/
library_gl.js
7990 lines (7246 loc) · 326 KB
/
library_gl.js
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/*
* GL support. See http://kripken.github.io/emscripten-site/docs/porting/multimedia_and_graphics/OpenGL-support.html
* for current status.
*/
var LibraryGL = {
$GL__postset: 'var GLctx; GL.init()',
$GL: {
#if GL_DEBUG
debug: true,
#endif
counter: 1, // 0 is reserved as 'null' in gl
lastError: 0,
buffers: [],
mappedBuffers: {},
programs: [],
framebuffers: [],
renderbuffers: [],
textures: [],
uniforms: [],
shaders: [],
vaos: [],
contexts: [],
currentContext: null,
offscreenCanvases: {}, // DOM ID -> OffscreenCanvas mappings of <canvas> elements that have their rendering control transferred to offscreen.
timerQueriesEXT: [],
#if USE_WEBGL2
queries: [],
samplers: [],
transformFeedbacks: [],
syncs: [],
#endif
#if USES_GL_EMULATION
currArrayBuffer: 0,
currElementArrayBuffer: 0,
#endif
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
],
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 USE_WEBGL2
stringiCache: {},
#endif
tempFixedLengthArray: [],
packAlignment: 4, // default alignment is 4 bytes
unpackAlignment: 4, // default alignment is 4 bytes
init: function() {
#if USES_GL_EMULATION
GL.createLog2ceilLookup(GL.MAX_TEMP_BUFFER_SIZE);
#endif
GL.miniTempBuffer = new Float32Array(GL.MINI_TEMP_BUFFER_SIZE);
for (var i = 0; i < GL.MINI_TEMP_BUFFER_SIZE; i++) {
GL.miniTempBufferViews[i] = GL.miniTempBuffer.subarray(0, i+1);
}
// 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.
for (var i = 0; i < 32; i++) {
GL.tempFixedLengthArray.push(new Array(i));
}
},
// 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.lastError) {
GL.lastError = errorCode;
}
},
// 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;
},
// Mini temp buffer
MINI_TEMP_BUFFER_SIZE: 256,
miniTempBuffer: null,
miniTempBufferViews: [0], // index i has the view of size i+1
#if USES_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: null,
createLog2ceilLookup: function(maxValue) {
GL.log2ceilLookup = new Uint8Array(maxValue+1);
var log2 = 0;
var pow2 = 1;
GL.log2ceilLookup[0] = 0;
for (var i = 1; i <= maxValue; ++i) {
if (i > pow2) {
pow2 <<= 1;
++log2;
}
GL.log2ceilLookup[i] = log2;
}
},
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(context.GLctx.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(context.GLctx.ELEMENT_ARRAY_BUFFER, quadIndexes, context.GLctx.STATIC_DRAW);
context.GLctx.bindBuffer(context.GLctx.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(GLctx.ARRAY_BUFFER_BINDING);
ringbuffer[nextFreeBufferIndex] = GLctx.createBuffer();
GLctx.bindBuffer(GLctx.ARRAY_BUFFER, ringbuffer[nextFreeBufferIndex]);
GLctx.bufferData(GLctx.ARRAY_BUFFER, 1 << idx, GLctx.DYNAMIC_DRAW);
GLctx.bindBuffer(GLctx.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(GLctx.ELEMENT_ARRAY_BUFFER_BINDING);
GL.currentContext.tempIndexBuffers[idx] = GLctx.createBuffer();
GLctx.bindBuffer(GLctx.ELEMENT_ARRAY_BUFFER, GL.currentContext.tempIndexBuffers[idx]);
GLctx.bufferData(GLctx.ELEMENT_ARRAY_BUFFER, 1 << idx, GLctx.DYNAMIC_DRAW);
GLctx.bindBuffer(GLctx.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
#if LEGACY_GL_EMULATION
// Find a token in a shader source string
findToken: function(source, token) {
function isIdentChar(ch) {
if (ch >= 48 && ch <= 57) // 0-9
return true;
if (ch >= 65 && ch <= 90) // A-Z
return true;
