107 lines
2.5 KiB
C++
107 lines
2.5 KiB
C++
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/*
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* Copyright 2015-2017 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SPIRV_CROSS_SAMPLER_HPP
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#define SPIRV_CROSS_SAMPLER_HPP
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#include <vector>
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namespace spirv_cross
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{
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struct spirv_cross_sampler_2d
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{
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inline virtual ~spirv_cross_sampler_2d()
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{
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}
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};
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template <typename T>
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struct sampler2DBase : spirv_cross_sampler_2d
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{
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sampler2DBase(const spirv_cross_sampler_info *info)
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{
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mips.insert(mips.end(), info->mipmaps, info->mipmaps + info->num_mipmaps);
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format = info->format;
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wrap_s = info->wrap_s;
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wrap_t = info->wrap_t;
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min_filter = info->min_filter;
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mag_filter = info->mag_filter;
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mip_filter = info->mip_filter;
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}
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inline virtual T sample(glm::vec2 uv, float bias)
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{
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return sampleLod(uv, bias);
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}
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inline virtual T sampleLod(glm::vec2 uv, float lod)
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{
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if (mag_filter == SPIRV_CROSS_FILTER_NEAREST)
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{
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uv.x = wrap(uv.x, wrap_s, mips[0].width);
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uv.y = wrap(uv.y, wrap_t, mips[0].height);
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glm::vec2 uv_full = uv * glm::vec2(mips[0].width, mips[0].height);
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int x = int(uv_full.x);
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int y = int(uv_full.y);
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return sample(x, y, 0);
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}
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else
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{
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return T(0, 0, 0, 1);
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}
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}
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inline float wrap(float v, spirv_cross_wrap wrap, unsigned size)
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{
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switch (wrap)
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{
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case SPIRV_CROSS_WRAP_REPEAT:
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return v - glm::floor(v);
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case SPIRV_CROSS_WRAP_CLAMP_TO_EDGE:
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{
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float half = 0.5f / size;
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return glm::clamp(v, half, 1.0f - half);
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}
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default:
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return 0.0f;
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}
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}
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std::vector<spirv_cross_miplevel> mips;
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spirv_cross_format format;
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spirv_cross_wrap wrap_s;
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spirv_cross_wrap wrap_t;
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spirv_cross_filter min_filter;
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spirv_cross_filter mag_filter;
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spirv_cross_mipfilter mip_filter;
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};
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typedef sampler2DBase<glm::vec4> sampler2D;
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typedef sampler2DBase<glm::ivec4> isampler2D;
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typedef sampler2DBase<glm::uvec4> usampler2D;
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template <typename T>
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inline T texture(const sampler2DBase<T> &samp, const glm::vec2 &uv, float bias = 0.0f)
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{
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return samp.sample(uv, bias);
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}
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}
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#endif
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