83 lines
2.2 KiB
C++
83 lines
2.2 KiB
C++
#include "Texture.h"
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#include <GL/glew.h>
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#include <stdexcept>
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#include <memory>
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#include "ImageData.h"
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#include "gl_util.h"
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Texture::Texture(uint id, uint width, uint height)
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: id(id), width(width), height(height) {
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}
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Texture::Texture(ubyte* data, uint width, uint height, ImageFormat imageFormat)
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: width(width), height(height) {
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glGenTextures(1, &id);
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glBindTexture(GL_TEXTURE_2D, id);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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GLenum format = gl::to_gl_format(imageFormat);
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glTexImage2D(
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GL_TEXTURE_2D, 0, format, width, height, 0,
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format, GL_UNSIGNED_BYTE, (GLvoid *) data
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);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glGenerateMipmap(GL_TEXTURE_2D);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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Texture::~Texture() {
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glDeleteTextures(1, &id);
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}
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void Texture::bind(){
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glBindTexture(GL_TEXTURE_2D, id);
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}
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void Texture::unbind() {
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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void Texture::reload(ubyte* data){
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glBindTexture(GL_TEXTURE_2D, id);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, (GLvoid *) data);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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ImageData* Texture::readData() {
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std::unique_ptr<ubyte[]> data (new ubyte[width * height * 4]);
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glBindTexture(GL_TEXTURE_2D, id);
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glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, data.get());
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glBindTexture(GL_TEXTURE_2D, 0);
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return new ImageData(ImageFormat::rgba8888, width, height, data.release());
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}
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void Texture::setNearestFilter() {
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bind();
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glBindTexture(GL_TEXTURE_2D, 0);
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}
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Texture* Texture::from(const ImageData* image) {
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uint width = image->getWidth();
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uint height = image->getHeight();
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const void* data = image->getData();
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return new Texture((ubyte*)data, width, height, image->getFormat());
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}
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uint Texture::getWidth() const {
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return width;
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}
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uint Texture::getHeight() const {
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return height;
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}
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uint Texture::getId() const {
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return id;
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}
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