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IIDX 24 GFX upscaling notes
Date: 2023-04-15 Author: icex2
Notes about my work on fixing the upscaling/downscaling feature of bemanitools for IIDX 20 to 26. I realized that the render backend changed significantly that the old method that worked fine doesn't work anymore.
The tool used in the screenshots is apitrace.
IIDX 24
The GFX engine in IIDX from 20 to 26 has a changed render loop that includes built-in scaling to implement the SD and HD/HD* screen settings that are selectable in the operator menu
Frame 0 - GFX init part
Setting up the context and device, as well as the frame buffer. This also creates the intermediate texture that is configured as the render target once it begins drawing the scene.
Frame 1 - A clean main render path
Start the scene and set the render target to the intermediate texture.
After done drawing the scene, the intermediate texture is blended to the framebuffer. With a target 2D plane having the size of the target resolution, the blending applies linear scaling to either up- or downscale the final image.
IIDX 10
A recap of the old stuff, see also my previous notes, as I had to look at everything again to properly understand the differences.
Frame 0 - GFX init part
Setting up the context and device, as well as the frame buffer. Renders directly to the frame buffer.
Frame 1 - A clean main render path
Beginning the scene excerpt. The viewport needs to match the target resolution to display the final image correctly.
Ending the scene excerpt, nothing fancy here, just swapping the back buffer.
