(semi)fixes

shaders/star_vert.glsl

@@ -1,4 +1,4 @@
-// star_frag.glsl
+// star_vert.glsl
 //
 // Copyright (C) 2023-present, the Celestia Development Team
 // Original rendering algorithm by Askaniy Anpilogov <[email protected]>
@@ -9,6 +9,8 @@
 // as published by the Free Software Foundation; either version 2
 // of the License, or (at your option) any later version.
 
+const float a = 0.123; // empirical constant
+
 const float degree_per_px = 0.01; // higher value causes blinking due to optimizations in the psf_glow()
 const float max_square_size = 256.0; // px
 const float max_irradiation = pow((degree_per_px * max_square_size / a), 2.0) / (2.0 * 3.141592653);

src/celengine/render.cpp

@@ -1645,7 +1645,7 @@ static void renderSphereUnlit(const RenderInfo& ri,
         textures.push_back(ri.overlayTex);
     }
     if (ri.isStar)
-        shadprop.lightModel = ShaderProperties::StarModel;
+        shadprop.lightModel = LightingModel::StarModel;
 
     // Get a shader for the current rendering configuration
     auto* prog = r->getShaderManager().getShader(shadprop);
@@ -2791,12 +2791,14 @@ void Renderer::renderPlanet(Body& body,
     {
         if (float maxCoeff = body.getSurface().color.toVector3().maxCoeff(); maxCoeff > 0.0f) // ignore [ 0 0 0 ]; used by old addons to make objects not get rendered as point
         {
+#if 0
             renderObjectAsPoint(pos,
                                 body.getRadius(),
                                 appMag,
                                 discSizeInPixels,
                                 body.getSurface().color * (1.0f / maxCoeff), // normalize point color; 'darkness' is handled by size of point determined by GeomAlbedo.
                                 false, false, m);
+#endif
         }
     }
 }
@@ -2851,13 +2853,15 @@ void Renderer::renderStar(const Star& star,
                      rp, LightingState(), m);
     }
 
+#if 0
     renderObjectAsPoint(pos,
                         star.getRadius(),
                         appMag,
                         discSizeInPixels,
                         color,
                         star.hasCorona(), true,
                         m);
+#endif
 }
 
 
@@ -3166,7 +3170,7 @@ void Renderer::buildRenderLists(const Vector3d& astrocentricObserverPos,
             // Compute the irradiance
             // Instead of summing the reflected light from all nearby stars,
             // we just consider the one with the highest irradiance.
-            float irradiance = 1.175494e-38f; // minimum positive float value
+            float irradiance = std::numeric_limits<float>::min();
             for (const auto &lightSource : lightSourceList)
             {
                 Eigen::Vector3d sunPos = pos_v - lightSource.position;
@@ -3183,7 +3187,7 @@ void Renderer::buildRenderLists(const Vector3d& astrocentricObserverPos,
                 rle.position = pos_v.cast<float>();
                 rle.distance = (float) dist_v;
                 rle.centerZ = pos_v.cast<float>().dot(viewMatZ);
-                rle.irradiation = irradiation;
+                rle.irradiation = irradiance;
                 rle.discSizeInPixels = body->getRadius() / ((float) dist_v * pixelSize);
 
                 // TODO: Remove this. It's only used in two places: for calculating comet tail
@@ -3625,11 +3629,6 @@ void Renderer::renderStars(const StarDatabase& starDB,
 
     starRenderer.starVertexBuffer->finish();
     StarVertexBuffer::disable();
-
-#ifndef GL_ES
-    if (toggleAA)
-        enableMSAA();
-#endif
 }
 
 void Renderer::renderDeepSkyObjects(const Universe& universe,

src/celengine/renderinfo.h

@@ -23,7 +23,6 @@ class Texture;
 struct RenderInfo
 {
     Eigen::Quaternionf orientation{ Eigen::Quaternionf::Identity() };
-    Color color{ 1.0f, 1.0f, 1.0f };
     Texture* baseTex{ nullptr };
     Texture* bumpTex{ nullptr };
     Texture* nightTex{ nullptr };

src/celengine/shadermanager.cpp

@@ -2094,7 +2094,7 @@ ShaderManager::buildFragmentShader(const ShaderProperties& props)
     }
 
     // Include the effect of limb darkening.
-    if (props.lightModel == ShaderProperties::StarModel)
+    if (props.lightModel == LightingModel::StarModel)
     {
         source += "gl_FragColor.rgb = gl_FragColor.rgb - vec3(1.0 - NV) * vec3(0.56, 0.61, 0.72);\n";
     }

src/celestia/celestiacore.cpp

@@ -1467,15 +1467,19 @@ void CelestiaCore::charEntered(const char *c_p, int modifiers)
         break;
 
     case '[':
-        setExposure(sim->getExposure() * 0.5);
-        auto buf = fmt::format(loc, _("Exposure time: {:.2f}"), sim->getExposure());
-        flash(buf);
+        {
+            setExposure(sim->getExposure() * 0.5);
+            auto buf = fmt::format(loc, _("Exposure time: {:.2f}"), sim->getExposure());
+            flash(buf);
+        }
         break;
 
     case ']':
-        setExposure(sim->getExposure() * 2.0);
-        auto buf = fmt::format(loc, _("Exposure time: {:.2f}"), sim->getExposure());
-        flash(buf);
+        {
+            setExposure(sim->getExposure() * 2.0);
+            auto buf = fmt::format(loc, _("Exposure time: {:.2f}"), sim->getExposure());
+            flash(buf);
+        }
         break;
 
     case '\\':
@@ -2459,7 +2463,7 @@ bool CelestiaCore::initSimulation(const fs::path& configFileName,
     set_or_unset(interactionFlags, InteractionFlags::FocusZooming, config->mouse.focusZooming);
 
     sim = new Simulation(universe);
-    sim->setExposure(config->renderDetails.Exposure);
+    sim->setExposure(config->renderDetails.exposure);
 
     viewManager = std::make_unique<ViewManager>(new View(View::ViewWindow, sim->getActiveObserver(), 0.0f, 0.0f, 1.0f, 1.0f));