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library_webgl.js
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/**
* @license
* Copyright 2010 The Emscripten Authors
* SPDX-License-Identifier: MIT
*/
// Specifies the size of the GL temp buffer pool, in bytes. Must be a multiple
// of 9 and 16.
{{{ GL_POOL_TEMP_BUFFERS_SIZE = 2*9*16 }}} // = 288
{{{
global.isCurrentContextWebGL2 = function isCurrentContextWebGL2() {
if (MIN_WEBGL_VERSION >= 2) return 'true';
if (MAX_WEBGL_VERSION <= 1) return 'false';
return 'GL.currentContext.version >= 2';
}
}}}
var LibraryGL = {
// For functions such as glDrawBuffers, glInvalidateFramebuffer and glInvalidateSubFramebuffer that need to pass a short array to the WebGL API,
// create a set of short fixed-length arrays to avoid having to generate any garbage when calling those functions.
$tempFixedLengthArray__postset: 'for (var i = 0; i < 32; ++i) tempFixedLengthArray.push(new Array(i));',
$tempFixedLengthArray: [],
$miniTempWebGLFloatBuffers: [],
$miniTempWebGLFloatBuffers__postset:
'var miniTempWebGLFloatBuffersStorage = new Float32Array(' + {{{ GL_POOL_TEMP_BUFFERS_SIZE }}} + ');\n'
+ 'for (/**@suppress{duplicate}*/var i = 0; i < ' + {{{ GL_POOL_TEMP_BUFFERS_SIZE }}} + '; ++i) {\n'
+ 'miniTempWebGLFloatBuffers[i] = miniTempWebGLFloatBuffersStorage.subarray(0, i+1);\n'
+ '}\n',
_miniTempWebGLIntBuffers: [],
_miniTempWebGLIntBuffers__postset:
'var __miniTempWebGLIntBuffersStorage = new Int32Array(' + {{{ GL_POOL_TEMP_BUFFERS_SIZE }}} + ');\n'
+ 'for (/**@suppress{duplicate}*/var i = 0; i < ' + {{{ GL_POOL_TEMP_BUFFERS_SIZE }}} + '; ++i) {\n'
+ '__miniTempWebGLIntBuffers[i] = __miniTempWebGLIntBuffersStorage.subarray(0, i+1);\n'
+ '}\n',
$heapObjectForWebGLType: function(type) {
// Micro-optimization for size: Subtract lowest GL enum number (0x1400/* GL_BYTE */) from type to compare
// smaller values for the heap, for shorter generated code size.
// Also the type HEAPU16 is not tested for explicitly, but any unrecognized type will return out HEAPU16.
// (since most types are HEAPU16)
type -= 0x1400;
#if MAX_WEBGL_VERSION >= 2
if (type == {{{ 0x1400 - 0x1400/* GL_BYTE */ }}}) return HEAP8;
#endif
if (type == {{{ 0x1401 - 0x1400/* GL_UNSIGNED_BYTE */ }}}) return HEAPU8;
#if MAX_WEBGL_VERSION >= 2
if (type == {{{ 0x1402 - 0x1400/* GL_SHORT */ }}}) return HEAP16;
#endif
if (type == {{{ 0x1404 - 0x1400/* GL_INT */ }}}) return HEAP32;
if (type == {{{ 0x1406 - 0x1400/* GL_FLOAT */ }}}) return HEAPF32;
if (type == {{{ 0x1405 - 0x1400 /* GL_UNSIGNED_INT */ }}}
|| type == {{{ 0x84FA - 0x1400 /* GL_UNSIGNED_INT_24_8_WEBGL/GL_UNSIGNED_INT_24_8 */ }}}
#if MAX_WEBGL_VERSION >= 2
|| type == {{{ 0x8368 - 0x1400 /* GL_UNSIGNED_INT_2_10_10_10_REV */ }}}
|| type == {{{ 0x8C3B - 0x1400 /* GL_UNSIGNED_INT_10F_11F_11F_REV */ }}}
|| type == {{{ 0x8C3E - 0x1400 /* GL_UNSIGNED_INT_5_9_9_9_REV */ }}}
#endif
)
return HEAPU32;
#if GL_ASSERTIONS
if (type != {{{ 0x1403 - 0x1400 /* GL_UNSIGNED_SHORT */ }}}
#if MAX_WEBGL_VERSION >= 2
&& type != {{{ 0x140B - 0x1400 /* GL_HALF_FLOAT */ }}}
#endif
&& type != {{{ 0x8033 - 0x1400 /* GL_UNSIGNED_SHORT_4_4_4_4 */ }}}
&& type != {{{ 0x8034 - 0x1400 /* GL_UNSIGNED_SHORT_5_5_5_1 */ }}}
&& type != {{{ 0x8363 - 0x1400 /* GL_UNSIGNED_SHORT_5_6_5 */ }}}
&& type != {{{ 0x8D61 - 0x1400 /* GL_HALF_FLOAT_OES */ }}}) {
err('Invalid WebGL type 0x' + (type+0x1400).toString() + ' passed to $heapObjectForWebGLType!');
}
#endif
return HEAPU16;
},
$heapAccessShiftForWebGLHeap: function(heap) {
return 31 - Math.clz32(heap.BYTES_PER_ELEMENT);
},
#if MIN_WEBGL_VERSION == 1
_webgl_enable_ANGLE_instanced_arrays: function(ctx) {
// Extension available in WebGL 1 from Firefox 26 and Google Chrome 30 onwards. Core feature in WebGL 2.
var ext = ctx.getExtension('ANGLE_instanced_arrays');
if (ext) {
ctx['vertexAttribDivisor'] = function(index, divisor) { ext['vertexAttribDivisorANGLE'](index, divisor); };
ctx['drawArraysInstanced'] = function(mode, first, count, primcount) { ext['drawArraysInstancedANGLE'](mode, first, count, primcount); };
ctx['drawElementsInstanced'] = function(mode, count, type, indices, primcount) { ext['drawElementsInstancedANGLE'](mode, count, type, indices, primcount); };
return 1;
}
},
emscripten_webgl_enable_ANGLE_instanced_arrays__deps: ['_webgl_enable_ANGLE_instanced_arrays'],
emscripten_webgl_enable_ANGLE_instanced_arrays: function(ctx) {
return __webgl_enable_ANGLE_instanced_arrays(GL.contexts[ctx].GLctx);
},
_webgl_enable_OES_vertex_array_object: function(ctx) {
// Extension available in WebGL 1 from Firefox 25 and WebKit 536.28/desktop Safari 6.0.3 onwards. Core feature in WebGL 2.
