// SetActive will set current camera as the render camera
func (cam *Camera) SetActive() {
state.activeCam = cam
if shader := shader.GetActive(); shader != nil {
gl.UniformMatrix4fv(shader.Projection, 1, false, &cam.projection[0])
gl.UniformMatrix4fv(shader.Camera, 1, false, &cam.loc[0])
}
}
// Draw will draw the billvboard in the x,y and z
func (billboard *Billboard) Draw(x float32, y float32, z float32) {
model := mgl32.Translate3D(x, y, z)
if shader := shader.GetActive(); shader != nil {
gl.UniformMatrix4fv(shader.Model, 1, false, &model[0])
}
gl.BindVertexArray(billboard.vao)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, billboard.image)
gl.DrawArrays(gl.TRIANGLES, 0, 1*2*3)
}
// DrawFrame will draw the sprite in the x,y and z with the specified frame from a spritesheet
func (sprite *Sprite) DrawFrame(x float32, y float32, z float32, scale float32, frame int) {
model := mgl32.Translate3D(x, y, z)
model = model.Mul4(mgl32.Scale3D(scale, scale, 1))
// remember this is in radians!
// model = model.Mul4(mgl32.HomogRotate3D(mgl32.DegToRad(90), mgl32.Vec3{0, 0, 1}))
if shader := shader.GetActive(); shader != nil {
gl.UniformMatrix4fv(shader.Model, 1, false, &model[0])
}
gl.BindVertexArray(sprite.vao)
sprite.image.Bind()
gl.DrawArrays(gl.TRIANGLES, int32(frame*6), 6)
}