if (ch >= 97 && ch <= 122) // a-z
return true;
return false;
}
var i = -1;
do {
i = source.indexOf(token, i + 1);
if (i < 0) {
break;
}
if (i > 0 && isIdentChar(source[i - 1])) {
continue;
}
i += token.length;
if (i < source.length - 1 && isIdentChar(source[i + 1])) {
continue;
}
return true;
} while (true);
return false;
},
#endif
getSource: function(shader, count, string, length) {
var source = '';
for (var i = 0; i < count; ++i) {
var frag;
if (length) {
var len = {{{ makeGetValue('length', 'i*4', 'i32') }}};
if (len < 0) {
frag = Pointer_stringify({{{ makeGetValue('string', 'i*4', 'i32') }}});
} else {
frag = Pointer_stringify({{{ makeGetValue('string', 'i*4', 'i32') }}}, len);
}
} else {
frag = Pointer_stringify({{{ makeGetValue('string', 'i*4', 'i32') }}});
}
source += frag;
}
#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 (GL.findToken(source, "dFdx") ||
GL.findToken(source, "dFdy") ||
GL.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(GLctx.ARRAY_BUFFER, buf);
GLctx.bufferSubData(GLctx.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(GLctx.ARRAY_BUFFER, GL.buffers[GL.currArrayBuffer]);
}
},
#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:
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
webGLFunctionLengths: { 'getContextAttributes': 0, 'isContextLost': 0, 'getSupportedExtensions': 0, 'createBuffer': 0, 'createFramebuffer': 0, 'createProgram': 0, 'createRenderbuffer': 0, 'createTexture': 0, 'finish': 0, 'flush': 0, 'getError': 0, 'createVertexArray': 0, 'createQuery': 0, 'createSampler': 0, 'createTransformFeedback': 0, 'endTransformFeedback': 0, 'pauseTransformFeedback': 0, 'resumeTransformFeedback': 0, 'commit': 0,
'getExtension': 1, 'activeTexture': 1, 'blendEquation': 1, 'checkFramebufferStatus': 1, 'clear': 1, 'clearDepth': 1, 'clearStencil': 1, 'compileShader': 1, 'createShader': 1, 'cullFace': 1, 'deleteBuffer': 1, 'deleteFramebuffer': 1, 'deleteProgram': 1, 'deleteRenderbuffer': 1, 'deleteShader': 1, 'deleteTexture': 1, 'depthFunc': 1, 'depthMask': 1, 'disable': 1, 'disableVertexAttribArray': 1, 'enable': 1, 'enableVertexAttribArray': 1, 'frontFace': 1, 'generateMipmap': 1, 'getAttachedShaders': 1, 'getParameter': 1, 'getProgramInfoLog': 1, 'getShaderInfoLog': 1, 'getShaderSource': 1, 'isBuffer': 1, 'isEnabled': 1, 'isFramebuffer': 1, 'isProgram': 1, 'isRenderbuffer': 1, 'isShader': 1, 'isTexture': 1, 'lineWidth': 1, 'linkProgram': 1, 'stencilMask': 1, 'useProgram': 1, 'validateProgram': 1, 'deleteQuery': 1, 'isQuery': 1, 'deleteVertexArray': 1, 'bindVertexArray': 1, 'isVertexArray': 1, 'drawBuffers': 1, 'readBuffer': 1, 'endQuery': 1, 'deleteSampler': 1, 'isSampler': 1, 'isSync': 1, 'deleteSync': 1, 'deleteTransformFeedback': 1, 'isTransformFeedback': 1, 'beginTransformFeedback': 1,
'attachShader': 2, 'bindBuffer': 2, 'bindFramebuffer': 2, 'bindRenderbuffer': 2, 'bindTexture': 2, 'blendEquationSeparate': 2, 'blendFunc': 2, 'depthRange': 2, 'detachShader': 2, 'getActiveAttrib': 2, 'getActiveUniform': 2, 'getAttribLocation': 2, 'getBufferParameter': 2, 'getProgramParameter': 2, 'getRenderbufferParameter': 2, 'getShaderParameter': 2, 'getShaderPrecisionFormat': 2, 'getTexParameter': 2, 'getUniform': 2, 'getUniformLocation': 2, 'getVertexAttrib': 2, 'getVertexAttribOffset': 2, 'hint': 2, 'pixelStorei': 2, 'polygonOffset': 2, 'sampleCoverage': 2, 'shaderSource': 2, 'stencilMaskSeparate': 