From 38499b2ceec400feaa657258458f859276f75d0c Mon Sep 17 00:00:00 2001
From: Lukas Krickl <lukas@krickl.dev>
Date: Tue, 24 Feb 2026 08:50:49 +0100
Subject: [PATCH] rendering: Added scaled rendering from frame buffer -> window

---
 src/lrts.c           | 16 ++++++++++++++++
 src/p_r_sdl/p_draw.c |  9 ++++++++-
 src/p_r_sdl/p_init.c |  8 ++++++--
 src/u_defs.h         |  6 ++++++
 4 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/src/lrts.c b/src/lrts.c
index 01149c0..193c2e0 100644
--- a/src/lrts.c
+++ b/src/lrts.c
@@ -44,6 +44,22 @@ struct u_vec2 lrts_get_render_res(void) {
 	return render_res;
 }
 
+#define U_SCREEN_W 1280
+#define U_SCREEN_H 720
+
+struct u_vec2 lrts_get_screen_res(void) {
+	struct lrts_config *cfg = lrts_cfg();
+
+	struct u_vec2 screen_res = cfg->screen_res;
+	if (screen_res.x == 0) {
+		screen_res.x = U_SCREEN_W;
+	}
+	if (screen_res.y == 0) {
+		screen_res.y = U_SCREEN_H;
+	}
+	return screen_res;
+}
+
 int lrts_main(int argc, char **argv) {
 	p_io_init();
   lrts_getopt(argc, argv, lrts_cfg());
diff --git a/src/p_r_sdl/p_draw.c b/src/p_r_sdl/p_draw.c
index c465e42..cf5416e 100644
--- a/src/p_r_sdl/p_draw.c
+++ b/src/p_r_sdl/p_draw.c
@@ -12,6 +12,13 @@ void p_draw_end(void) {
 
 void p_draw_present(void) {
 	SDL_Surface* screen = SDL_GetWindowSurface(p_main_window);
-	SDL_BlitSurface(r_target, NULL, screen, NULL);
+	SDL_Rect dst;
+
+	dst.x = 0;
+	dst.y = 0;
+	dst.w = screen->w;
+	dst.h = screen->h;
+
+	SDL_BlitSurfaceScaled(r_target, NULL, screen, &dst, SDL_SCALEMODE_PIXELART);
 	SDL_UpdateWindowSurface(p_main_window);
 }
diff --git a/src/p_r_sdl/p_init.c b/src/p_r_sdl/p_init.c
index 51de98d..41f2b13 100644
--- a/src/p_r_sdl/p_init.c
+++ b/src/p_r_sdl/p_init.c
@@ -7,9 +7,11 @@
 
 #include "p_window.c"
 
+#define DEFAULT_COLOR 0x222222FF
+
 int p_render_init(void) {
 	struct lrts_config *cfg = lrts_cfg();
-	struct u_vec2 target_res = lrts_get_render_res();
+	struct u_vec2 target_res = lrts_get_screen_res();
 
 	if (!SDL_Init(SDL_INIT_VIDEO)) {
 		u_log(U_LOG_ERR, "Failed to init video: %s\n", 
@@ -24,7 +26,7 @@ int p_render_init(void) {
 		exit(-1);
 	}
 
-
+	SDL_FillSurfaceRect(SDL_GetWindowSurface(p_main_window), NULL, DEFAULT_COLOR);
 	u_log(U_LOG_DEBUG, "Init successful\n");
 
 	return 0;
@@ -37,6 +39,8 @@ int p_render_init_framebuffer(void) {
 		u_log(U_LOG_ERR, "Failed to create surface: %s\n", SDL_GetError());
 		exit(-1);
 	}
+	
+	SDL_FillSurfaceRect(r_target, NULL, DEFAULT_COLOR);
 
 	r_framebuffer.pixels = r_target->pixels;
 	r_framebuffer.width = r_target->w;
diff --git a/src/u_defs.h b/src/u_defs.h
index f6f30fc..5207fb4 100644
--- a/src/u_defs.h
+++ b/src/u_defs.h
@@ -41,6 +41,7 @@ struct lrts_config {
 	const char *name;
 	
 	struct u_vec2 render_res;
+	struct u_vec2 screen_res;
 
 	char **argv;
 	int argc;
@@ -58,6 +59,11 @@ int lrts_main(int argc, char **argv);
  */
 struct u_vec2 lrts_get_render_res(void);
 
+/**
+ * Returns the screen resolution
+ */
+struct u_vec2 lrts_get_screen_res(void);
+
 
 #define LRTS_UNUSED(x) (void)(x)
 
-- 
2.30.2