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headlessCanvas.js
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function headlessCanvas() {
return {
headless: true,
getContext: function(which) {
switch(which) {
case 'experimental-webgl': {
return {
/* ClearBufferMask */
DEPTH_BUFFER_BIT : 0x00000100,
STENCIL_BUFFER_BIT : 0x00000400,
COLOR_BUFFER_BIT : 0x00004000,
/* BeginMode */
POINTS : 0x0000,
LINES : 0x0001,
LINE_LOOP : 0x0002,
LINE_STRIP : 0x0003,
TRIANGLES : 0x0004,
TRIANGLE_STRIP : 0x0005,
TRIANGLE_FAN : 0x0006,
/* AlphaFunction (not supported in ES20) */
/* NEVER */
/* LESS */
/* EQUAL */
/* LEQUAL */
/* GREATER */
/* NOTEQUAL */
/* GEQUAL */
/* ALWAYS */
/* BlendingFactorDest */
ZERO : 0,
ONE : 1,
SRC_COLOR : 0x0300,
ONE_MINUS_SRC_COLOR : 0x0301,
SRC_ALPHA : 0x0302,
ONE_MINUS_SRC_ALPHA : 0x0303,
DST_ALPHA : 0x0304,
ONE_MINUS_DST_ALPHA : 0x0305,
/* BlendingFactorSrc */
/* ZERO */
/* ONE */
DST_COLOR : 0x0306,
ONE_MINUS_DST_COLOR : 0x0307,
SRC_ALPHA_SATURATE : 0x0308,
/* SRC_ALPHA */
/* ONE_MINUS_SRC_ALPHA */
/* DST_ALPHA */
/* ONE_MINUS_DST_ALPHA */
/* BlendEquationSeparate */
FUNC_ADD : 0x8006,
BLEND_EQUATION : 0x8009,
BLEND_EQUATION_RGB : 0x8009, /* same as BLEND_EQUATION */
BLEND_EQUATION_ALPHA : 0x883D,
/* BlendSubtract */
FUNC_SUBTRACT : 0x800A,
FUNC_REVERSE_SUBTRACT : 0x800B,
/* Separate Blend Functions */
BLEND_DST_RGB : 0x80C8,
BLEND_SRC_RGB : 0x80C9,
BLEND_DST_ALPHA : 0x80CA,
BLEND_SRC_ALPHA : 0x80CB,
CONSTANT_COLOR : 0x8001,
ONE_MINUS_CONSTANT_COLOR : 0x8002,
CONSTANT_ALPHA : 0x8003,
ONE_MINUS_CONSTANT_ALPHA : 0x8004,
BLEND_COLOR : 0x8005,
/* Buffer Objects */
ARRAY_BUFFER : 0x8892,
ELEMENT_ARRAY_BUFFER : 0x8893,
ARRAY_BUFFER_BINDING : 0x8894,
ELEMENT_ARRAY_BUFFER_BINDING : 0x8895,
STREAM_DRAW : 0x88E0,
STATIC_DRAW : 0x88E4,
DYNAMIC_DRAW : 0x88E8,
BUFFER_SIZE : 0x8764,
BUFFER_USAGE : 0x8765,
CURRENT_VERTEX_ATTRIB : 0x8626,
/* CullFaceMode */
FRONT : 0x0404,
BACK : 0x0405,
FRONT_AND_BACK : 0x0408,
/* DepthFunction */
/* NEVER */
/* LESS */
/* EQUAL */
/* LEQUAL */
/* GREATER */
/* NOTEQUAL */
/* GEQUAL */
/* ALWAYS */
/* EnableCap */
/* TEXTURE_2D */
CULL_FACE : 0x0B44,
BLEND : 0x0BE2,
DITHER : 0x0BD0,
STENCIL_TEST : 0x0B90,
DEPTH_TEST : 0x0B71,
SCISSOR_TEST : 0x0C11,
POLYGON_OFFSET_FILL : 0x8037,
SAMPLE_ALPHA_TO_COVERAGE : 0x809E,
SAMPLE_COVERAGE : 0x80A0,
/* ErrorCode */
NO_ERROR : 0,
INVALID_ENUM : 0x0500,
