improve torchlight

res/shaders/entity.glslv

@@ -38,7 +38,7 @@ void main() {
     a_realnormal = a_normal;
 
     vec3 light = v_light.rgb;
-    float torchlight = calc_torch_light(a_modelpos.xyz);
+    float torchlight = calc_torch_light(a_realnormal, a_modelpos.xyz);
     light += torchlight * u_torchlightColor;
     a_color = vec4(pow(light, vec3(u_gamma)),1.0f);
     a_texCoord = v_texCoord;

res/shaders/lib/lighting.glsl

@@ -7,8 +7,8 @@ uniform float u_weatherFogOpacity;
 uniform float u_weatherFogDencity;
 uniform float u_weatherFogCurve;
 
-float calc_torch_light(vec3 modelpos) {
+float calc_torch_light(vec3 normal, vec3 modelpos) {
-    return max(0.0, 1.0 - distance(u_cameraPos, modelpos.xyz) / u_torchlightDistance);
+    return max(0.0, 1.0 - distance(u_cameraPos, modelpos) / u_torchlightDistance) * -dot(normal, normalize(modelpos - u_cameraPos));
 }
 
 vec3 calc_screen_normal(vec3 normal) {

res/shaders/main.glslv

@@ -38,7 +38,7 @@ void main() {
     a_normal = calc_screen_normal(a_realnormal);
 
     vec3 light = v_light.rgb;
-    float torchlight = calc_torch_light(a_modelpos.xyz);
+    float torchlight = calc_torch_light(a_realnormal, a_modelpos.xyz);
     a_torchLight = vec4(pow(light + torchlight * u_torchlightColor, vec3(u_gamma)), 1.0f);
 
     a_texCoord = v_texCoord;