69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
#pragma once
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#include "hd2d/GL.h"
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#include <glm/glm.hpp>
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#include <string>
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#include <vector>
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namespace hd2d {
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struct Image {
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int width = 0, height = 0;
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std::vector<unsigned char> rgba; // row 0 = bottom (GL convention)
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};
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// Loads an RGBA8 image flipped to GL orientation. Colors of fully transparent
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// pixels are replaced with their nearest opaque neighbour so that filtering
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// never bleeds dark fringes into sprite edges.
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bool loadImage(const std::string& path, Image& out);
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// Decodes PNG bytes from memory. glTF images use flipY = false (their UV
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// origin is top-left, which matches GL when rows are uploaded unflipped).
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bool decodeImage(const unsigned char* data, size_t size, Image& out, bool flipY);
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// sRGB pixel-art texture. Sampled with "sharp bilinear" in shaders, so it uses
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// linear filtering with mipmaps rather than GL_NEAREST.
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class Texture {
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public:
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Texture() = default;
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Texture(const Texture&) = delete;
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Texture& operator=(const Texture&) = delete;
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Texture(Texture&& o) noexcept { *this = std::move(o); }
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Texture& operator=(Texture&& o) noexcept;
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~Texture();
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bool load(const std::string& path, bool repeat = false);
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bool create(const Image& image, bool repeat = false, float anisotropy = 1.0f);
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void bind(GLuint unit) const { glBindTextureUnit(unit, id_); }
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GLuint id() const { return id_; }
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glm::ivec2 size() const { return {width_, height_}; }
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// UV-space rectangle (minX, minY, maxX, maxY) of pixels with alpha >= 128.
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// Billboards use minY to plant the visible feet on the ground.
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glm::vec4 opaqueBounds() const { return opaqueBounds_; }
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private:
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GLuint id_ = 0;
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int width_ = 0, height_ = 0;
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glm::vec4 opaqueBounds_{0, 0, 1, 1};
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};
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// 2D array of equally sized sRGB layers (terrain materials).
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class TextureArray {
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public:
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TextureArray() = default;
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TextureArray(const TextureArray&) = delete;
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TextureArray& operator=(const TextureArray&) = delete;
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~TextureArray();
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bool load(const std::vector<std::string>& paths);
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void bind(GLuint unit) const { glBindTextureUnit(unit, id_); }
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glm::ivec2 size() const { return {width_, height_}; }
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int layers() const { return layers_; }
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private:
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GLuint id_ = 0;
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int width_ = 0, height_ = 0, layers_ = 0;
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};
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} // namespace hd2d
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