var ext = ctx.getExtension('OES_vertex_array_object');
if (ext) {
ctx['createVertexArray'] = function() { return ext['createVertexArrayOES'](); };
ctx['deleteVertexArray'] = function(vao) { ext['deleteVertexArrayOES'](vao); };
ctx['bindVertexArray'] = function(vao) { ext['bindVertexArrayOES'](vao); };
ctx['isVertexArray'] = function(vao) { return ext['isVertexArrayOES'](vao); };
return 1;
}
},
emscripten_webgl_enable_OES_vertex_array_object__deps: ['_webgl_enable_OES_vertex_array_object'],
emscripten_webgl_enable_OES_vertex_array_object: function(ctx) {
return __webgl_enable_OES_vertex_array_object(GL.contexts[ctx].GLctx);
},
_webgl_enable_WEBGL_draw_buffers: function(ctx) {
// Extension available in WebGL 1 from Firefox 28 onwards. Core feature in WebGL 2.
var ext = ctx.getExtension('WEBGL_draw_buffers');
if (ext) {
ctx['drawBuffers'] = function(n, bufs) { ext['drawBuffersWEBGL'](n, bufs); };
return 1;
}
},
emscripten_webgl_enable_WEBGL_draw_buffers__deps: ['_webgl_enable_WEBGL_draw_buffers'],
emscripten_webgl_enable_WEBGL_draw_buffers: function(ctx) {
return __webgl_enable_WEBGL_draw_buffers(GL.contexts[ctx].GLctx);
},
#endif
_webgl_enable_WEBGL_multi_draw: function(ctx) {
// Closure is expected to be allowed to minify the '.multiDrawWebgl' property, so not accessing it quoted.
return !!(ctx.multiDrawWebgl = ctx.getExtension('WEBGL_multi_draw'));
},
emscripten_webgl_enable_WEBGL_multi_draw__deps: ['_webgl_enable_WEBGL_multi_draw'],
emscripten_webgl_enable_WEBGL_multi_draw: function(ctx) {
return __webgl_enable_WEBGL_multi_draw(GL.contexts[ctx].GLctx);
},
$GL__postset: 'var GLctx;',
#if GL_SUPPORT_AUTOMATIC_ENABLE_EXTENSIONS
// If GL_SUPPORT_AUTOMATIC_ENABLE_EXTENSIONS is enabled, GL.initExtensions() will call to initialize these.
$GL__deps: [
#if MIN_WEBGL_VERSION == 1
'_webgl_enable_ANGLE_instanced_arrays',
'_webgl_enable_OES_vertex_array_object',
'_webgl_enable_WEBGL_draw_buffers',
#endif
#if MAX_WEBGL_VERSION >= 2
'_webgl_enable_WEBGL_draw_instanced_base_vertex_base_instance',
'_webgl_enable_WEBGL_multi_draw_instanced_base_vertex_base_instance',
#endif
'_webgl_enable_WEBGL_multi_draw',
],
#endif
$GL: {
#if GL_DEBUG
debug: true,
#endif
/* We do not depend on the exact initial values of falsey member fields - these fields can be populated on-demand
to save code size.
(but still documented here to keep track of what is supposed to be present)
#if GL_TRACK_ERRORS
lastError: 0,
#endif
currentContext: null,
#if FULL_ES2 || LEGACY_GL_EMULATION
currArrayBuffer: 0,
currElementArrayBuffer: 0,
#endif
*/
counter: 1, // 0 is reserved as 'null' in gl
buffers: [],
#if FULL_ES3
mappedBuffers: {},
#endif
programs: [],
framebuffers: [],
renderbuffers: [],
textures: [],
uniforms: [],
shaders: [],
vaos: [],
#if USE_PTHREADS // with pthreads a context is a location in memory with some synchronized data between threads
contexts: {},
#else // without pthreads, it's just an integer ID
contexts: [],
#endif
offscreenCanvases: {}, // DOM ID -> OffscreenCanvas mappings of <canvas> elements that have their rendering control transferred to offscreen.
timerQueriesEXT: [],
#if MAX_WEBGL_VERSION >= 2
queries: [],
samplers: [],
transformFeedbacks: [],
syncs: [],
#endif
#if FULL_ES2 || LEGACY_GL_EMULATION
byteSizeByTypeRoot: 0x1400, // GL_BYTE
byteSizeByType: [
1, // GL_BYTE
1, // GL_UNSIGNED_BYTE
2, // GL_SHORT
2, // GL_UNSIGNED_SHORT
4, // GL_INT
4, // GL_UNSIGNED_INT
4, // GL_FLOAT
2, // GL_2_BYTES
3, // GL_3_BYTES
4, // GL_4_BYTES
8 // GL_DOUBLE
],
#endif
programInfos: {}, // Stores additional information needed for each shader program. Each entry is of form:
/* { uniforms: {}, // Maps ints back to the opaque WebGLUniformLocation objects.
maxUniformLength: int, // Cached in order to implement glGetProgramiv(GL_ACTIVE_UNIFORM_MAX_LENGTH)
maxAttributeLength: int // Cached in order to implement glGetProgramiv(GL_ACTIVE_ATTRIBUTE_MAX_LENGTH)
maxUniformBlockNameLength: int // Cached in order to implement glGetProgramiv(GL_ACTIVE_UNIFORM_BLOCK_MAX_NAME_LENGTH)
} */
stringCache: {},
#if MAX_WEBGL_VERSION >= 2
stringiCache: {},
#endif
unpackAlignment: 4, // default alignment is 4 bytes
// Records a GL error condition that occurred, stored until user calls glGetError() to fetch it. As per GLES2 spec, only the first error
// is remembered, and subsequent errors are discarded until the user has cleared the stored error by a call to glGetError().
recordError: function recordError(errorCode) {
#if GL_TRACK_ERRORS
if (!GL.lastError) {
GL.lastError = errorCode;
}
#endif
},
// Get a new ID for a texture/buffer/etc., while keeping the table dense and fast. Creation is fairly rare so it is worth optimizing lookups later.
getNewId: function(table) {
var ret = GL.counter++;
for (var i = table.length; i < ret; i++) {
table[i] = null;
}
return ret;
},
#if FULL_ES2 || LEGACY_GL_EMULATION
// When user GL code wants to render from client-side memory, we need to upload the vertex data to a temp VBO
// for rendering. Maintain a set of temp VBOs that are created-on-demand to appropriate sizes, and never destroyed.
// Also, for best performance the VBOs are double-buffered, i.e. every second frame we switch the set of VBOs we
// upload to, so that rendering from the previous frame is not disturbed by uploading from new data to it, which
// could cause a GPU-CPU pipeline stall.
// Note that index buffers are not double-buffered (at the moment) in this manner.
