Implement alpha cutoff for materials

[libs/gl.git] / shaderlib / cooktorrance.glsl

diff --git a/shaderlib/cooktorrance.glsl b/shaderlib/cooktorrance.glsl
index ff1a56c7c237e240ebd7cb4c69df8a7ce24a36ba..ad1a459d2e32932d9cb79a0501fb339b5ad6b7ba 100644 (file)
--- a/shaderlib/cooktorrance.glsl
+++ b/shaderlib/cooktorrance.glsl
@@ -13,6 +13,7 @@ struct PbrMaterialParameters
 uniform PbrMaterial
 {
        PbrMaterialParameters pbr_material;
+       float alpha_cutoff;
 };
 
 uniform sampler2D base_color_map;
@@ -29,6 +30,7 @@ layout(constant_id=auto) const bool use_occlusion_map = false;
 layout(constant_id=auto) const bool use_emission = false;
 layout(constant_id=auto) const bool use_emission_map = false;
 layout(constant_id=auto) const bool use_image_based_lighting = false;
+layout(constant_id=auto) const bool use_alpha_cutoff = false;
 
 #pragma MSP stage(fragment)
 virtual vec4 get_base_color()
@@ -173,10 +175,13 @@ vec3 cooktorrance_lighting(vec3 normal, vec3 look, vec3 base_color, float metaln
 
 void main()
 {
+       vec4 base_color = get_base_color();
+       if(use_alpha_cutoff && base_color.a<alpha_cutoff)
+               discard;
+
        vec3 normal = get_fragment_normal();
        vec3 look = normalize(world_look_dir);
 
-       vec4 base_color = get_base_color();
        float metalness = get_metalness_value();
        float roughness = get_roughness_value();