glslViewer Shader: head

head.json

{
  "frag": "#version 100\n\n#ifdef GL_ES\nprecision mediump float;\n#endif\n\nuniform mat4        u_projectionMatrix;\n\nuniform vec3        u_camera;\nuniform float       u_cameraNearClip;\nuniform float       u_cameraFarClip;\n\nuniform vec3        u_light;\nuniform vec3        u_lightColor;\nuniform float       u_lightFalloff;\nuniform float       u_lightIntensity;\n\nuniform float       u_iblLuminance;\n\nuniform samplerCube u_cubeMap;\nuniform vec3        u_SH[9];\n\n#ifdef LIGHT_SHADOWMAP\nuniform sampler2D   u_lightShadowMap;\nuniform mat4        u_lightMatrix;\nvarying vec4        v_lightCoord;\n#endif\n\nuniform vec2        u_resolution;\nuniform float       u_time;\n\nvarying vec4        v_position;\nvarying vec4        v_color;\nvarying vec3        v_normal;\n\n#ifdef MODEL_VERTEX_TEXCOORD\nvarying vec2        v_texcoord;\n#endif\n\n#ifdef MODEL_VERTEX_TANGENT\nvarying vec4        v_tangent;\nvarying mat3        v_tangentToWorld;\n#endif\n\n#define SURFACE_POSITION    v_position\n#define CAMERA_POSITION     u_camera\n#define IBL_LUMINANCE       u_iblLuminance\n\n#define LIGHT_DIRECTION     u_light\n#define LIGHT_COLOR         u_lightColor\n#define LIGHT_FALLOFF       u_lightFalloff\n#define LIGHT_INTENSITY     u_lightIntensity\n#define LIGHT_COORD         v_lightCoord\n\n#include \"lygia/lighting/material/new.glsl\"\n#include \"lygia/lighting/pbr.glsl\"\n#include \"lygia/color/space/linear2gamma.glsl\"\n\nfloat checkBoard(vec2 uv, vec2 _scale) {\n    uv = floor(fract(uv * _scale) * 2.0);\n    return min(1.0, uv.x + uv.y) - (uv.x * uv.y);\n}\n\nvoid main(void) {\n    vec4 color = vec4(0.0, 0.0, 0.0, 1.0);\n    vec2 pixel = 1.0/u_resolution;\n    vec2 st = gl_FragCoord.xy * pixel;\n    \n#ifdef MODEL_PRIMITIVE_GSPLATS\n    float A = -dot(v_texcoord, v_texcoord);\n    \n    // Stricter clipping for finer edges\n    if (A < -4.0) discard;\n    \n    // Use smoother attenuation curve\n    float gaussian = exp(A);\n    \n    // Add edge smoothing to reduce aliasing\n    float edgeSmoothness = smoothstep(-4.0, -3.5, A);\n    float B = gaussian * v_color.a * edgeSmoothness;\n    \n    color.rgb = v_color.rgb;\n    color.a   = B;\n\n#else\n    Material material = materialNew();\n    material.albedo.rgb = vec3(0.);\n    \n    #if defined(FLOOR) && defined(MODEL_VERTEX_TEXCOORD)\n    material.albedo.rgb = vec3(0.5) + checkBoard(v_texcoord, vec2(18.0)) * 0.5;\n    #endif\n\n    color = pbr(material);\n    color = linear2gamma(color);\n#endif\n\n    gl_FragColor = color;\n}\n",
  "vert": "#version 100\n\n#ifdef GL_ES\nprecision mediump float;\n#endif\n\nuniform mat4        u_modelViewProjectionMatrix;\nuniform mat4        u_projectionMatrix;\nuniform mat4        u_modelMatrix;\nuniform mat4        u_viewMatrix;\nuniform mat3        u_normalMatrix;\nuniform vec2        u_resolution;\n\n#ifdef MODEL_PRIMITIVE_GSPLATS\nuniform sampler2D   u_GsplatData;\nuniform vec2        u_GsplatDataResolution; // Must be passed: vec2(4096.0, height)\n\nuniform vec2        u_focal;\n\nattribute vec2      a_position;\nattribute float     a_index;\n#else \n\nattribute vec4      a_position;\n#endif\n\nvarying vec4        v_position;\n\n#ifdef MODEL_VERTEX_COLOR\nattribute vec4      a_color;\nvarying vec4        v_color;\n#endif\n\n#ifdef MODEL_VERTEX_NORMAL\nattribute vec3      a_normal;\nvarying vec3        v_normal;\n#endif\n\n#ifdef MODEL_VERTEX_TEXCOORD\nattribute vec2      a_texcoord;\n#endif\nvarying vec2        v_texcoord;\n\n#ifdef MODEL_VERTEX_TANGENT\nattribute vec4      a_tangent;\nvarying vec4        v_tangent;\nvarying mat3        v_tangentToWorld;\n#endif\n\n#ifdef LIGHT_SHADOWMAP\nuniform mat4        u_lightMatrix;\nvarying vec4        v_lightCoord;\n#endif\n\n#include \"lygia/math/transpose.glsl\"\n#include \"lygia/math/toMat3.glsl\"\n\nvoid