MAX_TEMP_BUFFER_SIZE: {{{ GL_MAX_TEMP_BUFFER_SIZE }}},
// Maximum number of temp VBOs of one size to maintain, after that we start reusing old ones, which is safe but can give
// a performance impact. If CPU-GPU stalls are a problem, increasing this might help.
numTempVertexBuffersPerSize: 64, // (const)
// Precompute a lookup table for the function ceil(log2(x)), i.e. how many bits are needed to represent x, or,
// if x was rounded up to next pow2, which index is the single '1' bit at?
// Then log2ceilLookup[x] returns ceil(log2(x)).
log2ceilLookup: function(i) {
return 32 - Math.clz32(i-1);
},
generateTempBuffers: function(quads, context) {
var largestIndex = GL.log2ceilLookup(GL.MAX_TEMP_BUFFER_SIZE);
context.tempVertexBufferCounters1 = [];
context.tempVertexBufferCounters2 = [];
context.tempVertexBufferCounters1.length = context.tempVertexBufferCounters2.length = largestIndex+1;
context.tempVertexBuffers1 = [];
context.tempVertexBuffers2 = [];
context.tempVertexBuffers1.length = context.tempVertexBuffers2.length = largestIndex+1;
context.tempIndexBuffers = [];
context.tempIndexBuffers.length = largestIndex+1;
for (var i = 0; i <= largestIndex; ++i) {
context.tempIndexBuffers[i] = null; // Created on-demand
context.tempVertexBufferCounters1[i] = context.tempVertexBufferCounters2[i] = 0;
var ringbufferLength = GL.numTempVertexBuffersPerSize;
context.tempVertexBuffers1[i] = [];
context.tempVertexBuffers2[i] = [];
var ringbuffer1 = context.tempVertexBuffers1[i];
var ringbuffer2 = context.tempVertexBuffers2[i];
ringbuffer1.length = ringbuffer2.length = ringbufferLength;
for (var j = 0; j < ringbufferLength; ++j) {
ringbuffer1[j] = ringbuffer2[j] = null; // Created on-demand
}
}
if (quads) {
// GL_QUAD indexes can be precalculated
context.tempQuadIndexBuffer = GLctx.createBuffer();
context.GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, context.tempQuadIndexBuffer);
var numIndexes = GL.MAX_TEMP_BUFFER_SIZE >> 1;
var quadIndexes = new Uint16Array(numIndexes);
var i = 0, v = 0;
while (1) {
quadIndexes[i++] = v;
if (i >= numIndexes) break;
quadIndexes[i++] = v+1;
if (i >= numIndexes) break;
quadIndexes[i++] = v+2;
if (i >= numIndexes) break;
quadIndexes[i++] = v;
if (i >= numIndexes) break;
quadIndexes[i++] = v+2;
if (i >= numIndexes) break;
quadIndexes[i++] = v+3;
if (i >= numIndexes) break;
v += 4;
}
context.GLctx.bufferData(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, quadIndexes, 0x88E4 /*GL_STATIC_DRAW*/);
context.GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, null);
}
},
getTempVertexBuffer: function getTempVertexBuffer(sizeBytes) {
var idx = GL.log2ceilLookup(sizeBytes);
var ringbuffer = GL.currentContext.tempVertexBuffers1[idx];
var nextFreeBufferIndex = GL.currentContext.tempVertexBufferCounters1[idx];
GL.currentContext.tempVertexBufferCounters1[idx] = (GL.currentContext.tempVertexBufferCounters1[idx]+1) & (GL.numTempVertexBuffersPerSize-1);
var vbo = ringbuffer[nextFreeBufferIndex];
if (vbo) {
return vbo;
}
var prevVBO = GLctx.getParameter(0x8894 /*GL_ARRAY_BUFFER_BINDING*/);
ringbuffer[nextFreeBufferIndex] = GLctx.createBuffer();
GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, ringbuffer[nextFreeBufferIndex]);
GLctx.bufferData(0x8892 /*GL_ARRAY_BUFFER*/, 1 << idx, 0x88E8 /*GL_DYNAMIC_DRAW*/);
GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, prevVBO);
return ringbuffer[nextFreeBufferIndex];
},
getTempIndexBuffer: function getTempIndexBuffer(sizeBytes) {
var idx = GL.log2ceilLookup(sizeBytes);
var ibo = GL.currentContext.tempIndexBuffers[idx];
if (ibo) {
return ibo;
}
var prevIBO = GLctx.getParameter(0x8895 /*ELEMENT_ARRAY_BUFFER_BINDING*/);
GL.currentContext.tempIndexBuffers[idx] = GLctx.createBuffer();
GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, GL.currentContext.tempIndexBuffers[idx]);
GLctx.bufferData(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, 1 << idx, 0x88E8 /*GL_DYNAMIC_DRAW*/);
GLctx.bindBuffer(0x8893 /*GL_ELEMENT_ARRAY_BUFFER*/, prevIBO);
return GL.currentContext.tempIndexBuffers[idx];
},
// Called at start of each new WebGL rendering frame. This swaps the doublebuffered temp VB memory pointers,
// so that every second frame utilizes different set of temp buffers. The aim is to keep the set of buffers
// being rendered, and the set of buffers being updated disjoint.
