Enable HDR lighting with Reinhard tonemapping across all world shaders

Replace hardcoded specular multipliers with uLightColor * uSpecularIntensity
uniforms in all 4 world shaders (terrain, WMO, M2, character), set HDR sun
color (1.5, 1.4, 1.3) and specular intensity 0.5 so highlights can exceed
1.0, and switch the post-process pass from passthrough to exposure-compensated
Reinhard (exposure=1.8) for soft highlight roll-off without clipping.

assets/shaders/terrain.frag

@@ -32,6 +32,9 @@ uniform vec3 uAmbientColor;
 // Camera
 uniform vec3 uViewPos;
 
+// HDR specular
+uniform float uSpecularIntensity;
+
 // Fog
 uniform vec3 uFogColor;
 uniform float uFogStart;
@@ -79,7 +82,7 @@ void main() {
     vec3 viewDir = normalize(uViewPos - FragPos);
     vec3 halfwayDir = normalize(lightDir + viewDir);
     float spec = pow(max(dot(norm, halfwayDir), 0.0), 32.0);
-    vec3 specular = spec * uLightColor * 0.1;
+    vec3 specular = spec * uLightColor * uSpecularIntensity;
 
     // Combine lighting
     vec3 result = ambient + diffuse + specular;

src/rendering/character_renderer.cpp

@@ -90,6 +90,8 @@ bool CharacterRenderer::initialize() {
 
         uniform sampler2D uTexture0;
         uniform vec3 uLightDir;
+        uniform vec3 uLightColor;
+        uniform float uSpecularIntensity;
         uniform vec3 uViewPos;
 
         uniform vec3 uFogColor;
@@ -113,7 +115,7 @@ bool CharacterRenderer::initialize() {
             vec3 viewDir = normalize(uViewPos - FragPos);
             vec3 halfDir = normalize(lightDir + viewDir);
             float spec = pow(max(dot(normal, halfDir), 0.0), 32.0);
-            vec3 specular = spec * vec3(0.2);
+            vec3 specular = spec * uLightColor * uSpecularIntensity;
 
             // Shadow mapping
             float shadow = 1.0;
@@ -1016,6 +1018,8 @@ void CharacterRenderer::render(const Camera& camera, const glm::mat4& view, cons
     characterShader->setUniform("uView", view);
     characterShader->setUniform("uProjection", projection);
     characterShader->setUniform("uLightDir", glm::vec3(0.0f, -1.0f, 0.3f));
+    characterShader->setUniform("uLightColor", glm::vec3(1.5f, 1.4f, 1.3f));
+    characterShader->setUniform("uSpecularIntensity", 0.5f);
     characterShader->setUniform("uViewPos", camera.getPosition());
 
     // Fog

src/rendering/m2_renderer.cpp

@@ -253,6 +253,8 @@ bool M2Renderer::initialize(pipeline::AssetManager* assets) {
         in vec2 TexCoord;
 
         uniform vec3 uLightDir;
+        uniform vec3 uLightColor;
+        uniform float uSpecularIntensity;
         uniform vec3 uAmbientColor;
         uniform vec3 uViewPos;
         uniform sampler2D uTexture;
@@ -299,7 +301,7 @@ bool M2Renderer::initialize(pipeline::AssetManager* assets) {
             vec3 viewDir = normalize(uViewPos - FragPos);
             vec3 halfDir = normalize(lightDir + viewDir);
             float spec = pow(max(dot(normal, halfDir), 0.0), 32.0);
-            vec3 specular = spec * vec3(0.1);
+            vec3 specular = spec * uLightColor * uSpecularIntensity;
 
             // Shadow mapping
             float shadow = 1.0;
@@ -1117,6 +1119,8 @@ void M2Renderer::render(const Camera& camera, const glm::mat4& view, const glm::
     shader->setUniform("uView", view);
     shader->setUniform("uProjection", projection);
     shader->setUniform("uLightDir", lightDir);
+    shader->setUniform("uLightColor", glm::vec3(1.5f, 1.4f, 1.3f));
+    shader->setUniform("uSpecularIntensity", 0.5f);
     shader->setUniform("uAmbientColor", ambientColor);
     shader->setUniform("uViewPos", camera.getPosition());
     shader->setUniform("uFogColor", fogColor);

src/rendering/renderer.cpp

@@ -1176,8 +1176,10 @@ void Renderer::initPostProcess(int w, int h) {
         out vec4 FragColor;
         void main() {
             vec3 color = texture(uScene, vUV).rgb;
-            // Passthrough — tonemap will kick in once HDR lighting is added
-            FragColor = vec4(color, 1.0);
+            float exposure = 1.8;
+            color *= exposure;
+            vec3 mapped = color / (color + vec3(1.0));
+            FragColor = vec4(mapped, 1.0);
         }
     )";
     postProcessShader = std::make_unique<Shader>();

src/rendering/terrain_renderer.cpp

@@ -324,6 +324,7 @@ void TerrainRenderer::render(const Camera& camera) {
     // Set lighting
     shader->setUniform("uLightDir", glm::vec3(lightDir[0], lightDir[1], lightDir[2]));
     shader->setUniform("uLightColor", glm::vec3(lightColor[0], lightColor[1], lightColor[2]));
+    shader->setUniform("uSpecularIntensity", 0.5f);
     shader->setUniform("uAmbientColor", glm::vec3(ambientColor[0], ambientColor[1], ambientColor[2]));
 
     // Set camera position

src/rendering/wmo_renderer.cpp

@@ -74,6 +74,8 @@ bool WMORenderer::initialize(pipeline::AssetManager* assets) {
         in vec4 VertexColor;
 
         uniform vec3 uLightDir;
+        uniform vec3 uLightColor;
+        uniform float uSpecularIntensity;
         uniform vec3 uViewPos;
         uniform vec3 uAmbientColor;
         uniform sampler2D uTexture;
@@ -105,7 +107,7 @@ bool WMORenderer::initialize(pipeline::AssetManager* assets) {
             vec3 viewDir = normalize(uViewPos - FragPos);
             vec3 halfDir = normalize(lightDir + viewDir);
             float spec = pow(max(dot(normal, halfDir), 0.0), 32.0);
-            vec3 specular = spec * vec3(0.15);
+            vec3 specular = spec * uLightColor * uSpecularIntensity;
 
             // Sample texture or use vertex color
             vec4 texColor;
@@ -490,6 +492,8 @@ void WMORenderer::render(const Camera& camera, const glm::mat4& view, const glm:
     shader->setUniform("uProjection", projection);
     shader->setUniform("uViewPos", camera.getPosition());
     shader->setUniform("uLightDir", glm::vec3(-0.3f, -0.7f, -0.6f));  // Default sun direction
+    shader->setUniform("uLightColor", glm::vec3(1.5f, 1.4f, 1.3f));
+    shader->setUniform("uSpecularIntensity", 0.5f);
     shader->setUniform("uAmbientColor", glm::vec3(0.4f, 0.4f, 0.5f));
     shader->setUniform("uFogColor", fogColor);
     shader->setUniform("uFogStart", fogStart);