1st installment of tech ENABLE_ENVIRONMENT_MAP

resources/shaders/gouraud.fs

@@ -17,6 +17,9 @@ struct SlopeDetection
 uniform vec4 uniform_color;
 uniform SlopeDetection slope;
 
+uniform sampler2D environment_tex;
+uniform bool use_environment_tex;
+
 varying vec3 clipping_planes_dots;
 
 // x = tainted, y = specular;
@@ -26,6 +29,7 @@ varying vec3 delta_box_min;
 varying vec3 delta_box_max;
 
 varying float world_normal_z;
+varying vec3 eye_normal;
 
 vec3 slope_color()
 {
@@ -40,5 +44,8 @@ void main()
 	vec3 color = slope.actived ? slope_color() : uniform_color.rgb;
     // if the fragment is outside the print volume -> use darker color
 	color = (any(lessThan(delta_box_min, ZERO)) || any(greaterThan(delta_box_max, ZERO))) ? mix(color, ZERO, 0.3333) : color;
-    gl_FragColor = vec4(vec3(intensity.y, intensity.y, intensity.y) + color * intensity.x, uniform_color.a);
+    if (use_environment_tex)
+        gl_FragColor = vec4(0.45 * texture2D(environment_tex, normalize(eye_normal).xy * 0.5 + 0.5).xyz + 0.8 * color * intensity.x, uniform_color.a);
+    else
+        gl_FragColor = vec4(vec3(intensity.y) + color * intensity.x, uniform_color.a);
 }

resources/shaders/gouraud.vs

@@ -51,22 +51,23 @@ varying vec3 delta_box_max;
 varying vec3 clipping_planes_dots;
 
 varying float world_normal_z;
+varying vec3 eye_normal;
 
 void main()
 {
     // First transform the normal into camera space and normalize the result.
-    vec3 normal = normalize(gl_NormalMatrix * gl_Normal);
+    eye_normal = normalize(gl_NormalMatrix * gl_Normal);
     
     // Compute the cos of the angle between the normal and lights direction. The light is directional so the direction is constant for every vertex.
     // Since these two are normalized the cosine is the dot product. We also need to clamp the result to the [0,1] range.
-    float NdotL = max(dot(normal, LIGHT_TOP_DIR), 0.0);
+    float NdotL = max(dot(eye_normal, LIGHT_TOP_DIR), 0.0);
 
     intensity.x = INTENSITY_AMBIENT + NdotL * LIGHT_TOP_DIFFUSE;
     vec3 position = (gl_ModelViewMatrix * gl_Vertex).xyz;
-    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position), reflect(-LIGHT_TOP_DIR, normal)), 0.0), LIGHT_TOP_SHININESS);
+    intensity.y = LIGHT_TOP_SPECULAR * pow(max(dot(-normalize(position), reflect(-LIGHT_TOP_DIR, eye_normal)), 0.0), LIGHT_TOP_SHININESS);
 
     // Perform the same lighting calculation for the 2nd light source (no specular applied).
-    NdotL = max(dot(normal, LIGHT_FRONT_DIR), 0.0);
+    NdotL = max(dot(eye_normal, LIGHT_FRONT_DIR), 0.0);
     intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
 
     // compute deltas for out of print volume detection (world coordinates)

src/libslic3r/Technologies.hpp

@@ -42,5 +42,8 @@
 // Enable rendering of objects colored by facets' slope
 #define ENABLE_SLOPE_RENDERING (1 && ENABLE_2_3_0_ALPHA1)
 
+// Enable rendering of objects using environment map
+#define ENABLE_ENVIRONMENT_MAP (1 && ENABLE_2_3_0_ALPHA1)
+
 
 #endif // _prusaslicer_technologies_h_

src/slic3r/GUI/3DScene.cpp

@@ -1,6 +1,11 @@
 #include <GL/glew.h>
 
 #include "3DScene.hpp"
+#if ENABLE_ENVIRONMENT_MAP
+#include "GUI_App.hpp"
+#include "Plater.hpp"
+#include "AppConfig.hpp"
+#endif // ENABLE_ENVIRONMENT_MAP
 