newRenderingFrameStarted: function newRenderingFrameStarted() {
if (!GL.currentContext) {
return;
}
var vb = GL.currentContext.tempVertexBuffers1;
GL.currentContext.tempVertexBuffers1 = GL.currentContext.tempVertexBuffers2;
GL.currentContext.tempVertexBuffers2 = vb;
vb = GL.currentContext.tempVertexBufferCounters1;
GL.currentContext.tempVertexBufferCounters1 = GL.currentContext.tempVertexBufferCounters2;
GL.currentContext.tempVertexBufferCounters2 = vb;
var largestIndex = GL.log2ceilLookup(GL.MAX_TEMP_BUFFER_SIZE);
for (var i = 0; i <= largestIndex; ++i) {
GL.currentContext.tempVertexBufferCounters1[i] = 0;
}
},
#endif
getSource: function(shader, count, string, length) {
var source = '';
for (var i = 0; i < count; ++i) {
var len = length ? {{{ makeGetValue('length', 'i*4', 'i32') }}} : -1;
source += UTF8ToString({{{ makeGetValue('string', 'i*4', 'i32') }}}, len < 0 ? undefined : len);
}
#if LEGACY_GL_EMULATION
// Let's see if we need to enable the standard derivatives extension
var type = GLctx.getShaderParameter(GL.shaders[shader], 0x8B4F /* GL_SHADER_TYPE */);
if (type == 0x8B30 /* GL_FRAGMENT_SHADER */) {
if (GLEmulation.findToken(source, "dFdx") ||
GLEmulation.findToken(source, "dFdy") ||
GLEmulation.findToken(source, "fwidth")) {
source = "#extension GL_OES_standard_derivatives : enable\n" + source;
var extension = GLctx.getExtension("OES_standard_derivatives");
#if GL_DEBUG
if (!extension) {
err("Shader attempts to use the standard derivatives extension which is not available.");
}
#endif
}
}
#endif
return source;
},
#if GL_FFP_ONLY
enabledClientAttribIndices: [],
enableVertexAttribArray: function enableVertexAttribArray(index) {
if (!GL.enabledClientAttribIndices[index]) {
GL.enabledClientAttribIndices[index] = true;
GLctx.enableVertexAttribArray(index);
}
},
disableVertexAttribArray: function disableVertexAttribArray(index) {
if (GL.enabledClientAttribIndices[index]) {
GL.enabledClientAttribIndices[index] = false;
GLctx.disableVertexAttribArray(index);
}
},
#endif
#if FULL_ES2
calcBufLength: function calcBufLength(size, type, stride, count) {
if (stride > 0) {
return count * stride; // XXXvlad this is not exactly correct I don't think
}
var typeSize = GL.byteSizeByType[type - GL.byteSizeByTypeRoot];
return size * typeSize * count;
},
usedTempBuffers: [],
preDrawHandleClientVertexAttribBindings: function preDrawHandleClientVertexAttribBindings(count) {
GL.resetBufferBinding = false;
// TODO: initial pass to detect ranges we need to upload, might not need an upload per attrib
for (var i = 0; i < GL.currentContext.maxVertexAttribs; ++i) {
var cb = GL.currentContext.clientBuffers[i];
if (!cb.clientside || !cb.enabled) continue;
GL.resetBufferBinding = true;
var size = GL.calcBufLength(cb.size, cb.type, cb.stride, count);
var buf = GL.getTempVertexBuffer(size);
GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, buf);
GLctx.bufferSubData(0x8892 /*GL_ARRAY_BUFFER*/,
0,
HEAPU8.subarray(cb.ptr, cb.ptr + size));
#if GL_ASSERTIONS
GL.validateVertexAttribPointer(cb.size, cb.type, cb.stride, 0);
#endif
cb.vertexAttribPointerAdaptor.call(GLctx, i, cb.size, cb.type, cb.normalized, cb.stride, 0);
}
},
postDrawHandleClientVertexAttribBindings: function postDrawHandleClientVertexAttribBindings() {
if (GL.resetBufferBinding) {
GLctx.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, GL.buffers[GLctx.currentArrayBufferBinding]);
}
},
#endif
#if GL_ASSERTIONS
validateGLObjectID: function(objectHandleArray, objectID, callerFunctionName, objectReadableType) {
if (objectID != 0) {
if (objectHandleArray[objectID] === null) {
console.error(callerFunctionName + ' called with an already deleted ' + objectReadableType + ' ID ' + objectID + '!');
} else if (!objectHandleArray[objectID]) {
console.error(callerFunctionName + ' called with an invalid ' + objectReadableType + ' ID ' + objectID + '!');
}
}
},
// Validates that user obeys GL spec #6.4: http://www.khronos.org/registry/webgl/specs/latest/1.0/#6.4
validateVertexAttribPointer: function(dimension, dataType, stride, offset) {
var sizeBytes = 1;
switch(dataType) {
case 0x1400 /* GL_BYTE */:
case 0x1401 /* GL_UNSIGNED_BYTE */:
sizeBytes = 1;
break;
case 0x1402 /* GL_SHORT */:
case 0x1403 /* GL_UNSIGNED_SHORT */:
sizeBytes = 2;
break;
case 0x1404 /* GL_INT */:
case 0x1405 /* GL_UNSIGNED_INT */:
case 0x1406 /* GL_FLOAT */:
sizeBytes = 4;
break;
case 0x140A /* GL_DOUBLE */:
sizeBytes = 8;
break;
default:
#if MAX_WEBGL_VERSION >= 2
if ({{{ isCurrentContextWebGL2() }}}) {
if (dataType == 0x8368 /* GL_UNSIGNED_INT_2_10_10_10_REV */ || dataType == 0x8D9F /* GL_INT_2_10_10_10_REV */) {
sizeBytes = 4;
break;
} else if (dataType == 0x140B /* GL_HALF_FLOAT */) {
sizeBytes = 2;
break;
} else {
// else fall through
}
}
#endif
console.error('Invalid vertex attribute data type GLenum ' + dataType + ' passed to GL function!');
}
if (dimension == 0x80E1 /* GL_BGRA */) {
console.error('WebGL does not support size=GL_BGRA in a call to glVertexAttribPointer! Please use size=4 and type=GL_UNSIGNED_BYTE instead!');
} else if (dimension < 1 || dimension > 4) {
console.error('Invalid dimension='+dimension+' in call to glVertexAttribPointer, must be 1,2,3 or 4.');
}
if (stride < 0 || stride > 255) {
console.error('Invalid stride='+stride+' in call to glVertexAttribPointer. Note that maximum supported stride in WebGL is 255!');
}
if (offset % sizeBytes != 0) {
console.error('GL spec section 6.4 error: vertex attribute data offset of ' + offset + ' bytes should have been a multiple of the data type size that was used: GLenum ' + dataType + ' has size of ' + sizeBytes + ' bytes!');
}
if (stride % sizeBytes != 0) {
console.error('GL spec section 6.4 error: vertex attribute data stride of ' + stride + ' bytes should have been a multiple of the data type size that was used: GLenum ' + dataType + ' has size of ' + sizeBytes + ' bytes!');
}
},
#endif
#if TRACE_WEBGL_CALLS
hookWebGLFunction: function(f, glCtx) {
var realf = 'real_' + f;
glCtx[realf] = glCtx[f];
var numArgs = glCtx[realf].length;
if (numArgs === undefined) console.warn('Unexpected WebGL function ' + f + ' when binding TRACE_WEBGL_CALLS');
var contextHandle = glCtx.canvas.GLctxObject.handle;
var threadId = (typeof _pthread_self !== 'undefined') ? _pthread_self : function() { return 1; };
// Accessing 'arguments' is super slow, so to avoid overhead, statically reason the number of arguments.
