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Create WebGL 2 context if available. Work around Chrome performance bug https://bugs.chromium.org/p/chromium/issues/detail?id=1045643

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Jukka Jylänki 2020-03-30 16:17:56 +03:00 committed by Бранимир Караџић
parent 4a8276cb29
commit d26aac6d2c
1 changed files with 21 additions and 23 deletions
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44
src/glcontext_html5.cpp
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@ -108,37 +108,35 @@ namespace bgfx { namespace gl
{
emscripten_webgl_init_context_attributes(&s_attrs);
s_attrs.alpha = false;
// Work around bug https://bugs.chromium.org/p/chromium/issues/detail?id=1045643 in Chrome
// by having alpha always enabled.
s_attrs.alpha = true;
s_attrs.premultipliedAlpha = false;
s_attrs.depth = true;
s_attrs.stencil = true;
s_attrs.enableExtensionsByDefault = true;
s_attrs.antialias = false;
// let emscripten figure out the best WebGL context to create
s_attrs.majorVersion = 0;
s_attrs.majorVersion = 0;
s_attrs.minorVersion = 0;
const char* canvas = (const char*) _nwh;
int context = emscripten_webgl_create_context(canvas, &s_attrs);
if (context <= 0)
for(int version = 2; version >= 1; --version)
{
BX_TRACE("Failed to create WebGL context. (Canvas handle: '%s', error %d)", canvas, (int)context);
return NULL;
s_attrs.majorVersion = version;
EMSCRIPTEN_WEBGL_CONTEXT_HANDLE context = emscripten_webgl_create_context(canvas, &s_attrs);
if (context > 0)
{
emscripten_webgl_make_context_current(context);
SwapChainGL* swapChain = BX_NEW(g_allocator, SwapChainGL)(context, canvas);
import(1);
return swapChain;
}
}
int result = emscripten_webgl_make_context_current(context);
if (EMSCRIPTEN_RESULT_SUCCESS != result)
{
BX_TRACE("emscripten_webgl_make_context_current failed (%d)", result);
return NULL;
}
SwapChainGL* swapChain = BX_NEW(g_allocator, SwapChainGL)(context, canvas);
import(1);
return swapChain;
BX_TRACE("Failed to create WebGL context. (Canvas handle: '%s', error %d)", canvas, (int)context);
return NULL;
}
uint64_t GlContext::getCaps() const