Small GLSL fixes

Author: jonathanhogg

src/flitter/render/window/glsl/backface_lighting.frag

@@ -70,7 +70,7 @@ void main() {
             light_distance = length(L);
             if (light_radius > 0.0) {
                 attenuation = clamp(1.0 - (light_radius / light_distance), 0.0, 1.0);
-                light_distance = max(0.0, light_distance - light_radius*0.99);
+                light_distance -= min(light_radius, light_distance*0.99);
             }
             L = normalize(L);
         } else if (light_type == ${Spot}) {

src/flitter/render/window/glsl/standard_lighting.vert

@@ -21,8 +21,8 @@ flat out vec4 fragment_properties;
 uniform mat4 pv_matrix;
 
 void main() {
-    world_position = (model_matrix * vec4(model_position, 1)).xyz;
-    gl_Position = pv_matrix * vec4(world_position, 1);
+    world_position = (model_matrix * vec4(model_position, 1.0)).xyz;
+    gl_Position = pv_matrix * vec4(world_position, 1.0);
     world_normal = model_normal_matrix * model_normal;
     texture_uv = model_uv;
     fragment_albedo = material_albedo;