switch(numArgs) {
case 0: glCtx[f] = function webgl_0() { var ret = glCtx[realf](); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '() -> ' + ret); return ret; }; break;
case 1: glCtx[f] = function webgl_1(a1) { var ret = glCtx[realf](a1); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+') -> ' + ret); return ret; }; break;
case 2: glCtx[f] = function webgl_2(a1, a2) { var ret = glCtx[realf](a1, a2); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +') -> ' + ret); return ret; }; break;
case 3: glCtx[f] = function webgl_3(a1, a2, a3) { var ret = glCtx[realf](a1, a2, a3); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +') -> ' + ret); return ret; }; break;
case 4: glCtx[f] = function webgl_4(a1, a2, a3, a4) { var ret = glCtx[realf](a1, a2, a3, a4); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +', ' + a4 +') -> ' + ret); return ret; }; break;
case 5: glCtx[f] = function webgl_5(a1, a2, a3, a4, a5) { var ret = glCtx[realf](a1, a2, a3, a4, a5); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +', ' + a4 +', ' + a5 +') -> ' + ret); return ret; }; break;
case 6: glCtx[f] = function webgl_6(a1, a2, a3, a4, a5, a6) { var ret = glCtx[realf](a1, a2, a3, a4, a5, a6); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +', ' + a4 +', ' + a5 +', ' + a6 +') -> ' + ret); return ret; }; break;
case 7: glCtx[f] = function webgl_7(a1, a2, a3, a4, a5, a6, a7) { var ret = glCtx[realf](a1, a2, a3, a4, a5, a6, a7); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +', ' + a4 +', ' + a5 +', ' + a6 +', ' + a7 +') -> ' + ret); return ret; }; break;
case 8: glCtx[f] = function webgl_8(a1, a2, a3, a4, a5, a6, a7, a8) { var ret = glCtx[realf](a1, a2, a3, a4, a5, a6, a7, a8); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +', ' + a4 +', ' + a5 +', ' + a6 +', ' + a7 +', ' + a8 +') -> ' + ret); return ret; }; break;
case 9: glCtx[f] = function webgl_9(a1, a2, a3, a4, a5, a6, a7, a8, a9) { var ret = glCtx[realf](a1, a2, a3, a4, a5, a6, a7, a8, a9); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +', ' + a4 +', ' + a5 +', ' + a6 +', ' + a7 +', ' + a8 +', ' + a9 +') -> ' + ret); return ret; }; break;
case 10: glCtx[f] = function webgl_10(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10) { var ret = glCtx[realf](a1, a2, a3, a4, a5, a6, a7, a8, a9, a10); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +', ' + a4 +', ' + a5 +', ' + a6 +', ' + a7 +', ' + a8 +', ' + a9 +', ' + a10 +') -> ' + ret); return ret; }; break;
case 11: glCtx[f] = function webgl_11(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11) { var ret = glCtx[realf](a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11); console.error('[Thread ' + threadId() + ', GL ctx: ' + contextHandle + ']: ' + f + '('+a1+', ' + a2 +', ' + a3 +', ' + a4 +', ' + a5 +', ' + a6 +', ' + a7 +', ' + a8 +', ' + a9 +', ' + a10 +', ' + a11 +') -> ' + ret); return ret; }; break;
default: console.warn('hookWebGL failed! Unexpected length ' + glCtx[realf].length);
}
},
hookWebGL: function(glCtx) {
if (!glCtx) glCtx = this.detectWebGLContext();
if (!glCtx) return;
if (!((typeof WebGLRenderingContext !== 'undefined' && glCtx instanceof WebGLRenderingContext)
|| (typeof WebGL2RenderingContext !== 'undefined' && glCtx instanceof WebGL2RenderingContext))) {
return;
}
if (glCtx.webGlTracerAlreadyHooked) return;
glCtx.webGlTracerAlreadyHooked = true;
// Hot GL functions are ones that you'd expect to find during render loops (render calls, dynamic resource uploads), cold GL functions are load time functions (shader compilation, texture/mesh creation)
// Distinguishing between these two allows pinpointing locations of troublesome GL usage that might cause performance issues.
for(var f in glCtx) {
if (typeof glCtx[f] !== 'function' || f.indexOf('real_') == 0) continue;
this.hookWebGLFunction(f, glCtx);
}
// The above injection won't work for texImage2D and texSubImage2D, which have multiple overloads.
glCtx['texImage2D'] = function(a1, a2, a3, a4, a5, a6, a7, a8, a9) {
var ret = (a7 !== undefined) ? glCtx['real_texImage2D'](a1, a2, a3, a4, a5, a6, a7, a8, a9) : glCtx['real_texImage2D'](a1, a2, a3, a4, a5, a6);
return ret;
};
glCtx['texSubImage2D'] = function(a1, a2, a3, a4, a5, a6, a7, a8, a9) {
var ret = (a8 !== undefined) ? glCtx['real_texSubImage2D'](a1, a2, a3, a4, a5, a6, a7, a8, a9) : glCtx['real_texSubImage2D'](a1, a2, a3, a4, a5, a6, a7);
return ret;
};
glCtx['texSubImage3D'] = function(a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11) {
var ret = (a9 !== undefined) ? glCtx['real_texSubImage3D'](a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11) : glCtx['real_texSubImage2D'](a1, a2, a3, a4, a5, a6, a7, a8);
return ret;
};
},
#endif
// Returns the context handle to the new context.
createContext: function(canvas, webGLContextAttributes) {
#if OFFSCREEN_FRAMEBUFFER
// In proxied operation mode, rAF()/setTimeout() functions do not delimit frame boundaries, so can't have WebGL implementation
// try to detect when it's ok to discard contents of the rendered backbuffer.
if (webGLContextAttributes.renderViaOffscreenBackBuffer) webGLContextAttributes['preserveDrawingBuffer'] = true;
#endif
#if GL_TESTING
webGLContextAttributes['preserveDrawingBuffer'] = true;
#endif
#if MAX_WEBGL_VERSION >= 2 && MIN_CHROME_VERSION <= 57
// BUG: Workaround Chrome WebGL 2 issue: the first shipped versions of WebGL 2 in Chrome 57 did not actually implement
// the new garbage free WebGL 2 entry points that take an offset and a length to an existing heap (instead of having to
// create a completely new heap view). In Chrome the entry points only were added in to Chrome 58 and newer. For
// Chrome 57 (and older), disable WebGL 2 support altogether.
function getChromeVersion() {
var chromeVersion = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
if (chromeVersion) return chromeVersion[2]|0;
// If not chrome, fall through to return undefined. (undefined <= integer will yield false)
}
#endif
#if GL_DEBUG
var errorInfo = '?';
function onContextCreationError(event) {
errorInfo = event.statusMessage || errorInfo;
}
canvas.addEventListener('webglcontextcreationerror', onContextCreationError, false);
#endif
#if GL_PREINITIALIZED_CONTEXT
// If WebGL context has already been preinitialized for the page on the JS side, reuse that context instead. This is useful for example when
// the main page precompiles shaders for the application, in which case the WebGL context is created already before any Emscripten compiled
// code has been downloaded.
if (Module['preinitializedWebGLContext']) {
var ctx = Module['preinitializedWebGLContext'];
#if MAX_WEBGL_VERSION >= 2
webGLContextAttributes.majorVersion = (typeof WebGL2RenderingContext !== 'undefined' && ctx instanceof WebGL2RenderingContext) ? 2 : 1;
#else
webGLContextAttributes.majorVersion = 1;
#endif
} else {
#endif
#if MIN_WEBGL_VERSION >= 2
var ctx = canvas.getContext("webgl2", webGLContextAttributes);
#else
var ctx =
#if MAX_WEBGL_VERSION >= 2
(webGLContextAttributes.majorVersion > 1)
?
