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Reduce hardcoded constants in Lights_GlowCheck, some more comments on the CPU driven depth test and z-buffer value conversion (#1506)

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Tharo 2023-07-04 23:37:31 +01:00 • committed by GitHub
parent 47ffb59f68
commit 54638f9768
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2 changed files with 18 additions and 10 deletions
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11
src/code/z_lights.c
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@ -339,11 +339,18 @@ void Lights_GlowCheck(PlayState* play) {
wY = multDest.y * cappedInvWDest;
if ((multDest.z > 1.0f) && (fabsf(wX) < 1.0f) && (fabsf(wY) < 1.0f)) {
wZ = (s32)((multDest.z * cappedInvWDest) * 16352.0f) + 16352;
zBuf = gZBuffer[(s32)((wY * -120.0f) + 120.0f)][(s32)((wX * 160.0f) + 160.0f)] * 4;
// Compute screen z value assuming the viewport scale and translation both have value G_MAXZ / 2
// The multiplication by 32 follows from how the RSP microcode computes the screen z value.
wZ = (s32)((multDest.z * cappedInvWDest) * ((G_MAXZ / 2) * 32)) + ((G_MAXZ / 2) * 32);
// Obtain the z-buffer value for the screen pixel corresponding to the center of the glow.
zBuf = gZBuffer[(s32)((wY * -(SCREEN_HEIGHT / 2)) + (SCREEN_HEIGHT / 2))]
[(s32)((wX * (SCREEN_WIDTH / 2)) + (SCREEN_WIDTH / 2))]
<< 2;
if (1) {}
if (1) {}
// Compare the computed screen z value to the integer part of the z-buffer value in fixed point. If
// it is less than the value from the z-buffer the depth test passes and the glow can draw.
if (wZ < (Environment_ZBufValToFixedPoint(zBuf) >> 3)) {
params->drawGlow = true;
}