refactor export equirectangular

src/texture.cpp

@@ -5,6 +5,75 @@
 #include "app.h"
 
 std::map<uint16_t, Texture2D> TextureManager::m_textures;
+std::array<int, 6> TextureCube::m_faces_map {
+    GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, // front
+    GL_TEXTURE_CUBE_MAP_NEGATIVE_X, // right
+    GL_TEXTURE_CUBE_MAP_POSITIVE_Z, // back
+    GL_TEXTURE_CUBE_MAP_POSITIVE_X, // left
+    GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, // top
+    GL_TEXTURE_CUBE_MAP_POSITIVE_Y, // bottom
+};
+
+TextureCube::TextureCube(TextureCube&& other) noexcept
+{
+    other.m_faces = std::move(other.m_faces); 
+    m_cubetex_id = other.m_cubetex_id;      other.m_cubetex_id = 0;
+    m_resolution = other.m_resolution;      other.m_resolution = 0;
+}
+
+TextureCube::~TextureCube()
+{
+    destroy();
+}
+
+void TextureCube::operator=(TextureCube&& other) noexcept
+{
+    other.m_faces = std::move(other.m_faces);
+    m_cubetex_id = other.m_cubetex_id;      other.m_cubetex_id = 0;
+    m_resolution = other.m_resolution;      other.m_resolution = 0;
+}
+
+bool TextureCube::create(int resolution) noexcept
+{
+    App::I->render_task([this, resolution]
+    {
+        destroy();
+        m_resolution = resolution;
+        glGenTextures(1, &m_cubetex_id);
+
+        if (!m_cubetex_id)
+            return;
+
+        glBindTexture(GL_TEXTURE_CUBE_MAP, m_cubetex_id);
+        for (GLuint i = 0; i < 6; i++)
+        {
+            glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGBA8,
+                m_resolution, m_resolution, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
+        }
+    });
+    return m_cubetex_id != 0;
+}
+
+void TextureCube::destroy() noexcept
+{
+    if (m_cubetex_id)
+    {
+        App::I->render_task([f=m_faces, id=m_cubetex_id]
+        {
+            glDeleteTextures(f.size(), f.data());
+            glDeleteTextures(1, &id);
+        });
+        m_cubetex_id = 0;
+        m_faces.fill(0);
+        m_resolution = 0;
+    }
+}
+
+void TextureCube::bind() const noexcept
+{
+    assert(App::I->is_render_thread());
+    glBindTexture(GL_TEXTURE_CUBE_MAP, m_cubetex_id);
+}
 
 bool TextureManager::load(const char* path, bool generate_mipmaps)
 {
@@ -39,6 +108,18 @@ void TextureManager::invalidate()
     m_textures.clear();
 }
 
+Image Texture2D::get_image() const noexcept
+{
+    Image ret;
+    ret.create(m_width, m_height);
+    App::I->render_task([&]
+    {
+        bind();
+        glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, ret.m_data.get());
+    });
+    return ret;
+}
+
 bool Texture2D::create(int width, int height, GLint internal_format, GLint format, const uint8_t* data)
 {
     App::I->render_task([=]