Tech ENABLE_GLBEGIN_GLEND_REMOVAL - Background rendering

resources/shaders/background.fs

@@ -0,0 +1,11 @@
+#version 110
+
+uniform vec4 top_color;
+uniform vec4 bottom_color;
+
+varying vec2 tex_coord;
+
+void main()
+{
+    gl_FragColor = mix(bottom_color, top_color, tex_coord.y);
+}

resources/shaders/background.vs

@@ -0,0 +1,9 @@
+#version 110
+
+varying vec2 tex_coord;
+
+void main()
+{
+    gl_Position = gl_Vertex;
+	tex_coord = gl_MultiTexCoord0.xy;
+}

src/slic3r/GUI/GLCanvas3D.cpp

@@ -72,10 +72,17 @@
 
 static constexpr const float TRACKBALLSIZE = 0.8f;
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+static const Slic3r::ColorRGBA DEFAULT_BG_DARK_COLOR  = { 0.478f, 0.478f, 0.478f, 1.0f };
+static const Slic3r::ColorRGBA DEFAULT_BG_LIGHT_COLOR = { 0.753f, 0.753f, 0.753f, 1.0f };
+static const Slic3r::ColorRGBA ERROR_BG_DARK_COLOR    = { 0.478f, 0.192f, 0.039f, 1.0f };
+static const Slic3r::ColorRGBA ERROR_BG_LIGHT_COLOR   = { 0.753f, 0.192f, 0.039f, 1.0f };
+#else
 static const Slic3r::ColorRGB DEFAULT_BG_DARK_COLOR  = { 0.478f, 0.478f, 0.478f };
 static const Slic3r::ColorRGB DEFAULT_BG_LIGHT_COLOR = { 0.753f, 0.753f, 0.753f };
 static const Slic3r::ColorRGB ERROR_BG_DARK_COLOR    = { 0.478f, 0.192f, 0.039f };
 static const Slic3r::ColorRGB ERROR_BG_LIGHT_COLOR   = { 0.753f, 0.192f, 0.039f };
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
 // Number of floats
 static constexpr const size_t MAX_VERTEX_BUFFER_SIZE     = 131072 * 6; // 3.15MB
@@ -5197,7 +5204,7 @@ void GLCanvas3D::_rectangular_selection_picking_pass()
     _update_volumes_hover_state();
 }
 
-void GLCanvas3D::_render_background() const
+void GLCanvas3D::_render_background()
 {
     bool use_error_color = false;
     if (wxGetApp().is_editor()) {
@@ -5219,6 +5226,41 @@ void GLCanvas3D::_render_background() const
     // Draws a bottom to top gradient over the complete screen.
     glsafe(::glDisable(GL_DEPTH_TEST));
 
+#if ENABLE_GLBEGIN_GLEND_REMOVAL
+    const ColorRGBA bottom_color = use_error_color ? ERROR_BG_DARK_COLOR : DEFAULT_BG_DARK_COLOR;
+
+    if (!m_background.is_initialized() || m_background.get_color() != bottom_color) {
+        m_background.reset();
+
+        GLModel::Geometry init_data;
+        init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P2T2, GLModel::Geometry::EIndexType::USHORT };
+        init_data.color = bottom_color;
+        init_data.vertices.reserve(4 * GLModel::Geometry::vertex_stride_floats(init_data.format));
+        init_data.indices.reserve(6 * GLModel::Geometry::index_stride_bytes(init_data.format));
+
+        // vertices
+        init_data.add_vertex(Vec2f(-1.0f, -1.0f), Vec2f(0.0f, 0.0f));
+        init_data.add_vertex(Vec2f(1.0f, -1.0f),  Vec2f(1.0f, 0.0f));
+        init_data.add_vertex(Vec2f(1.0f, 1.0f),   Vec2f(1.0f, 1.0f));
+        init_data.add_vertex(Vec2f(-1.0f, 1.0f),  Vec2f(0.0f, 1.0f));
+
+        // indices
+        init_data.add_ushort_triangle(0, 1, 2);
+        init_data.add_ushort_triangle(2, 3, 0);
+
+        m_background.init_from(std::move(init_data));
+    }
+
+    GLShaderProgram* shader = wxGetApp().get_shader("background");
+    if (shader != nullptr) {
+        shader->start_using();
+        shader->set_uniform("top_color", use_error_color ? ERROR_BG_LIGHT_COLOR : DEFAULT_BG_LIGHT_COLOR);
+        shader->set_uniform("bottom_color", bottom_color);
+
+        m_background.render();
+        shader->stop_using();
+    }
+#else
     ::glBegin(GL_QUADS);
     ::glColor3fv(use_error_color ? ERROR_BG_DARK_COLOR.data(): DEFAULT_BG_DARK_COLOR.data());
     ::glVertex2f(-1.0f, -1.0f);
@@ -5228,6 +5270,7 @@ void GLCanvas3D::_render_background() const
     ::glVertex2f(1.0f, 1.0f);
     ::glVertex2f(-1.0f, 1.0f);
     glsafe(::glEnd());
+#endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
     glsafe(::glEnable(GL_DEPTH_TEST));
 

src/slic3r/GUI/GLCanvas3D.hpp

@@ -621,6 +621,7 @@ class GLCanvas3D
 
     CameraTarget m_camera_target;
 #endif // ENABLE_SHOW_CAMERA_TARGET
+    GLModel m_background;
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
 
 public:
@@ -932,7 +933,7 @@ class GLCanvas3D
 
     void _picking_pass();
     void _rectangular_selection_picking_pass();
-    void _render_background() const;
+    void _render_background();
     void _render_bed(bool bottom, bool show_axes);
     void _render_bed_for_picking(bool bottom);
     void _render_objects(GLVolumeCollection::ERenderType type);

src/slic3r/GUI/GLShadersManager.cpp

@@ -36,6 +36,8 @@ std::pair<bool, std::string> GLShadersManager::init()
 #if ENABLE_GLBEGIN_GLEND_REMOVAL
     // basic shader, used to render all what was previously rendered using the immediate mode
     valid &= append_shader("flat", { "flat.vs", "flat.fs" });
+    // used to render 3D scene background
+    valid &= append_shader("background", { "background.vs", "background.fs" });
 #endif // ENABLE_GLBEGIN_GLEND_REMOVAL
     // used to render bed axes and model, selection hints, gcode sequential view marker model, preview shells, options in gcode preview
     valid &= append_shader("gouraud_light", { "gouraud_light.vs", "gouraud_light.fs" });

src/slic3r/GUI/Gizmos/GLGizmoMove.cpp

@@ -256,7 +256,7 @@ void GLGizmoMove3D::render_grabber_extension(Axis axis, const BoundingBoxf3& box
     shader->start_using();
     shader->set_uniform("emission_factor", 0.1f);
 #else
-    const_cast<GLModel*>(&m_cone)->set_color(-1, (!picking && m_hover_id != -1) ? complementary(m_grabbers[axis].color) : m_grabbers[axis].color);
+    m_cone.set_color(-1, (!picking && m_hover_id != -1) ? complementary(m_grabbers[axis].color) : m_grabbers[axis].color);
     if (!picking) {
         shader->start_using();
         shader->set_uniform("emission_factor", 0.1f);