Method and apparatus for rendering perspective-correct images for a tilted multi-display environment

A method of generating a multi-screen rendering, said method comprising:

• with respect to a three dimensional represented space comprising three dimensional defined objects therein, using a single pass of a geometry engine of a graphics processor to generate a projection, in 2 dimensions, of said space as viewed from a camera on multiple viewports, said multiple viewports defined within a common plane that is perpendicular to a direction of view of said camera and wherein said common plane is located a distance, D, from said camera;
• said geometry engine outputting triangles corresponding to tilted viewports of said multiple viewports to respective triangle transformation engines wherein triangles corresponding to each tilted viewport are send to a corresponding triangle transformation engine, wherein each respective triangle transformation engine adjusts input triangles based on:
• 1) a tilt angle of a corresponding viewport;
• 2) said distance D;
• and 3) a location in 3D space of said corresponding viewport to generate output corrected triangles that are perspective corrected for each tilted viewport;
• outputting corrected triangles from said triangle transformation engines to a rasterizer for generating a frame buffer bitmap for each viewport of said multiple viewports;
• and
• rendering frame buffers from said rasterizer onto said multiple viewports.

An apparatus for generating a multi-screen rendering for a titled multi-monitor display system, said apparatus comprising:

• a processor and memory configured to execute instructions of an application that renders three-dimensional environments;
• and
• a graphics processing unit communicatively coupled to the processor and the memory, wherein the graphics processing unit is configured to perform a method of generating a multi-screen rendering for the titled multi-monitor display system, said method comprising:
• assigning viewports to a center monitor, a first peripheral monitor, and a second peripheral monitor based on a location and orientation of a virtual camera, wherein the first peripheral monitor and the second peripheral monitor are tilted at an angle relative to the center monitor, wherein the viewports are defined within a common plane that is perpendicular to a direction of view of said virtual camera, and wherein the center monitor, the first peripheral monitor, and the second peripheral monitor are communicatively coupled to the graphics processing unit;
• determining scene data for the viewports;
• generating geometric primitives for the viewports based on the scene data for the center monitor, the first peripheral monitor, and the second peripheral monitor using a single pass of a geometry engine;
• performing image transformation on the geometric primitives using respective transformation engines for the center monitor, the first peripheral monitor, and the second peripheral monitor, wherein the image transformation is based on the angle relative to the center monitor and a distance between the virtual camera and the plane, and wherein the image transformation outputs geometric primitives with modified geometry to prevent image distortion of geometric primitives rendered on the first peripheral monitor and the second peripheral monitor;
• and
• rasterizing the geometric primitives using the modified geometry.