2, 'uniform1f': 2, 'uniform1fv': 2, 'uniform1i': 2, 'uniform1iv': 2, 'uniform2fv': 2, 'uniform2iv': 2, 'uniform3fv': 2, 'uniform3iv': 2, 'uniform4fv': 2, 'uniform4iv': 2, 'vertexAttrib1f': 2, 'vertexAttrib1fv': 2, 'vertexAttrib2fv': 2, 'vertexAttrib3fv': 2, 'vertexAttrib4fv': 2, 'vertexAttribDivisor': 2, 'beginQuery': 2, 'invalidateFramebuffer': 2, 'getFragDataLocation': 2, 'uniform1ui': 2, 'uniform1uiv': 2, 'uniform2uiv': 2, 'uniform3uiv': 2, 'uniform4uiv': 2, 'vertexAttribI4iv': 2, 'vertexAttribI4uiv': 2, 'getQuery': 2, 'getQueryParameter': 2, 'bindSampler': 2, 'getSamplerParameter': 2, 'fenceSync': 2, 'getSyncParameter': 2, 'bindTransformFeedback': 2, 'getTransformFeedbackVarying': 2, 'getIndexedParameter': 2, 'getUniformIndices': 2, 'getUniformBlockIndex': 2, 'getActiveUniformBlockName': 2,
'bindAttribLocation': 3, 'bufferData': 3, 'bufferSubData': 3, 'drawArrays': 3, 'getFramebufferAttachmentParameter': 3, 'stencilFunc': 3, 'stencilOp': 3, 'texParameterf': 3, 'texParameteri': 3, 'uniform2f': 3, 'uniform2i': 3, 'uniformMatrix2fv': 3, 'uniformMatrix3fv': 3, 'uniformMatrix4fv': 3, 'vertexAttrib2f': 3, 'getBufferSubData': 3, 'getInternalformatParameter': 3, 'uniform2ui': 3, 'uniformMatrix2x3fv': 3, 'uniformMatrix3x2fv': 3, 'uniformMatrix2x4fv': 3, 'uniformMatrix4x2fv': 3, 'uniformMatrix3x4fv': 3, 'uniformMatrix4x3fv': 3, 'clearBufferiv': 3, 'clearBufferuiv': 3, 'clearBufferfv': 3, 'samplerParameteri': 3, 'samplerParameterf': 3, 'clientWaitSync': 3, 'waitSync': 3, 'transformFeedbackVaryings': 3, 'bindBufferBase': 3, 'getActiveUniforms': 3, 'getActiveUniformBlockParameter': 3, 'uniformBlockBinding': 3,
'blendColor': 4, 'blendFuncSeparate': 4, 'clearColor': 4, 'colorMask': 4, 'drawElements': 4, 'framebufferRenderbuffer': 4, 'renderbufferStorage': 4, 'scissor': 4, 'stencilFuncSeparate': 4, 'stencilOpSeparate': 4, 'uniform3f': 4, 'uniform3i': 4, 'vertexAttrib3f': 4, 'viewport': 4, 'drawArraysInstanced': 4, 'uniform3ui': 4, 'clearBufferfi': 4,
'framebufferTexture2D': 5, 'uniform4f': 5, 'uniform4i': 5, 'vertexAttrib4f': 5, 'drawElementsInstanced': 5, 'copyBufferSubData': 5, 'framebufferTextureLayer': 5, 'renderbufferStorageMultisample': 5, 'texStorage2D': 5, 'uniform4ui': 5, 'vertexAttribI4i': 5, 'vertexAttribI4ui': 5, 'vertexAttribIPointer': 5, 'bindBufferRange': 5,
'texImage2D': 6, 'vertexAttribPointer': 6, 'invalidateSubFramebuffer': 6, 'texStorage3D': 6, 'drawRangeElements': 6,
'compressedTexImage2D': 7, 'readPixels': 7, 'texSubImage2D': 7,
'compressedTexSubImage2D': 8, 'copyTexImage2D': 8, 'copyTexSubImage2D': 8, 'compressedTexImage3D': 8,
'copyTexSubImage3D': 9,
'blitFramebuffer': 10, 'texImage3D': 10, 'compressedTexSubImage3D': 10,
'texSubImage3D': 11 },
hookWebGLFunction: function(f, glCtx) {
var realf = 'real_' + f;
glCtx[realf] = glCtx[f];
var numArgs = GL.webGLFunctionLengths[f]; // On Firefox & Chrome, could do "glCtx[realf].length", but that doesn't work on Edge, which always reports 0.
if (numArgs === undefined) throw 'Unexpected WebGL function ' + f;
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: throw '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 (typeof webGLContextAttributes['majorVersion'] === 'undefined' && typeof webGLContextAttributes['minorVersion'] === 'undefined') {
#if USE_WEBGL2
// If caller did not specify a context, initialize the best one that is possibly available.
