public SpriteBatch(OpenGL gl, int triCount = 4000)
{
this.gl = gl;
var textureLoaded = this.white1x1Tex.Create(gl, Properties.Resources.white1x1);
if (textureLoaded == false)
{
throw new Exception("white1x1Tex loading failed");
}
_shaderProgram.Create(gl, Properties.Resources.SimpleVS, Properties.Resources.SimplePS, null);
_shaderProgram.BindAttributeLocation(gl, VertexAttributes.Pos, nameof(VertexAttributes.Pos));
_shaderProgram.BindAttributeLocation(gl, VertexAttributes.Color, nameof(VertexAttributes.Color));
_shaderProgram.BindAttributeLocation(gl, VertexAttributes.TexCoord, nameof(VertexAttributes.TexCoord));
_shaderProgram.Bind(gl);
vertices = new VertexPosTexColor[triCount * 3];
indices = new int[triCount * 3];
gl.GenBuffers(1, vertexBufferIds);
gl.BindBuffer(GL_ARRAY_BUFFER, vertexBufferIds[0]);
gl.BufferData(GL_ARRAY_BUFFER, vertices.Length * VertexPosTexColor.SizeOf, IntPtr.Zero, GL_DYNAMIC_DRAW);
gl.GenBuffers(1, indexBufferIds);
gl.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexBufferIds[0]);
gl.BufferData(GL_ELEMENT_ARRAY_BUFFER, indices.Length * sizeof(int), IntPtr.Zero, GL_DYNAMIC_DRAW);
gl.GenVertexArrays(1, vaos);
gl.BindVertexArray(vaos[0]);
gl.EnableVertexAttribArray(VertexAttributes.Pos);
gl.VertexAttribPointer(VertexAttributes.Pos, 3, GL_FLOAT, false, VertexPosTexColor.SizeOf, new IntPtr(0));
gl.EnableVertexAttribArray(VertexAttributes.Color);
gl.VertexAttribPointer(VertexAttributes.Color, 4, GL_UNSIGNED_BYTE, true, VertexPosTexColor.SizeOf, new IntPtr(3 * sizeof(float)));
gl.EnableVertexAttribArray(VertexAttributes.TexCoord);
gl.VertexAttribPointer(VertexAttributes.TexCoord, 2, GL_FLOAT, false, VertexPosTexColor.SizeOf, new IntPtr(3 * sizeof(float) + 4 * sizeof(byte)));
}
public void Bind()
{
shader.Bind(gl);
}