An apparatus and method are described for a high throughput rasterizer. For example, one embodiment of an apparatus comprises: block selection logic to select a plurality of pixel blocks associated with edges of a primitive, the plurality of pixel blocks selected based on the pixel blocks having samples which are both inside and outside of the primitive; and edge determination logic to analyze samples of the plurality of pixel blocks selected by the block selection logic and responsively generate data identifying each edge of the primitive; and final mask determination logic to combine the data identifying each edge and generate a final mask representing the primitive.