From: Lukas Krickl <lukas@krickl.dev>
Date: Thu, 26 Feb 2026 05:43:53 +0000 (+0100)
Subject: render: Added basic template fallback tile for isometric tile drawing.
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=8463987f79dfb18d5825fcdc4d72eb264d645353;p=lrts%2F.git

render: Added basic template fallback tile for isometric tile drawing.

This tile is a mask for drawing a solid color tile.
---

diff --git a/src/r_assets.c b/src/r_assets.c
index 0dd87ba..63ec5e2 100644
--- a/src/r_assets.c
+++ b/src/r_assets.c
@@ -2,10 +2,38 @@
 #include "r_render.h"
 #include "u_mem.h"
 
-i32 r_asset_fallback_tile[R_TILE_W * R_TILE_H];
+r_color r_asset_fallback_tile[R_TILE_W * R_TILE_H];
 
 void r_asset_init_fallback_tile(void) {
+	int i = 0;
+	int j = 0;
+	r_color *row = NULL;
 	u_memset(r_asset_fallback_tile, 0, R_TILE_W * R_TILE_H);
+	
+	/* top row */
+	for (i = 0; i < 8; i++) {
+		row = r_asset_fallback_tile+i*R_TILE_W + R_TILE_W-1;
+
+		/* get start */
+		row -= 14-2*i;
+		
+		for (j = 0; j < 4 * (i + 1); j++) {
+			*(row-j) = 0xFFFFFFFF; 
+		}
+	}
+
+	/* bottom row */
+	for (i = 0; i < 8; i++) {
+		row = r_asset_fallback_tile+R_TILE_W*(R_TILE_H-1-i)-1;
+
+		/* get start */
+		row -= 14-2*i;
+
+		for (j = 0; j < 4 * (i + 1); j++) {
+			*(row-j) = 0xFFFFFFFF;
+		}
+	}
+
 }
 
 void r_draw_solid_isometric_tile(i32 x, i32 y, r_color color) {
@@ -15,9 +43,6 @@ void r_draw_solid_isometric_tile(i32 x, i32 y, r_color color) {
 	struct u_vec2 t = u_tile_to_screen(x, y);
 
 	/* converted origin point in isometric space */
-
-	LRTS_UNUSED(x);
-	LRTS_UNUSED(y);
 	
 	/* draw a tile texture from origin */
 	for (i = 0; i < R_TILE_W; i++) {
diff --git a/src/r_render.c b/src/r_render.c
index b8a7455..0e07d0c 100644
--- a/src/r_render.c
+++ b/src/r_render.c
@@ -8,6 +8,10 @@ struct r_framebuffer r_framebuffer;
 
 void r_draw_pixel(struct r_framebuffer *fb, i32 x, i32 y, r_color color) {
 	r_target_color *pixel = LRTS_NULL;
+	/* if alpha is all 0 do nothing */
+	if ((color & 0xFF) == 0) {
+		return;
+	}
 
 	/* drop the draw if out of bounds */
 	if (x < 0 || x >= r_target->w) {
@@ -22,13 +26,19 @@ void r_draw_pixel(struct r_framebuffer *fb, i32 x, i32 y, r_color color) {
 }
 
 void r_render_frame() {
+	int i, j;
 	struct t_tile t;
 
 	p_draw_begin();
 	
 	/* draw test tile */
 	t.type = T_TILE_TYPE_GRASS;
-	r_draw_tile(&t, 0, 0);
+
+	for (i = 0; i < 16; i++) {
+		for (j = 0; j < 16; j++) {
+			r_draw_tile(&t, i, j);
+		}
+	}
 
 	p_draw_end();
 	p_draw_present();