gecko-dev/dom/canvas/WebGL2ContextTransformFeedb...

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/* -*- 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 "WebGLActiveInfo.h"
#include "WebGLProgram.h"
#include "WebGLTransformFeedback.h"
#include "GLContext.h"
namespace mozilla {
// -------------------------------------------------------------------------
// Transform Feedback
already_AddRefed<WebGLTransformFeedback>
WebGL2Context::CreateTransformFeedback()
{
if (IsContextLost())
return nullptr;
GLuint tf = 0;
MakeContextCurrent();
gl->fGenTransformFeedbacks(1, &tf);
nsRefPtr<WebGLTransformFeedback> globj = new WebGLTransformFeedback(this, tf);
return globj.forget();
}
void
WebGL2Context::DeleteTransformFeedback(WebGLTransformFeedback* tf)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("deleteTransformFeedback", tf))
return;
if (!tf || tf->IsDeleted())
return;
if (mBoundTransformFeedback == tf)
BindTransformFeedback(LOCAL_GL_TRANSFORM_FEEDBACK, tf);
tf->RequestDelete();
}
bool
WebGL2Context::IsTransformFeedback(WebGLTransformFeedback* tf)
{
if (IsContextLost())
return false;
if (!ValidateObjectAllowDeleted("isTransformFeedback", tf))
return false;
if (tf->IsDeleted())
return false;
MakeContextCurrent();
return gl->fIsTransformFeedback(tf->mGLName);
}
void
WebGL2Context::BindTransformFeedback(GLenum target, WebGLTransformFeedback* tf)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("bindTransformFeedback", tf))
return;
if (target != LOCAL_GL_TRANSFORM_FEEDBACK)
return ErrorInvalidEnum("bindTransformFeedback: target must be TRANSFORM_FEEDBACK");
WebGLRefPtr<WebGLTransformFeedback> currentTF = mBoundTransformFeedback;
if (currentTF && currentTF->mIsActive && !currentTF->mIsPaused) {
return ErrorInvalidOperation("bindTransformFeedback: Currently bound transform "
"feedback is active and not paused");
}
if (tf && tf->IsDeleted())
return ErrorInvalidOperation("bindTransformFeedback: Attempt to bind deleted id");
MakeContextCurrent();
gl->fBindTransformFeedback(target, tf ? tf->mGLName : 0);
if (tf)
mBoundTransformFeedback = tf;
else
mBoundTransformFeedback = mDefaultTransformFeedback;
}
void
WebGL2Context::BeginTransformFeedback(GLenum primitiveMode)
{
if (IsContextLost())
return;
WebGLTransformFeedback* tf = mBoundTransformFeedback;
MOZ_ASSERT(tf);
if (!tf)
return;
if (tf->mIsActive)
return ErrorInvalidOperation("beginTransformFeedback: transform feedback is active");
const GLenum mode = tf->mMode;
if (mode != LOCAL_GL_POINTS && mode != LOCAL_GL_LINES && mode != LOCAL_GL_TRIANGLES)
return ErrorInvalidEnum("beginTransformFeedback: primitive must be one of POINTS, LINES, or TRIANGLES");
// TODO:
// GL_INVALID_OPERATION is generated by glBeginTransformFeedback
// if any binding point used in transform feedback mode does not
// have a buffer object bound. In interleaved mode, only the first
// buffer object binding point is ever written to.
// GL_INVALID_OPERATION is generated by glBeginTransformFeedback
// if no binding points would be used, either because no program
// object is active of because the active program object has
// specified no varying variables to record.
if (!mCurrentProgram)
return ErrorInvalidOperation("beginTransformFeedback: no program is active");
MakeContextCurrent();
gl->fBeginTransformFeedback(primitiveMode);
tf->mIsActive = true;
tf->mIsPaused = false;
}
void
WebGL2Context::EndTransformFeedback()
{
if (IsContextLost())
return;
WebGLTransformFeedback* tf = mBoundTransformFeedback;
MOZ_ASSERT(tf);
if (!tf)
return;
if (!tf->mIsActive)
return ErrorInvalidOperation("%s: transform feedback in not active",
"endTransformFeedback");
MakeContextCurrent();
gl->fEndTransformFeedback();
tf->mIsActive = false;
tf->mIsPaused = false;
}
void
WebGL2Context::PauseTransformFeedback()
{
if (IsContextLost())
return;
WebGLTransformFeedback* tf = mBoundTransformFeedback;
MOZ_ASSERT(tf);
if (!tf)
return;
if (!tf->mIsActive || tf->mIsPaused) {
return ErrorInvalidOperation("%s: transform feedback is not active or is paused",
"pauseTransformFeedback");
}
MakeContextCurrent();
gl->fPauseTransformFeedback();
tf->mIsPaused = true;
}
void
WebGL2Context::ResumeTransformFeedback()
{
if (IsContextLost())
return;
WebGLTransformFeedback* tf = mBoundTransformFeedback;
MOZ_ASSERT(tf);
if (!tf)
return;
if (!tf->mIsActive || !tf->mIsPaused)
return ErrorInvalidOperation("resumeTransformFeedback: transform feedback is not active or is not paused");
MakeContextCurrent();
gl->fResumeTransformFeedback();
tf->mIsPaused = false;
}
void
WebGL2Context::TransformFeedbackVaryings(WebGLProgram* program,
const dom::Sequence<nsString>& varyings,
GLenum bufferMode)
{
if (IsContextLost())
return;
if (!ValidateObject("transformFeedbackVaryings: program", program))
return;
program->TransformFeedbackVaryings(varyings, bufferMode);
}
already_AddRefed<WebGLActiveInfo>
WebGL2Context::GetTransformFeedbackVarying(WebGLProgram* program, GLuint index)
{
if (IsContextLost())
return nullptr;
if (!ValidateObject("getTransformFeedbackVarying: program", program))
return nullptr;
return program->GetTransformFeedbackVarying(index);
}
} // namespace mozilla