basic textures

.gitignore

@@ -6,7 +6,6 @@
 *.slo
 *.lo
 *.o
-*.obj
 
 # Precompiled Headers
 *.gch

assets/models/Sci-fi_Container_Game.mtl

@@ -0,0 +1,13 @@
+# Blender 5.0.0 MTL File: 'Sci-fi Container Game.blend'
+# www.blender.org
+
+newmtl Материал
+Ns 250.000000
+Ka 1.000000 1.000000 1.000000
+Kd 0.800000 0.800000 0.800000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Bump -bm 1.000000 Sci-fi_Container_Normal_OpenGL.png

assets/models/cube.obj

@@ -0,0 +1,36 @@
+# Blender 4.5.4 LTS
+# www.blender.org
+mtllib cube.mtl
+o Cube
+v -1.000000 -1.000000 1.000000 1.0000 1.0000 1.0000
+v -1.000000 1.000000 1.000000 1.0000 1.0000 1.0000
+v -1.000000 -1.000000 -1.000000 1.0000 1.0000 1.0000
+v -1.000000 1.000000 -1.000000 1.0000 1.0000 1.0000
+v 1.000000 -1.000000 1.000000 1.0000 1.0000 1.0000
+v 1.000000 1.000000 1.000000 1.0000 1.0000 1.0000
+v 1.000000 -1.000000 -1.000000 1.0000 1.0000 1.0000
+v 1.000000 1.000000 -1.000000 1.0000 1.0000 1.0000
+vn -1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 -1.0000
+vn 1.0000 -0.0000 -0.0000
+vn -0.0000 -0.0000 1.0000
+vn -0.0000 -1.0000 -0.0000
+vn -0.0000 1.0000 -0.0000
+vt 0.000000 1.000000
+vt 1.000000 0.000000
+vt 0.000000 0.000000
+vt 1.000000 1.000000
+s 0
+usemtl Material.002
+f 2/1/1 3/2/1 1/3/1
+f 4/1/2 7/2/2 3/3/2
+f 8/4/3 5/3/3 7/2/3
+f 6/4/4 1/3/4 5/2/4
+f 7/4/5 1/3/5 3/1/5
+f 4/1/6 6/2/6 8/4/6
+f 2/1/1 4/4/1 3/2/1
+f 4/1/2 8/4/2 7/2/2
+f 8/4/3 6/1/3 5/3/3
+f 6/4/4 2/1/4 1/3/4
+f 7/4/5 5/2/5 1/3/5
+f 4/1/6 2/3/6 6/2/6

inc/engine/opengl.hpp

@@ -7,6 +7,7 @@
 #include "engine/buffers.hpp"
 #include "engine/shaders.hpp"
 #include "engine/camera.hpp"
+#include "engine/textures.hpp"
 
 // OpenGL Context Class
 class OpenGLContext {

inc/engine/textures.hpp

@@ -0,0 +1,19 @@
+#ifndef TEXTURES_HPP
+#define TEXTURES_HPP
+
+// Includes
+#include <SDL3/SDL_opengl.h>
+
+// Texture Class
+class Texture {
+public:
+    Texture(const char* filePath);
+    ~Texture();
+
+    void bind(GLenum textureUnit) const;
+
+private:
+    GLuint textureID;
+};
+
+#endif

shaders/triangle.frag

@@ -1,8 +1,11 @@
 #version 330 core
 
 out vec4 FragColor;
-in vec3 color; // Input color from the vertex shader
+in vec3 Color; // Input color from the vertex shader
+in vec2 TexCoord; // Input texture coordinate from the vertex shader
+
+uniform sampler2D Texture1;
 
 void main() {
-    FragColor = vec4(color, 1.0); // Apply the color directly
+    FragColor = texture(Texture1, TexCoord);
 }