INVALID_VALUE : 0x0501,
INVALID_OPERATION : 0x0502,
OUT_OF_MEMORY : 0x0505,
/* FrontFaceDirection */
CW : 0x0900,
CCW : 0x0901,
/* GetPName */
LINE_WIDTH : 0x0B21,
ALIASED_POINT_SIZE_RANGE : 0x846D,
ALIASED_LINE_WIDTH_RANGE : 0x846E,
CULL_FACE_MODE : 0x0B45,
FRONT_FACE : 0x0B46,
DEPTH_RANGE : 0x0B70,
DEPTH_WRITEMASK : 0x0B72,
DEPTH_CLEAR_VALUE : 0x0B73,
DEPTH_FUNC : 0x0B74,
STENCIL_CLEAR_VALUE : 0x0B91,
STENCIL_FUNC : 0x0B92,
STENCIL_FAIL : 0x0B94,
STENCIL_PASS_DEPTH_FAIL : 0x0B95,
STENCIL_PASS_DEPTH_PASS : 0x0B96,
STENCIL_REF : 0x0B97,
STENCIL_VALUE_MASK : 0x0B93,
STENCIL_WRITEMASK : 0x0B98,
STENCIL_BACK_FUNC : 0x8800,
STENCIL_BACK_FAIL : 0x8801,
STENCIL_BACK_PASS_DEPTH_FAIL : 0x8802,
STENCIL_BACK_PASS_DEPTH_PASS : 0x8803,
STENCIL_BACK_REF : 0x8CA3,
STENCIL_BACK_VALUE_MASK : 0x8CA4,
STENCIL_BACK_WRITEMASK : 0x8CA5,
VIEWPORT : 0x0BA2,
SCISSOR_BOX : 0x0C10,
/* SCISSOR_TEST */
COLOR_CLEAR_VALUE : 0x0C22,
COLOR_WRITEMASK : 0x0C23,
UNPACK_ALIGNMENT : 0x0CF5,
PACK_ALIGNMENT : 0x0D05,
MAX_TEXTURE_SIZE : 0x0D33,
MAX_VIEWPORT_DIMS : 0x0D3A,
SUBPIXEL_BITS : 0x0D50,
RED_BITS : 0x0D52,
GREEN_BITS : 0x0D53,
BLUE_BITS : 0x0D54,
ALPHA_BITS : 0x0D55,
DEPTH_BITS : 0x0D56,
STENCIL_BITS : 0x0D57,
POLYGON_OFFSET_UNITS : 0x2A00,
/* POLYGON_OFFSET_FILL */
POLYGON_OFFSET_FACTOR : 0x8038,
TEXTURE_BINDING_2D : 0x8069,
SAMPLE_BUFFERS : 0x80A8,
SAMPLES : 0x80A9,
SAMPLE_COVERAGE_VALUE : 0x80AA,
SAMPLE_COVERAGE_INVERT : 0x80AB,
/* GetTextureParameter */
/* TEXTURE_MAG_FILTER */
/* TEXTURE_MIN_FILTER */
/* TEXTURE_WRAP_S */
/* TEXTURE_WRAP_T */
COMPRESSED_TEXTURE_FORMATS : 0x86A3,
/* HintMode */
DONT_CARE : 0x1100,
FASTEST : 0x1101,
NICEST : 0x1102,
/* HintTarget */
GENERATE_MIPMAP_HINT : 0x8192,
/* DataType */
BYTE : 0x1400,
UNSIGNED_BYTE : 0x1401,
SHORT : 0x1402,
UNSIGNED_SHORT : 0x1403,
INT : 0x1404,
UNSIGNED_INT : 0x1405,
FLOAT : 0x1406,
/* PixelFormat */
DEPTH_COMPONENT : 0x1902,
ALPHA : 0x1906,
RGB : 0x1907,
RGBA : 0x1908,
LUMINANCE : 0x1909,
LUMINANCE_ALPHA : 0x190A,
/* PixelType */
/* UNSIGNED_BYTE */
UNSIGNED_SHORT_4_4_4_4 : 0x8033,
UNSIGNED_SHORT_5_5_5_1 : 0x8034,
UNSIGNED_SHORT_5_6_5 : 0x8363,
/* Shaders */
FRAGMENT_SHADER : 0x8B30,
VERTEX_SHADER : 0x8B31,
MAX_VERTEX_ATTRIBS : 0x8869,
MAX_VERTEX_UNIFORM_VECTORS : 0x8DFB,
MAX_VARYING_VECTORS : 0x8DFC,
MAX_COMBINED_TEXTURE_IMAGE_UNITS : 0x8B4D,
MAX_VERTEX_TEXTURE_IMAGE_UNITS : 0x8B4C,
