refactor: split into static libraries and restructure scenes

- Create cbt_opengl static library for OpenGL abstraction - Create cbt_scene static library for base scene class - Create scenes_cube static library for cube scene - Move scene base to cbt/ (utility), scenes to root scenes/ - Link libraries in dependency chain: cuber -> scenes -> cbt_scene -> cbt_opengl
2026-05-05 22:27:19 +02:00
parent 30ddaf7d39
commit e71c4d55cf
6 changed files with 252 additions and 129 deletions
@@ -0,0 +1,149 @@
+#include "scenes/cube.hpp"
+
+#include <array>
+
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+#include "glad/glad.h"
+
+namespace cbt::scenes {
+
+cube::cube() {
+    m_start = std::chrono::steady_clock::now();
+}
+
+auto cube::init() -> bool {
+    if (!build_shader()) {
+        return false;
+    }
+    build_mesh();
+    glEnable(GL_DEPTH_TEST);
+    return true;
+}
+
+auto cube::update(float) -> void {}
+
+auto cube::render() -> void {
+    auto now = std::chrono::steady_clock::now();
+    auto elapsed = std::chrono::duration<float>(now - m_start).count();
+
+    glClearColor(0.15f, 0.15f, 0.2f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+    auto aspect = 1280.0f / 720.0f;
+    auto proj = glm::perspective(glm::radians(45.0f), aspect, 0.1f, 100.0f);
+    auto view = glm::translate(glm::mat4{1.0f}, glm::vec3{0.0f, 0.0f, -3.0f});
+    auto model = glm::rotate(glm::mat4{1.0f}, elapsed, glm::vec3{1.0f, 0.5f, 0.3f});
+
+    m_prog.use();
+    glUniformMatrix4fv(m_loc_proj, 1, GL_FALSE, glm::value_ptr(proj));
+    glUniformMatrix4fv(m_loc_view, 1, GL_FALSE, glm::value_ptr(view));
+    glUniformMatrix4fv(m_loc_model, 1, GL_FALSE, glm::value_ptr(model));
+
+    m_vao.bind();
+    glDrawArrays(GL_TRIANGLES, 0, 36);
+    m_vao.unbind();
+    m_prog.unuse();
+}
+
+auto cube::build_mesh() -> void {
+    std::array<float, 36 * 6> vertices = {
+        // front face (cyan)
+         0.5f, -0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+        -0.5f, -0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+        -0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+         0.5f, -0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+        -0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+         0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 1.0f,
+
+        // back face (magenta)
+         0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+        -0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+        -0.5f,  0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+         0.5f, -0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+        -0.5f,  0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+         0.5f,  0.5f, -0.5f,  1.0f, 0.0f, 1.0f,
+
+        // top face (yellow)
+         0.5f,  0.5f,  0.5f,  1.0f, 1.0f, 0.0f,
+        -0.5f,  0.5f,  0.5f,  1.0f, 1.0f, 0.0f,
+        -0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f,
+         0.5f,  0.5f,  0.5f,  1.0f, 1.0f, 0.0f,
+        -0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f,
+         0.5f,  0.5f, -0.5f,  1.0f, 1.0f, 0.0f,
+
+        // bottom face (white)
+         0.5f, -0.5f, -0.5f,  1.0f, 1.0f, 1.0f,
+        -0.5f, -0.5f, -0.5f,  1.0f, 1.0f, 1.0f,
+        -0.5f, -0.5f,  0.5f,  1.0f, 1.0f, 1.0f,
+         0.5f, -0.5f, -0.5f,  1.0f, 1.0f, 1.0f,
+        -0.5f, -0.5f,  0.5f,  1.0f, 1.0f, 1.0f,
+         0.5f, -0.5f,  0.5f,  1.0f, 1.0f, 1.0f,
+
+        // right face (lime)
+         0.5f, -0.5f, -0.5f,  0.0f, 1.0f, 0.0f,
+         0.5f, -0.5f,  0.5f,  0.0f, 1.0f, 0.0f,
+         0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 0.0f,
+         0.5f, -0.5f, -0.5f,  0.0f, 1.0f, 0.0f,
+         0.5f,  0.5f,  0.5f,  0.0f, 1.0f, 0.0f,
+         0.5f,  0.5f, -0.5f,  0.0f, 1.0f, 0.0f,
+
+        // left face (orange)
+        -0.5f, -0.5f, -0.5f,  1.0f, 0.5f, 0.0f,
+        -0.5f, -0.5f,  0.5f,  1.0f, 0.5f, 0.0f,
+        -0.5f,  0.5f,  0.5f,  1.0f, 0.5f, 0.0f,
+        -0.5f, -0.5f, -0.5f,  1.0f, 0.5f, 0.0f,
+        -0.5f,  0.5f,  0.5f,  1.0f, 0.5f, 0.0f,
+        -0.5f,  0.5f, -0.5f,  1.0f, 0.5f, 0.0f,
+    };
+
+    m_vbo.upload(vertices.data(), vertices.size() * sizeof(float));
+
+    m_vao.bind();
+    m_vbo.bind();
+    glEnableVertexAttribArray(0);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), nullptr);
+    glEnableVertexAttribArray(1);
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float),
+                         reinterpret_cast<void*>(3 * sizeof(float)));
+    m_vbo.unbind();
+    m_vao.unbind();
+}
+
+auto cube::build_shader() -> bool {
+    char const* vert_src = R"glsl(
+        #version 410 core
+        layout(location = 0) in vec3 a_pos;
+        layout(location = 1) in vec3 a_color;
+        uniform mat4 u_model;
+        uniform mat4 u_view;
+        uniform mat4 u_proj;
+        out vec3 v_color;
+        void main() {
+            gl_Position = u_proj * u_view * u_model * vec4(a_pos, 1.0);
+            v_color = a_color;
+        }
+    )glsl";
+
+    char const* frag_src = R"glsl(
+        #version 410 core
+        in vec3 v_color;
+        out vec4 frag_color;
+        void main() {
+            frag_color = vec4(v_color, 1.0);
+        }
+    )glsl";
+
+    if (!m_prog.compile_vertex(vert_src) || !m_prog.compile_fragment(frag_src) || !m_prog.link()) {
+        return false;
+    }
+
+    m_loc_proj = glGetUniformLocation(m_prog.id(), "u_proj");
+    m_loc_view = glGetUniformLocation(m_prog.id(), "u_view");
+    m_loc_model = glGetUniformLocation(m_prog.id(), "u_model");
+
+    return true;
+}
+
+}