Add a TransparencyProgramExtension

Used to force transparency to 20% in Materials.
Mainly used for debug purpose (to see what in inside an object).

assets/shaders/base/fullMaterialFS.frag

-// SPDX-FileCopyrightText: Copyright (c) 2020 CRIStAL/PIRVI. All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2020-2025 CRIStAL/PIRVI. All rights reserved.
 // SPDX-FileCopyrightText: Copyright (c) 2020 Paul-Elian Tabarant
-// SPDX-FileCopyrightText: Copyright (c) 2020 Samuel Degrande
+// SPDX-FileCopyrightText: Copyright (c) 2020-2025 Samuel Degrande
 // SPDX-FileCopyrightText: Copyright (c) 2020 Stevens Jourdain
 // SPDX-License-Identifier: BSD-3-Clause
 
 #version 420 core
 
+// @define placeholder@
+
 //////////////////// UNIFORM ////////////////////
 uniform vec3 Ambient;
 uniform vec4 LightColor[8];
@@ -46,7 +48,8 @@ in VertexData
 	vec3 TangentLightPos[8];
 	vec3 TangentViewPos;
 	vec3 TangentFragPos;
-}fs_in;
+}
+fs_in;
 
 //////////////////// CONST ////////////////////
 
@@ -122,8 +125,7 @@ void main()
 	// DISPLACEMENT_TEX
 	if (hasMaterialMap.hasDisplacement > 0.5f) {
 		texCoords = ParallaxMapping(viewDir);
-		if (texCoords.x > 1.0 || texCoords.y > 1.0 || texCoords.x < 0.0 || texCoords.y < 0.0)
-			discard;
+		if (texCoords.x > 1.0 || texCoords.y > 1.0 || texCoords.x < 0.0 || texCoords.y < 0.0) discard;
 	}
 	// -
 
@@ -139,8 +141,7 @@ void main()
 	float alpha = 1.0;
 	if (hasMaterialMap.hasOpacity > 0.5f) {
 		alpha = texture(material.opacityMap, texCoords).r;
-		if (alpha == 0.0)
-			discard;
+		if (alpha == 0.0) discard;
 	} else {
 		alpha = material.opacity;
 	}
@@ -150,8 +151,7 @@ void main()
 	ambient = Ambient * material.ambient.rgb * texture(material.ambientMap, texCoords).rgb;
 	// -
 	// AMBIENTOCCLUSION_TEX
-	if (hasMaterialMap.hasLightmap > 0.5f)
-		ambient *= texture(material.lightMap, texCoords).r;
+	if (hasMaterialMap.hasLightmap > 0.5f) ambient *= texture(material.lightMap, texCoords).r;
 	// -
 
 	// Multiple lights (Phong shading)
@@ -175,6 +175,9 @@ void main()
 
 	// Set lights
 	vec4 totalColor = vec4((ambient + diffuseSum + specularSum), alpha);
+#if FORCE_TRANSPARENCY
+	totalColor.a = 0.8;
+#endif
 
 	// Clamp
 	FragColor = clamp(totalColor, 0.0, 1.0);

assets/shaders/base/materialFS.frag

-// SPDX-FileCopyrightText: Copyright (c) 2016-2024 CRIStAL/PIRVI. All rights reserved.
-// SPDX-FileCopyrightText: Copyright (c) 2016-2024 Samuel Degrande
+// SPDX-FileCopyrightText: Copyright (c) 2016-2025 CRIStAL/PIRVI. All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2016-2025 Samuel Degrande
 // SPDX-FileCopyrightText: Copyright (c) 2019 Paul-Elian Tabarant
 // SPDX-FileCopyrightText: Copyright (c) 2020 Stevens Jourdain
 // SPDX-License-Identifier: BSD-3-Clause
 
 #version 420 core
 
+// @define placeholder@
+
 //////////////////// UNIFORM ////////////////////
 
 // Builtins
@@ -53,7 +55,8 @@ in VertexData
 	vec3 Position;
 	vec3 Normal;
 	vec2 TexCoord;
-} fs_in;
+}
+fs_in;
 
 //////////////////// OUT ////////////////////
 
@@ -96,6 +99,9 @@ void main()
 
 	// Set lights
 	vec4 totalColor = vec4(vec3(ambient + diffuseSum + specularSum), material.opacity);
+#if FORCE_TRANSPARENCY
+	totalColor.a = 0.8;
+#endif
 