 #include "libslic3r/ExtrusionEntity.hpp"
 #include "libslic3r/ExtrusionEntityCollection.hpp"
@@ -663,6 +668,10 @@ void GLVolumeCollection::render(GLVolumeCollection::ERenderType type, bool disab
     GLint slope_normal_matrix_id = (current_program_id > 0) ? ::glGetUniformLocation(current_program_id, "slope.volume_world_normal_matrix") : -1;
     GLint slope_z_range_id = (current_program_id > 0) ? ::glGetUniformLocation(current_program_id, "slope.z_range") : -1;
 #endif // ENABLE_SLOPE_RENDERING
+
+#if ENABLE_ENVIRONMENT_MAP
+    GLint use_environment_tex_id = (current_program_id > 0) ? ::glGetUniformLocation(current_program_id, "use_environment_tex") : -1;
+#endif // ENABLE_ENVIRONMENT_MAP
     glcheck();
 
     if (print_box_min_id != -1)
@@ -682,6 +691,18 @@ void GLVolumeCollection::render(GLVolumeCollection::ERenderType type, bool disab
         glsafe(::glUniform2fv(slope_z_range_id, 1, (const GLfloat*)m_slope.z_range.data()));
 #endif // ENABLE_SLOPE_RENDERING
 
+#if ENABLE_ENVIRONMENT_MAP
+    unsigned int environment_texture_id = GUI::wxGetApp().plater()->get_environment_texture_id();
+    bool use_environment_texture = current_program_id > 0 && environment_texture_id > 0 && GUI::wxGetApp().app_config->get("use_environment_map") == "1";
+
+    if (use_environment_tex_id != -1)
+    {
+        glsafe(::glUniform1i(use_environment_tex_id, use_environment_texture ? 1 : 0));
+        if (use_environment_texture)
+            glsafe(::glBindTexture(GL_TEXTURE_2D, environment_texture_id));
+    }
+#endif // ENABLE_ENVIRONMENT_MAP
+
     GLVolumeWithIdAndZList to_render = volumes_to_render(this->volumes, type, view_matrix, filter_func);
     for (GLVolumeWithIdAndZ& volume : to_render) {
         volume.first->set_render_color();
@@ -712,6 +733,11 @@ void GLVolumeCollection::render(GLVolumeCollection::ERenderType type, bool disab
 #endif // ENABLE_SLOPE_RENDERING
     }
 
+#if ENABLE_ENVIRONMENT_MAP
+    if (use_environment_tex_id != -1 && use_environment_texture)
+        glsafe(::glBindTexture(GL_TEXTURE_2D, 0));
+#endif // ENABLE_ENVIRONMENT_MAP
+
     glsafe(::glBindBuffer(GL_ARRAY_BUFFER, 0));
     glsafe(::glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0));
 

src/slic3r/GUI/AppConfig.cpp

@@ -93,6 +93,11 @@ void AppConfig::set_defaults()
     if (get("use_free_camera").empty())
         set("use_free_camera", "0");
 
+#if ENABLE_ENVIRONMENT_MAP
+    if (get("use_environment_map").empty())
+        set("use_environment_map", "0");
+#endif // ENABLE_ENVIRONMENT_MAP
+
     // Remove legacy window positions/sizes
     erase("", "main_frame_maximized");
     erase("", "main_frame_pos");

src/slic3r/GUI/GLCanvas3D.cpp

@@ -1994,6 +1994,10 @@ void GLCanvas3D::render()
         return;
     }
 
+#if ENABLE_ENVIRONMENT_MAP
+    wxGetApp().plater()->init_environment_texture();
+#endif // ENABLE_ENVIRONMENT_MAP
+
     const Size& cnv_size = get_canvas_size();
     // Probably due to different order of events on Linux/GTK2, when one switched from 3D scene
     // to preview, this was called before canvas had its final size. It reported zero width

