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Move current love.graphics.setStencilMode functionality to setStencilState.

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Add new higher level love.graphics.setStencilMode function.
- Add love.graphics.setStencilMode(mode [, value = 1])
- Add love.graphics.setStencilMode().
- Add mode, value = love.graphics.getStencilMode().

The possible modes are "off" (same as no parameters), "draw", and "test".
The "draw" mode disables color writes and sets the stencil state to ("replace", "always") using the given value.
The "test" mode enables color writes and sets the stencil state to ("keep", "equal") using the given value to compare to.
This commit is contained in:
Sasha Szpakowski
2024-01-04 16:23:49 -04:00
parent 77c5ea1d6b
commit 9b5851e039
15 changed files with 166 additions and 46 deletions
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src/modules/graphics/renderstate.cpp
+45 -3
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@@ -28,7 +28,7 @@ namespace graphics
// These are all with premultiplied alpha. computeBlendState adjusts for
// alpha-multiply if needed.
static const BlendState states[BLEND_MAX_ENUM] =
static const BlendState blendStates[BLEND_MAX_ENUM] =
{
// BLEND_ALPHA
{BLENDOP_ADD, BLENDOP_ADD, BLENDFACTOR_ONE, BLENDFACTOR_ONE, BLENDFACTOR_ONE_MINUS_SRC_ALPHA, BLENDFACTOR_ONE_MINUS_SRC_ALPHA},
@@ -63,7 +63,7 @@ static const BlendState states[BLEND_MAX_ENUM] =
BlendState computeBlendState(BlendMode mode, BlendAlpha alphamode)
{
BlendState s = states[mode];
BlendState s = blendStates[mode];
// We can only do alpha-multiplication when srcRGB would have been unmodified.
if (s.srcFactorRGB == BLENDFACTOR_ONE && alphamode == BLENDALPHA_MULTIPLY && mode != BLEND_NONE)
@@ -87,7 +87,7 @@ BlendMode computeBlendMode(BlendState s, BlendAlpha &alphamode)
for (int i = 0; i < (int) BLEND_MAX_ENUM; i++)
{
if (i != (int) BLEND_CUSTOM && states[i] == s)
if (i != (int) BLEND_CUSTOM && blendStates[i] == s)
{
alphamode = alphamultiply ? BLENDALPHA_MULTIPLY : BLENDALPHA_PREMULTIPLIED;
return (BlendMode) i;
@@ -111,6 +111,39 @@ bool isAlphaMultiplyBlendSupported(BlendMode mode)
}
}
static const StencilState stencilStates[STENCIL_MODE_MAX_ENUM] =
{
// STENCIL_MODE_OFF
{},
// STENCIL_MODE_DRAW
{COMPARE_ALWAYS, STENCIL_REPLACE},
// STENCIL_MODE_TEST
{COMPARE_EQUAL, STENCIL_KEEP},
// STENCIL_MODE_CUSTOM - N/A
{},
};
StencilState computeStencilState(StencilMode mode, int value)
{
StencilState s = stencilStates[mode];
s.value = value;
return s;
}
StencilMode computeStencilMode(const StencilState &s)
{
for (int i = 0; i < (int)STENCIL_MODE_MAX_ENUM; i++)
{
if (stencilStates[i].action == s.action && stencilStates[i].compare == s.compare)
return (StencilMode) i;
}
return STENCIL_MODE_CUSTOM;
}
CompareMode getReversedCompareMode(CompareMode mode)
{
switch (mode)
@@ -171,6 +204,15 @@ STRINGMAP_BEGIN(BlendOperation, BLENDOP_MAX_ENUM, blendOperation)
}
STRINGMAP_END(BlendOperation, BLENDOP_MAX_ENUM, blendOperation)
STRINGMAP_BEGIN(StencilMode, STENCIL_MODE_MAX_ENUM, stencilMode)
{
{ "off", STENCIL_MODE_OFF },
{ "draw", STENCIL_MODE_DRAW },
{ "test", STENCIL_MODE_TEST },
{ "custom", STENCIL_MODE_CUSTOM },
}
STRINGMAP_END(StencilMode, STENCIL_MODE_MAX_ENUM, stencilMode)
STRINGMAP_BEGIN(StencilAction, STENCIL_MAX_ENUM, stencilAction)
{
{ "keep", STENCIL_KEEP },