MAX_TEXTURE_IMAGE_UNITS : 0x8872,
MAX_FRAGMENT_UNIFORM_VECTORS : 0x8DFD,
SHADER_TYPE : 0x8B4F,
DELETE_STATUS : 0x8B80,
LINK_STATUS : 0x8B82,
VALIDATE_STATUS : 0x8B83,
ATTACHED_SHADERS : 0x8B85,
ACTIVE_UNIFORMS : 0x8B86,
ACTIVE_ATTRIBUTES : 0x8B89,
SHADING_LANGUAGE_VERSION : 0x8B8C,
CURRENT_PROGRAM : 0x8B8D,
/* StencilFunction */
NEVER : 0x0200,
LESS : 0x0201,
EQUAL : 0x0202,
LEQUAL : 0x0203,
GREATER : 0x0204,
NOTEQUAL : 0x0205,
GEQUAL : 0x0206,
ALWAYS : 0x0207,
/* StencilOp */
/* ZERO */
KEEP : 0x1E00,
REPLACE : 0x1E01,
INCR : 0x1E02,
DECR : 0x1E03,
INVERT : 0x150A,
INCR_WRAP : 0x8507,
DECR_WRAP : 0x8508,
/* StringName */
VENDOR : 0x1F00,
RENDERER : 0x1F01,
VERSION : 0x1F02,
/* TextureMagFilter */
NEAREST : 0x2600,
LINEAR : 0x2601,
/* TextureMinFilter */
/* NEAREST */
/* LINEAR */
NEAREST_MIPMAP_NEAREST : 0x2700,
LINEAR_MIPMAP_NEAREST : 0x2701,
NEAREST_MIPMAP_LINEAR : 0x2702,
LINEAR_MIPMAP_LINEAR : 0x2703,
/* TextureParameterName */
TEXTURE_MAG_FILTER : 0x2800,
TEXTURE_MIN_FILTER : 0x2801,
TEXTURE_WRAP_S : 0x2802,
TEXTURE_WRAP_T : 0x2803,
/* TextureTarget */
TEXTURE_2D : 0x0DE1,
TEXTURE : 0x1702,
TEXTURE_CUBE_MAP : 0x8513,
TEXTURE_BINDING_CUBE_MAP : 0x8514,
TEXTURE_CUBE_MAP_POSITIVE_X : 0x8515,
TEXTURE_CUBE_MAP_NEGATIVE_X : 0x8516,
TEXTURE_CUBE_MAP_POSITIVE_Y : 0x8517,
TEXTURE_CUBE_MAP_NEGATIVE_Y : 0x8518,
TEXTURE_CUBE_MAP_POSITIVE_Z : 0x8519,
TEXTURE_CUBE_MAP_NEGATIVE_Z : 0x851A,
MAX_CUBE_MAP_TEXTURE_SIZE : 0x851C,
/* TextureUnit */
TEXTURE0 : 0x84C0,
TEXTURE1 : 0x84C1,
TEXTURE2 : 0x84C2,
TEXTURE3 : 0x84C3,
TEXTURE4 : 0x84C4,
TEXTURE5 : 0x84C5,
TEXTURE6 : 0x84C6,
TEXTURE7 : 0x84C7,
TEXTURE8 : 0x84C8,
TEXTURE9 : 0x84C9,
TEXTURE10 : 0x84CA,
TEXTURE11 : 0x84CB,
TEXTURE12 : 0x84CC,
TEXTURE13 : 0x84CD,
TEXTURE14 : 0x84CE,
TEXTURE15 : 0x84CF,
TEXTURE16 : 0x84D0,
TEXTURE17 : 0x84D1,
TEXTURE18 : 0x84D2,
TEXTURE19 : 0x84D3,
TEXTURE20 : 0x84D4,
TEXTURE21 : 0x84D5,
TEXTURE22 : 0x84D6,
TEXTURE23 : 0x84D7,
TEXTURE24 : 0x84D8,
TEXTURE25 : 0x84D9,
TEXTURE26 : 0x84DA,
TEXTURE27 : 0x84DB,
TEXTURE28 : 0x84DC,
TEXTURE29 : 0x84DD,
TEXTURE30 : 0x84DE,
TEXTURE31 : 0x84DF,
ACTIVE_TEXTURE : 0x84E0,
/* TextureWrapMode */
REPEAT : 0x2901,
CLAMP_TO_EDGE : 0x812F,
MIRRORED_REPEAT : 0x8370,
/* Uniform Types */
FLOAT_VEC2 : 0x8B50,
FLOAT_VEC3 : 0x8B51,
FLOAT_VEC4 : 0x8B52,
INT_VEC2 : 0x8B53,
INT_VEC3 : 0x8B54,
INT_VEC4 : 0x8B55,
BOOL : 0x8B56,
BOOL_VEC2 : 0x8B57,
