Merge Plan

OpenGL Hardware Renderer

1. Graphics Backend INI setting

• Just a new string setting to choose between Software/OpenGL/D3D/...

2. Core Implementation

• OpenGL maintains one framebuffer
• Triangles are sent to either Software or OpenGL renderer
• OpenGL renders into its framebuffer and commits/reloads color/depth buffers from 3ds memory at critical points (swapbuffers/memfill/copy/...)
• OpenGL maintains cache of textures, added when new framebuffer texture address is accessed, deleted when dma transfer or flushdata touches it

3. GLSL Translator

• Translates PICA vertex shaders to GLSL at runtime, and uses them instead of current vertex shader interpreter
• Provides a -really good- performance boost
• Could pose integration issues if geometry shaders can't be emulated in hardware since it's dirty to get output of GLSL vertex shader

4. HD Rendering

• Maintain an OpenGL framebuffer for -each existing- 3ds framebuffer at enhanced resolution
• For commits/reloads, downscale/upscale the framebuffer to work as normal
• For commits to a screen framebuffer, also copy texture directly to OpenGL frontend screen texture, and circumvent the normal reload from framebuffer to that screen texture

Related But Non-Critical

1. Divide by zero fix

• Simple epsilon check for divide by zero in vertex shader interpreter to prevent corrupted colors - not sure if this is root cause though