From 2693d0e46cf55c613e560d2eed8a2f762fe76bb5 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sat, 6 Jul 2024 18:40:57 +1000
Subject: Allocate a max viewport so that re-creating images isn't needed.

---
 3de.c    |  2 +-
 config.h |  6 ++++++
 plat.c   | 39 +++++++++++++++++----------------------
 3 files changed, 24 insertions(+), 23 deletions(-)

diff --git a/3de.c b/3de.c
index 8af3d18..fdfd7aa 100644
--- a/3de.c
+++ b/3de.c
@@ -68,7 +68,7 @@ int entrypoint(int argc, const char** argv, Arena* a) {
 	app = new_app(&h, 640, 480, "3D Engine");
 	if (!app) return app->err;
 	init_fps(&f, 20);
-	depth = heap_alloc(&h, 3000 * 3000 * sizeof *depth);
+	depth = heap_alloc(&h, max_vp_w * max_vp_h * sizeof *depth);
 	if (!depth) {
 		print_err("Out of memory.\n");
 		return error_out_of_memory;
diff --git a/config.h b/config.h
index 31e98f4..59554ee 100644
--- a/config.h
+++ b/config.h
@@ -4,4 +4,10 @@
 #define memory_size (1024 * 1024 * 128)
 #define app_memory_size (1024 * 1024 * 64)
 
+#define max_vp_w 2000
+#define max_vp_h 2000
+
+#define max_pc_window_w 5000
+#define max_pc_window_h 3000
+
 #endif
diff --git a/plat.c b/plat.c
index e0d72be..f0d60ba 100644
--- a/plat.c
+++ b/plat.c
@@ -1,5 +1,6 @@
 #include "config.h"
 #include "error.h"
+#include "maths.h"
 #include "memory.h"
 #include "plat.h"
 
@@ -184,16 +185,10 @@ void init_rendering(
 	XWindowAttributes* wa
 ) {
 	Colour* p, * fb;
-	int w = i->w = wa->width;
-	int h = i->h = wa->height;
-	int tw = (w + a->s) / a->s;
-	int th = (h + a->s) / a->s;
-	a->w = tw;
-	a->h = th;
-	if (i->bb) {
-		heap_free(a->heap, a->fb);
-		XDestroyImage(i->bb);
-	}
+	int w = max_pc_window_w;
+	int h = max_pc_window_h;
+	int tw = max_vp_w;
+	int th = max_vp_h;
 	p = malloc(sizeof *p * w * h);
 	fb = heap_alloc(a->heap, sizeof *p * tw * th);
 	if (!p || !fb) {
@@ -275,6 +270,10 @@ void init_window(App* a, App_Internal* i, const char* n) {
 		print_war("Detected BGR. Colours will look fucked.\n");
 	}
 	init_rendering(a, i, &wa);
+	a->w = (wa.width  + a->s) / a->s;
+	a->h = (wa.height + a->s) / a->s;
+	i->w = wa.width;
+	i->h = wa.height;
 }
 
 App* new_app(Heap* mem, int w, int h, const char* n) {
@@ -315,7 +314,6 @@ void app_begin(App* a) {
 	while (XPending(d)) {
 		XEvent e;
 		XWindowAttributes wa;
-		int nw, nh;
 		XNextEvent(d, &e);
 		switch (e.type) {
 			case ClientMessage:
@@ -328,15 +326,12 @@ void app_begin(App* a) {
 				break;
 			case Expose:
 				XGetWindowAttributes(d, w, &wa);
-				nw = wa.width;
-				nh = wa.height;
-				if (
-					!i->bb ||
-					nw != i->w ||
-					nh != i->h
-				) {
-					init_rendering(a, i, &wa);
-				}
+				a->w = (wa.width  + a->s) / a->s;
+				a->h = (wa.height + a->s) / a->s;
+				a->w = mini(a->w, max_vp_w);
+				a->h = mini(a->h, max_vp_w);
+				i->w = mini(wa.width,  max_pc_window_w);
+				i->h = mini(wa.height, max_pc_window_h);
 				break;
 			case MotionNotify:
 				a->mx = e.xmotion.x / a->s;
@@ -362,7 +357,7 @@ void app_rencpy(
 	int ix, iy, sw, sh, dw, dh;
 	int dsx, dsy;
 	int dex, dey;
-	int pidx, fbits = 9;
+	int pidx;
 	Colour* dst;
 	const Colour* src;
 	unsigned char t;
@@ -385,7 +380,7 @@ void app_rencpy(
 		for (ix = dsx; ix < dex; ix++) {
 			sx = (rat_x * (ix << fbits)) >> (fbits * 2);
 			pidx = sx + sy * sw;
-			dst = &i->bbp[ix + iy * dw];
+			dst = &i->bbp[ix + iy * max_pc_window_w];
 			*dst = src[pidx];
 			t = dst->r;
 			dst->r = dst->b;
-- 
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