Implement alpha cutoff for materials

[libs/gl.git] / source / materials / material.cpp

diff --git a/source/materials/material.cpp b/source/materials/material.cpp
index a34c0457384025f2af87f91ed45fac78dd042835..6af833e6b5c30e48badcfd6bec78d45bce64eeee 100644 (file)
--- a/source/materials/material.cpp
+++ b/source/materials/material.cpp
@@ -11,10 +11,18 @@ using namespace std;
 namespace Msp {
 namespace GL {
 
+Material::Material()
+{
+       set_alpha_cutoff(0.0f);
+}
+
 const Program *Material::create_compatible_shader(const map<string, int> &extra_spec) const
 {
        string module_name;
        map<string, int> spec_values;
+       if(alpha_cutoff>0.0f)
+               spec_values["use_alpha_cutoff"] = true;
+
        fill_program_info(module_name, spec_values);
 
        for(const auto &kvp: extra_spec)
@@ -48,6 +56,12 @@ const Program *Material::create_compatible_shader(const map<string, int> &extra_
        return shprog;
 }
 
+void Material::set_alpha_cutoff(float a)
+{
+       alpha_cutoff = a;
+       shdata.uniform("alpha_cutoff", a);
+}
+
 void Material::set_debug_name(const string &name)
 {
 #ifdef DEBUG
@@ -78,9 +92,15 @@ Material::Loader::Loader(Material &m, Collection &c):
 
 void Material::Loader::init_actions()
 {
+       add("alpha_cutoff", &Loader::alpha_cutoff);
        add("sampler", &Loader::sampler);
 }
 
+void Material::Loader::alpha_cutoff(float a)
+{
+       obj.set_alpha_cutoff(a);
+}
+
 void Material::Loader::sampler(const string &name)
 {
        obj.sampler = &get_collection().get<Sampler>(name);