add support for high res brush textures, implement mipmaps on brush

engine/texture.cpp

@@ -5,12 +5,15 @@
 
 std::map<uint16_t, Texture2D> TextureManager::m_textures;
 
-bool TextureManager::load(const char* path)
+bool TextureManager::load(const char* path, bool generate_mipmaps)
 {
     uint16_t id = const_hash(path);
     if (m_textures.count(id) == 0 || !m_textures[id].ready())
     {
-        return m_textures[id].load(path);
+        if (!m_textures[id].load(path))
+            return false;
+        if (generate_mipmaps)
+            m_textures[id].create_mipmaps();
     }
     return true;
 }
@@ -54,6 +57,13 @@ bool Texture2D::create(const ui::Image& img)
     return create(img.width, img.height, iformats[img.comp - 1], formats[img.comp - 1], img.data());
 }
 
+void Texture2D::create_mipmaps()
+{
+    bind();
+    glGenerateMipmap(GL_TEXTURE_2D);
+    unbind();
+}
+
 void Texture2D::assign(GLuint tex, int w/* = -1*/, int h/* = -1*/, GLuint internal_format/* = GL_RGBA8*/, GLuint format/* = GL_RGBA*/)
 {
     m_tex = tex;
@@ -102,6 +112,13 @@ void Sampler::set(GLint filter /*= GL_LINEAR*/, GLint wrap /*= GL_CLAMP_TO_EDGE*
     glSamplerParameteri(id, GL_TEXTURE_MAG_FILTER, filter);
 #endif // USE_SAMPLER
 }
+void Sampler::set_filter(GLint filter_min, GLint filter_mag)
+{
+#if USE_SAMPLER
+    glSamplerParameteri(id, GL_TEXTURE_MIN_FILTER, filter_min);
+    glSamplerParameteri(id, GL_TEXTURE_MAG_FILTER, filter_mag);
+#endif // USE_SAMPLER
+}
 void Sampler::bind(int unit)
 {
     current_unit = unit;