// To explicitly create a WebGL 1 or a WebGL 2 context, call this function with a specific
// majorVersion set.
if (typeof WebGL2RenderingContext !== 'undefined') webGLContextAttributes['majorVersion'] = 2;
else webGLContextAttributes['majorVersion'] = 1;
#else
webGLContextAttributes['majorVersion'] = 1;
#endif
webGLContextAttributes['minorVersion'] = 0;
}
#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
var ctx;
var errorInfo = '?';
function onContextCreationError(event) {
errorInfo = event.statusMessage || errorInfo;
}
try {
canvas.addEventListener('webglcontextcreationerror', onContextCreationError, false);
try {
#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']) {
ctx = Module['preinitializedWebGLContext'];
webGLContextAttributes['majorVersion'] = (typeof WebGL2RenderingContext !== 'undefined' && ctx instanceof WebGL2RenderingContext) ? 2 : 1;
} else
#endif
if (webGLContextAttributes['majorVersion'] == 1 && webGLContextAttributes['minorVersion'] == 0) {
ctx = canvas.getContext("webgl", webGLContextAttributes) || canvas.getContext("experimental-webgl", webGLContextAttributes);
} else if (webGLContextAttributes['majorVersion'] == 2 && webGLContextAttributes['minorVersion'] == 0) {
ctx = canvas.getContext("webgl2", webGLContextAttributes);
} else {
throw 'Unsupported WebGL context version ' + majorVersion + '.' + minorVersion + '!'
}
} finally {
canvas.removeEventListener('webglcontextcreationerror', onContextCreationError, false);
}
if (!ctx) throw ':(';
} catch (e) {
out('Could not create canvas: ' + [errorInfo, e, JSON.stringify(webGLContextAttributes)]);
return 0;
}
if (!ctx) return 0;
var context = GL.registerContext(ctx, webGLContextAttributes);
#if TRACE_WEBGL_CALLS
GL.hookWebGL(ctx);
#endif
return context;
},
#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(gl.FRAMEBUFFER, fbo);
context.defaultFbo = fbo;
// 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(gl.TEXTURE_2D, context.defaultColorTarget);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.canvas.width, gl.canvas.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, context.defaultColorTarget, 0);
gl.bindTexture(gl.TEXTURE_2D, null);
// Create depth render target to the FBO
var depthTarget = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, context.defaultDepthTarget);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, gl.canvas.width, gl.canvas.height);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, context.defaultDepthTarget);
gl.bindRenderbuffer(gl.RENDERBUFFER, null);
// Create blitter
var vertices = [
-1, -1,
-1, 1,
1, -1,
1, 1
];
var vb = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vb);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
gl.bindBuffer(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(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(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);
},
resizeOffscreenFramebuffer: function(context) {
var gl = context.GLctx;
// Resize color buffer
if (context.defaultColorTarget) {
var prevTextureBinding = gl.getParameter(gl.TEXTURE_BINDING_2D);
gl.bindTexture(gl.TEXTURE_2D, context.defaultColorTarget);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.drawingBufferWidth, gl.drawingBufferHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
gl.bindTexture(gl.TEXTURE_2D, prevTextureBinding);
}
// Resize depth buffer
if (context.defaultDepthTarget) {
var prevRenderBufferBinding = gl.getParameter(gl.RENDERBUFFER_BINDING);
gl.bindRenderbuffer(gl.RENDERBUFFER, context.defaultDepthTarget);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, gl.drawingBufferWidth, gl.drawingBufferHeight); // TODO: Read context creation parameters for what type of depth and stencil to use
gl.bindRenderbuffer(gl.RENDERBUFFER, prevRenderBufferBinding);
}
},
// Renders the contents of the offscreen render target onto the visible screen.
