func MarchingCubes(volume Volume, extents math3d.Vector, cubeSize float32) *render.Mesh {
defer util.EndTiming(util.StartTiming("MarchingCubes(%v, %v, %v)", volume, extents, cubeSize))
var verticies []math3d.Vector
var x, y, z float32
if cubeSize <= 0 {
panic("Cube size was 0 or negative!")
}
// FIXME, seed at the start of the game
r := rand.New(rand.NewSource(100))
finalMesh := new(render.Mesh)
for x = 0; x < extents.X; x += cubeSize {
for y = 0; y < extents.Y; y += cubeSize {
for z = 0; z < extents.Z; z += cubeSize {
verticies = marchCube(volume, x, y, z, cubeSize)
for _, vertex := range verticies {
finalMesh.VertexList = append(finalMesh.VertexList, vertex.X)
finalMesh.VertexList = append(finalMesh.VertexList, vertex.Y)
finalMesh.VertexList = append(finalMesh.VertexList, vertex.Z)
finalMesh.ColorList = append(finalMesh.ColorList, r.Float32())
finalMesh.ColorList = append(finalMesh.ColorList, r.Float32())
finalMesh.ColorList = append(finalMesh.ColorList, r.Float32())
}
}
}
}
return finalMesh
}
func (self *OpenGLRenderer) LoadMesh(mesh *render.Mesh) {
if len(mesh.VertexList) == 0 {
log.Println("WARNING Stopping load of mesh [", mesh.Name, "] with no verticies")
return
}
vertexArrayObj := gl.GenVertexArray()
vertexArrayObj.Bind()
vertexBuffer := gl.GenBuffer()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(mesh.VertexList)*4, mesh.VertexList, gl.STATIC_DRAW)
attribLoc := gl.AttribLocation(0)
attribLoc.EnableArray()
attribLoc.AttribPointer(3, gl.FLOAT, false, 0, nil)
if len(mesh.UVList) > 0 {
uvBuffer := gl.GenBuffer()
uvBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(mesh.UVList)*4, mesh.UVList, gl.STATIC_DRAW)
attribLoc := gl.AttribLocation(1)
attribLoc.EnableArray()
attribLoc.AttribPointer(2, gl.FLOAT, false, 0, nil)
mesh.UVBuffer = uvBuffer
} else if len(mesh.ColorList) > 0 {
colorBuffer := gl.GenBuffer()
colorBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(mesh.ColorList)*4, mesh.ColorList, gl.STATIC_DRAW)
attribLoc := gl.AttribLocation(1)
attribLoc.EnableArray()
attribLoc.AttribPointer(3, gl.FLOAT, false, 0, nil)
mesh.ColorBuffer = colorBuffer
}
if len(mesh.IndexList) > 0 {
indexBuffer := gl.GenBuffer()
indexBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(mesh.IndexList)*4, mesh.IndexList, gl.STATIC_DRAW)
mesh.IndexBuffer = indexBuffer
}
mesh.VertexArrayObj = vertexArrayObj
mesh.VertexBuffer = vertexBuffer
}
// UnloadMesh clears out all of the buffers and the VAO for the given mesh
func (self *OpenGLRenderer) UnloadMesh(mesh *render.Mesh) {
if mesh.VertexArrayObj == nil {
log.Println("WARNING Stopping unload of mesh [", mesh.Name, "] which seems to be already unloaded")
return
}
self.deleteBuffer(mesh.VertexBuffer)
mesh.VertexBuffer = nil
self.deleteBuffer(mesh.ColorBuffer)
mesh.ColorBuffer = nil
self.deleteBuffer(mesh.UVBuffer)
mesh.UVBuffer = nil
self.deleteBuffer(mesh.IndexBuffer)
mesh.IndexBuffer = nil
mesh.VertexArrayObj.(gl.VertexArray).Delete()
mesh.VertexArrayObj = nil
}