const char * vs =
#ifdef EMSCRIPTEN
	"#version 300 es\n"
	"precision highp float;"
#else
	"#version 330 core\n"
#endif
	"layout (location = 0) in float aPos_x;"
	"layout (location = 1) in float aPos_y;"
	"layout (location = 2) in float aPos_z;"
	"layout (location = 3) in float aPos_w;"

	"layout (location = 4) in float aNormal_x;"
	"layout (location = 5) in float aNormal_y;"
	"layout (location = 6) in float aNormal_z;"
	"layout (location = 7) in float aNormal_w;"

	"uniform uint idx;"

	"uniform uint i;"
	"uniform float angle;"

	"uniform mat4 fix;"
	"uniform mat4 rot;"
	"uniform mat4 mdl;"

	"flat out uint index;"
	"out vec3 Normal;"
	"out vec3 FragPos;"

	"mat2 rotate2d( float angle )"
	"{"
		"return mat2( cos(angle), sin(angle), -sin(angle), cos(angle) );"
	"}"

	"void main()"
	"{"
	"	index=idx;"

	"	vec3 aNormal = vec3(aNormal_x,aNormal_y,aNormal_z);"
	"	vec3 aPos = vec3(aPos_x,aPos_y,aPos_z);"

	"	aNormal[i] = (vec2(aNormal_w, aNormal[i]) * rotate2d(angle))[0];"
	"	aPos[i] = (vec2(aPos_w, aPos[i]) * rotate2d(angle))[0];"

	"	Normal = mat3(transpose(inverse(rot*mdl))) * aNormal;"
	"	gl_Position = fix * rot * mdl * vec4( aPos, 1.0 );\n"
	"	FragPos = vec3( rot * mdl * vec4(aPos, 1.0));"
	"}";

	
const char * fs_plain =
#ifdef EMSCRIPTEN
	"#version 300 es\n"

	"precision highp float;"
	"precision highp sampler2DArray;"
#else
	"#version 330 core\n"
#endif
	"uniform sampler2DArray palette;"

	"flat in uint index;"
	"out vec4 FragColor;"
	"in vec3 Normal;"
	"in vec3 FragPos;"

	"void main()"
	"{"
	"	vec4 color = texture( palette, vec3(0,0,index)).rgba;"
	"	FragColor = vec4(pow(vec3(color),vec3(1.0/2.2)),color.a);"
	"}";

const char * fs =
#ifdef EMSCRIPTEN
    "#version 300 es\n"
	"precision highp float;"
	"precision highp sampler2DArray;"
#else
    "#version 330 core\n"
#endif

    "uniform sampler2DArray palette;"

    "flat in uint index;"
    "in vec3 Normal;"
    "in vec3 FragPos;"

    "out vec4 FragColor;"

    "void main()"
    "{"
    "   vec4 color = texture(palette, vec3(0, 0, index));\n"

    "   vec3 viewPos = vec3(0, 0, -15);\n"
    "   vec3 viewDir = normalize(viewPos - FragPos);\n"

    "   vec3 lightPos = viewPos;\n"
    "   vec3 lightDir = normalize(lightPos - FragPos);\n"

    "   vec3 halfwayDir = normalize(lightDir + viewDir);\n"

    "   float specular = pow(abs(dot(normalize(Normal), halfwayDir)), 32.0);\n"
    "   float diffuse = abs(dot(normalize(Normal), lightDir));\n"

    "   vec3 result = pow((0.5 + 0.5*diffuse + 1.5*specular) * color.rgb, vec3(1.0/2.2));\n"
    "   FragColor = vec4(result, color.a);\n"
    "}";