Use a separate (simplified) shader for diffuseless models

src/engine/graphics/shader/shaders.cpp

@@ -51,15 +51,16 @@ extern char g_shaderFragmentColor[];
 extern char g_shaderFragmentDepth[];
 extern char g_shaderFragmentGUI[];
 extern char g_shaderFragmentText[];
-extern char g_shaderFragmentBlinnPhong[];
-extern char g_shaderFragmentPBR[];
 extern char g_shaderFragmentParticle[];
 extern char g_shaderFragmentGrass[];
+extern char g_shaderFragmentBlur[];
+extern char g_shaderFragmentPresentWorld[];
+extern char g_shaderFragmentBlinnPhong[];
+extern char g_shaderFragmentBlinnPhongTextureless[];
 extern char g_shaderFragmentIrradiance[];
 extern char g_shaderFragmentPrefilter[];
 extern char g_shaderFragmentBRDF[];
-extern char g_shaderFragmentBlur[];
-extern char g_shaderFragmentPresentWorld[];
+extern char g_shaderFragmentPBR[];
 
 static constexpr int kBindingPointIndexCombined = 1;
 static constexpr int kBindingPointIndexText = 2;
@@ -88,15 +89,16 @@ void Shaders::init() {
     initShader(ShaderName::FragmentDepth, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentDepth });
     initShader(ShaderName::FragmentGUI, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentGUI });
     initShader(ShaderName::FragmentText, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentText });
-    initShader(ShaderName::FragmentBlinnPhong, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderBaseModel, g_shaderFragmentBlinnPhong });
-    initShader(ShaderName::FragmentPBR, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderBasePBR, g_shaderBasePBRIBL, g_shaderBaseModel, g_shaderFragmentPBR });
     initShader(ShaderName::FragmentParticle, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentParticle });
     initShader(ShaderName::FragmentGrass, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentGrass });
+    initShader(ShaderName::FragmentBlur, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentBlur });
+    initShader(ShaderName::FragmentPresentWorld, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentPresentWorld });
+    initShader(ShaderName::FragmentBlinnPhong, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderBaseModel, g_shaderFragmentBlinnPhong });
+    initShader(ShaderName::FragmentBlinnPhongTextureless, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderBaseModel, g_shaderFragmentBlinnPhongTextureless });
     initShader(ShaderName::FragmentIrradiance, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentIrradiance });
     initShader(ShaderName::FragmentPrefilter, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderBasePBR, g_shaderBasePBRIBL, g_shaderFragmentPrefilter });
     initShader(ShaderName::FragmentBRDF, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderBasePBR, g_shaderBasePBRIBL, g_shaderFragmentBRDF });
-    initShader(ShaderName::FragmentBlur, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentBlur });
-    initShader(ShaderName::FragmentPresentWorld, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderFragmentPresentWorld });
+    initShader(ShaderName::FragmentPBR, GL_FRAGMENT_SHADER, { g_shaderBaseHeader, g_shaderBasePBR, g_shaderBasePBRIBL, g_shaderBaseModel, g_shaderFragmentPBR });
 
     initProgram(ShaderProgram::SimpleColor, { ShaderName::VertexSimple, ShaderName::FragmentColor });
     initProgram(ShaderProgram::SimpleDepth, { ShaderName::VertexSimple, ShaderName::GeometryDepth, ShaderName::FragmentDepth });
@@ -108,6 +110,7 @@ void Shaders::init() {
     initProgram(ShaderProgram::SimplePresentWorld, { ShaderName::VertexSimple, ShaderName::FragmentPresentWorld });
     initProgram(ShaderProgram::ModelColor, { ShaderName::VertexModel, ShaderName::FragmentColor });
     initProgram(ShaderProgram::ModelBlinnPhong, { ShaderName::VertexModel, ShaderName::FragmentBlinnPhong });
+    initProgram(ShaderProgram::ModelBlinnPhongTextureless, { ShaderName::VertexModel, ShaderName::FragmentBlinnPhongTextureless });
     initProgram(ShaderProgram::ModelPBR, { ShaderName::VertexModel, ShaderName::FragmentPBR });
     initProgram(ShaderProgram::ParticleParticle, { ShaderName::VertexParticle, ShaderName::FragmentParticle });
     initProgram(ShaderProgram::GrassGrass, { ShaderName::VertexGrass, ShaderName::FragmentGrass });

