ADD: Render Textures

.idea/editor.xml

@@ -17,7 +17,7 @@
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppBoostFormatTooManyArgs/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppCStyleCast/@EntryIndexedValue" value="SUGGESTION" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppCVQualifierCanNotBeAppliedToReference/@EntryIndexedValue" value="WARNING" type="string" />
-    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassCanBeFinal/@EntryIndexedValue" value="DO_NOT_SHOW" type="string" />
+    <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassCanBeFinal/@EntryIndexedValue" value="HINT" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassIsIncomplete/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassNeedsConstructorBecauseOfUninitializedMember/@EntryIndexedValue" value="WARNING" type="string" />
     <option name="/Default/CodeInspection/Highlighting/InspectionSeverities/=CppClassNeverUsed/@EntryIndexedValue" value="WARNING" type="string" />

CMakeLists.txt

@@ -26,8 +26,8 @@ add_executable(Dicewars_Siedler src/main.cpp
         src/game/DicewarsApp.h
         src/engine/renderer/model/RawModel.cpp
         src/engine/renderer/model/RawModel.h
-        src/engine/renderer/model/Loader.cpp
-        src/engine/renderer/model/Loader.h
+        src/engine/renderer/loader/Loader.cpp
+        src/engine/renderer/loader/Loader.h
         src/engine/renderer/Renderer.cpp
         src/engine/renderer/Renderer.h
         src/engine/layer/Layer.cpp
@@ -37,11 +37,19 @@ add_executable(Dicewars_Siedler src/main.cpp
         src/engine/renderer/shaders/ShaderProgram.cpp
         src/engine/renderer/shaders/ShaderProgram.h
         src/engine/renderer/shaders/StaticShader.cpp
-        src/engine/renderer/shaders/StaticShader.h)
+        src/engine/renderer/shaders/StaticShader.h
+        src/engine/renderer/loader/Texture2D.h
+        src/engine/renderer/loader/TextureLoader.cpp
+        src/engine/renderer/loader/TextureLoader.h
+        src/engine/renderer/textures/ModelTexture.cpp
+        src/engine/renderer/textures/ModelTexture.h
+        src/engine/renderer/model/TexturedModel.cpp
+        src/engine/renderer/model/TexturedModel.h)
 
 target_include_directories(Dicewars_Siedler PRIVATE
     lib/glfw/include
         lib/glm
+        lib/stb_image
 )
 
 target_link_libraries(Dicewars_Siedler

assets/shaders/fragmentShader.glsl

@@ -1,9 +1,11 @@
 #version 400 core
 
-in vec3 color;
+in vec2 pass_textureCoords;
 
 out vec4 outColor;
 
+uniform sampler2D textureSampler;
+
 void main(void) {
-    outColor = vec4(color, 1.0f);
+    outColor = texture(textureSampler, pass_textureCoords);
 }

assets/shaders/vertexShader.glsl

@@ -1,11 +1,12 @@
 #version 400 core
 
 in vec3 position;
+in vec2 textureCoords;
 
-out vec3 color;
+out vec2 pass_textureCoords;
 
 void main()
 {
     gl_Position = vec4(position, 1.0);
-    color = vec3(position.x + 0.5, 1.0, position.y + 0.5);
+    pass_textureCoords = textureCoords;
 }

src/engine/layer/GameLayer.cpp

@@ -5,8 +5,10 @@
 #include "GameLayer.h"
 
 #include "../renderer/Renderer.h"
+#include "../renderer/model/TexturedModel.h"
+#include "../renderer/textures/ModelTexture.h"
 
-GameLayer::GameLayer() :model(0,0) //Platzhalter, echtes Model kommt in onAttach
+GameLayer::GameLayer() :texturedModel(0,0) //Platzhalter, echtes Model kommt in onAttach
 {
 }
 
@@ -24,7 +26,16 @@ void GameLayer::onAttach()
         3,1,2
     };
 
