static void update_scissor_test(){
    if (scissor_test_state){
        scissor_test_vertices[0].position.x = ((2.0f * region.x) / 960.0f) - 1.0f;
        scissor_test_vertices[0].position.y = ((2.0f * region.y) / 544.0f) - 1.0f;
        scissor_test_vertices[1].position.x = ((2.0f * (region.x + region.w)) / 960.0f) - 1.0f;
        scissor_test_vertices[1].position.y = ((2.0f * region.y) / 544.0f) - 1.0f;
        scissor_test_vertices[2].position.x = ((2.0f * region.x) / 960.0f) - 1.0f;
        scissor_test_vertices[2].position.y = ((2.0f * (region.y + region.h)) / 960.0f) - 1.0f;
        scissor_test_vertices[3].position.x = ((2.0f * (region.x + region.w)) / 960.0f) - 1.0f;
        scissor_test_vertices[3].position.y = ((2.0f * (region.y + region.h)) / 960.0f) - 1.0f;
    }else{
        scissor_test_vertices[0].position = (vector2f){-1.0f, -1.0f};
        scissor_test_vertices[1].position = (vector2f){ 1.0f, -1.0f};
        scissor_test_vertices[2].position = (vector2f){-1.0f,  1.0f};
        scissor_test_vertices[3].position = (vector2f){ 1.0f,  1.0f};
    }
    sceGxmSetVertexProgram(gxm_context, clear_vertex_program_patched);
    sceGxmSetFragmentProgram(gxm_context, scissor_test_fragment_program);

    invalidate_depth_test();
    change_depth_write(SCE_GXM_DEPTH_WRITE_ENABLED);

    sceGxmSetFrontStencilFunc(gxm_context,
        SCE_GXM_STENCIL_FUNC_NEVER,
        SCE_GXM_STENCIL_OP_KEEP,
        SCE_GXM_STENCIL_OP_KEEP,
        SCE_GXM_STENCIL_OP_KEEP,
        0, 0);
    sceGxmSetBackStencilFunc(gxm_context,
        SCE_GXM_STENCIL_FUNC_NEVER,
        SCE_GXM_STENCIL_OP_KEEP,
        SCE_GXM_STENCIL_OP_KEEP,
        SCE_GXM_STENCIL_OP_KEEP,
        0, 0);

    sceGxmSetVertexStream(gxm_context, 0, clear_vertices);
    sceGxmDraw(gxm_context, SCE_GXM_PRIMITIVE_TRIANGLE_FAN, SCE_GXM_INDEX_FORMAT_U16, clear_indices, 4);

    sceGxmSetFrontStencilFunc(gxm_context,
        SCE_GXM_STENCIL_FUNC_ALWAYS,
        SCE_GXM_STENCIL_OP_KEEP,
        SCE_GXM_STENCIL_OP_KEEP,
        SCE_GXM_STENCIL_OP_KEEP,
        0, 0);
    sceGxmSetBackStencilFunc(gxm_context,
        SCE_GXM_STENCIL_FUNC_ALWAYS,
        SCE_GXM_STENCIL_OP_KEEP,
        SCE_GXM_STENCIL_OP_KEEP,
        SCE_GXM_STENCIL_OP_KEEP,
        0, 0);

    sceGxmSetVertexStream(gxm_context, 0, scissor_test_vertices);
    sceGxmDraw(gxm_context, SCE_GXM_PRIMITIVE_TRIANGLE_FAN, SCE_GXM_INDEX_FORMAT_U16, clear_indices, 4);

    validate_depth_test();
    change_depth_write(depth_mask_state && depth_test_state ? SCE_GXM_DEPTH_WRITE_ENABLED : SCE_GXM_DEPTH_WRITE_DISABLED);

}