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Add subtractive blending mode to backends

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This commit is contained in:
Jack Andersen
2017-09-04 16:59:41 -10:00
parent 18cbfd2865
commit dd6e53119a
6 changed files with 71 additions and 11 deletions
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21
lib/graphicsdev/GL.cpp
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@@ -451,6 +451,7 @@ class GLShaderPipeline : public IShaderPipeline
bool m_depthWrite = true;
bool m_colorWrite = true;
bool m_alphaWrite = true;
bool m_subtractBlend = false;
CullMode m_culling;
std::vector<GLint> m_uniLocs;
GLShaderPipeline(GLData* parent) : IShaderPipeline(parent) {}
@@ -472,6 +473,7 @@ public:
m_depthWrite = other.m_depthWrite;
m_colorWrite = other.m_colorWrite;
m_alphaWrite = other.m_alphaWrite;
m_subtractBlend = other.m_subtractBlend;
m_culling = other.m_culling;
m_uniLocs = std::move(other.m_uniLocs);
return *this;
@@ -487,6 +489,10 @@ public:
{
glEnable(GL_BLEND);
glBlendFuncSeparate(m_sfactor, m_dfactor, GL_ONE, GL_ZERO);
if (m_subtractBlend)
glBlendEquation(GL_FUNC_SUBTRACT);
else
glBlendEquation(GL_FUNC_ADD);
}
else
glDisable(GL_BLEND);
@@ -688,8 +694,19 @@ IShaderPipeline* GLDataFactory::Context::newShaderPipeline
}
}
shader.m_sfactor = BLEND_FACTOR_TABLE[int(srcFac)];
shader.m_dfactor = BLEND_FACTOR_TABLE[int(dstFac)];
if (srcFac == BlendFactor::Subtract || dstFac == BlendFactor::Subtract)
{
shader.m_sfactor = GL_DST_COLOR;
shader.m_dfactor = GL_SRC_COLOR;
shader.m_subtractBlend = true;
}
else
{
shader.m_sfactor = BLEND_FACTOR_TABLE[int(srcFac)];
shader.m_dfactor = BLEND_FACTOR_TABLE[int(dstFac)];
shader.m_subtractBlend = false;
}
shader.m_depthTest = depthTest;
shader.m_depthWrite = depthWrite;
shader.m_colorWrite = colorWrite;