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11c807ebd1
This implements an 8-bit front stencil buffer. Stencil operations are SIMD optimized. LibGL changes include: * New `glStencilMask` and `glStencilMaskSeparate` functions * New context parameter `GL_STENCIL_CLEAR_VALUE`
160 lines
3.8 KiB
C++
160 lines
3.8 KiB
C++
/*
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* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/SIMD.h>
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// Functions returning vectors or accepting vector arguments have different calling conventions
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// depending on whether the target architecture supports SSE or not. GCC generates warning "psabi"
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// when compiling for non-SSE architectures. We disable this warning because these functions
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// are static and should never be visible from outside the translation unit that includes this header.
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wpsabi"
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namespace AK::SIMD {
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// SIMD Vector Expansion
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ALWAYS_INLINE static constexpr f32x4 expand4(float f)
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{
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return f32x4 { f, f, f, f };
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}
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ALWAYS_INLINE static constexpr i32x4 expand4(i32 i)
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{
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return i32x4 { i, i, i, i };
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}
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ALWAYS_INLINE static constexpr u32x4 expand4(u32 u)
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{
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return u32x4 { u, u, u, u };
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}
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// Casting
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template<typename TSrc>
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ALWAYS_INLINE static u32x4 to_u32x4(TSrc v)
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{
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return __builtin_convertvector(v, u32x4);
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}
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template<typename TSrc>
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ALWAYS_INLINE static i32x4 to_i32x4(TSrc v)
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{
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return __builtin_convertvector(v, i32x4);
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}
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template<typename TSrc>
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ALWAYS_INLINE static f32x4 to_f32x4(TSrc v)
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{
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return __builtin_convertvector(v, f32x4);
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}
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// Masking
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ALWAYS_INLINE static i32 maskbits(i32x4 mask)
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{
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#if defined(__SSE__)
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return __builtin_ia32_movmskps((f32x4)mask);
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#else
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return ((mask[0] & 0x80000000) >> 31) | ((mask[1] & 0x80000000) >> 30) | ((mask[2] & 0x80000000) >> 29) | ((mask[3] & 0x80000000) >> 28);
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#endif
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}
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ALWAYS_INLINE static bool all(i32x4 mask)
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{
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return maskbits(mask) == 15;
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}
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ALWAYS_INLINE static bool any(i32x4 mask)
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{
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return maskbits(mask) != 0;
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}
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ALWAYS_INLINE static bool none(i32x4 mask)
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{
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return maskbits(mask) == 0;
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}
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ALWAYS_INLINE static int maskcount(i32x4 mask)
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{
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constexpr static int count_lut[16] { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 };
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return count_lut[maskbits(mask)];
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}
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// Load / Store
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ALWAYS_INLINE static f32x4 load4(float const* a, float const* b, float const* c, float const* d)
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{
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return f32x4 { *a, *b, *c, *d };
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}
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ALWAYS_INLINE static u32x4 load4(u32 const* a, u32 const* b, u32 const* c, u32 const* d)
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{
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return u32x4 { *a, *b, *c, *d };
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}
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ALWAYS_INLINE static f32x4 load4_masked(float const* a, float const* b, float const* c, float const* d, i32x4 mask)
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{
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int bits = maskbits(mask);
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return f32x4 {
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bits & 1 ? *a : 0.f,
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bits & 2 ? *b : 0.f,
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bits & 4 ? *c : 0.f,
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bits & 8 ? *d : 0.f,
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};
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}
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ALWAYS_INLINE static i32x4 load4_masked(u8 const* a, u8 const* b, u8 const* c, u8 const* d, i32x4 mask)
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{
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int bits = maskbits(mask);
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return i32x4 {
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bits & 1 ? *a : 0,
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bits & 2 ? *b : 0,
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bits & 4 ? *c : 0,
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bits & 8 ? *d : 0,
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};
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}
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ALWAYS_INLINE static u32x4 load4_masked(u32 const* a, u32 const* b, u32 const* c, u32 const* d, i32x4 mask)
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{
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int bits = maskbits(mask);
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return u32x4 {
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bits & 1 ? *a : 0u,
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bits & 2 ? *b : 0u,
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bits & 4 ? *c : 0u,
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bits & 8 ? *d : 0u,
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};
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}
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template<typename VectorType, typename UnderlyingType = decltype(declval<VectorType>()[0])>
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ALWAYS_INLINE static void store4(VectorType v, UnderlyingType* a, UnderlyingType* b, UnderlyingType* c, UnderlyingType* d)
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{
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*a = v[0];
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*b = v[1];
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*c = v[2];
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*d = v[3];
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}
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template<typename VectorType, typename UnderlyingType = decltype(declval<VectorType>()[0])>
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ALWAYS_INLINE static void store4_masked(VectorType v, UnderlyingType* a, UnderlyingType* b, UnderlyingType* c, UnderlyingType* d, i32x4 mask)
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{
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int bits = maskbits(mask);
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if (bits & 1)
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*a = v[0];
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if (bits & 2)
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*b = v[1];
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if (bits & 4)
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*c = v[2];
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if (bits & 8)
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*d = v[3];
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}
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}
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#pragma GCC diagnostic pop
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