Fix for glBindTransformFeedback and glDeleteTransformFeedbacks

Added proper checks for invalid operations.

Fixes all remaining failures in dEQP-GLES3.functional.lifetime*

Change-Id: Ia91ffdb8ced53f1f787b82ada0de22caf9ee9206
Reviewed-on: https://swiftshader-review.googlesource.com/13748
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/OpenGL/libGLESv2/Context.cpp

diff --git a/src/OpenGL/libGLESv2/Context.cpp b/src/OpenGL/libGLESv2/Context.cpp
index 9eefb3f..360891a 100644
--- a/src/OpenGL/libGLESv2/Context.cpp
+++ b/src/OpenGL/libGLESv2/Context.cpp
@@ -1511,6 +1511,11 @@
 	return mTransformFeedbackNameSpace.find(transformFeedback);
 }
 
+bool Context::isTransformFeedback(GLuint array) const
+{
+	return mTransformFeedbackNameSpace.isReserved(array);
+}
+
 Sampler *Context::getSampler(GLuint sampler) const
 {
 	return mResourceManager->getSampler(sampler);

src/OpenGL/libGLESv2/Context.h

diff --git a/src/OpenGL/libGLESv2/Context.h b/src/OpenGL/libGLESv2/Context.h
index d00f545..ac29824 100644
--- a/src/OpenGL/libGLESv2/Context.h
+++ b/src/OpenGL/libGLESv2/Context.h
@@ -632,6 +632,7 @@
 	VertexArray *getCurrentVertexArray() const;
 	bool isVertexArray(GLuint array) const;
 	TransformFeedback *getTransformFeedback(GLuint transformFeedback) const;
+	bool isTransformFeedback(GLuint transformFeedback) const;
 	TransformFeedback *getTransformFeedback() const;
 	Sampler *getSampler(GLuint sampler) const;
 	bool isSampler(GLuint sampler) const;

src/OpenGL/libGLESv2/libGLESv3.cpp

diff --git a/src/OpenGL/libGLESv2/libGLESv3.cpp b/src/OpenGL/libGLESv2/libGLESv3.cpp
index a300753..c4b1207 100644
--- a/src/OpenGL/libGLESv2/libGLESv3.cpp
+++ b/src/OpenGL/libGLESv2/libGLESv3.cpp
@@ -3487,6 +3487,11 @@
 			return error(GL_INVALID_OPERATION);
 		}
 
+		if(!context->isTransformFeedback(id))
+		{
+			return error(GL_INVALID_OPERATION);
+		}
+
 		context->bindTransformFeedback(id);
 	}
 }
@@ -3508,6 +3513,13 @@
 		{
 			if(ids[i] != 0)
 			{
+				es2::TransformFeedback *transformFeedbackObject = context->getTransformFeedback(ids[i]);
+
+				if(transformFeedbackObject && transformFeedbackObject->isActive())
+				{
+					return error(GL_INVALID_OPERATION);
+				}
+
 				context->deleteTransformFeedback(ids[i]);
 			}
 		}