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OGL SetBlendMode: always set blend equation and func

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Before #4581, an invocation of `SetBlendMode` could invoke
`glBlendEquationSeparate` and `glBlendFuncSeparate` even when it was
setting `glDisable(GL_BLEND)`. I couldn't figure out how to map the old
behavior over to the new BlendingState code, so I changed it to always
call the two blend functions.

Fixes https://bugs.dolphin-emu.org/issues/10120 : "Sonic Adventure 2
Battle: graphics crash when loading first Dark level".
This commit is contained in:
Michael Maltese 2017-02-28 21:29:31 -08:00
parent 83bd74aef0
commit db1d826ac3
1 changed files with 10 additions and 6 deletions
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16
Source/Core/VideoBackends/OGL/Render.cpp
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@ -1238,19 +1238,23 @@ void Renderer::SetBlendMode(bool forceUpdate)
if (state.blendenable) if (state.blendenable)
{ {
GLenum equation = state.subtract ? GL_FUNC_REVERSE_SUBTRACT : GL_FUNC_ADD;
GLenum equationAlpha = state.subtractAlpha ? GL_FUNC_REVERSE_SUBTRACT : GL_FUNC_ADD;
glEnable(GL_BLEND); glEnable(GL_BLEND);
glBlendEquationSeparate(equation, equationAlpha);
glBlendFuncSeparate(src_factors[state.srcfactor], dst_factors[state.dstfactor],
src_factors[state.srcfactoralpha], dst_factors[state.dstfactoralpha]);
} }
else else
{ {
glDisable(GL_BLEND); glDisable(GL_BLEND);
} }
// Always call glBlendEquationSeparate and glBlendFuncSeparate, even when
// GL_BLEND is disabled, as a workaround for some bugs (possibly graphics
// driver issues?). See https://bugs.dolphin-emu.org/issues/10120 : "Sonic
// Adventure 2 Battle: graphics crash when loading first Dark level"
GLenum equation = state.subtract ? GL_FUNC_REVERSE_SUBTRACT : GL_FUNC_ADD;
GLenum equationAlpha = state.subtractAlpha ? GL_FUNC_REVERSE_SUBTRACT : GL_FUNC_ADD;
glBlendEquationSeparate(equation, equationAlpha);
glBlendFuncSeparate(src_factors[state.srcfactor], dst_factors[state.dstfactor],
src_factors[state.srcfactoralpha], dst_factors[state.dstfactoralpha]);
const GLenum logic_op_codes[16] = { const GLenum logic_op_codes[16] = {
GL_CLEAR, GL_AND, GL_AND_REVERSE, GL_COPY, GL_AND_INVERTED, GL_NOOP, GL_CLEAR, GL_AND, GL_AND_REVERSE, GL_COPY, GL_AND_INVERTED, GL_NOOP,
GL_XOR, GL_OR, GL_NOR, GL_EQUIV, GL_INVERT, GL_OR_REVERSE, GL_XOR, GL_OR, GL_NOR, GL_EQUIV, GL_INVERT, GL_OR_REVERSE,