BOOL_VEC3 : 0x8B58,
BOOL_VEC4 : 0x8B59,
FLOAT_MAT2 : 0x8B5A,
FLOAT_MAT3 : 0x8B5B,
FLOAT_MAT4 : 0x8B5C,
SAMPLER_2D : 0x8B5E,
SAMPLER_CUBE : 0x8B60,
/* Vertex Arrays */
VERTEX_ATTRIB_ARRAY_ENABLED : 0x8622,
VERTEX_ATTRIB_ARRAY_SIZE : 0x8623,
VERTEX_ATTRIB_ARRAY_STRIDE : 0x8624,
VERTEX_ATTRIB_ARRAY_TYPE : 0x8625,
VERTEX_ATTRIB_ARRAY_NORMALIZED : 0x886A,
VERTEX_ATTRIB_ARRAY_POINTER : 0x8645,
VERTEX_ATTRIB_ARRAY_BUFFER_BINDING : 0x889F,
/* Shader Source */
COMPILE_STATUS : 0x8B81,
/* Shader Precision-Specified Types */
LOW_FLOAT : 0x8DF0,
MEDIUM_FLOAT : 0x8DF1,
HIGH_FLOAT : 0x8DF2,
LOW_INT : 0x8DF3,
MEDIUM_INT : 0x8DF4,
HIGH_INT : 0x8DF5,
/* Framebuffer Object. */
FRAMEBUFFER : 0x8D40,
RENDERBUFFER : 0x8D41,
RGBA4 : 0x8056,
RGB5_A1 : 0x8057,
RGB565 : 0x8D62,
DEPTH_COMPONENT16 : 0x81A5,
STENCIL_INDEX : 0x1901,
STENCIL_INDEX8 : 0x8D48,
DEPTH_STENCIL : 0x84F9,
RENDERBUFFER_WIDTH : 0x8D42,
RENDERBUFFER_HEIGHT : 0x8D43,
RENDERBUFFER_INTERNAL_FORMAT : 0x8D44,
RENDERBUFFER_RED_SIZE : 0x8D50,
RENDERBUFFER_GREEN_SIZE : 0x8D51,
RENDERBUFFER_BLUE_SIZE : 0x8D52,
RENDERBUFFER_ALPHA_SIZE : 0x8D53,
RENDERBUFFER_DEPTH_SIZE : 0x8D54,
RENDERBUFFER_STENCIL_SIZE : 0x8D55,
FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE : 0x8CD0,
FRAMEBUFFER_ATTACHMENT_OBJECT_NAME : 0x8CD1,
FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL : 0x8CD2,
FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE : 0x8CD3,
COLOR_ATTACHMENT0 : 0x8CE0,
DEPTH_ATTACHMENT : 0x8D00,
STENCIL_ATTACHMENT : 0x8D20,
DEPTH_STENCIL_ATTACHMENT : 0x821A,
NONE : 0,
FRAMEBUFFER_COMPLETE : 0x8CD5,
FRAMEBUFFER_INCOMPLETE_ATTACHMENT : 0x8CD6,
FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT : 0x8CD7,
FRAMEBUFFER_INCOMPLETE_DIMENSIONS : 0x8CD9,
FRAMEBUFFER_UNSUPPORTED : 0x8CDD,
FRAMEBUFFER_BINDING : 0x8CA6,
RENDERBUFFER_BINDING : 0x8CA7,
MAX_RENDERBUFFER_SIZE : 0x84E8,
INVALID_FRAMEBUFFER_OPERATION : 0x0506,
/* WebGL-specific enums */
UNPACK_FLIP_Y_WEBGL : 0x9240,
UNPACK_PREMULTIPLY_ALPHA_WEBGL : 0x9241,
CONTEXT_LOST_WEBGL : 0x9242,
UNPACK_COLORSPACE_CONVERSION_WEBGL : 0x9243,
BROWSER_DEFAULT_WEBGL : 0x9244,
items: {},
id: 0,
getExtension: function() { return 1 },
createBuffer: function() {
var id = this.id++;
this.items[id] = {
which: 'buffer',
};
return id;
},
deleteBuffer: function(){},
bindBuffer: function(){},
bufferData: function(){},
getParameter: function(pname) {
switch(pname) {