blitOffscreenFramebuffer: function(context) {
var gl = context.GLctx;
var prevFbo = gl.getParameter(gl.FRAMEBUFFER_BINDING);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
var prevProgram = gl.getParameter(gl.CURRENT_PROGRAM);
gl.useProgram(context.blitProgram);
var prevVB = gl.getParameter(gl.ARRAY_BUFFER_BINDING);
gl.bindBuffer(gl.ARRAY_BUFFER, context.blitVB);
gl.vertexAttribPointer(context.blitPosLoc, 2, gl.FLOAT, false, 0, 0);
gl.enableVertexAttribArray(context.blitPosLoc);
var prevActiveTexture = gl.getParameter(gl.ACTIVE_TEXTURE);
gl.activeTexture(gl.TEXTURE0);
var prevTextureBinding = gl.getParameter(gl.TEXTURE_BINDING_2D);
gl.bindTexture(gl.TEXTURE_2D, context.defaultColorTarget);
var prevBlend = gl.getParameter(gl.BLEND);
if (prevBlend) gl.disable(gl.BLEND);
var prevCullFace = gl.getParameter(gl.CULL_FACE);
if (prevCullFace) gl.disable(gl.CULL_FACE);
var prevDepthTest = gl.getParameter(gl.DEPTH_TEST);
if (prevDepthTest) gl.disable(gl.DEPTH_TEST);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
if (prevDepthTest) gl.enable(gl.DEPTH_TEST);
if (prevCullFace) gl.enable(gl.CULL_FACE);
if (prevBlend) gl.enable(gl.BLEND);
gl.bindTexture(gl.TEXTURE_2D, prevTextureBinding);
gl.activeTexture(prevActiveTexture);
// prevEnableVertexAttribArray?
// prevVertexAttribPointer?
gl.bindBuffer(gl.ARRAY_BUFFER, prevVB);
gl.useProgram(prevProgram);
gl.bindFramebuffer(gl.FRAMEBUFFER, prevFbo);
},
#endif
registerContext: function(ctx, webGLContextAttributes) {
var handle = GL.getNewId(GL.contexts);
var context = {
handle: handle,
attributes: webGLContextAttributes,
version: webGLContextAttributes['majorVersion'],
GLctx: ctx
};
#if USE_WEBGL2
// BUG: Workaround Chrome WebGL 2 issue: the first shipped versions of WebGL 2 in Chrome did not actually implement the new WebGL 2 functions.
// Those are supported only in Chrome 58 and newer.
function getChromeVersion() {
var raw = navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./);
return raw ? parseInt(raw[2], 10) : false;
}
context.supportsWebGL2EntryPoints = (context.version >= 2) && (getChromeVersion() === false || getChromeVersion() >= 58);
#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 (typeof webGLContextAttributes['enableExtensionsByDefault'] === 'undefined' || webGLContextAttributes['enableExtensionsByDefault']) {
GL.initExtensions(context);
}
#if OFFSCREEN_FRAMEBUFFER
if (webGLContextAttributes['renderViaOffscreenBackBuffer']) GL.createOffscreenFramebuffer(context);
#else
#if GL_DEBUG
if (webGLContextAttributes['renderViaOffscreenBackBuffer']) err('renderViaOffscreenBackBuffer=true specified in WebGL context creation attributes, pass linker flag -s OFFSCREEN_FRAMEBUFFER=1 to enable support!');
#endif
#endif
return handle;
},
makeContextCurrent: function(contextHandle) {
var context = GL.contexts[contextHandle];
if (!context) return false;
GLctx = Module.ctx = context.GLctx; // Active WebGL context object.
GL.currentContext = context; // Active Emscripten GL layer context object.
return true;
},
getContext: function(contextHandle) {
return GL.contexts[contextHandle];
},
deleteContext: function(contextHandle) {
if (GL.currentContext === GL.contexts[contextHandle]) GL.currentContext = null;
if (typeof JSEvents === 'object') JSEvents.removeAllHandlersOnTarget(GL.contexts[contextHandle].GLctx.canvas); // Release all JS event handlers on the DOM element that the GL context is associated with since the context is now deleted.
if (GL.contexts[contextHandle] && GL.contexts[contextHandle].GLctx.canvas) GL.contexts[contextHandle].GLctx.canvas.GLctxObject = undefined; // Make sure the canvas object no longer refers to the context object so there are no GC surprises.
