✨ Add custom render properties

Author: PedroKlein

include/game/scene.hpp

@@ -47,6 +47,9 @@ class Scene {
 
         addObject(std::make_shared<Star>(Transform{glm::vec3(60.0f, -10.0f, -20.0f), glm::vec3(5.0f, 5.0f, 5.0f)}));
 
+        addObject(std::make_shared<Star>(Transform{glm::vec3(220.0f, -30.0f, 55.0f), glm::vec3(10.0f, 10.0f, 10.0f)},
+                                         glm::vec4(1.0f, 1.0f, 1.0f, 1.0f), 2.0e14f));
+
         initializePlatforms();
     }
 

include/graphics/renderer.hpp

@@ -5,6 +5,11 @@
 #include "graphics/mesh.hpp"
 #include "interpolatedTransform.hpp"
 
+struct CustomRenderProperties {
+    std::unordered_map<std::string, float> floatProperties;
+    std::unordered_map<std::string, glm::vec3> vec3Properties;
+};
+
 class Renderer final : public Component {
 public:
     std::shared_ptr<Mesh> mesh;
@@ -18,7 +23,14 @@ class Renderer final : public Component {
 
     void update(float alpha) override;
 
+    void applyCustomProperties();
+
+    void setCustomFloatProperty(const std::string &name, float value);
+
+    void setCustomVec3Property(const std::string &name, const glm::vec3 &value);
+
 private:
     float offset;
     glm::vec4 *offsetOrientation;
+    CustomRenderProperties customProperties;
 };

include/objects/star.hpp

@@ -19,8 +19,12 @@ class Star : public GameObject {
 
         addComponent(std::make_shared<RigidBody>(mass));
 
-        addComponent(std::make_shared<Renderer>(MeshManager::getInstance().getMesh("resources/models/sphere.obj"),
-                                                MaterialManager::getInstance().getMaterial(materialName)));
+        auto renderer = std::make_shared<Renderer>(MeshManager::getInstance().getMesh("resources/models/sphere.obj"),
+                                                   MaterialManager::getInstance().getMaterial(materialName));
+
+        addComponent(renderer);
+
+        renderer->setCustomVec3Property("starColor", color);
 
         addComponent(std::make_shared<LightEmitter>(color, 1.0f, 1.0e-2f, 2.0e-3f));
 

resources/shaders/star.frag

@@ -14,9 +14,11 @@ float noise(vec3 pos) {
     return fract(sin(t) * 43758.5453);
 }
 
+uniform vec3 starColor;
+
 void main() {
     float intensity = noise(normalize(FragPos) * time);
-    vec3 color = vec3(1.0, 0.0, 0.0) * intensity;
+    vec3 color = starColor * intensity;
 
     float dist = length(FragPos - viewPos);
     float corona = exp(-dist * 10.0) * intensity;

src/renderer.cpp

@@ -27,5 +27,24 @@ void Renderer::update(const float alpha) {
     }
 
     material->shader->setMat4("model", interpolatedTransform->getInterpolatedModelMatrix());
+    applyCustomProperties();
     mesh->draw(*material);
 }
+
+void Renderer::applyCustomProperties() {
+    for (const auto &[name, value]: customProperties.floatProperties) {
+        material->shader->setFloat(name, value);
+    }
+
+    for (const auto &[name, value]: customProperties.vec3Properties) {
+        material->shader->setVec3(name, value);
+    }
+}
+
+void Renderer::setCustomFloatProperty(const std::string &name, float value) {
+    customProperties.floatProperties[name] = value;
+}
+
+void Renderer::setCustomVec3Property(const std::string &name, const glm::vec3 &value) {
+    customProperties.vec3Properties[name] = value;
+}