case /* GL_VENDOR */ 0x1F00: return 'FakeShellGLVendor';
case /* GL_RENDERER */ 0x1F01: return 'FakeShellGLRenderer';
case /* GL_VERSION */ 0x1F02: return '0.0.1';
case /* GL_MAX_TEXTURE_SIZE */ 0x0D33: return 16384;
case /* GL_MAX_CUBE_MAP_TEXTURE_SIZE */ 0x851C: return 16384;
case /* GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT */ 0x84FF: return 16;
case /* GL_MAX_TEXTURE_IMAGE_UNITS_NV */ 0x8872: return 16;
case /* GL_MAX_VERTEX_UNIFORM_VECTORS */ 0x8DFB: return 4096;
case /* GL_MAX_FRAGMENT_UNIFORM_VECTORS */ 0x8DFD: return 4096;
case /* GL_MAX_VARYING_VECTORS */ 0x8DFC: return 32;
case /* GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS */ 0x8B4D: return 32;
case /* GL_ARRAY_BUFFER_BINDING */ 0x8894: return 0;
default: console.log('getParameter ' + pname + '?'); return 0;
}
},
getSupportedExtensions: function() {
return ["OES_texture_float", "OES_standard_derivatives", "EXT_texture_filter_anisotropic", "MOZ_EXT_texture_filter_anisotropic", "MOZ_WEBGL_lose_context", "MOZ_WEBGL_compressed_texture_s3tc", "MOZ_WEBGL_depth_texture"];
},
createShader: function(type) {
var id = this.id++;
this.items[id] = {
which: 'shader',
type: type,
};
return id;
},
getShaderParameter: function(shader, pname) {
switch(pname) {
case /* GL_SHADER_TYPE */ 0x8B4F: return this.items[shader].type;
case /* GL_COMPILE_STATUS */ 0x8B81: return true;
default: throw 'getShaderParameter ' + pname;
}
},
shaderSource: function(){},
compileShader: function(){},
createProgram: function() {
var id = this.id++;
this.items[id] = {
which: 'program',
shaders: [],
};
return id;
},
attachShader: function(program, shader) {
this.items[program].shaders.push(shader);
},
bindAttribLocation: function(){},
linkProgram: function(){},
getProgramParameter: function(program, pname) {
switch(pname) {
case /* LINK_STATUS */ 0x8B82: return true;
case /* ACTIVE_UNIFORMS */ 0x8B86: return 4;
default: throw 'getProgramParameter ' + pname;
}
},
deleteShader: function(){},
deleteProgram: function(){},
viewport: function(){},
clearColor: function(){},
clearDepth: function(){},
depthFunc: function(){},
enable: function(){},
disable: function(){},
frontFace: function(){},
cullFace: function(){},
activeTexture: function(){},
createTexture: function() {
var id = this.id++;
this.items[id] = {
which: 'texture',
};
return id;
},
deleteTexture: function(){},
boundTextures: {},
