add drawPoint/drawLine (both slow) and drawPoints (faster) to GLInstancingRenderer, with GLSL shaders

btgui/OpenGLWindow/Shaders/linesPS.glsl

@@ -0,0 +1,10 @@
+
+#version 150
+
+in vec4 colourV;
+out vec4 fragColour;
+
+void main(void)
+{
+    fragColour = colourV;
+}

btgui/OpenGLWindow/Shaders/linesPS.h

@@ -0,0 +1,10 @@
+//this file is autogenerated using stringify.bat (premake --stringify) in the build folder of this project
+static const char* linesFragmentShader= \
+"#version 150\n"
+"in vec4 colourV;\n"
+"out vec4 fragColour;\n"
+"void main(void)\n"
+"{\n"
+"    fragColour = colourV;\n"
+"}\n"
+;

btgui/OpenGLWindow/Shaders/linesVS.glsl

@@ -0,0 +1,17 @@
+#version 150   
+
+uniform mat4 ModelViewMatrix;
+uniform mat4 ProjectionMatrix;
+uniform vec4 colour;
+
+in vec4 position;
+
+
+out vec4 colourV;
+
+void main (void)
+{
+    colourV = colour;
+		gl_Position = ProjectionMatrix * ModelViewMatrix * position;
+		
+}

btgui/OpenGLWindow/Shaders/linesVS.h

@@ -0,0 +1,15 @@
+//this file is autogenerated using stringify.bat (premake --stringify) in the build folder of this project
+static const char* linesVertexShader= \
+"#version 150   \n"
+"uniform mat4 ModelViewMatrix;\n"
+"uniform mat4 ProjectionMatrix;\n"
+"uniform vec4 colour;\n"
+"in vec4 position;\n"
+"out vec4 colourV;\n"
+"void main (void)\n"
+"{\n"
+"    colourV = colour;\n"
+"		gl_Position = ProjectionMatrix * ModelViewMatrix * position;\n"
+"		\n"
+"}\n"
+;