#if MIN_CHROME_VERSION <= 57
!(getChromeVersion() <= 57) && canvas.getContext("webgl2", webGLContextAttributes)
#else
canvas.getContext("webgl2", webGLContextAttributes)
#endif
:
#endif
(canvas.getContext("webgl", webGLContextAttributes)
// https://caniuse.com/#feat=webgl
#if MIN_IE_VERSION <= 10 || MIN_EDGE_VERSION <= 18 || MIN_FIREFOX_VERSION <= 23 || MIN_CHROME_VERSION <= 32 || MIN_SAFARI_VERSION <= 70101
|| canvas.getContext("experimental-webgl", webGLContextAttributes)
#endif
);
#endif // MAX_WEBGL_VERSION >= 2
#if GL_PREINITIALIZED_CONTEXT
}
#endif
#if GL_DEBUG
canvas.removeEventListener('webglcontextcreationerror', onContextCreationError, false);
if (!ctx) {
err('Could not create canvas: ' + [errorInfo, JSON.stringify(webGLContextAttributes)]);
return 0;
}
#else
if (!ctx) return 0;
#endif
var handle = GL.registerContext(ctx, webGLContextAttributes);
#if TRACE_WEBGL_CALLS
GL.hookWebGL(ctx);
#endif
#if GL_DISABLE_HALF_FLOAT_EXTENSION_IF_BROKEN
function disableHalfFloatExtensionIfBroken(ctx) {
var t = ctx.createTexture();
ctx.bindTexture(0xDE1/*GL_TEXTURE_2D*/, t);
for (var i = 0; i < 8 && ctx.getError(); ++i) /*no-op*/;
var ext = ctx.getExtension('OES_texture_half_float');
if (!ext) return; // no half-float extension - nothing needed to fix.
// Bug on Safari on iOS and macOS: texImage2D() and texSubImage2D() do not allow uploading pixel data to half float textures,
// rendering them useless.
// See https://bugs.webkit.org/show_bug.cgi?id=183321, https://bugs.webkit.org/show_bug.cgi?id=169999,
// https://stackoverflow.com/questions/54248633/cannot-create-half-float-oes-texture-from-uint16array-on-ipad
ctx.texImage2D(0xDE1/*GL_TEXTURE_2D*/, 0, 0x1908/*GL_RGBA*/, 1, 1, 0, 0x1908/*GL_RGBA*/, 0x8d61/*HALF_FLOAT_OES*/, new Uint16Array(4));
var broken = ctx.getError();
ctx.bindTexture(0xDE1/*GL_TEXTURE_2D*/, null);
ctx.deleteTexture(t);
if (broken) {
ctx.realGetSupportedExtensions = ctx.getSupportedExtensions;
ctx.getSupportedExtensions = function() {
#if GL_ASSERTIONS
warnOnce('Removed broken support for half-float textures. See e.g. https://bugs.webkit.org/show_bug.cgi?id=183321');
#endif
// .getSupportedExtensions() can return null if context is lost, so coerce to empty array.
return (this.realGetSupportedExtensions() || []).filter(function(ext) {
return ext.indexOf('texture_half_float') == -1;
});
}
}
}
disableHalfFloatExtensionIfBroken(ctx);
#endif
return handle;
},
#if OFFSCREEN_FRAMEBUFFER
enableOffscreenFramebufferAttributes: function(webGLContextAttributes) {
webGLContextAttributes.renderViaOffscreenBackBuffer = true;
webGLContextAttributes.preserveDrawingBuffer = true;
},
// If WebGL is being proxied from a pthread to the main thread, we can't directly render to the WebGL default back buffer
// because of WebGL's implicit swap behavior. Therefore in such modes, create an offscreen render target surface to
// which rendering is performed to, and finally flipped to the main screen.
createOffscreenFramebuffer: function(context) {
var gl = context.GLctx;
// Create FBO
var fbo = gl.createFramebuffer();
gl.bindFramebuffer(0x8D40 /*GL_FRAMEBUFFER*/, fbo);
context.defaultFbo = fbo;
#if MAX_WEBGL_VERSION >= 2
context.defaultFboForbidBlitFramebuffer = false;
if (gl.getContextAttributes().antialias) {
context.defaultFboForbidBlitFramebuffer = true;
}
#if MIN_FIREFOX_VERSION < 67
else {
// The WebGL 2 blit path doesn't work in Firefox < 67 (except in fullscreen).
// https://bugzilla.mozilla.org/show_bug.cgi?id=1523030
var firefoxMatch = navigator.userAgent.toLowerCase().match(/firefox\/(\d\d)/);
if (firefoxMatch != null) {
var firefoxVersion = firefoxMatch[1];
context.defaultFboForbidBlitFramebuffer = firefoxVersion < 67;
}
}
#endif
#endif
// Create render targets to the FBO
context.defaultColorTarget = gl.createTexture();
context.defaultDepthTarget = gl.createRenderbuffer();
GL.resizeOffscreenFramebuffer(context); // Size them up correctly (use the same mechanism when resizing on demand)
gl.bindTexture(0xDE1 /*GL_TEXTURE_2D*/, context.defaultColorTarget);
gl.texParameteri(0xDE1 /*GL_TEXTURE_2D*/, 0x2801 /*GL_TEXTURE_MIN_FILTER*/, 0x2600 /*GL_NEAREST*/);
gl.texParameteri(0xDE1 /*GL_TEXTURE_2D*/, 0x2800 /*GL_TEXTURE_MAG_FILTER*/, 0x2600 /*GL_NEAREST*/);
gl.texParameteri(0xDE1 /*GL_TEXTURE_2D*/, 0x2802 /*GL_TEXTURE_WRAP_S*/, 0x812F /*GL_CLAMP_TO_EDGE*/);
gl.texParameteri(0xDE1 /*GL_TEXTURE_2D*/, 0x2803 /*GL_TEXTURE_WRAP_T*/, 0x812F /*GL_CLAMP_TO_EDGE*/);
gl.texImage2D(0xDE1 /*GL_TEXTURE_2D*/, 0, 0x1908 /*GL_RGBA*/, gl.canvas.width, gl.canvas.height, 0, 0x1908 /*GL_RGBA*/, 0x1401 /*GL_UNSIGNED_BYTE*/, null);
gl.framebufferTexture2D(0x8D40 /*GL_FRAMEBUFFER*/, 0x8CE0 /*GL_COLOR_ATTACHMENT0*/, 0xDE1 /*GL_TEXTURE_2D*/, context.defaultColorTarget, 0);
gl.bindTexture(0xDE1 /*GL_TEXTURE_2D*/, null);
// Create depth render target to the FBO
var depthTarget = gl.createRenderbuffer();