bindTexture: function(target, texture) {
this.boundTextures[target] = texture;
},
texParameteri: function(){},
pixelStorei: function(){},
texImage2D: function(){},
compressedTexImage2D: function(){},
useProgram: function(){},
getUniformLocation: function() {
return null;
},
getActiveUniform: function(program, index) {
return {
size: 1,
type: /* INT_VEC3 */ 0x8B54,
name: 'activeUniform' + index,
};
},
clear: function(){},
uniform4fv: function(){},
uniform1i: function(){},
getAttribLocation: function() { return 1 },
vertexAttribPointer: function(){},
enableVertexAttribArray: function(){},
disableVertexAttribArray: function(){},
drawElements: function(){},
drawArrays: function(){},
depthMask: function(){},
depthRange: function(){},
bufferSubData: function(){},
blendFunc: function(){},
createFramebuffer: function() {
var id = this.id++;
this.items[id] = {
which: 'framebuffer',
shaders: [],
};
return id;
},
bindFramebuffer: function(){},
framebufferTexture2D: function(){},
checkFramebufferStatus: function() {
return /* FRAMEBUFFER_COMPLETE */ 0x8CD5;
},
createRenderbuffer: function() {
var id = this.id++;
this.items[id] = {
which: 'renderbuffer',
shaders: [],
};
return id;
},
bindRenderbuffer: function(){},
renderbufferStorage: function(){},
framebufferRenderbuffer: function(){},
scissor: function(){},
colorMask: function(){},
lineWidth: function(){},
vertexAttrib4fv: function(){},
};
}
case '2d': {
return {
drawImage: function(){},
getImageData: function(x, y, w, h) {
return {
width: w,
height: h,
data: new Uint8ClampedArray(w*h),
};
},
save: function(){},
restore: function(){},
fillRect: function(){},
measureText: function() { return 10 },
fillText: function(){},
};
}
default: throw 'canvas.getContext: ' + which;
}
},
requestPointerLock: function() {
document.pointerLockElement = document.getElementById('canvas');
window.setTimeout(function() {
document.callEventListeners('pointerlockchange');
});
},
exitPointerLock: function(){},
style: {
setProperty: function(){}
},
eventListeners: {},
addEventListener: function(){},
removeEventListener: function(){},
requestFullScreen: function() {
document.fullscreenElement = document.getElementById('canvas');
window.setTimeout(function() {
document.callEventListeners('fullscreenchange');
});
},
offsetTop: 0,
offsetLeft: 0,
// generics
classList: {
add: function(){},
remove: function(){},
},
};
}