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https://github.com/RGBCube/serenity
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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`
41 lines
976 B
C++
41 lines
976 B
C++
/*
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* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibSoftGPU/StencilBuffer.h>
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namespace SoftGPU {
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ErrorOr<NonnullOwnPtr<StencilBuffer>> StencilBuffer::try_create(Gfx::IntSize const& size)
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{
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auto rect = Gfx::IntRect { 0, 0, size.width(), size.height() };
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auto data = TRY(FixedArray<u8>::try_create(size.area()));
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return adopt_own(*new StencilBuffer(rect, move(data)));
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}
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StencilBuffer::StencilBuffer(Gfx::IntRect const& rect, FixedArray<u8> data)
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: m_data(move(data))
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, m_rect(rect)
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{
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}
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void StencilBuffer::clear(Gfx::IntRect rect, u8 value)
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{
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rect.intersect(m_rect);
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for (int y = rect.top(); y <= rect.bottom(); ++y) {
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auto* line = scanline(y);
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for (int x = rect.left(); x <= rect.right(); ++x)
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line[x] = value;
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}
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}
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u8* StencilBuffer::scanline(int y)
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{
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VERIFY(m_rect.contains_vertically(y));
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return &m_data[y * m_rect.width()];
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}
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}
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