGL 2 prototype might generate"
" INVALID_OPERATION when creating a query object while"
" one other is active.");
/*
* We *need* to lock webgl2 to GL>=3.0 on desktop, but we don't have a
* good mechanism to do this yet. See bug 898404.
*/
}
nsRefPtr<WebGLQuery> globj = new WebGLQuery(this);
return globj.forget();
}
void
WebGL2Context::DeleteQuery(WebGLQuery* query)
{
if (IsContextLost())
return;
if (!query)
return;
if (query->IsDeleted())
return;
if (query->IsActive())
EndQuery(query->mType);
if (mActiveOcclusionQuery && !gl->IsGLES()) {
/* http://www.opengl.org/registry/specs/ARB/occlusion_query.txt
*
* Calling either GenQueriesARB or DeleteQueriesARB while any query of
* any target is active causes an INVALID_OPERATION error to be
* generated.
*/
GenerateWarning("deleteQuery: The WebGL 2 prototype might generate"
" INVALID_OPERATION when deleting a query object while"
" one other is active.");
}
query->RequestDelete();
}
bool
WebGL2Context::IsQuery(WebGLQuery* query)
{
if (IsContextLost())
return false;
if (!query)
return false;
return (ValidateObjectAllowDeleted("isQuery", query) &&
!query->IsDeleted() &&
query->HasEverBeenActive());
}
void
WebGL2Context::BeginQuery(GLenum target, WebGLQuery* query)
{
if (IsContextLost())
return;
WebGLRefPtr<WebGLQuery>* targetSlot = GetQueryTargetSlot(target);
if (!targetSlot) {
ErrorInvalidEnum("beginQuery: unknown query target");
return;
}
if (!query) {
/* From GLES's EXT_occlusion_query_boolean:
* BeginQueryEXT sets the active query object name for the query
* type given by <target> to <id>. If BeginQueryEXT is called with
* an <id> of zero, if the active query object name for <target> is
* non-zero (for the targets ANY_SAMPLES_PASSED_EXT and
* ANY_SAMPLES_PASSED_CONSERVATIVE_EXT, if the active query for
* either target is non-zero), if <id> is the name of an existing
* query object whose type does not match <target>, or if <id> is
* the active query object name for any query type, the error
* INVALID_OPERATION is generated.
*/
ErrorInvalidOperation("beginQuery: Query should not be null.");
return;
}
if (query->IsDeleted()) {
/* From GLES's EXT_occlusion_query_boolean:
* BeginQueryEXT fails and an INVALID_OPERATION error is generated
* if <id> is not a name returned from a previous call to
* GenQueriesEXT, or if such a name has since been deleted with
* DeleteQueriesEXT.
*/
ErrorInvalidOperation("beginQuery: Query has been deleted.");
return;
}
if (query->HasEverBeenActive() &&
query->mType != target)
{
ErrorInvalidOperation("beginQuery: Target doesn't match with the query"
" type.");
return;
}
if (*targetSlot) {
ErrorInvalidOperation("beginQuery: An other query already active.");
return;
}
if (!query->HasEverBeenActive())
query->mType = target;
MakeContextCurrent();
if (target == LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN) {
gl->fBeginQuery(LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN,
query->mGLName);
} else {
gl->fBeginQuery(SimulateOcclusionQueryTarget(gl, target),
query->mGLName);
}
*targetSlot = query;
}
void
WebGL2Context::EndQuery(GLenum target)
{
if (IsContextLost())
return;
WebGLRefPtr<WebGLQuery>* targetSlot = GetQueryTargetSlot(target);
if (!targetSlot) {
ErrorInvalidEnum("endQuery: unknown query target");
return;
}
if (!*targetSlot ||
target != (*targetSlot)->mType)
{
/* From GLES's EXT_occlusion_query_boolean:
* marks the end of the sequence of commands to be tracked for the
* query type given by <target>. The active query object for
* <target> is updated to indicate that query results are not
* available, and the active query object name for <target> is reset
* to zero. When the commands issued prior to EndQueryEXT have
* completed and a final query result is available, the query object
* active when EndQueryEXT is called is updated by the GL. The query
* object is updated to indicate that the query results are
* available and to contain the query result. If the active query
* object name for <target> is zero when EndQueryEXT is called, the
* error INVALID_OPERATION is generated.
*/
ErrorInvalidOperation("endQuery: There is no active query of type %s.",
GetQueryTargetEnumString(target));
return;
}
MakeContextCurrent();
if (target == LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN) {
gl->fEndQuery(LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN);
} else {
gl->fEndQuery(SimulateOcclusionQueryTarget(gl, target));
}
*targetSlot = nullptr;
}
already_AddRefed<WebGLQuery>
WebGL2Context::GetQuery(GLenum target, GLenum pname)
{
if (IsContextLost())
return nullptr;
WebGLRefPtr<WebGLQuery>* targetSlot = GetQueryTargetSlot(target);
if (!targetSlot) {
ErrorInvalidEnum("getQuery: unknown query target");
return nullptr;
}
if (pname != LOCAL_GL_CURRENT_QUERY) {
/* OpenGL ES 3.0 spec 6.1.7:
* pname must be CURRENT_QUERY.
*/
ErrorInvalidEnum("getQuery: `pname` must be CURRENT_QUERY.");
return nullptr;
}
nsRefPtr<WebGLQuery> tmp = targetSlot->get();
return tmp.forget();
}
void
WebGL2Context::GetQueryParameter(JSContext*, WebGLQuery* query, GLenum pname,
JS::MutableHandleValue retval)
{
retval.set(JS::NullValue());
if (IsContextLost())
return;
if (!query) {
/* OpenGL ES 3.0 spec 6.1.7 (spec getQueryObject 1):
* If id is not the name of a query object, or if the query object
* named by id is currently active, then an INVALID_OPERATION error
* is generated. pname must be QUERY_RESULT or
* QUERY_RESULT_AVAILABLE.
*/
ErrorInvalidOperation("getQueryObject: `query` should not be null.");
return;
}
if (query->IsDeleted()) {
// See (spec getQueryObject 1)
ErrorInvalidOperation("getQueryObject: `query` has been deleted.");
return;
}
if (query->IsActive()) {
// See (spec getQueryObject 1)
ErrorInvalidOperation("getQueryObject: `query` is active.");
return;
}
if (!query->HasEverBeenActive()) {
/* See (spec getQueryObject 1)
* If this instance of WebGLQuery has never been active before, that
* mean that query->mGLName is not a query object yet.
*/
ErrorInvalidOperation("getQueryObject: `query` has never been active.");
return;
}
MakeContextCurrent();
GLuint returned = 0;
switch (pname) {
case LOCAL_GL_QUERY_RESULT_AVAILABLE:
gl->fGetQueryObjectuiv(query->mGLName, LOCAL_GL_QUERY_RESULT_AVAILABLE, &returned);
retval.set(JS::BooleanValue(returned != 0));
return;
case LOCAL_GL_QUERY_RESULT:
gl->fGetQueryObjectuiv(query->mGLName, LOCAL_GL_QUERY_RESULT, &returned);
if (query->mType == LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN) {
retval.set(JS::NumberValue(returned));
return;
}
/*
* test (returned != 0) is important because ARB_occlusion_query on desktop drivers
* return the number of samples drawed when the OpenGL ES extension
* ARB_occlusion_query_boolean return only a boolean if a sample has been drawed.
*/
retval.set(JS::BooleanValue(returned != 0));
return;
default:
break;
}
ErrorInvalidEnum("getQueryObject: `pname` must be QUERY_RESULT{_AVAILABLE}.");
}