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1 // Copyright 2016 The SwiftShader Authors. All Rights Reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //    http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 // TransformFeedback.cpp: Implements the es2::TransformFeedback class
16 
17 #include "TransformFeedback.h"
18 
19 namespace es2
20 {
21 
TransformFeedback(GLuint name)22 TransformFeedback::TransformFeedback(GLuint name) : NamedObject(name), mActive(false), mPaused(false), mVertexOffset(0)
23 {
24 }
25 
~TransformFeedback()26 TransformFeedback::~TransformFeedback()
27 {
28 	for(int i = 0; i < MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS; ++i)
29 	{
30 		mBuffer[i].set(nullptr);
31 	}
32 }
33 
getBuffer(GLuint index) const34 Buffer* TransformFeedback::getBuffer(GLuint index) const
35 {
36 	return mBuffer[index].get();
37 }
38 
getBufferName(GLuint index) const39 GLuint TransformFeedback::getBufferName(GLuint index) const
40 {
41 	return mBuffer[index].get().name();
42 }
43 
getOffset(GLuint index) const44 int TransformFeedback::getOffset(GLuint index) const
45 {
46 	return mBuffer[index].getOffset();
47 }
48 
getSize(GLuint index) const49 int TransformFeedback::getSize(GLuint index) const
50 {
51 	return mBuffer[index].getSize();
52 }
53 
addVertexOffset(int count)54 void TransformFeedback::addVertexOffset(int count)
55 {
56 	if(isActive() && !isPaused())
57 	{
58 		mVertexOffset += count;
59 	}
60 }
61 
vertexOffset() const62 int TransformFeedback::vertexOffset() const
63 {
64 	return mVertexOffset;
65 }
66 
isActive() const67 bool TransformFeedback::isActive() const
68 {
69 	return mActive;
70 }
71 
isPaused() const72 bool TransformFeedback::isPaused() const
73 {
74 	return mPaused;
75 }
76 
primitiveMode() const77 GLenum TransformFeedback::primitiveMode() const
78 {
79 	return mPrimitiveMode;
80 }
81 
begin(GLenum primitiveMode)82 void TransformFeedback::begin(GLenum primitiveMode)
83 {
84 	mActive = true; mPrimitiveMode = primitiveMode;
85 }
86 
end()87 void TransformFeedback::end()
88 {
89 	mActive = false;
90 	mPaused = false;
91 	mVertexOffset = 0;
92 }
93 
setPaused(bool paused)94 void TransformFeedback::setPaused(bool paused)
95 {
96 	mPaused = paused;
97 }
98 
setBuffer(GLuint index,Buffer * buffer)99 void TransformFeedback::setBuffer(GLuint index, Buffer* buffer)
100 {
101 	mBuffer[index].set(buffer);
102 }
103 
setBuffer(GLuint index,Buffer * buffer,GLintptr offset,GLsizeiptr size)104 void TransformFeedback::setBuffer(GLuint index, Buffer* buffer, GLintptr offset, GLsizeiptr size)
105 {
106 	mBuffer[index].set(buffer, static_cast<int>(offset), static_cast<int>(size));
107 }
108 
detachBuffer(GLuint buffer)109 void TransformFeedback::detachBuffer(GLuint buffer)
110 {
111 	for(int i = 0; i < MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS; ++i)
112 	{
113 		if(mBuffer[i].get().name() == buffer)
114 		{
115 			mBuffer[i].set(nullptr);
116 		}
117 	}
118 }
119 
120 }
121