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Implement dual-source blending in shader

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For some GLES drivers that don't support dual-source blending, but do
support GL_EXT_shader_framebuffer_fetch, this might be useful.
This commit is contained in:
Jonathan Hamilton
2017-10-25 22:44:39 -07:00
parent 11976526d1
commit 29a9ed043b
12 changed files with 222 additions and 41 deletions
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91
Source/Core/VideoBackends/OGL/Render.cpp
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@ -522,6 +522,21 @@ Renderer::Renderer()
// depth clamping.
g_Config.backend_info.bSupportsDepthClamp = false;
if (GLExtensions::Supports("GL_EXT_shader_framebuffer_fetch"))
{
g_ogl_config.SupportedFramebufferFetch = ES_FB_FETCH_TYPE::FB_FETCH_EXT;
}
else if (GLExtensions::Supports("GL_ARM_shader_framebuffer_fetch"))
{
g_ogl_config.SupportedFramebufferFetch = ES_FB_FETCH_TYPE::FB_FETCH_ARM;
}
else
{
g_ogl_config.SupportedFramebufferFetch = ES_FB_FETCH_TYPE::FB_FETCH_NONE;
}
g_Config.backend_info.bSupportsFramebufferFetch =
g_ogl_config.SupportedFramebufferFetch != ES_FB_FETCH_TYPE::FB_FETCH_NONE;
if (GLExtensions::Version() == 300)
{
g_ogl_config.eSupportedGLSLVersion = GLSLES_300;
@ -1275,44 +1290,54 @@ void Renderer::SetBlendingState(const BlendingState& state)
bool useDualSource =
state.usedualsrc && g_ActiveConfig.backend_info.bSupportsDualSourceBlend &&
(!DriverDetails::HasBug(DriverDetails::BUG_BROKEN_DUAL_SOURCE_BLENDING) || state.dstalpha);
// Only use shader blend if we need to and we don't support dual-source blending directly
bool useShaderBlend = !useDualSource && state.usedualsrc && state.dstalpha &&
g_ActiveConfig.backend_info.bSupportsFramebufferFetch;
const GLenum src_factors[8] = {
GL_ZERO,
GL_ONE,
GL_DST_COLOR,
GL_ONE_MINUS_DST_COLOR,
useDualSource ? GL_SRC1_ALPHA : (GLenum)GL_SRC_ALPHA,
useDualSource ? GL_ONE_MINUS_SRC1_ALPHA : (GLenum)GL_ONE_MINUS_SRC_ALPHA,
GL_DST_ALPHA,
GL_ONE_MINUS_DST_ALPHA};
const GLenum dst_factors[8] = {
GL_ZERO,
GL_ONE,
GL_SRC_COLOR,
GL_ONE_MINUS_SRC_COLOR,
useDualSource ? GL_SRC1_ALPHA : (GLenum)GL_SRC_ALPHA,
useDualSource ? GL_ONE_MINUS_SRC1_ALPHA : (GLenum)GL_ONE_MINUS_SRC_ALPHA,
GL_DST_ALPHA,
GL_ONE_MINUS_DST_ALPHA};
if (state.blendenable)
{
glEnable(GL_BLEND);
}
else
if (useShaderBlend)
{
glDisable(GL_BLEND);
}
else
{
const GLenum src_factors[8] = {
GL_ZERO,
GL_ONE,
GL_DST_COLOR,
GL_ONE_MINUS_DST_COLOR,
useDualSource ? GL_SRC1_ALPHA : (GLenum)GL_SRC_ALPHA,
useDualSource ? GL_ONE_MINUS_SRC1_ALPHA : (GLenum)GL_ONE_MINUS_SRC_ALPHA,
GL_DST_ALPHA,
GL_ONE_MINUS_DST_ALPHA};
const GLenum dst_factors[8] = {
GL_ZERO,
GL_ONE,
GL_SRC_COLOR,
GL_ONE_MINUS_SRC_COLOR,
useDualSource ? GL_SRC1_ALPHA : (GLenum)GL_SRC_ALPHA,
useDualSource ? GL_ONE_MINUS_SRC1_ALPHA : (GLenum)GL_ONE_MINUS_SRC_ALPHA,
GL_DST_ALPHA,
GL_ONE_MINUS_DST_ALPHA};
// 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]);
if (state.blendenable)
{
glEnable(GL_BLEND);
}
else
{
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] = {
GL_CLEAR, GL_AND, GL_AND_REVERSE, GL_COPY, GL_AND_INVERTED, GL_NOOP,