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metal: blending

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This commit is contained in:
Mitchell Hashimoto
2022-10-30 19:09:03 -07:00
parent 178418834c
commit 4b5174d2c6
1 changed files with 41 additions and 0 deletions
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41
src/renderer/Metal.zig
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@ -810,7 +810,16 @@ fn initPipelineState(device: objc.Object, library: objc.Object) !objc.Object {
// Value is MTLPixelFormatBGRA8Unorm
attachment.setProperty("pixelFormat", @as(c_ulong, 80));
// Blending. This is required so that our text we render on top
// of our drawable properly blends into the bg.
attachment.setProperty("blendingEnabled", true);
attachment.setProperty("rgbBlendOperation", @enumToInt(MTLBlendOperation.add));
attachment.setProperty("alphaBlendOperation", @enumToInt(MTLBlendOperation.add));
attachment.setProperty("sourceRGBBlendFactor", @enumToInt(MTLBlendFactor.source_alpha));
attachment.setProperty("sourceAlphaBlendFactor", @enumToInt(MTLBlendFactor.source_alpha));
attachment.setProperty("destinationRGBBlendFactor", @enumToInt(MTLBlendFactor.one_minus_source_alpha));
attachment.setProperty("destinationAlphaBlendFactor", @enumToInt(MTLBlendFactor.one_minus_source_alpha));
}
// Make our state
@ -939,6 +948,38 @@ const MTLPurgeableState = enum(c_ulong) {
empty = 4,
};
/// https://developer.apple.com/documentation/metal/mtlblendfactor?language=objc
const MTLBlendFactor = enum(c_ulong) {
zero = 0,
one = 1,
source_color = 2,
one_minus_source_color = 3,
source_alpha = 4,
one_minus_source_alpha = 5,
dest_color = 6,
one_minus_dest_color = 7,
dest_alpha = 8,
one_minus_dest_alpha = 9,
source_alpha_saturated = 10,
blend_color = 11,
one_minus_blend_color = 12,
blend_alpha = 13,
one_minus_blend_alpha = 14,
source_1_color = 15,
one_minus_source_1_color = 16,
source_1_alpha = 17,
one_minus_source_1_alpha = 18,
};
/// https://developer.apple.com/documentation/metal/mtlblendoperation?language=objc
const MTLBlendOperation = enum(c_ulong) {
add = 0,
subtract = 1,
reverse_subtract = 2,
min = 3,
max = 4,
};
/// https://developer.apple.com/documentation/metal/mtlresourceoptions?language=objc
/// (incomplete, we only use this mode so we just hardcode it)
const MTLResourceStorageModeShared: c_ulong = @enumToInt(MTLStorageMode.shared) << 4;