From 86e15013d04b9ccdff97a81ee28fc60c4848a17e Mon Sep 17 00:00:00 2001
From: sebastian <mail@sebastian.boeckelmann.de>
Date: Sun, 2 Aug 2026 09:26:55 +0200
Subject: [PATCH] ADD: Load Material to shader

---
 assets/models/chess_blue.png              | Bin 0 -> 367 bytes
 assets/shaders/basic.frag                 |   4 +++-
 engine/src/loader/models/Model.cpp        |   7 ++++++-
 engine/src/loader/models/Model.h          |   4 +++-
 engine/src/renderer/MeshRenderer.cpp      |   6 +++++-
 engine/src/renderer/shader/StaticShader.h |  12 ++++++++++--
 6 files changed, 27 insertions(+), 6 deletions(-)
 create mode 100644 assets/models/chess_blue.png

diff --git a/assets/models/chess_blue.png b/assets/models/chess_blue.png
new file mode 100644
index 0000000000000000000000000000000000000000..fb0b75ed962c8ff9095ff6ce2c719536749777ed
GIT binary patch
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literal 0
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diff --git a/assets/shaders/basic.frag b/assets/shaders/basic.frag
index dd4314c..8143310 100644
--- a/assets/shaders/basic.frag
+++ b/assets/shaders/basic.frag
@@ -3,8 +3,10 @@
 in vec2 pass_textureCoords;
 
 uniform sampler2D textureSampler;
+uniform float opacity;
 out vec4 fragColor;
 
 void main() {
-    fragColor = texture(textureSampler, pass_textureCoords);
+    vec4 texColor = texture(textureSampler, pass_textureCoords);
+    fragColor = vec4(texColor.rgb, texColor.a * opacity);
 }
\ No newline at end of file
diff --git a/engine/src/loader/models/Model.cpp b/engine/src/loader/models/Model.cpp
index a0de1c0..ed681f3 100644
--- a/engine/src/loader/models/Model.cpp
+++ b/engine/src/loader/models/Model.cpp
@@ -49,4 +49,9 @@ void Model::drawSection(const std::string& name) const {
     glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(it->indexCount), GL_UNSIGNED_INT,
                     reinterpret_cast<const void*>(it->indexOffset * sizeof(unsigned int)));
     unbind();
-}
\ No newline at end of file
+}
+
+void Model::drawSectionRange(unsigned int indexOffset, unsigned int indexCount) const {
+    glDrawElements(GL_TRIANGLES, static_cast<GLsizei>(indexCount), GL_UNSIGNED_INT,
+                    reinterpret_cast<const void*>(indexOffset * sizeof(unsigned int)));
+}
diff --git a/engine/src/loader/models/Model.h b/engine/src/loader/models/Model.h
index 9299324..6d7896c 100644
--- a/engine/src/loader/models/Model.h
+++ b/engine/src/loader/models/Model.h
@@ -20,11 +20,13 @@ namespace engine {
         void bind() const;
         void unbind() const;
         void draw() const;
-        void drawSection(const std::string& name) const; // neu
+        void drawSection(const std::string& name) const;
+        void drawSectionRange(unsigned int indexOffset, unsigned int indexCount) const;
 
         [[nodiscard]] int getVertexCount() const { return m_vertexCount; }
         [[nodiscard]] bool isIndexed() const { return m_isIndexed; }
         [[nodiscard]] bool hasSections() const { return !m_sections.empty(); }
+        [[nodiscard]] const std::vector<MeshSection>& getSections() const { return m_sections; }
 
     private:
         std::unique_ptr<Vao> m_vao;
diff --git a/engine/src/renderer/MeshRenderer.cpp b/engine/src/renderer/MeshRenderer.cpp
index 03cb4bd..aff1fdb 100644
--- a/engine/src/renderer/MeshRenderer.cpp
+++ b/engine/src/renderer/MeshRenderer.cpp
@@ -13,7 +13,11 @@ void engine::MeshRenderer::render(RenderQueue &queue, const Camera &camera) {
         m_shader->loadTransformationMatrix(transformationMatrix);
 
         mesh->bind();
-        mesh->draw();
+        for (const auto& section : mesh->getSections()) {
+            m_shader->loadMaterial(*section.material);
+            section.material->bind();
+            mesh->drawSectionRange(section.indexOffset, section.indexCount);
+        }
         mesh->unbind();
     }
 
diff --git a/engine/src/renderer/shader/StaticShader.h b/engine/src/renderer/shader/StaticShader.h
index 3e2c3a2..067ce6a 100644
--- a/engine/src/renderer/shader/StaticShader.h
+++ b/engine/src/renderer/shader/StaticShader.h
@@ -6,6 +6,7 @@
 #define COLORRACE_STATICSHADER_H
 #include <functional>
 
+#include "loader/models/Material.h"
 #include "utils/openglWrapper/shader/ShaderProgram.h"
 #include "utils/openglWrapper/shader/UniformValue.h"
 
@@ -17,7 +18,8 @@ namespace engine {
             storeAllUniformLocations({
                 std::ref(transformationMatrix),
                 std::ref(projectionMatrix),
-                std::ref(viewMatrix)
+                std::ref(viewMatrix),
+                std::ref(opacity)
             });
         };
 
@@ -32,11 +34,17 @@ namespace engine {
         void loadViewMatrix(const glm::mat4& matrix) {
             viewMatrix.load(matrix);
         }
+
+        void loadMaterial(const Material& material) {
+            //shininess.load(material.getShininess());
+            opacity.load(material.getOpacity());
+        }
     private:
         engine::UniformValue<glm::mat4> transformationMatrix{"transformationMatrix"};
         engine::UniformValue<glm::mat4> projectionMatrix{"projectionMatrix"};
         engine::UniformValue<glm::mat4> viewMatrix{"viewMatrix"};
-
+        engine::UniformValue<float> shininess{"shininess"};
+        engine::UniformValue<float> opacity{"opacity"};
     };
 }