带浮点和字节的java交错VBO
我想在交错的OpenGL vbo中存储三个浮点值和两个字节值。 不幸的是,渲染的数据显然不正确。 当我用两个不同的VBO渲染相同的数据时,所有这些都工作得很好,所以我不认为我的着色器有问题
/*
* 20^3 blocks per chunk, 6 faces per block, 3 vertices per face
* max. every second face can be visible
*/
private static final int MAX_FLOAT_AMOUNT = 20 * 20 * 20 * 6 * 3 / 2;
/*
* 20^3 blocks per chunk, 6 faces per block, 2 bytes per face
* max. every second face can be visible
*/
private static final int MAX_BYTE_AMOUNT = 20 * 20 * 20 * 6 * 2 / 2;
private int dataVboIndex;
protected int vaoId;
protected int indicesCount;
protected boolean isInitialized = false;
public static ByteBuffer dataFloatBuffer = BufferUtils.createByteBuffer(4 * MAX_FLOAT_AMOUNT + MAX_BYTE_AMOUNT);
DefaultChunkVao(int indiciesVboId) {
init();
}
DefaultChunkVao(boolean initialize) {
if(initialize) init();
}
private void init() {
isInitialized = true;
// bind vao
vaoId = glGenVertexArrays();
glBindVertexArray(vaoId);
//create vbo
dataVboIndex = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, dataVboIndex);
dataFloatBuffer.clear();
dataFloatBuffer.position(4 * MAX_FLOAT_AMOUNT + MAX_BYTE_AMOUNT);
dataFloatBuffer.flip();
// allocate memory
glBufferData(GL_ARRAY_BUFFER, dataFloatBuffer, GL_STREAM_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, false, 3 * 4 + 2, 0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 1, GL_UNSIGNED_BYTE, false, 3 * 4 + 2, 3 * 4);
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 1, GL_UNSIGNED_BYTE, false, 3 * 4 + 2, 3 * 4 + 1);
// unbind vao
glBindVertexArray(0);
}
public void updateData(float[] data) {
if(!isInitialized) init();
dataFloatBuffer.clear();
for(int counter = 0; counter < data.length; counter+=0) {
dataFloatBuffer.putFloat(data[counter++]);
dataFloatBuffer.putFloat(data[counter++]);
dataFloatBuffer.putFloat(data[counter++]);
dataFloatBuffer.put((byte) data[counter++]);
dataFloatBuffer.put((byte) data[counter++]);
}
dataFloatBuffer.flip();
glBindBuffer(GL_ARRAY_BUFFER, dataVboIndex);
glBufferSubData(GL_ARRAY_BUFFER, 0, dataFloatBuffer);
glBindBuffer(GL_ARRAY_BUFFER, 0);
this.indicesCount = data.length / 5;
}
MAX_FLOAT_AMOUNT
和MAX_BYTE_AMOUNT
常量包含浮点数。每个VBO的字节数。当我确定ByteBuffer
的容量时,我假设浮点数乘以4是对的,因为每个浮点数都有4个字节
我犯了什么错误,我的字节值在着色器中总是0
编辑:我能够用一个更简单的例子重现这个问题。这里我想在VBO中存储位置和两个字节。在片段着色器中,我检查字节1值是否正确传递。如果是这样,着色器会将形状渲染为绿色,否则渲染为蓝色。不幸的是,我的形状呈现为蓝色,因此我假设字节1值传递不正确
顶点着色器
#version 400 core
in vec3 position;
in int byte1;
in int byte2;
flat out int p_byte1;
flat out int p_byte2;
void main(void) {
gl_Position = vec4(position, 1);
p_byte1 = byte1;
p_byte2 = byte2;
}
碎片着色器:
#version 400 core
flat in int p_byte1;
flat in int p_byte2;
out vec3 out_color;
void main(void) {
if(p_byte1 == 45) {
out_color = vec3(0, 1, 0);
} else out_color = vec3(0, 0, 1);
}
创建VAO:
vaoId = glGenVertexArrays();
glBindVertexArray(vaoId);
final int vbo = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, vbo);
float[] data = {0, 0, 0, 20f, 20f, 1, 1, 1, 20f, 20f, 1, 0, 1, 20f, 20f, 0, 1, 1, 20f, 20f};
ByteBuffer dataBuffer = BufferUtils.createByteBuffer(4 * (3 * 4) + 1 * (2 * 4));
for(int counter = 0; counter < data.length; counter+=0) {
dataBuffer.putFloat(data[counter++]);
dataBuffer.putFloat(data[counter++]);
dataBuffer.putFloat(data[counter++]);
dataBuffer.put((byte) data[counter++]);
dataBuffer.put((byte) data[counter++]);
}
dataBuffer.flip();
glBufferData(GL_ARRAY_BUFFER, dataBuffer, GL_STREAM_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, false, 3 * 4 + 2, 0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 1, GL_UNSIGNED_BYTE, false, 3 * 4 + 2, 3 * 4);
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 1, GL_UNSIGNED_BYTE, false, 3 * 4 + 2, 3 * 4 + 1);
glBindVertexArray(0);
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