From be5a215a6cf7ea53b70777fff849b368288e7e82 Mon Sep 17 00:00:00 2001
From: UnknownShadow200 <unknownshadow200@gmail.com>
Date: Mon, 24 Feb 2025 20:12:22 +1100
Subject: [PATCH] SoftGPU: Optimise tex coord calculation

On test machine with -O1 and 28,000 FPS goes from ~48 to ~52
---
 src/Graphics_SoftGPU.c | 9 +++++----
 src/Window_X11.c       | 6 +++++-
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/Graphics_SoftGPU.c b/src/Graphics_SoftGPU.c
index 94b062b37..156834a82 100644
--- a/src/Graphics_SoftGPU.c
+++ b/src/Graphics_SoftGPU.c
@@ -600,9 +600,10 @@ static void DrawTriangle3D(Vertex* V0, Vertex* V1, Vertex* V2) {
 	}
 
 	float z0 = V0->z, z1 = V1->z, z2 = V2->z;
-	float u0 = V0->u, u1 = V1->u, u2 = V2->u;
-	float v0 = V0->v, v1 = V1->v, v2 = V2->v;
 	PackedCol color = V0->c;
+
+	float u0 = V0->u * curTexWidth,  u1 = V1->u * curTexWidth,  u2 = V2->u * curTexWidth;
+	float v0 = V0->v * curTexHeight, v1 = V1->v * curTexHeight, v2 = V2->v * curTexHeight;
 	
 	// https://fgiesen.wordpress.com/2013/02/10/optimizing-the-basic-rasterizer/
 	// Essentially these are the deltas of edge functions between X/Y and X/Y + 1 (i.e. one X/Y step)
@@ -660,8 +661,8 @@ static void DrawTriangle3D(Vertex* V0, Vertex* V1, Vertex* V2) {
 			if (texturing) {
 				float u = (ic0 * u0 + ic1 * u1 + ic2 * u2) * w;
 				float v = (ic0 * v0 + ic1 * v1 + ic2 * v2) * w;
-				int texX = ((int)(Math_AbsF(u - FastFloor(u)) * curTexWidth )) & texWidthMask;
-				int texY = ((int)(Math_AbsF(v - FastFloor(v)) * curTexHeight)) & texHeightMask;
+				int texX = ((int)u) & texWidthMask;
+				int texY = ((int)v) & texHeightMask;
 
 				int texIndex = texY * curTexWidth + texX;
 				BitmapCol tColor = curTexPixels[texIndex];
diff --git a/src/Window_X11.c b/src/Window_X11.c
index 48e23cf00..9dcc4b03a 100644
--- a/src/Window_X11.c
+++ b/src/Window_X11.c
@@ -371,8 +371,12 @@ static void DoCreateWindow(int width, int height, int _2d) {
 	y = Display_CentreY(height);
 	RegisterAtoms();
 
+#if CC_GFX_BACKEND_IS_GL()
 	win_visual = _2d ? Select2DVisual() : GLContext_SelectVisual();
-	visualID   = win_visual.visual ? win_visual.visual->visualid : 0;
+#else
+	win_visual = Select2DVisual();
+#endif
+	visualID = win_visual.visual ? win_visual.visual->visualid : 0;
 
 	Platform_Log2("Creating window (depth: %i, visual: %h)", &win_visual.depth, &visualID);
 	attributes.colormap   = XCreateColormap(win_display, win_rootWin, win_visual.visual, AllocNone);