main(void) {\n\n#ifdef MODEL_PRIMITIVE_GSPLATS\n    v_texcoord = a_position;\n    v_color = vec4(v_texcoord.x, v_texcoord.y, 0.0, 1.0);\n\n    float width = u_GsplatDataResolution.x;\n    float height = u_GsplatDataResolution.y;\n\n    float fIndex = a_index;\n    float row = floor(fIndex / 1024.0);\n    float colStart = mod(fIndex, 1024.0) * 4.0;\n    \n    float v = (row + 0.5) / height;\n    \n    // p1: pos.xyz (position)\n    vec4 p1 = texture2D(u_GsplatData, vec2((colStart + 0.5) / width, v));\n    v_position = vec4(p1.xyz, 1.0);\n    \n    // Transform position to camera space\n    vec4 cam = u_viewMatrix * u_modelMatrix * v_position;\n    vec4 pos2d = u_projectionMatrix * cam;\n    \n    // Frustum culling\n    float clip = 1.2 * pos2d.w;\n    if (pos2d.z < -pos2d.w || pos2d.z > pos2d.w || \n        pos2d.x < -clip || pos2d.x > clip || \n        pos2d.y < -clip || pos2d.y > clip) {\n        gl_Position = vec4(0.0, 0.0, 2.0, 1.0);\n        return;\n    }\n        \n    // Covariance\n    // p2: cov.xx, cov.xy, cov.xz, cov.yy\n    // p3: cov.yz, cov.zz, 0, 0\n    vec4 p2 = texture2D(u_GsplatData, vec2((colStart + 1.5) / width, v));\n    vec4 p3 = texture2D(u_GsplatData, vec2((colStart + 2.5) / width, v));\n\n    // p4: color.rgba\n    vec4 p4 = texture2D(u_GsplatData, vec2((colStart + 3.5) / width, v));\n    v_color = p4;\n    \n    // Construct covariance matrix\n    mat3 Vrk = mat3(\n        p2.x, p2.y, p2.z,\n        p2.y, p2.w, p3.x,\n        p2.z, p3.x, p3.y\n    );\n    \n    // Compute 2D covariance\n    mat3 J = mat3(\n        u_focal.x / cam.z, 0.0, -(u_focal.x * cam.x) / (cam.z * cam.z),\n        0.0, u_focal.y / cam.z, -(u_focal.y * cam.y) / (cam.z * cam.z),\n        0.0, 0.0, 0.0\n    );\n    \n    mat3 T = transpose(toMat3(u_viewMatrix * u_modelMatrix)) * J;\n    mat3 cov2d = transpose(T) * Vrk * T;\n    \n    // Add low-pass filter (reduce value for finer splats)\n    cov2d[0][0] += 0.1;\n    cov2d[1][1] += 0.1;\n    \n    // Compute eigenvalues for ellipse\n    float mid = (cov2d[0][0] + cov2d[1][1]) / 2.0;\n    float radius = length(vec2((cov2d[0][0] - cov2d[1][1]) / 2.0, cov2d[0][1]));\n    float lambda1 = mid + radius;\n    float lambda2 = mid - radius;\n    \n    if (lambda2 < 0.0) {\n        gl_Position = vec4(0.0, 0.0, 2.0, 1.0);\n        return;\n    }\n    \n    vec2 diagonalVector = normalize(vec2(cov2d[0][1], lambda1 - cov2d[0][0]));\n\n    // Reduce scale for finer splat coverage\n    float scale = 2.5;\n    vec2 majorAxis = scale * min(sqrt(2.0 * lambda1), 1024.0) * diagonalVector;\n    vec2 minorAxis = scale * min(sqrt(2.0 * lambda2), 1024.0) * vec2(diagonalVector.y, -diagonalVector.x);\n    \n    // Compute final position\n    vec2 vCenter = vec2(pos2d) / pos2d.w;\n    vec2 pixel = 1.0 / u_resolution;\n    gl_Position = vec4(\n        vCenter + \n        a_position.x * majorAxis * pixel + \n        a_position.y * minorAxis * pixel,\n        pos2d.z / pos2d.w, 1.0\n    );\n\n#else\n    v_position = u_modelMatrix * a_position;\n    v_texcoord = a_position.xy * 0.5 + 0.5;\n    \n    #ifdef MODEL_VERTEX_COLOR\n    v_color = a_color;\n    #endif\n    \n    #ifdef MODEL_VERTEX_NORMAL\n    v_normal = vec4(u_modelMatrix * vec4(a_normal, 0.0) ).xyz;\n    #endif\n    \n    #ifdef MODEL_VERTEX_TEXCOORD\n    v_texcoord = a_texcoord;\n    #endif\n    \n    #ifdef MODEL_VERTEX_TANGENT\n    v_tangent = a_tangent;\n    vec3 worldTangent = a_tangent.xyz;\n    vec3 worldBiTangent = cross(v_normal, worldTangent);// * sign(a_tangent.w);\n    v_tangentToWorld = mat3(normalize(worldTangent), normalize(worldBiTangent), normalize(v_normal));\n    #endif\n    \n    gl_Position = u_projectionMatrix * u_viewMatrix * v_position;\n#endif\n\n#ifdef LIGHT_SHADOWMAP\n    v_lightCoord = u_lightMatrix * v_position;\n#endif\n}\n",
  "assets": {