66 lines
2.3 KiB
C++
66 lines
2.3 KiB
C++
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#pragma once
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#include "glclasses.hpp"
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#include <glm/vec2.hpp>
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// based on sources of knoc/chaqu
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namespace endofthejedi {
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/**
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* @brief This sprite struct stores all information needed to render an
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* arbitrary PNG texture to a quad.
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*
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* If the loaded texture dimensions have no powers of a bit more space is
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* allocated and extra padding is added.
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*/
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class ImageTexture {
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public:
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ImageTexture(const std::string &filename) : m_path(filename), m_valid(false)
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{
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}
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~ImageTexture()
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{
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}
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/**
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* @brief Try to load a PNG image from file into an opengl texture.
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*
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* @param path Path of PNG file
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* @param texture The used texture id will be saved there.
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* @param width Width of the loaded texture in pixels.
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* @param height Height of the loaded texture in pixels.
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* @param uv_scale_x Horizontal portion of the screen which is padded to get
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* power-of-two texture.
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* @param uv_scale_y Vertical portion of the screen which is padded to get
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* power-of-two texture.
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*
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* Note: The current active texture unit should be bound (GL_TEXTURE0 etc...)
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* before calling this
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*
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* @return true if loading suceeded, false on errors.
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*/
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bool loadPng();
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bool valid() const { return m_valid; }
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glm::vec2 size() const { return glm::vec2(m_width, m_height); }
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glm::vec2 uvScale() const { return glm::vec2(m_uv_scale_x, m_uv_scale_y); }
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GLuint textureId() const { return m_texture_id; }
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public:
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std::string m_path; // path for the loaded texture is saved here
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int m_width; // used width of the pixels of the texture
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int m_height; // used height of the pixels of the texture
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float m_uv_scale_x; // factor to scale uv-coordinates to get rid of non-power-of-two padding
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float m_uv_scale_y; // factor to scale uv-coordinates to get rid of non-power-of-two padding
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bool m_valid;
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GLuint m_texture_id; // texture binding id
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};
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}
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