gl.bindRenderbuffer(0x8D41 /*GL_RENDERBUFFER*/, context.defaultDepthTarget);
gl.renderbufferStorage(0x8D41 /*GL_RENDERBUFFER*/, 0x81A5 /*GL_DEPTH_COMPONENT16*/, gl.canvas.width, gl.canvas.height);
gl.framebufferRenderbuffer(0x8D40 /*GL_FRAMEBUFFER*/, 0x8D00 /*GL_DEPTH_ATTACHMENT*/, 0x8D41 /*GL_RENDERBUFFER*/, context.defaultDepthTarget);
gl.bindRenderbuffer(0x8D41 /*GL_RENDERBUFFER*/, null);
// Create blitter
var vertices = [
-1, -1,
-1, 1,
1, -1,
1, 1
];
var vb = gl.createBuffer();
gl.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, vb);
gl.bufferData(0x8892 /*GL_ARRAY_BUFFER*/, new Float32Array(vertices), 0x88E4 /*GL_STATIC_DRAW*/);
gl.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, null);
context.blitVB = vb;
var vsCode =
'attribute vec2 pos;' +
'varying lowp vec2 tex;' +
'void main() { tex = pos * 0.5 + vec2(0.5,0.5); gl_Position = vec4(pos, 0.0, 1.0); }';
var vs = gl.createShader(0x8B31 /*GL_VERTEX_SHADER*/);
gl.shaderSource(vs, vsCode);
gl.compileShader(vs);
var fsCode =
'varying lowp vec2 tex;' +
'uniform sampler2D sampler;' +
'void main() { gl_FragColor = texture2D(sampler, tex); }';
var fs = gl.createShader(0x8B30 /*GL_FRAGMENT_SHADER*/);
gl.shaderSource(fs, fsCode);
gl.compileShader(fs);
var blitProgram = gl.createProgram();
gl.attachShader(blitProgram, vs);
gl.attachShader(blitProgram, fs);
gl.linkProgram(blitProgram);
context.blitProgram = blitProgram;
context.blitPosLoc = gl.getAttribLocation(blitProgram, "pos");
gl.useProgram(blitProgram);
gl.uniform1i(gl.getUniformLocation(blitProgram, "sampler"), 0);
gl.useProgram(null);
context.defaultVao = undefined;
if (gl.createVertexArray) {
context.defaultVao = gl.createVertexArray();
gl.bindVertexArray(context.defaultVao);
gl.enableVertexAttribArray(context.blitPosLoc);
gl.bindVertexArray(null);
}
},
resizeOffscreenFramebuffer: function(context) {
var gl = context.GLctx;
// Resize color buffer
if (context.defaultColorTarget) {
var prevTextureBinding = gl.getParameter(0x8069 /*GL_TEXTURE_BINDING_2D*/);
gl.bindTexture(0xDE1 /*GL_TEXTURE_2D*/, context.defaultColorTarget);
gl.texImage2D(0xDE1 /*GL_TEXTURE_2D*/, 0, 0x1908 /*GL_RGBA*/, gl.drawingBufferWidth, gl.drawingBufferHeight, 0, 0x1908 /*GL_RGBA*/, 0x1401 /*GL_UNSIGNED_BYTE*/, null);
gl.bindTexture(0xDE1 /*GL_TEXTURE_2D*/, prevTextureBinding);
}
// Resize depth buffer
if (context.defaultDepthTarget) {
var prevRenderBufferBinding = gl.getParameter(0x8CA7 /*GL_RENDERBUFFER_BINDING*/);
gl.bindRenderbuffer(0x8D41 /*GL_RENDERBUFFER*/, context.defaultDepthTarget);
gl.renderbufferStorage(0x8D41 /*GL_RENDERBUFFER*/, 0x81A5 /*GL_DEPTH_COMPONENT16*/, gl.drawingBufferWidth, gl.drawingBufferHeight); // TODO: Read context creation parameters for what type of depth and stencil to use
gl.bindRenderbuffer(0x8D41 /*GL_RENDERBUFFER*/, prevRenderBufferBinding);
}
},
// Renders the contents of the offscreen render target onto the visible screen.
blitOffscreenFramebuffer: function(context) {
var gl = context.GLctx;
var prevScissorTest = gl.getParameter(0xC11 /*GL_SCISSOR_TEST*/);
if (prevScissorTest) gl.disable(0xC11 /*GL_SCISSOR_TEST*/);
var prevFbo = gl.getParameter(0x8CA6 /*GL_FRAMEBUFFER_BINDING*/);
#if MAX_WEBGL_VERSION >= 2
if (gl.blitFramebuffer && !context.defaultFboForbidBlitFramebuffer) {
gl.bindFramebuffer(0x8CA8 /*GL_READ_FRAMEBUFFER*/, context.defaultFbo);
gl.bindFramebuffer(0x8CA9 /*GL_DRAW_FRAMEBUFFER*/, null);
gl.blitFramebuffer(0, 0, gl.canvas.width, gl.canvas.height,
0, 0, gl.canvas.width, gl.canvas.height,
0x4000 /*GL_COLOR_BUFFER_BIT*/, 0x2600/*GL_NEAREST*/);
}
else
#endif
{
gl.bindFramebuffer(0x8D40 /*GL_FRAMEBUFFER*/, null);
var prevProgram = gl.getParameter(0x8B8D /*GL_CURRENT_PROGRAM*/);
gl.useProgram(context.blitProgram);
var prevVB = gl.getParameter(0x8894 /*GL_ARRAY_BUFFER_BINDING*/);
gl.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, context.blitVB);
var prevActiveTexture = gl.getParameter(0x84E0 /*GL_ACTIVE_TEXTURE*/);
gl.activeTexture(0x84C0 /*GL_TEXTURE0*/);
var prevTextureBinding = gl.getParameter(0x8069 /*GL_TEXTURE_BINDING_2D*/);
gl.bindTexture(0xDE1 /*GL_TEXTURE_2D*/, context.defaultColorTarget);
var prevBlend = gl.getParameter(0xBE2 /*GL_BLEND*/);
if (prevBlend) gl.disable(0xBE2 /*GL_BLEND*/);
var prevCullFace = gl.getParameter(0xB44 /*GL_CULL_FACE*/);
if (prevCullFace) gl.disable(0xB44 /*GL_CULL_FACE*/);
var prevDepthTest = gl.getParameter(0xB71 /*GL_DEPTH_TEST*/);
if (prevDepthTest) gl.disable(0xB71 /*GL_DEPTH_TEST*/);
var prevStencilTest = gl.getParameter(0xB90 /*GL_STENCIL_TEST*/);
if (prevStencilTest) gl.disable(0xB90 /*GL_STENCIL_TEST*/);
function draw() {
gl.vertexAttribPointer(context.blitPosLoc, 2, 0x1406 /*GL_FLOAT*/, false, 0, 0);
gl.drawArrays(5/*GL_TRIANGLE_STRIP*/, 0, 4);
}
#if !OFFSCREEN_FRAMEBUFFER_FORBID_VAO_PATH
if (context.defaultVao) {
// WebGL 2 or OES_vertex_array_object
