From 847962910f0bff071f3bf07c9abb87764fb6cac3 Mon Sep 17 00:00:00 2001 From: claude-bot Date: Mon, 13 Jul 2026 12:40:03 +0000 Subject: Import aap/librw @ master Snapshot for re3/reVC vendoring, per @lzcnt. Source: https://github.com/aap/librw (master). --- tools/ps2test/vu/setup_persp.vu | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 tools/ps2test/vu/setup_persp.vu (limited to 'tools/ps2test/vu/setup_persp.vu') diff --git a/tools/ps2test/vu/setup_persp.vu b/tools/ps2test/vu/setup_persp.vu new file mode 100644 index 0000000..b9ea42f --- /dev/null +++ b/tools/ps2test/vu/setup_persp.vu @@ -0,0 +1,39 @@ +/* This is the the projection matrix we start with: + * 1/2w 0 ox/2w + 1/2 -ox/2w + * 0 -1/2h -oy/2h + 1/2 oy/2h + * 0 0 1 0 + * 0 0 1 0 + * To get rid of the +1/2 in the combined matrix we + * subtract the z-row/2 from the x- and y-rows. + * + * The z-row is then set to [0 0 0 1] such that multiplication + * by XYZscale gives [0 0 0 zScale]. After perspective division + * and addition of XYZoffset we then get zScale/w + zShift for z. + * + * XYZScale scales xy to the resolution and z by zScale. + * XYZOffset translates xy to the GS coordinate system (where + * [2048, 2048] is the center of the frame buffer) and add zShift to z. + */ + +; constant: +; VF28-VF31 transformation matrix +; VF25 XYZ offset + + + SUB.z VF28, VF28, VF28 LOI 0.5 ; right.z = 0 + SUB.z VF29, VF29, VF29 LQ VF28, matrix(VI00) ; up.z = 0 - load matrix + SUB.z VF30, VF30, VF30 LQ VF29, matrix+1(VI00) ; at.z = 0 - load matrix + ADDw.z VF31, VF00, VF00 LQ VF30, matrix+2(VI00) ; at.z = 1 - load matrix + NOP LQ VF31, matrix+3(VI00) ; - load matrix + MULi.w VF20, VF28, I LQ.xyz VF01, XYZScale(VI00) ; fix matrix - load scale + MULi.w VF21, VF29, I NOP ; fix matrix + MULi.w VF22, VF30, I NOP ; fix matrix + MULi.w VF23, VF31, I NOP ; fix matrix + SUBw.xy VF28, VF28, VF20 NOP ; fix matrix + SUBw.xy VF29, VF29, VF21 NOP ; fix matrix + SUBw.xy VF30, VF30, VF22 NOP ; fix matrix + SUBw.xy VF31, VF31, VF23 NOP ; fix matrix + MUL.xy VF28, VF28, VF01 LQ.xyz VF25, XYZOffset(VI00) ; scale matrix + MUL.xy VF29, VF29, VF01 IADDIU VI12, VI00, outBuf1 ; scale matrix + MUL.xy VF30, VF30, VF01 IADDIU VI13, VI00, outBuf2 ; scale matrix + MUL.xyz VF31, VF31, VF01 NOP ; scale matrix -- cgit v1.2.3