shaders/triangle.vert

@@ -3,7 +3,8 @@
 layout(location = 0) in vec3 position; // Vertex position
 layout(location = 1) in vec3 normal;   // Vertex normal
 layout(location = 2) in vec2 texCoord; // Vertex texture coordinate
-out vec3 color; // Output color to the fragment shader
+out vec3 Color; // Output color to the fragment shader
+out vec2 TexCoord; // Output texture coordinate to the fragment shader
 
 uniform mat4 model;
 uniform mat4 view;
@@ -11,5 +12,6 @@ uniform mat4 projection;
 
 void main() {
     gl_Position = projection * view * model * vec4(position, 1.0); // Apply transformation matrices
-    color = vec3(1.0, 0.5, 0.2); // Set output color (orange)
+    Color = normal * 0.5 + 0.5; // Simple coloring based on normal
+    TexCoord = texCoord; // Pass through the texture coordinate
 }

src/engine/textures.cpp

@@ -0,0 +1,42 @@
+#define GL_GLEXT_PROTOTYPES
+#include "engine/textures.hpp"
+#include <SDL3_image/SDL_image.h>
+
+// Texture Class Constructor
+Texture::Texture(const char* filePath) {
+    glGenTextures(1, &textureID);
+    glBindTexture(GL_TEXTURE_2D, textureID);
+
+    // Load texture image
+    SDL_Surface* image = IMG_Load(filePath);
+    if (!image) {
+        SDL_Log("Failed to load texture image.");
+        return;
+    }
+
+    // Flip the image vertically
+    SDL_FlipSurface(image, SDL_FLIP_VERTICAL);
+
+    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);
+
+    // Determine the format
+    GLenum format = (image->format == SDL_PIXELFORMAT_RGBA32) ? GL_RGBA : GL_RGB;
+    glTexImage2D(GL_TEXTURE_2D, 0, format, image->w, image->h, 0, format, GL_UNSIGNED_BYTE, image->pixels);
+    glGenerateMipmap(GL_TEXTURE_2D);
+
+    SDL_DestroySurface(image);
+}
+
+// Texture Class Destructor
+Texture::~Texture() {
+    glDeleteTextures(1, &textureID);
+}
+
+// Bind Texture Method
+void Texture::bind(GLenum textureUnit) const {
+    glActiveTexture(textureUnit);
+    glBindTexture(GL_TEXTURE_2D, textureID);
+}

src/main.cpp

@@ -7,10 +7,11 @@ int main(int argc, char* argv[]) {
     if (!window.isRunning()) { return -1; }
     OpenGLContext glContext(window);
     if (!glContext.isInitialized()) { return -1; }
+    glEnable(GL_DEPTH_TEST); 
 
     Camera camera(
-        glm::vec3(2.0f, 1.0f, 3.0f), // Position
-        glm::vec3(0.0f, 0.0f, 0.0f), // Target
+        glm::vec3(3.0f, 4.0f, 6.0f), // Position
+        glm::vec3(0.0f, 1.0f, 0.0f), // Target
         glm::vec3(0.0f, 1.0f, 0.0f)  // Up vector
     );
 
@@ -23,7 +24,7 @@ int main(int argc, char* argv[]) {
 
     Shader shader_program("shaders/triangle.vert", "shaders/triangle.frag");
 
-    OBJLoader objLoader("assets/models/suzanne.obj");
+    OBJLoader objLoader("assets/models/Sci-fi_Container_Game.obj");
     if (!objLoader.isLoaded()) {
         SDL_Log("Failed to load OBJ model.");
         return -1;
@@ -36,8 +37,8 @@ int main(int argc, char* argv[]) {
     VAO.setAttributePointer(1, 3, GL_FLOAT, false, 8 * sizeof(float), 3 * sizeof(float)); // normal
     VAO.setAttributePointer(2, 2, GL_FLOAT, false, 8 * sizeof(float), 6 * sizeof(float)); // texCoord
 
-    // Wireframe mode
-    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+    Texture texture("assets/textures/Sci-fi_Container_Base_Color.png");
+    texture.bind(GL_TEXTURE0);
 
     window.setPosition(SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
     window.showWindow();