GL.contexts[contextHandle] = null;
},
// In WebGL, extensions must be explicitly enabled to be active, see http://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.14
// In GLES2, all extensions are enabled by default without additional operations. Init all extensions we need to give to GLES2 user
// code here, so that GLES2 code can operate without changing behavior.
initExtensions: function(context) {
// If this function is called without a specific context object, init the extensions of the currently active context.
if (!context) context = GL.currentContext;
if (context.initExtensionsDone) return;
context.initExtensionsDone = true;
var GLctx = context.GLctx;
context.maxVertexAttribs = GLctx.getParameter(GLctx.MAX_VERTEX_ATTRIBS);
#if FULL_ES2
context.clientBuffers = [];
for (var i = 0; i < context.maxVertexAttribs; i++) {
context.clientBuffers[i] = { enabled: false, clientside: false, size: 0, type: 0, normalized: 0, stride: 0, ptr: 0, vertexAttribPointerAdaptor: null };
}
GL.generateTempBuffers(false, context);
#endif
// Detect the presence of a few extensions manually, this GL interop layer itself will need to know if they exist.
#if LEGACY_GL_EMULATION
context.compressionExt = GLctx.getExtension('WEBGL_compressed_texture_s3tc');
context.anisotropicExt = GLctx.getExtension('EXT_texture_filter_anisotropic');
#endif
if (context.version < 2) {
// Extension available from Firefox 26 and Google Chrome 30
var instancedArraysExt = GLctx.getExtension('ANGLE_instanced_arrays');
if (instancedArraysExt) {
GLctx['vertexAttribDivisor'] = function(index, divisor) { instancedArraysExt['vertexAttribDivisorANGLE'](index, divisor); };
GLctx['drawArraysInstanced'] = function(mode, first, count, primcount) { instancedArraysExt['drawArraysInstancedANGLE'](mode, first, count, primcount); };
GLctx['drawElementsInstanced'] = function(mode, count, type, indices, primcount) { instancedArraysExt['drawElementsInstancedANGLE'](mode, count, type, indices, primcount); };
}
// Extension available from Firefox 25 and WebKit
var vaoExt = GLctx.getExtension('OES_vertex_array_object');
if (vaoExt) {
GLctx['createVertexArray'] = function() { return vaoExt['createVertexArrayOES'](); };
GLctx['deleteVertexArray'] = function(vao) { vaoExt['deleteVertexArrayOES'](vao); };
GLctx['bindVertexArray'] = function(vao) { vaoExt['bindVertexArrayOES'](vao); };
GLctx['isVertexArray'] = function(vao) { return vaoExt['isVertexArrayOES'](vao); };
}
var drawBuffersExt = GLctx.getExtension('WEBGL_draw_buffers');
if (drawBuffersExt) {
GLctx['drawBuffers'] = function(n, bufs) { drawBuffersExt['drawBuffersWEBGL'](n, bufs); };
}
}
GLctx.disjointTimerQueryExt = GLctx.getExtension("EXT_disjoint_timer_query");
// These are the 'safe' feature-enabling extensions that don't add any performance impact related to e.g. debugging, and
// should be enabled by default so that client GLES2/GL code will not need to go through extra hoops to get its stuff working.
// As new extensions are ratified at http://www.khronos.org/registry/webgl/extensions/ , feel free to add your new extensions
// here, as long as they don't produce a performance impact for users that might not be using those extensions.
// E.g. debugging-related extensions should probably be off by default.
