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57 lines
1.9 KiB
Markdown
57 lines
1.9 KiB
Markdown
# IIDX 24 GFX upscaling notes
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Date: 2023-04-15
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Author: icex2
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Notes about my work on fixing the upscaling/downscaling feature of bemanitools for IIDX 20 to 26.
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I realized that the render backend changed significantly that the old method that worked fine
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doesn't work anymore.
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The tool used in the screenshots is [apitrace](https://github.com/apitrace/apitrace).
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## IIDX 24
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The GFX engine in IIDX from 20 to 26 has a changed render loop that includes built-in scaling to
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implement the SD and HD/HD* screen settings that are selectable in the operator menu
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### Frame 0 - GFX init part
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Setting up the context and device, as well as the frame buffer. This also creates the intermediate
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texture that is configured as the render target once it begins drawing the scene.
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### Frame 1 - A clean main render path
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Start the scene and set the render target to the intermediate texture.
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After done drawing the scene, the intermediate texture is blended to the framebuffer. With a target
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2D plane having the size of the target resolution, the blending applies linear scaling to either
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up- or downscale the final image.
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## IIDX 10
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A recap of the old stuff, see also [my previous notes](2019-10-07-iidx-gfx-rendering-loops.md),
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as I had to look at everything again to properly understand the differences.
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### Frame 0 - GFX init part
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Setting up the context and device, as well as the frame buffer. Renders directly to the frame
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buffer.
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### Frame 1 - A clean main render path
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Beginning the scene excerpt. The viewport needs to match the target resolution to display the
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final image correctly.
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Ending the scene excerpt, nothing fancy here, just swapping the back buffer.
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