カスタムシェーダー（フレネル反射＋バンプマッピング）
attribute vec3 position;
attribute vec3 normal;
attribute vec2 texcoord;
attribute vec3 tangent;
attribute vec3 binormal;
uniform vec3 light0_Direction;
uniform mat4 normalMatrix;
uniform mat4 modelViewMatrix;
uniform mat4 modelViewMatrixInverse;
uniform mat4 modelViewProjectionMatrix;
varying vec2 fragTexCoord;
varying vec3 fragEye;
varying vec3 fragNormal;
varying vec3 fragNormal2;
varying vec3 fragTangent;
varying vec3 fragBinormal;
varying vec3 fragLight;
void main()
{
vec4 eye = vec4(modelViewMatrixInverse * vec4(0.0, 0.0, 0.0, 1.0));
fragEye = position - eye.xyz;
fragNormal = normal;
fragTangent = tangent;
fragBinormal = binormal;
fragLight = light0_Direction;
fragNormal2 = (normalMatrix * vec4(normal, 0.0)).xyz;
fragTexCoord = vec2(texcoord.x, 1.0 - texcoord.y);
gl_Position = modelViewProjectionMatrix * vec4(position, 1.0);
}
#ifdef GL_ES
precision highp float;
#endif
uniform float eta;
uniform float bias;
uniform float scale;
uniform float power;
uniform float specpower;
uniform sampler2D tex;
uniform samplerCube cube;
uniform sampler2D bump;
varying vec2 fragTexCoord;
varying vec3 fragEye;
varying vec3 fragNormal;
varying vec3 fragTangent;
varying vec3 fragBinormal;
varying vec3 fragLight;
varying vec3 fragNormal2;
void main()
{
vec3 eye = normalize(fragEye);
vec3 normal = normalize(fragNormal);
vec3 tangent = normalize(fragTangent);
vec3 binormal = normalize(fragBinormal);
//バンプマッピング
vec4 texCol = texture2D(tex, fragTexCoord);
vec3 bumpCol = texture2D(bump, fragTexCoord).rgb;
vec3 tsn = 2.0 * (normalize(bumpCol) - 0.5);
tsn = tsn.z * normal + tsn.y * tangent + tsn.x * binormal;
normal = -normalize(tsn);
float p = max(0.1, dot(normal, eye));
texCol.rgb *= p;
texCol.rgb += max(0.0, pow(p, 128.0)) * vec3(0.8);
//フレネル反射
//入射，反射，屈折ベクトルの計算
vec3 N = -normalize(tsn); //法線ベクトル
vec3 I = eye; //入射ベクトル
vec3 R = reflect(I, N); //反射ベクトル
vec3 T = refract(I, N, eta); //屈折ベクトル
//反射因数の計算
float fresnel = bias + scale*pow(1.0 - abs(dot(I, N)), power);
//float fresnel = bias + scale * pow(1.0 - max(0.0, dot(I, N)), power);
//反射環境色の取得
vec4 reflecColor = textureCube(cube, R);
reflecColor = reflecColor * vec4(1.333);
reflecColor.a = 1.0;
//屈折環境色の計算
vec4 refracColor;
refracColor = textureCube(cube, T);
refracColor.a = 1.0;
//ディフューズ反射
//スペキュラー反射
vec3 IS = normalize((normalize(fragLight) + eye) / 2.0); //入射ベクトル
vec3 ID = normalize(fragLight); //入射ベクトル
vec3 NS = normalize(fragNormal2); //法線ベクトル
float spec = pow(max(0.0, dot(-IS, NS)), specpower);
float diff = max(0.0, dot(-ID, NS));
vec3 col = diff * vec3(0.6);
col += spec * vec3(1.0);
//vec3 col = spec * vec3(1.0);
vec4 lgtCol = vec4(col, 1.0);
//色を統合
vec4 cubeCol = refracColor+fresnel*(reflecColor - refracColor);
cubeCol.a = fresnel * 0.5 + 0.5;
cubeCol = clamp(cubeCol, 0.0, 1.0);
//gl_FragColor = cubeCol;
//gl_FragColor = reflecColor;
//gl_FragColor = refracColor;
//gl_FragColor = lgtCol;
gl_FragColor = mix(cubeCol, lgtCol, 0.4);
gl_FragColor = mix(gl_FragColor, texCol, 0.5);
}
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