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Henrik Rydgård 2025-01-18 12:47:36 +01:00
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GPU/Common/GPUStateUtils.cpp
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@ -651,6 +651,27 @@ void ConvertViewportAndScissor(bool useBufferedRendering, float renderWidth, flo
// The viewport is normally centered at 2048,2048 but can also be centered at other locations.
// Offset is subtracted from the viewport center and is also set to values in those ranges, and is set so that the viewport will cover
// the desired screen area ([0-480)x[0-272)), so 1808,1912.
//
// TODO: We could also add detection here for if the viewport is set up for 2D graphics,
// so we can force point filtering for 2D graphics.
//
// Some setups for that (found in Outrun, for example):
//
// viewportScaleX/Y: 2048
// viewportOffsetX/Y: 2048
// offset: 2048-240, 2048-136
//
// Another one (Wipeout Pulse title screen):
//
// viewportScaleX/Y: 240, -136 (must be combined with a specific projection matrix)
// 2048,2048
//
// If we see these setups, we can force software transform, and then perform pixel-mapping checking
// similar to the various setups in SoftwareTransformCommon.
//
// We can also detect this pixel mapped setup in a universal way, by transforming the coordinates
// (0,0) and (480,272) through the current projection matrix + viewport transform,
// and then checking if they come out the same (or very close to it) on the other end.
// This means that to get the analogue glViewport we must:
float vpX0 = vpXCenter - offsetX - fabsf(vpXScale);