var prevVAO = gl.getParameter(0x85B5 /*GL_VERTEX_ARRAY_BINDING*/);
gl.bindVertexArray(context.defaultVao);
draw();
gl.bindVertexArray(prevVAO);
}
else
#endif
{
var prevVertexAttribPointer = {
buffer: gl.getVertexAttrib(context.blitPosLoc, 0x889F /*GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING*/),
size: gl.getVertexAttrib(context.blitPosLoc, 0x8623 /*GL_VERTEX_ATTRIB_ARRAY_SIZE*/),
stride: gl.getVertexAttrib(context.blitPosLoc, 0x8624 /*GL_VERTEX_ATTRIB_ARRAY_STRIDE*/),
type: gl.getVertexAttrib(context.blitPosLoc, 0x8625 /*GL_VERTEX_ATTRIB_ARRAY_TYPE*/),
normalized: gl.getVertexAttrib(context.blitPosLoc, 0x886A /*GL_VERTEX_ATTRIB_ARRAY_NORMALIZED*/),
pointer: gl.getVertexAttribOffset(context.blitPosLoc, 0x8645 /*GL_VERTEX_ATTRIB_ARRAY_POINTER*/),
};
var maxVertexAttribs = gl.getParameter(0x8869 /*GL_MAX_VERTEX_ATTRIBS*/);
var prevVertexAttribEnables = [];
for (var i = 0; i < maxVertexAttribs; ++i) {
var prevEnabled = gl.getVertexAttrib(i, 0x8622 /*GL_VERTEX_ATTRIB_ARRAY_ENABLED*/);
var wantEnabled = i == context.blitPosLoc;
if (prevEnabled && !wantEnabled) {
gl.disableVertexAttribArray(i);
}
if (!prevEnabled && wantEnabled) {
gl.enableVertexAttribArray(i);
}
prevVertexAttribEnables[i] = prevEnabled;
}
draw();
for (var i = 0; i < maxVertexAttribs; ++i) {
var prevEnabled = prevVertexAttribEnables[i];
var nowEnabled = i == context.blitPosLoc;
if (prevEnabled && !nowEnabled) {
gl.enableVertexAttribArray(i);
}
if (!prevEnabled && nowEnabled) {
gl.disableVertexAttribArray(i);
}
}
gl.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, prevVertexAttribPointer.buffer);
gl.vertexAttribPointer(context.blitPosLoc,
prevVertexAttribPointer.size,
prevVertexAttribPointer.type,
prevVertexAttribPointer.normalized,
prevVertexAttribPointer.stride,
prevVertexAttribPointer.offset);
}
if (prevStencilTest) gl.enable(0xB90 /*GL_STENCIL_TEST*/);
if (prevDepthTest) gl.enable(0xB71 /*GL_DEPTH_TEST*/);
if (prevCullFace) gl.enable(0xB44 /*GL_CULL_FACE*/);
if (prevBlend) gl.enable(0xBE2 /*GL_BLEND*/);
gl.bindTexture(0xDE1 /*GL_TEXTURE_2D*/, prevTextureBinding);
gl.activeTexture(prevActiveTexture);
gl.bindBuffer(0x8892 /*GL_ARRAY_BUFFER*/, prevVB);
gl.useProgram(prevProgram);
}
gl.bindFramebuffer(0x8D40 /*GL_FRAMEBUFFER*/, prevFbo);
if (prevScissorTest) gl.enable(0xC11 /*GL_SCISSOR_TEST*/);
},
#endif
registerContext: function(ctx, webGLContextAttributes) {
#if USE_PTHREADS
// with pthreads a context is a location in memory with some synchronized data between threads
var handle = _malloc(8);
#if GL_ASSERTIONS
assert(handle, 'malloc() failed in GL.registerContext!');
#endif
#if GL_SUPPORT_EXPLICIT_SWAP_CONTROL
{{{ makeSetValue('handle', 0, 'webGLContextAttributes.explicitSwapControl', 'i32')}}}; // explicitSwapControl
#endif
{{{ makeSetValue('handle', 4, '_pthread_self()', 'i32')}}}; // the thread pointer of the thread that owns the control of the context
#else // USE_PTHREADS
// without pthreads a context is just an integer ID
var handle = GL.getNewId(GL.contexts);
#endif // USE_PTHREADS
var context = {
handle: handle,
attributes: webGLContextAttributes,
version: webGLContextAttributes.majorVersion,
GLctx: ctx
};
#if WORKAROUND_OLD_WEBGL_UNIFORM_UPLOAD_IGNORED_OFFSET_BUG
context.cannotHandleOffsetsInUniformArrayViews = (function(g) {
function b(c, t) {
var s = g.createShader(t);
g.shaderSource(s, c);
g.compileShader(s);
return s;
}
try {
var p = g.createProgram(); // Note: we do not delete this program so it stays part of the context we created, but that is ok - it does not do anything and we want to keep this detection size minimal.
g.attachShader(p, b("attribute vec4 p;void main(){gl_Position=p;}", 0x8B31 /*GL_VERTEX_SHADER*/));
g.attachShader(p, b("precision lowp float;uniform vec4 u;void main(){gl_FragColor=u;}", 0x8B30 /*GL_FRAGMENT_SHADER*/));
g.linkProgram(p);
var h = new Float32Array(8);
h[4] = 1;
g.useProgram(p);
var l = g.getUniformLocation(p, "u");
g.uniform4fv(l, h.subarray(4, 8)); // Uploading a 4-vector GL uniform from last four elements of array [0,0,0,0,1,0,0,0], i.e. uploading vec4=(1,0,0,0) at offset=4.
return !g.getUniform(p, l)[0]; // in proper WebGL we expect to read back the vector we just uploaded: (1,0,0,0). On buggy browser would instead have uploaded offset=0 of above array, i.e. vec4=(0,0,0,0)
} catch(e) { return false; } // If we get an exception, we assume we got some other error, and do not trigger this workaround.
})();
#endif
// Store the created context object so that we can access the context given a canvas without having to pass the parameters again.
if (ctx.canvas) ctx.canvas.GLctxObject = context;
GL.contexts[handle] = context;
#if GL_SUPPORT_AUTOMATIC_ENABLE_EXTENSIONS
if (typeof webGLContextAttributes.enableExtensionsByDefault === 'undefined' || webGLContextAttributes.enableExtensionsByDefault) {
GL.initExtensions(context);