Tune mipmaps and alpha clip threshold

main.c

@@ -790,7 +790,7 @@ sg_image load_image(MD_String8 path)
 			.height = png_height,
 			.pixel_format = SG_PIXELFORMAT_RGBA8,
 			.min_filter = SG_FILTER_LINEAR,
-			.num_mipmaps = 0,
+			.num_mipmaps = 1,
 			.wrap_u = SG_WRAP_CLAMP_TO_EDGE,
 			.wrap_v = SG_WRAP_CLAMP_TO_EDGE,
 			.mag_filter = SG_FILTER_LINEAR,

threedee.glsl

@@ -219,7 +219,7 @@ float calculate_shadow_factor(sampler2D shadowMap, vec4 light_space_fragment_pos
 
 void main() {
 	vec4 col = texture(tex, uv);
-	if(col.a < 0.5)
+	if(col.a < 0.1)
 	{
 		discard;
 	}