src/engine/graphics/shader/shaders.h

@@ -46,6 +46,7 @@ enum class ShaderProgram {
     SimplePresentWorld,
     ModelColor,
     ModelBlinnPhong,
+    ModelBlinnPhongTextureless,
     ModelPBR,
     ParticleParticle,
     GrassGrass,
@@ -224,6 +225,7 @@ public:
 
 private:
     enum class ShaderName {
+        // Common
         VertexSimple,
         VertexModel,
         VertexParticle,
@@ -235,15 +237,20 @@ private:
         FragmentDepth,
         FragmentGUI,
         FragmentText,
-        FragmentBlinnPhong,
-        FragmentPBR,
         FragmentParticle,
         FragmentGrass,
+        FragmentBlur,
+        FragmentPresentWorld,
+
+        // Blinn-Phong
+        FragmentBlinnPhong,
+        FragmentBlinnPhongTextureless,
+
+        // PBR
         FragmentIrradiance,
         FragmentPrefilter,
         FragmentBRDF,
-        FragmentBlur,
-        FragmentPresentWorld
+        FragmentPBR
     };
 
     bool _inited { false };

src/engine/graphics/shader/shaders_phong.cpp

@@ -28,14 +28,7 @@ namespace graphics {
 char g_shaderFragmentBlinnPhong[] = R"END(
 void main() {
     vec2 texCoords = fragTexCoords + uGeneral.uvOffset;
-
-    vec4 diffuseSample;
-    if (isFeatureEnabled(FEATURE_DIFFUSE)) {
-        diffuseSample = texture(uDiffuse, texCoords);
-    } else {
-        diffuseSample = vec4(vec3(0.5), 1.0);
-    }
-
+    vec4 diffuseSample = texture(uDiffuse, texCoords);
     vec3 cameraToFragment = uGeneral.cameraPosition.xyz - fragPosition;
     vec3 V = normalize(cameraToFragment);
 
@@ -111,6 +104,42 @@ void main() {
 }
 )END";
 
+char g_shaderFragmentBlinnPhongTextureless[] = R"END(
+void main() {
+    vec3 indirect = uGeneral.ambientColor.rgb * uMaterial.ambient.rgb;
+    vec3 direct = vec3(0.0);
+
+    if (isFeatureEnabled(FEATURE_LIGHTING)) {
+        vec3 V = normalize(uGeneral.cameraPosition.xyz - fragPosition);
+        vec3 N = normalize(fragNormal);
+
+        for (int i = 0; i < uLightCount; ++i) {
+            vec3 L = normalize(uLights[i].position.xyz - fragPosition);
+            vec3 H = normalize(V + L);
+
+            vec3 diff = uMaterial.diffuse.rgb * max(dot(L, N), 0.0);
+            vec3 diffuse = uLights[i].multiplier * uLights[i].color.rgb * diff;
+
+            float spec = uMaterial.specular * pow(max(dot(N, H), 0.0), uMaterial.shininess);
+            vec3 specular = uLights[i].multiplier * uLights[i].color.rgb * spec;
+
+            float attenuation = getLightAttenuation(i);
+            diffuse *= attenuation;
+            specular *= attenuation;
+
+            direct += diffuse + specular;
+        }
+    } else if (isFeatureEnabled(FEATURE_LIGHTMAP)) {
+        indirect *= texture(uLightmap, fragLightmapCoords).rgb;
+    }
+
+    vec3 objectColor = indirect + direct;
+
+    fragColor = vec4(objectColor, uGeneral.alpha);
+    fragColorBright = vec4(0.0);
+}
+)END";
+
 } // namespace graphics
 
 } // namespace reone

src/engine/scene/node/modelnodescenenode.cpp

@@ -241,7 +241,9 @@ void ModelNodeSceneNode::drawSingle(bool shadowPass) {
         program = ShaderProgram::SimpleDepth;
 
     } else {
-        program = isFeatureEnabled(Feature::PBR) ? ShaderProgram::ModelPBR : ShaderProgram::ModelBlinnPhong;
+        program = !_textures.diffuse ?
+            ShaderProgram::ModelBlinnPhongTextureless :
+            (isFeatureEnabled(Feature::PBR) ? ShaderProgram::ModelPBR : ShaderProgram::ModelBlinnPhong);
 
         if (_textures.diffuse) {
             uniforms.combined.featureMask |= UniformFeatureFlags::diffuse;