-    model = loader.loadToVAO(vertices, indices);
+    std::vector<float> textureCoords = {
+        0,0, //v0
+        0,1, // v1
+        1,1, // v2
+        1,0 //v3
+    };
+
+    RawModel model = loader.loadToVAO(vertices, textureCoords, indices);
+    ModelTexture texture = ModelTexture(loader.loadTexture("assets/textures/texture.png"));
+    texturedModel = TexturedModel(std::make_shared<RawModel>(model), std::make_shared<ModelTexture>(texture));
 }
 
 void GameLayer::onDetach()
@@ -34,7 +45,7 @@ void GameLayer::onDetach()
 
 void GameLayer::onUpdate()
 {
-    renderer.renderFrame(model);
+    renderer.renderFrame(texturedModel);
 }
 
 

src/engine/layer/GameLayer.h

@@ -6,7 +6,8 @@
 #define DICEWARS_SIEDLER_GAMELAYER_H
 #include "Layer.h"
 #include "../renderer/Renderer.h"
-#include "../renderer/model/Loader.h"
+#include "../renderer/loader/Loader.h"
+#include "../renderer/model/TexturedModel.h"
 
 
 class GameLayer: public Layer {
@@ -20,7 +21,7 @@ public:
 
 private:
     Loader loader;
-    RawModel model;
+    TexturedModel texturedModel;
     Renderer renderer;
 };
 

src/engine/renderer/Renderer.cpp

@@ -5,24 +5,30 @@
 #include "Renderer.h"
 
 #include "glad/glad.h"
+#include "model/TexturedModel.h"
 
 void Renderer::prepare() {
     glClearColor(1.0f, 0.0f, 0.0f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT);
 }
 
-void Renderer::renderFrame(const RawModel& model) {
+void Renderer::renderFrame(const TexturedModel& model) {
     prepare();
     staticShader.start();
     renderRawModel(model);
     staticShader.stop();
 }
 
-void Renderer::renderRawModel(const RawModel& model) {
-    glBindVertexArray(model.vaoID);
+void Renderer::renderRawModel(const TexturedModel& texturedModel) {
+    auto model = texturedModel.getRawModel();
+    glBindVertexArray(model->vaoID);
     glEnableVertexAttribArray(0);
-    glDrawElements(GL_TRIANGLES , model.vertexCount, GL_UNSIGNED_INT, 0);
+    glEnableVertexAttribArray(1);
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, texturedModel.getTexture()->getTextureID());
+    glDrawElements(GL_TRIANGLES , model->vertexCount, GL_UNSIGNED_INT, 0);
     glDisableVertexAttribArray(0);
+    glDisableVertexAttribArray(1);
     glBindVertexArray(0);
 
 }

src/engine/renderer/Renderer.h

@@ -5,15 +5,16 @@
 #ifndef DICEWARS_SIEDLER_RENDERER_H
 #define DICEWARS_SIEDLER_RENDERER_H
 #include "model/RawModel.h"
+#include "model/TexturedModel.h"
 #include "shaders/StaticShader.h"
 
 
 class Renderer {
 public:
     void prepare();
-    void renderFrame(const RawModel& moddel);
+    void renderFrame(const TexturedModel &model);
 private:
-    void renderRawModel(const RawModel &model);
+    void renderRawModel(const TexturedModel &model);
     StaticShader staticShader;
 };
 

src/engine/renderer/loader/Loader.cpp

@@ -4,9 +4,13 @@
 
 #include "Loader.h"
 
