a9fc9b20da
Require that these structs have standard layout, which is what we need to pass them to OpenGL. Inheritence with data members violates the rules for standard layout so I re-implemented them using templates to share the code and putting all the data members in each struct. Change-Id: I19cd0e5518728f2d3e0993b17d15fce7be7e0edb
131 lines
3.6 KiB
C++
131 lines
3.6 KiB
C++
/*
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* Copyright (C) 2010 The Android Open Source Project
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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 ANDROID_HWUI_VERTEX_H
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#define ANDROID_HWUI_VERTEX_H
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#include "Vector.h"
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#include <type_traits>
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#define REQUIRE_COMPATIBLE_LAYOUT(TARGET_TYPE) \
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static_assert(std::is_standard_layout<TARGET_TYPE>::value, \
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#TARGET_TYPE " must have standard layout")
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namespace android {
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namespace uirenderer {
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/**
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* Simple structure to describe a vertex with a position and a texture.
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*/
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struct Vertex {
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/**
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* Fudge-factor used to disambiguate geometry pixel positioning.
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*
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* Used to offset lines and points to avoid ambiguous intersection with pixel centers (see
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* Program::set()), and used to make geometry damage rect calculation conservative (see
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* Rect::snapGeometryToPixelBoundaries())
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*/
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static float GeometryFudgeFactor() { return 0.0656f; }
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float x, y;
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static inline void set(Vertex* vertex, float x, float y) {
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vertex->x = x;
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vertex->y = y;
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}
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static inline void set(Vertex* vertex, Vector2 val) {
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set(vertex, val.x, val.y);
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}
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static inline void copyWithOffset(Vertex* vertex, const Vertex& src, float x, float y) {
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set(vertex, src.x + x, src.y + y);
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}
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}; // struct Vertex
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REQUIRE_COMPATIBLE_LAYOUT(Vertex);
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/**
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* Simple structure to describe a vertex with a position and texture UV.
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*/
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struct TextureVertex {
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float x, y;
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float u, v;
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static inline void set(TextureVertex* vertex, float x, float y, float u, float v) {
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*vertex = { x, y, u, v };
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}
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static inline void setUV(TextureVertex* vertex, float u, float v) {
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vertex[0].u = u;
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vertex[0].v = v;
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}
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}; // struct TextureVertex
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REQUIRE_COMPATIBLE_LAYOUT(TextureVertex);
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/**
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* Simple structure to describe a vertex with a position, texture UV and ARGB color.
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*/
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struct ColorTextureVertex {
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float x, y;
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float u, v;
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float r, g, b, a;
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static inline void set(ColorTextureVertex* vertex, float x, float y,
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float u, float v, int color) {
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float a = ((color >> 24) & 0xff) / 255.0f;
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float r = a * ((color >> 16) & 0xff) / 255.0f;
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float g = a * ((color >> 8) & 0xff) / 255.0f;
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float b = a * ((color) & 0xff) / 255.0f;
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*vertex = { x, y, u, v, r, g, b, a };
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}
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}; // struct ColorTextureVertex
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REQUIRE_COMPATIBLE_LAYOUT(ColorTextureVertex);
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/**
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* Simple structure to describe a vertex with a position and an alpha value.
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*/
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struct AlphaVertex {
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float x, y;
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float alpha;
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static inline void set(AlphaVertex* vertex, float x, float y, float alpha) {
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*vertex = { x, y, alpha };
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}
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static inline void copyWithOffset(AlphaVertex* vertex, const AlphaVertex& src,
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float x, float y) {
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AlphaVertex::set(vertex, src.x + x, src.y + y, src.alpha);
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}
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static inline void setColor(AlphaVertex* vertex, float alpha) {
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vertex[0].alpha = alpha;
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}
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}; // struct AlphaVertex
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REQUIRE_COMPATIBLE_LAYOUT(AlphaVertex);
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}; // namespace uirenderer
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}; // namespace android
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#endif // ANDROID_HWUI_VERTEX_H
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