add transparency possibility (using black color( 0.0,0.0,0.0) in simpleColor and perVertexColor

usage: constructor with true parameter

include/Utils/Shaders/shaderColorPerVertex.frag

@@ -5,5 +5,9 @@ VARYING_FRAG vec3 color;
 FRAG_OUT_DEF;
 void main()
 {
+#ifdef BLACK_TRANSPARENCY
+	if (dot(color,color) == 0.0)
+		discard;
+#endif
 	gl_FragColor=vec4(color,0.0);
 }

include/Utils/Shaders/shaderColorPerVertex.h

@@ -48,7 +48,7 @@ protected:
     void restoreUniformsAttribs();
 
 public:
-    ShaderColorPerVertex();
+    ShaderColorPerVertex(bool black_is_transparent = false);
 
 	unsigned int setAttributePosition(VBO* vbo);
 

include/Utils/Shaders/shaderFlatColorPerFace.geom

@@ -7,7 +7,6 @@ uniform vec3 lightPosition;
 uniform vec4 ambient;
 
 VARYING_IN vec3 colorVertex[];
-
 VARYING_OUT vec4 ColorFS;
 
 void main(void)

include/Utils/Shaders/shaderSimpleColor.frag

@@ -5,5 +5,9 @@ uniform vec4 color;
 FRAG_OUT_DEF;
 void main()
 {
+#ifdef BLACK_TRANSPARENCY
+	if (dot(color,color) == 0.0)
+		discard;
+#endif
 	gl_FragColor=color;
 }

include/Utils/Shaders/shaderSimpleColor.h

@@ -52,7 +52,7 @@ protected:
 	void restoreUniformsAttribs();
 
 public:
-	ShaderSimpleColor();
+	ShaderSimpleColor(bool back_is_transparent = false);
 
 	void setColor(const Geom::Vec4f& color);
 

src/Utils/Shaders/shaderColorPerVertex.cpp

@@ -58,7 +58,7 @@ namespace Utils
 //		"}";
 
 
-ShaderColorPerVertex::ShaderColorPerVertex()
+ShaderColorPerVertex::ShaderColorPerVertex(bool black_is_transparent)
 {
 	m_nameVS = "ShaderColorPerVertex_vs";
 	m_nameFS = "ShaderColorPerVertex_fs";
@@ -68,6 +68,8 @@ ShaderColorPerVertex::ShaderColorPerVertex()
 	glxvert.append(vertexShaderText);
 
 	std::string glxfrag(*GLSLShader::DEFINES_GL);
+	if (black_is_transparent)
+		glxfrag.append("#define BLACK_TRANSPARENCY 1\n");
 	glxfrag.append(fragmentShaderText);
 
 	loadShadersFromMemory(glxvert.c_str(), glxfrag.c_str());

src/Utils/Shaders/shaderSimpleColor.cpp

@@ -54,7 +54,7 @@ namespace Utils
 //		"}";
 
 
-ShaderSimpleColor::ShaderSimpleColor()
+ShaderSimpleColor::ShaderSimpleColor(bool black_is_transparent)
 {
 	m_nameVS = "ShaderSimpleColor_vs";
 	m_nameFS = "ShaderSimpleColor_fs";
@@ -66,6 +66,8 @@ ShaderSimpleColor::ShaderSimpleColor()
 	glxvert.append(vertexShaderText);
 
 	std::string glxfrag(*GLSLShader::DEFINES_GL);
+	if (black_is_transparent)
+		glxfrag.append("#define BLACK_TRANSPARENCY 1\n");
 	glxfrag.append(fragmentShaderText);
 
 	loadShadersFromMemory(glxvert.c_str(), glxfrag.c_str());