-RawModel Loader::loadToVAO(const std::vector<float>& vertices, const std::vector<int>& indices){
+#include "Texture2D.h"
+#include "TextureLoader.h"
+
+RawModel Loader::loadToVAO(const std::vector<float> &vertices, const std::vector<float> &textureCoords, const std::vector<int> &indices) {
     GLuint vaoID = createVAO();
-    storeDataInAttributeList(0, vertices);
+    storeDataInAttributeList(0, 3, vertices);
+    storeDataInAttributeList(1, 2, textureCoords);
     bindIndicesBuffer(indices);
     unbindVAO();
     return {vaoID, static_cast<int>(indices.size())};
@@ -24,6 +28,16 @@ void Loader::cleanUp() {
     for (GLuint vboID: vboIDs) {
         glDeleteBuffers(1, &vboID);
     }
+
+    for (GLuint textureID: textureIDs) {
+        glDeleteTextures(1, &textureID);
+    }
+}
+
+GLuint Loader::loadTexture(const std::string &path) {
+    Texture2D texture = TextureLoader::loadTexture(path);
+    textureIDs.push_back(texture.id);
+    return texture.id;
 }
 
 GLuint Loader::createVAO() {
@@ -34,14 +48,14 @@ GLuint Loader::createVAO() {
     return vaoID;
 }
 
-void Loader::storeDataInAttributeList(int attributeNumber, const std::vector<float> &data) {
+void Loader::storeDataInAttributeList(int attributeNumber, const int coordinateSize, const std::vector<float> &data) {
     GLuint vboID;
     glGenBuffers(1, &vboID);
     vboIDs.push_back(vboID);
 
     glBindBuffer(GL_ARRAY_BUFFER, vboID);
     glBufferData(GL_ARRAY_BUFFER, data.size() * sizeof(float), data.data(), GL_STATIC_DRAW);
-    glVertexAttribPointer(attributeNumber, 3, GL_FLOAT, GL_FALSE, 0, nullptr);
+    glVertexAttribPointer(attributeNumber, coordinateSize, GL_FLOAT, GL_FALSE, 0, nullptr);
     glBindBuffer(GL_ARRAY_BUFFER, 0);
 }
 

src/engine/renderer/loader/Loader.h

@@ -4,27 +4,30 @@
 
 #ifndef DICEWARS_SIEDLER_LOADER_H
 #define DICEWARS_SIEDLER_LOADER_H
+#include <string>
 #include <vector>
 
-#include "RawModel.h"
+#include "../model/RawModel.h"
 #include "glad/glad.h"
 
 
 class Loader
 {
 public:
-    RawModel loadToVAO(const std::vector<float>& vertices, const std::vector<int>& indices);
+    RawModel loadToVAO(const std::vector<float>& vertices, const std::vector<float>& textureCoords, const std::vector<int>& indices);
     ~Loader();
     void cleanUp();
 
+    GLuint loadTexture(const std::string &path);
 private:
     GLuint createVAO();
-    void storeDataInAttributeList(int attributeNumber, const std::vector<float> &data);
+    void storeDataInAttributeList(int attributeNumber, int coordinateSize, const std::vector<float> &data);
     void bindIndicesBuffer(const std::vector<int> &indices);
     void unbindVAO();
 
     std::vector<GLuint> vaoIDs;
     std::vector<GLuint> vboIDs;
+    std::vector<GLuint> textureIDs;
 };
 
 

src/engine/renderer/loader/Texture2D.h

@@ -0,0 +1,19 @@
+//
+// Created by sebastian on 07.02.26.
+//
+
+#ifndef TEXTURE2D_H
+#define TEXTURE2D_H
+#include "glad/glad.h"
+
+struct Texture2D {
+    GLuint id = 0;
+
+    int width = 0;
+    int height = 0;
+    int channels = 0;
+
+    unsigned char* pixels = nullptr;
+};
+
+#endif //TEXTURE2D_H