src/slic3r/GUI/Plater.cpp

@@ -1583,6 +1583,9 @@ struct Plater::priv
     Sidebar *sidebar;
     Bed3D bed;
     Camera camera;
+#if ENABLE_ENVIRONMENT_MAP
+    GLTexture environment_texture;
+#endif // ENABLE_ENVIRONMENT_MAP
     Mouse3DController mouse3d_controller;
     View3D* view3D;
     GLToolbar view_toolbar;
@@ -2078,7 +2081,6 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
     });
 	wxGetApp().other_instance_message_handler()->init(this->q);
 
-
     // collapse sidebar according to saved value
     bool is_collapsed = wxGetApp().app_config->get("collapsed_sidebar") == "1";
     sidebar->collapse(is_collapsed);
@@ -5531,6 +5533,19 @@ Camera& Plater::get_camera()
     return p->camera;
 }
 
+#if ENABLE_ENVIRONMENT_MAP
+void Plater::init_environment_texture()
+{
+    if (p->environment_texture.get_id() == 0)
+        p->environment_texture.load_from_file(resources_dir() + "/icons/Pmetal_001.png", false, GLTexture::SingleThreaded, false);
+}
+
+unsigned int Plater::get_environment_texture_id() const
+{
+    return p->environment_texture.get_id();
+}
+#endif // ENABLE_ENVIRONMENT_MAP
+
 const Bed3D& Plater::get_bed() const
 {
     return p->bed;

src/slic3r/GUI/Plater.hpp

@@ -319,6 +319,11 @@ public:
     const Camera& get_camera() const;
     Camera& get_camera();
 
+#if ENABLE_ENVIRONMENT_MAP
+    void init_environment_texture();
+    unsigned int get_environment_texture_id() const;
+#endif // ENABLE_ENVIRONMENT_MAP
+
     const Bed3D& get_bed() const;
     Bed3D& get_bed();
 

src/slic3r/GUI/Preferences.cpp

@@ -180,10 +180,28 @@ void PreferencesDialog::build()
 
 	create_settings_mode_widget();
 
+#if ENABLE_ENVIRONMENT_MAP
+	m_optgroup_render = std::make_shared<ConfigOptionsGroup>(this, _(L("Render")));
+	m_optgroup_render->label_width = 40;
+	m_optgroup_render->m_on_change = [this](t_config_option_key opt_key, boost::any value) {
+		m_values[opt_key] = boost::any_cast<bool>(value) ? "1" : "0";
+	};
+
+	def.label = L("Use environment map");
+	def.type = coBool;
+	def.tooltip = L("If enabled, renders object using the environment map.");
+	def.set_default_value(new ConfigOptionBool{ app_config->get("use_environment_map") == "1" });
+	option = Option(def, "use_environment_map");
+	m_optgroup_render->append_single_option_line(option);
+#endif // ENABLE_ENVIRONMENT_MAP
+
 	auto sizer = new wxBoxSizer(wxVERTICAL);
 	sizer->Add(m_optgroup_general->sizer, 0, wxEXPAND | wxBOTTOM | wxLEFT | wxRIGHT, 10);
 	sizer->Add(m_optgroup_camera->sizer, 0, wxEXPAND | wxBOTTOM | wxLEFT | wxRIGHT, 10);
 	sizer->Add(m_optgroup_gui->sizer, 0, wxEXPAND | wxBOTTOM | wxLEFT | wxRIGHT, 10);
+#if ENABLE_ENVIRONMENT_MAP
+	sizer->Add(m_optgroup_render->sizer, 0, wxEXPAND | wxBOTTOM | wxLEFT | wxRIGHT, 10);
+#endif // ENABLE_ENVIRONMENT_MAP
 
     SetFont(wxGetApp().normal_font());