public VertexBuffer GetVertexAttributeBuffer(string bufferName, string varNameInShader)
{
if (bufferName == strPosition)
{
if (this.positionBuffer == null)
{
var array = new vec4[particleCount];
for (int i = 0; i < particleCount; i++)
{
array[i] = new vec4(
(float)(random.NextDouble() - 0.5) * 20,
(float)(random.NextDouble() - 0.5) * 20,
(float)(random.NextDouble() - 0.5) * 20,
(float)(random.NextDouble())
);
}
VertexBuffer buffer = array.GenVertexBuffer(VBOConfig.Vec4, varNameInShader, BufferUsage.DynamicCopy);
this.positionBuffer = buffer;
}
return(this.positionBuffer);
}
else if (bufferName == strVelocity)
{
if (this.velocityBuffer == null)
{
var array = new vec4[particleCount];
for (int i = 0; i < particleCount; i++)
{
array[i] = new vec4(
(float)(random.NextDouble() - 0.5) * 0.2f,
(float)(random.NextDouble() - 0.5) * 0.2f,
(float)(random.NextDouble() - 0.5) * 0.2f,
0
);
}
VertexBuffer buffer = array.GenVertexBuffer(VBOConfig.Vec4, varNameInShader, BufferUsage.StaticDraw);
this.velocityBuffer = buffer;
}
return(this.velocityBuffer);
}
else
{
throw new ArgumentException();
}
}