Add Vec2ShaderParameter class for vec2 glsl type

src/celengine/glshader.cpp

@@ -87,6 +87,24 @@ FloatShaderParameter::operator=(float f)
 }
 
 
+Vec2ShaderParameter::Vec2ShaderParameter() :
+    slot(-1)
+{
+}
+
+Vec2ShaderParameter::Vec2ShaderParameter(GLuint obj, const char* name)
+{
+    slot = glGetUniformLocation(obj, name);
+}
+
+Vec2ShaderParameter&
+Vec2ShaderParameter::operator=(const Eigen::Vector2f& v)
+{
+    if (slot != -1)
+        glUniform2fv(slot, 1, v.data());
+    return *this;
+}
+
 Vec3ShaderParameter::Vec3ShaderParameter() :
     slot(-1)
 {

src/celengine/glshader.h

@@ -98,6 +98,18 @@ class FloatShaderParameter
 };
 
 
+class Vec2ShaderParameter
+{
+ public:
+    Vec2ShaderParameter();
+    Vec2ShaderParameter(GLuint obj, const char* name);
+
+    Vec2ShaderParameter& operator=(const Eigen::Vector2f&);
+
+ private:
+    int slot;
+};
+
 class Vec3ShaderParameter
 {
  public:

src/celengine/shadermanager.cpp

@@ -3495,6 +3495,12 @@ CelestiaGLProgram::samplerParam(const string& paramName)
 }
 
 
+Vec2ShaderParameter
+CelestiaGLProgram::vec2Param(const string& paramName)
+{
+    return Vec2ShaderParameter(program->getID(), paramName.c_str());
+}
+
 Vec3ShaderParameter
 CelestiaGLProgram::vec3Param(const string& paramName)
 {

src/celengine/shadermanager.h

@@ -278,6 +278,7 @@ class CelestiaGLProgram
     FloatShaderParameter floatParam(const std::string&);
     IntegerShaderParameter intParam(const std::string&);
     IntegerShaderParameter samplerParam(const std::string&);
+    Vec2ShaderParameter vec2Param(const std::string&);
     Vec3ShaderParameter vec3Param(const std::string&);
     Vec4ShaderParameter vec4Param(const std::string&);
     Mat3ShaderParameter mat3Param(const std::string&);