First installment of tech ENABLE_SHADERS_MANAGER, using class GLShadersManager as a central point to manage OpenGL shaders

src/slic3r/GUI/GLShadersManager.cpp

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+#include "libslic3r/libslic3r.h"
+#include "GLShadersManager.hpp"
+
+#include <cassert>
+#include <algorithm>
+
+#if ENABLE_SHADERS_MANAGER
+
+namespace Slic3r {
+
+std::pair<bool, std::string> GLShadersManager::init()
+{
+    std::string error;
+
+    auto append_shader = [this, &error](const std::string& name, const GLShaderProgram::ShaderFilenames& filenames) {
+        m_shaders.push_back(std::make_unique<GLShaderProgram>());
+        if (!m_shaders.back()->init_from_files(name, filenames)) {
+            error += name + "\n";
+            // if any error happens while initializating the shader, we remove it from the list
+            m_shaders.pop_back();
+            return false;
+        }
+        return true;
+    };
+
+    assert(m_shaders.empty());
+
+    bool valid = true;
+
+    // used to render bed axes, selection hints
+    valid &= append_shader("gouraud_light", { "gouraud_light.vs", "gouraud_light.fs" });
+    // used to render printbed
+    valid &= append_shader("printbed", { "printbed.vs", "printbed.fs" });
+    // used to render tool changes in gcode preview
+    valid &= append_shader("toolchanges", { "toolchanges.vs", "toolchanges.fs" });
+    // used to render color changes in gcode preview
+    valid &= append_shader("colorchanges", { "colorchanges.vs", "colorchanges.fs" });
+    // used to render pause prints in gcode preview
+    valid &= append_shader("pauses", { "pauses.vs", "pauses.fs" });
+    // used to render custom gcode points in gcode preview
+    valid &= append_shader("customs", { "customs.vs", "customs.fs" });
+    // used to render retractions in gcode preview
+    valid &= append_shader("retractions", { "retractions.vs", "retractions.fs" });
+    // used to render unretractions in gcode preview
+    valid &= append_shader("unretractions", { "unretractions.vs", "unretractions.fs" });
+    // used to render extrusion paths in gcode preview
+    valid &= append_shader("extrusions", { "extrusions.vs", "extrusions.fs" });
+    // used to render travel paths in gcode preview
+    valid &= append_shader("travels", { "travels.vs", "travels.fs" });
+    // used to render shells in gcode preview
+    valid &= append_shader("shells", { "shells.vs", "shells.fs" });
+    // used to render objects in 3d editor
+    valid &= append_shader("gouraud", { "gouraud.vs", "gouraud.fs" });
+    // used to render variable layers heights in 3d editor
+    valid &= append_shader("variable_layer_height", { "variable_layer_height.vs", "variable_layer_height.fs" });
+
+    return { valid, error };
+}
+
+void GLShadersManager::shutdown()
+{
+    for (std::unique_ptr<GLShaderProgram>& shader : m_shaders)
+    {
+        shader.reset();
+    }
+}
+
+GLShaderProgram* GLShadersManager::get_shader(const std::string& shader_name)
+{
+    auto it = std::find_if(m_shaders.begin(), m_shaders.end(), [shader_name](std::unique_ptr<GLShaderProgram>& p) { return p->get_name() == shader_name; });
+    return (it != m_shaders.end()) ? it->get() : nullptr;
+}
+
+} // namespace Slic3r
+
+#endif // ENABLE_SHADERS_MANAGER