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| 1 | +/** |
| 2 | + * Copyright(c) Live2D Inc. All rights reserved. |
| 3 | + * |
| 4 | + * Use of this source code is governed by the Live2D Open Software license |
| 5 | + * that can be found at https://www.live2d.com/eula/live2d-open-software-license-agreement_en.html. |
| 6 | + */ |
| 7 | + |
| 8 | +#if !defined CSM_ALPHA_BLEND_MODE |
| 9 | +#error not define symbol: CSM_ALPHA_BLEND_MODE. |
| 10 | + |
| 11 | +#else |
| 12 | +vec4 OverlapRgba(vec3 color, vec3 colorSource, vec3 colorDestination, vec3 parameter) |
| 13 | +{ |
| 14 | + vec3 rgb = color * parameter.x + colorSource * parameter.y + colorDestination * parameter.z; |
| 15 | + float alpha = parameter.x + parameter.y + parameter.z; |
| 16 | + return vec4(rgb, alpha); |
| 17 | +} |
| 18 | + |
| 19 | +#if CSM_ALPHA_BLEND_MODE == 0 // OVER |
| 20 | +vec4 AlphaBlend(vec3 color, vec4 colorSource, vec4 colorDestination) |
| 21 | +{ |
| 22 | + vec3 parameter = vec3(colorSource.a * colorDestination.a, colorSource.a * (1.0 - colorDestination.a), colorDestination.a * (1.0 - colorSource.a)); |
| 23 | + return OverlapRgba(color, colorSource.rgb, colorDestination.rgb, parameter); |
| 24 | +} |
| 25 | + |
| 26 | +#elif CSM_ALPHA_BLEND_MODE == 1 // ATOP |
| 27 | +vec4 AlphaBlend(vec3 color, vec4 colorSource, vec4 colorDestination) |
| 28 | +{ |
| 29 | + vec3 parameter = vec3(colorSource.a * colorDestination.a, 0, colorDestination.a * (1.0 - colorSource.a)); |
| 30 | + return OverlapRgba(color, colorSource.rgb, colorDestination.rgb, parameter); |
| 31 | +} |
| 32 | + |
| 33 | +#elif CSM_ALPHA_BLEND_MODE == 2 // OUT |
| 34 | +vec4 AlphaBlend(vec3 color, vec4 colorSource, vec4 colorDestination) |
| 35 | +{ |
| 36 | + vec3 parameter = vec3(0.0, 0.0, colorDestination.a * (1.0 - colorSource.a)); |
| 37 | + return OverlapRgba(color, colorSource.rgb, colorDestination.rgb, parameter); |
| 38 | +} |
| 39 | + |
| 40 | +#elif CSM_ALPHA_BLEND_MODE == 3 // CONJOINT OVER |
| 41 | +vec4 AlphaBlend(vec3 color, vec4 colorSource, vec4 colorDestination) |
| 42 | +{ |
| 43 | + vec3 parameter = vec3(min(colorSource.a, colorDestination.a), max(colorSource.a - colorDestination.a, 0.0), max(colorDestination.a - colorSource.a, 0.0)); |
| 44 | + return OverlapRgba(color, colorSource.rgb, colorDestination.rgb, parameter); |
| 45 | +} |
| 46 | + |
| 47 | +#elif CSM_ALPHA_BLEND_MODE == 4 // DISJOINT OVER |
| 48 | +vec4 AlphaBlend(vec3 color, vec4 colorSource, vec4 colorDestination) |
| 49 | +{ |
| 50 | + vec3 parameter = vec3(max(colorSource.a + colorDestination.a - 1.0, 0.0), min(colorSource.a, 1.0 - colorDestination.a), min(colorDestination.a, 1.0 - colorSource.a)); |
| 51 | + return OverlapRgba(color, colorSource.rgb, colorDestination.rgb, parameter); |
| 52 | +} |
| 53 | + |
| 54 | +#else |
| 55 | +#error not supported blend function |
| 56 | + |
| 57 | +#endif |
| 58 | +#endif |
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