var automaticallyEnabledExtensions = [ // Khronos ratified WebGL extensions ordered by number (no debug extensions):
"OES_texture_float", "OES_texture_half_float", "OES_standard_derivatives",
"OES_vertex_array_object", "WEBGL_compressed_texture_s3tc", "WEBGL_depth_texture",
"OES_element_index_uint", "EXT_texture_filter_anisotropic", "EXT_frag_depth",
"WEBGL_draw_buffers", "ANGLE_instanced_arrays", "OES_texture_float_linear",
"OES_texture_half_float_linear", "EXT_blend_minmax", "EXT_shader_texture_lod",
// Community approved WebGL extensions ordered by number:
"WEBGL_compressed_texture_pvrtc", "EXT_color_buffer_half_float", "WEBGL_color_buffer_float",
"EXT_sRGB", "WEBGL_compressed_texture_etc1", "EXT_disjoint_timer_query",
"WEBGL_compressed_texture_etc", "WEBGL_compressed_texture_astc", "EXT_color_buffer_float",
"WEBGL_compressed_texture_s3tc_srgb", "EXT_disjoint_timer_query_webgl2"];
function shouldEnableAutomatically(extension) {
var ret = false;
automaticallyEnabledExtensions.forEach(function(include) {
if (extension.indexOf(include) != -1) {
ret = true;
}
});
return ret;
}
var exts = GLctx.getSupportedExtensions();
if (exts && exts.length > 0) {
GLctx.getSupportedExtensions().forEach(function(ext) {
if (automaticallyEnabledExtensions.indexOf(ext) != -1) {
GLctx.getExtension(ext); // Calling .getExtension enables that extension permanently, no need to store the return value to be enabled.
}
});
}
},
// In WebGL, uniforms in a shader program are accessed through an opaque object type 'WebGLUniformLocation'.
// In GLES2, uniforms are accessed via indices. Therefore we must generate a mapping of indices -> WebGLUniformLocations
// to provide the client code the API that uses indices.
// This function takes a linked GL program and generates a mapping table for the program.
// NOTE: Populating the uniform table is performed eagerly at glLinkProgram time, so glLinkProgram should be considered
// to be a slow/costly function call. Calling glGetUniformLocation is relatively fast, since it is always a read-only
// lookup to the table populated in this function call.
populateUniformTable: function(program) {
#if GL_ASSERTIONS
GL.validateGLObjectID(GL.programs, program, 'populateUniformTable', 'program');
#endif
var p = GL.programs[program];
GL.programInfos[program] = {
uniforms: {},
maxUniformLength: 0, // This is eagerly computed below, since we already enumerate all uniforms anyway.
maxAttributeLength: -1, // This is lazily computed and cached, computed when/if first asked, "-1" meaning not computed yet.
maxUniformBlockNameLength: -1 // Lazily computed as well
};
var ptable = GL.programInfos[program];
var utable = ptable.uniforms;
// A program's uniform table maps the string name of an uniform to an integer location of that uniform.
// The global GL.uniforms map maps integer locations to WebGLUniformLocations.
var numUniforms = GLctx.getProgramParameter(p, GLctx.ACTIVE_UNIFORMS);
for (var i = 0; i < numUniforms; ++i) {
var u = GLctx.getActiveUniform(p, i);
var name = u.name;
ptable.maxUniformLength = Math.max(ptable.maxUniformLength, name.length+1);
// Strip off any trailing array specifier we might have got, e.g. "[0]".
if (name.indexOf(']', name.length-1) !== -1) {
var ls = name.lastIndexOf('[');
name = name.slice(0, ls);
}
// Optimize memory usage slightly: If we have an array of uniforms, e.g. 'vec3 colors[3];', then
// only store the string 'colors' in utable, and 'colors[0]', 'colors[1]' and 'colors[2]' will be parsed as 'colors'+i.
// Note that for the GL.uniforms table, we still need to fetch the all WebGLUniformLocations for all the indices.