 	// Clamp
 	FragColor = clamp(totalColor, 0.0, 1.0);

assets/shaders/base/materialMapFS.frag

-// SPDX-FileCopyrightText: Copyright (c) 2020-2024 CRIStAL/PIRVI. All rights reserved.
+// SPDX-FileCopyrightText: Copyright (c) 2020-2025 CRIStAL/PIRVI. All rights reserved.
 // SPDX-FileCopyrightText: Copyright (c) 2020 Stevens Jourdain
-// SPDX-FileCopyrightText: Copyright (c) 2020-2024 Samuel Degrande
+// SPDX-FileCopyrightText: Copyright (c) 2020-2025 Samuel Degrande
 // SPDX-License-Identifier: BSD-3-Clause
 
 #version 420 core
 
+// @define placeholder@
+
 //////////////////// UNIFORM ////////////////////
 
 uniform mat4 ModelMat;
@@ -37,7 +39,8 @@ in VertexData
 	vec3 Position;
 	vec3 Normal;
 	vec2 TexCoord;
-} fs_in;
+}
+fs_in;
 
 //////////////////// OUT ////////////////////
 
@@ -55,7 +58,8 @@ void computeLight(int lightIndex, vec3 position, vec3 norm, out vec3 diffuse, ou
 	vec3 viewDir = normalize(vec3(ViewPos) - position);
 	vec3 reflectDir = reflect(-s, n);
 	float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
-	specular = material.shininessStrength * spec * LightColor[lightIndex].rgb * texture(material.specular, fs_in.TexCoord).rgb;
+	specular =
+		material.shininessStrength * spec * LightColor[lightIndex].rgb * texture(material.specular, fs_in.TexCoord).rgb;
 }
 
 void main()
@@ -76,7 +80,9 @@ void main()
 
 	// Set lights
 	vec4 totalColor = vec4(vec3(ambient + diffuseSum + specularSum), material.opacity);
-
+#if FORCE_TRANSPARENCY
+	totalColor.a = 0.8;
+#endif
 	// Clamp
 	FragColor = clamp(totalColor, 0.0, 1.0);
 }

assets/shaders/base/materialTexturedFS.frag

@@ -101,14 +101,9 @@ void main()
 	// Set lights
 	vec4 totalColor =
 		vec4(vec3(ambient + diffuseSum + specularSum), 1.0) * texture(material.diffuseMap, fs_in.TexCoord);
-
+#if FORCE_TRANSPARENCY
+	totalColor.a = 0.8;
+#endif
 	// Clamp
-#if RED
-	FragColor = vec4(1, 0, 0, 1);
-#else
 	FragColor = clamp(totalColor, 0.0, 1.0);
-#endif
-#if BLUE
-	FragColor.b = 1.0;
-#endif
 }

src/Renderer/ProgramExtension.cpp

@@ -74,3 +74,17 @@ void SkeletonProgramExtension::extensionSetUniforms(GLuint programID, Renderer*
 {
 	glProgramUniformMatrix4fv(programID, boneMatsID, 32, GL_FALSE, glm::value_ptr(boneMats[0]));
 }
+
+//=============================================================================
+
+TransparencyProgramExtension::TransparencyProgramExtension()
+{
+	std::string config = R"({ "fragment" : { "defines" : { "FORCE_TRANSPARENCY" : 1 } } })";
+	programConf = jsonFromString(config);
+}
+
+void TransparencyProgramExtension::extensionGetUniformsID(GLuint programID) {}
+
+void TransparencyProgramExtension::extensionSetUniforms(GLuint programID, Renderer* renderer,
+                                                        const glm::mat4& modelMat) const
+{}

src/Renderer/ProgramExtension.hpp

@@ -71,4 +71,15 @@ private:
 	GLint boneMatsID {};
 };
 
+class TransparencyProgramExtension : public ProgramExtension
+{
+public:
+	TransparencyProgramExtension();
+	~TransparencyProgramExtension() override = default;
+
+protected:
+	void extensionGetUniformsID(GLuint programID) override;
+	void extensionSetUniforms(GLuint programID, Renderer* renderer, const glm::mat4& modelMat) const override;
+};
+
 #endif    // SRC_RENDERER_PROGRAMEXTENSION_HPP_