static void shadowStuff(RenderPass basePass, RenderPass lightPass, Texture shadowTexture) {
Mat4 viewTransform = basePass.getView().getCameraMatrix();
Mat4 lightTransform = lightPass.getView().getCameraMatrix();
Mat4 homogenToTexCoord = new Mat4().translate(0.5f, 0.5f, 0.5f).scale(0.5, 0.5, 0.5);
Mat4 viewToTexture = new Mat4();
viewToTexture.mul(homogenToTexCoord);
viewToTexture.mul(lightPass.getView().getProjectionMatrix());
viewToTexture.mul_(new Mat4(lightTransform));
viewToTexture.mul_(new Mat4(viewTransform).invert_());
Mat4 lightToView = new Mat4();
lightToView.mul_(new Mat4(viewTransform));
lightToView.mul_(new Mat4(lightTransform).invert_());
Vec3 lightPosVS = lightToView.transformAsPoint(new Vec3());
Shader shader = createShader(viewToTexture);
shader.putUniform(new Uniform("lightPosVS", Uniform.Type.VEC3, lightPosVS.toFloats()));
for (Shape shape : basePass.getAllShapes()) {
shape.getState().setShader(shader);
shape.getState().setUnit(0, new Unit(shadowTexture));
}
Shader spotLightShader = new Shader(loadProgram("storeMoments"));
for (Shape shape : lightPass.getAllShapes()) {
shape.getState().setShader(spotLightShader);
}
}
static float[] getTransposedFloats(Mat4 transform) {
Mat4 m = new Mat4(transform);
m.transpose();
return m.toFloats();
}