var loc = GLctx.getUniformLocation(p, name);
if (loc != null)
{
var id = GL.getNewId(GL.uniforms);
utable[name] = [u.size, id];
GL.uniforms[id] = loc;
for (var j = 1; j < u.size; ++j) {
var n = name + '['+j+']';
loc = GLctx.getUniformLocation(p, n);
id = GL.getNewId(GL.uniforms);
GL.uniforms[id] = loc;
}
}
}
}
},
glPixelStorei__sig: 'vii',
glPixelStorei: function(pname, param) {
if (pname == 0x0D05 /* GL_PACK_ALIGNMENT */) {
GL.packAlignment = param;
} else if (pname == 0x0cf5 /* GL_UNPACK_ALIGNMENT */) {
GL.unpackAlignment = param;
}
GLctx.pixelStorei(pname, param);
},
glGetString__sig: 'ii',
glGetString: function(name_) {
if (GL.stringCache[name_]) return GL.stringCache[name_];
var ret;
switch(name_) {
case 0x1F00 /* GL_VENDOR */:
case 0x1F01 /* GL_RENDERER */:
case 0x9245 /* UNMASKED_VENDOR_WEBGL */:
case 0x9246 /* UNMASKED_RENDERER_WEBGL */:
ret = allocate(intArrayFromString(GLctx.getParameter(name_)), 'i8', ALLOC_NORMAL);
break;
case 0x1F02 /* GL_VERSION */:
var glVersion = GLctx.getParameter(GLctx.VERSION);
// return GLES version string corresponding to the version of the WebGL context
#if USE_WEBGL2
if (GLctx.canvas.GLctxObject.version >= 2) glVersion = 'OpenGL ES 3.0 (' + glVersion + ')';
else
#endif
{
glVersion = 'OpenGL ES 2.0 (' + glVersion + ')';
}
ret = allocate(intArrayFromString(glVersion), 'i8', ALLOC_NORMAL);
break;
case 0x1F03 /* GL_EXTENSIONS */:
var exts = GLctx.getSupportedExtensions();
var gl_exts = [];
for (var i = 0; i < exts.length; ++i) {
gl_exts.push(exts[i]);
gl_exts.push("GL_" + exts[i]);
}
ret = allocate(intArrayFromString(gl_exts.join(' ')), 'i8', ALLOC_NORMAL);
break;
case 0x8B8C /* GL_SHADING_LANGUAGE_VERSION */:
var glslVersion = GLctx.getParameter(GLctx.SHADING_LANGUAGE_VERSION);
// extract the version number 'N.M' from the string 'WebGL GLSL ES N.M ...'
var ver_re = /^WebGL GLSL ES ([0-9]\.[0-9][0-9]?)(?:$| .*)/;
var ver_num = glslVersion.match(ver_re);
if (ver_num !== null) {
if (ver_num[1].length == 3) ver_num[1] = ver_num[1] + '0'; // ensure minor version has 2 digits
glslVersion = 'OpenGL ES GLSL ES ' + ver_num[1] + ' (' + glslVersion + ')';
}
ret = allocate(intArrayFromString(glslVersion), 'i8', ALLOC_NORMAL);
break;
default:
GL.recordError(0x0500/*GL_INVALID_ENUM*/);
#if GL_ASSERTIONS
err('GL_INVALID_ENUM in glGetString: Unknown parameter ' + name_ + '!');
#endif
return 0;
}
GL.stringCache[name_] = ret;
return ret;
},
$emscriptenWebGLGet: function(name_, p, type) {
// Guard against user passing a null pointer.
// Note that GLES2 spec does not say anything about how passing a null pointer should be treated.
// Testing on desktop core GL 3, the application crashes on glGetIntegerv to a null pointer, but
// better to report an error instead of doing anything random.
if (!p) {
#if GL_ASSERTIONS
err('GL_INVALID_VALUE in glGet' + type + 'v(name=' + name_ + ': Function called with null out pointer!');
#endif
GL.recordError(0x0501 /* GL_INVALID_VALUE */);
return;
}
var ret = undefined;
switch(name_) { // Handle a few trivial GLES values
case 0x8DFA: // GL_SHADER_COMPILER
ret = 1;
break;
case 0x8DF8: // GL_SHADER_BINARY_FORMATS
if (type !== 'Integer' && type !== 'Integer64') {
GL.recordError(0x0500); // GL_INVALID_ENUM
#if GL_ASSERTIONS
err('GL_INVALID_ENUM in glGet' + type + 'v(GL_SHADER_BINARY_FORMATS): Invalid parameter type!');
#endif
}
return; // Do not write anything to the out pointer, since no binary formats are supported.
#if USE_WEBGL2
case 0x87FE: // GL_NUM_PROGRAM_BINARY_FORMATS
#endif
case 0x8DF9: // GL_NUM_SHADER_BINARY_FORMATS
ret = 0;
break;
case 0x86A2: // GL_NUM_COMPRESSED_TEXTURE_FORMATS
// WebGL doesn't have GL_NUM_COMPRESSED_TEXTURE_FORMATS (it's obsolete since GL_COMPRESSED_TEXTURE_FORMATS returns a JS array that can be queried for length),
// so implement it ourselves to allow C++ GLES2 code get the length.
var formats = GLctx.getParameter(0x86A3 /*GL_COMPRESSED_TEXTURE_FORMATS*/);