diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/library_gl.js | 45 |
1 files changed, 39 insertions, 6 deletions
diff --git a/src/library_gl.js b/src/library_gl.js index 713763d2..91bb74de 100644 --- a/src/library_gl.js +++ b/src/library_gl.js @@ -374,6 +374,9 @@ var LibraryGL = { }, #endif + // 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() { if (GL.initExtensions.done) return; GL.initExtensions.done = true; @@ -394,6 +397,7 @@ var LibraryGL = { GL.generateTempBuffers(); #endif + // Detect the presence of a few extensions manually, this GL interop layer itself will need to know if they exist. GL.compressionExt = Module.ctx.getExtension('WEBGL_compressed_texture_s3tc') || Module.ctx.getExtension('MOZ_WEBGL_compressed_texture_s3tc') || Module.ctx.getExtension('WEBKIT_WEBGL_compressed_texture_s3tc'); @@ -404,12 +408,35 @@ var LibraryGL = { GL.floatExt = Module.ctx.getExtension('OES_texture_float'); - GL.elementIndexUintExt = Module.ctx.getExtension('OES_element_index_uint'); - GL.standardDerivativesExt = Module.ctx.getExtension('OES_standard_derivatives'); + // 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 = [ "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", "ANGLE_instanced_arrays", + "OES_texture_float_linear", "OES_texture_half_float_linear", "WEBGL_compressed_texture_atc", + "WEBGL_compressed_texture_pvrtc", "EXT_color_buffer_half_float", "WEBGL_color_buffer_float", + "EXT_frag_depth", "EXT_sRGB", "WEBGL_draw_buffers", "WEBGL_shared_resources" ]; + + function shouldEnableAutomatically(extension) { + for(var i in automaticallyEnabledExtensions) { + var include = automaticallyEnabledExtensions[i]; + if (ext.indexOf(include) != -1) { + return true; + } + } + return false; + } - GL.depthTextureExt = Module.ctx.getExtension("WEBGL_depth_texture") || - Module.ctx.getExtension("MOZ_WEBGL_depth_texture") || - Module.ctx.getExtension("WEBKIT_WEBGL_depth_texture"); + var extensions = Module.ctx.getSupportedExtensions(); + for(var e in extensions) { + var ext = extensions[e].replace('MOZ_', '').replace('WEBKIT_', ''); + if (automaticallyEnabledExtensions.indexOf(ext) != -1) { + Module.ctx.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'. @@ -476,7 +503,13 @@ var LibraryGL = { case 0x1F02 /* GL_VERSION */: return allocate(intArrayFromString(Module.ctx.getParameter(name_)), 'i8', ALLOC_NORMAL); case 0x1F03 /* GL_EXTENSIONS */: - return allocate(intArrayFromString(Module.ctx.getSupportedExtensions().join(' ')), 'i8', ALLOC_NORMAL); + var exts = Module.ctx.getSupportedExtensions(); + var gl_exts = []; + for (i in exts) { + gl_exts.push(exts[i]); + gl_exts.push("GL_" + exts[i]); + } + return allocate(intArrayFromString(gl_exts.join(' ')), 'i8', ALLOC_NORMAL); // XXX this leaks! TODO: Cache all results like this in library_gl.js to be clean and nice and avoid leaking. case 0x8B8C /* GL_SHADING_LANGUAGE_VERSION */: return allocate(intArrayFromString('OpenGL ES GLSL 1.00 (WebGL)'), 'i8', ALLOC_NORMAL); default: |