src/engine/renderer/loader/TextureLoader.cpp

@@ -0,0 +1,75 @@
+//
+// Created by sebastian on 07.02.26.
+//
+
+#include "TextureLoader.h"
+
+#include <stdexcept>
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+
+Texture2D TextureLoader::loadTexture(const std::string &path) {
+    Texture2D texture;
+
+    stbi_set_flip_vertically_on_load(true);
+
+    texture.pixels = stbi_load(
+        path.c_str(),
+        &texture.width,
+        &texture.height,
+        &texture.channels,
+        0
+    );
+
+    if (!texture.pixels) {
+        throw std::runtime_error("Failed to load texture: " + path);
+    }
+
+    GLenum format = GL_RGB;
+    if (texture.channels == 4)
+        format = GL_RGBA;
+    else if (texture.channels == 3)
+        format = GL_RGB;
+    else if (texture.channels == 1)
+        format = GL_RED;
+
+    glGenTextures(1, &texture.id);
+    glBindTexture(GL_TEXTURE_2D, texture.id);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    glTexImage2D(
+        GL_TEXTURE_2D,
+        0,
+        format,
+        texture.width,
+        texture.height,
+        0,
+        format,
+        GL_UNSIGNED_BYTE,
+        texture.pixels
+    );
+
+    glGenerateMipmap(GL_TEXTURE_2D);
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    return texture;
+}
+
+void TextureLoader::free(Texture2D &texture) {
+    if (texture.id != 0) {
+        glDeleteTextures(1, &texture.id);
+        texture.id = 0;
+    }
+
+    if (texture.pixels) {
+        stbi_image_free(texture.pixels);
+        texture.pixels = nullptr;
+    }
+}

src/engine/renderer/loader/TextureLoader.h

@@ -0,0 +1,21 @@
+//
+// Created by sebastian on 07.02.26.
+//
+
+#ifndef TEXTURELOADER_H
+#define TEXTURELOADER_H
+
+
+#include <string>
+
+#include "Texture2D.h"
+
+class TextureLoader {
+public:
+    static Texture2D loadTexture(const std::string& path);
+    static void free(Texture2D& texture);
+};
+
+
+
+#endif //TEXTURELOADER_H

src/engine/renderer/model/TexturedModel.cpp

@@ -0,0 +1,5 @@
+//
+// Created by sebastian on 07.02.26.
+//
+
+#include "TexturedModel.h"

src/engine/renderer/model/TexturedModel.h

@@ -0,0 +1,28 @@
+//
+// Created by sebastian on 07.02.26.
+//
+
+#ifndef TEXTUREDMODEL_H
+#define TEXTUREDMODEL_H
+#include <memory>
+#include <utility>
+
+#include "RawModel.h"
+#include "../textures/ModelTexture.h"
+
+
+class TexturedModel {
+private:
+    std::shared_ptr<RawModel> rawModel;
+    std::shared_ptr<ModelTexture> texture;
+
+public:
+    TexturedModel(std::shared_ptr<RawModel> rawModel, std::shared_ptr<ModelTexture> texture) : rawModel(std::move(rawModel)), texture(std::move(texture)) {};
+
+    [[nodiscard]] const std::shared_ptr<RawModel> getRawModel() const {return rawModel;}
+    [[nodiscard]] const std::shared_ptr<ModelTexture> getTexture() const {return texture;}
+};
+
+
+
+#endif //TEXTUREDMODEL_H

src/engine/renderer/shaders/StaticShader.cpp

@@ -10,4 +10,5 @@ StaticShader::StaticShader() : ShaderProgram(VERTEX_FILE, FRAGMENT_FILE) {
 
 void StaticShader::bindAttributes() const {
     bindAttribute(0, "position");
+    bindAttribute(1, "textureCoords");
 }

src/engine/renderer/textures/ModelTexture.cpp

@@ -0,0 +1,5 @@
+//
+// Created by sebastian on 07.02.26.
+//
+
+#include "ModelTexture.h"

src/engine/renderer/textures/ModelTexture.h

@@ -0,0 +1,22 @@
+//
+// Created by sebastian on 07.02.26.
+//
+
+#ifndef MODELTEXTURE_H
+#define MODELTEXTURE_H
+#include "glad/glad.h"
+
+
+class ModelTexture {
+private:
+    GLuint textureID;
+
+public:
+    explicit ModelTexture(GLuint textureID) : textureID(textureID) {};
+    [[nodiscard]] GLuint getTextureID() const {return textureID;}
+
+};
+
+
+
+#endif //MODELTEXTURE_H