add initial examples, replacing the 'Demos/Demos3'. Will make it work cross-platform, OpenGL3/OpenGL2 and add more examples to it.

examples/OpenGLWindow/Shaders/useShadowMapInstancingPS.h

@@ -0,0 +1,49 @@
+//this file is autogenerated using stringify.bat (premake --stringify) in the build folder of this project
+static const char* useShadowMapInstancingFragmentShader= \
+"#version 330 core\n"
+"//precision highp float;\n"
+"in Fragment\n"
+"{\n"
+"     vec4 color;\n"
+"} fragment;\n"
+"in Vert\n"
+"{\n"
+"	vec2 texcoord;\n"
+"} vert;\n"
+"uniform sampler2D Diffuse;\n"
+"uniform sampler2DShadow shadowMap;\n"
+"in vec3 lightDir,normal,ambient;\n"
+"in vec4 ShadowCoord;\n"
+"out vec4 color;\n"
+"void main(void)\n"
+"{\n"
+"    vec4 texel = fragment.color*texture(Diffuse,vert.texcoord);//fragment.color;\n"
+"	vec3 ct,cf;\n"
+"	float intensity,at,af;\n"
+"	\n"
+"	intensity = clamp( dot( normalize(normal),lightDir ), 0,1 );\n"
+"	\n"
+"	cf = ambient;\n"
+"	af = 1.0;\n"
+"		\n"
+"	ct = texel.rgb;\n"
+"	at = texel.a;\n"
+"		\n"
+"	//float bias = 0.005f;\n"
+"	\n"
+"	float bias = 0.0001*tan(acos(intensity));\n"
+"	bias = clamp(bias, 0,0.01);\n"
+"	float visibility = texture(shadowMap, vec3(ShadowCoord.xy,(ShadowCoord.z-bias)/ShadowCoord.w));\n"
+"	\n"
+"	intensity*=2;\n"
+"	if (intensity>1)\n"
+"		intensity=1.f;\n"
+"	\n"
+"	visibility *= intensity;\n"
+"	\n"
+"	if (visibility<0.6)\n"
+"		visibility=0.6f;\n"
+"		\n"
+"	color  = vec4(ct * visibility, fragment.color.w);\n"
+"}\n"
+;