104 lines
3.8 KiB
C
104 lines
3.8 KiB
C
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#pragma once
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#include "../../gfx/model.h"
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#include "../../gfx/texture.h"
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#include "../../gfx/textured_model.h"
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#include "../../renderable.h"
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#include "../../vertex.h"
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#include <vector>
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namespace simpleengine::objects_3d {
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class Terrain : public simpleengine::gfx::TexturedModel {
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private:
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/**
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* @brief DO NOT USE!!! Replaced with lit_vertices
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*
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*/
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using gfx::Model::vertices;
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public:
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std::vector<LitVertex> lit_vertices;
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const float size;
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const int vertex_count;
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float x;
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float y;
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gfx::Texture texture;
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Terrain(GLFWwindow* window, gfx::Shader shader, gfx::Texture texture, int grid_x, int grid_y, float size = 800.f, int vertex_count = 128) :
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simpleengine::gfx::TexturedModel(window, shader, { texture }, std::vector<Vertex>()), x(grid_x * size), y(grid_y * size),
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texture(texture), size(size), vertex_count(vertex_count) {
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generate_terrain();
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}
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protected:
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virtual void setup_vertices() override {
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vao.bind();
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vbo.buffer(lit_vertices.data(), 0, sizeof(LitVertex) * lit_vertices.size());
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ebo.buffer(indicies.data(), 0, indicies.size() * sizeof(GLuint));
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// Enable VAO attributes
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vao.enable_attrib(vbo, 0, 3, GL_FLOAT, sizeof(LitVertex), offsetof(LitVertex, position));
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//vao.enable_attrib(vbo, 1, 3, GL_FLOAT, sizeof(LitVertex), offsetof(LitVertex, color));
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vao.enable_attrib(vbo, 1, 2, GL_FLOAT, sizeof(LitVertex), offsetof(LitVertex, tex_coord));
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vao.enable_attrib(vbo, 2, 3, GL_FLOAT, sizeof(LitVertex), offsetof(LitVertex, normal));
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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glBindVertexArray(0);
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}
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public:
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void generate_terrain() {
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lit_vertices.clear();
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indicies.clear();
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// Reserve space for vertices and indicies before hand.
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int count = pow(vertex_count, 2);
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lit_vertices.reserve(count);
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indicies.reserve(6 * pow(vertex_count - 1, 2));
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int vertex_index = 0;
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for (int i = 0; i < vertex_count; i++) {
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for (int j = 0; j < vertex_count; j++) {
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Vectorf pos( (float) j / ((float) vertex_count - 1) * size, 0, (float) i / ((float) vertex_count - 1) * size);
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glm::vec2 tex( (float) j / (float) vertex_count - 1, (float) i / (float) vertex_count - 1);
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glm::vec3 normals(0, 1, 0);
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lit_vertices.emplace_back(pos, tex, normals);
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vertex_index++;
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}
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}
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int indicies_index = 0;
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for (int i = 0; i < vertex_count; i++) {
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for (int j = 0; j < vertex_count; j++) {
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int top_left = (i * vertex_count) + j;
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int top_right = top_left + 1;
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int bottom_left = ((i + 1) * vertex_count) + j;
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int bottom_right = bottom_left + 1;
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indicies.push_back(top_left);
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indicies.push_back(bottom_left);
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indicies.push_back(top_right);
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indicies.push_back(top_right);
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indicies.push_back(bottom_left);
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indicies.push_back(bottom_right);
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}
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}
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std::cout << "========= New terrain generated =========" << std::endl;
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std::cout << " Lit vertices count: " << lit_vertices.size() << std::endl;
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std::cout << " Indicies count: " << indicies.size() << std::endl;
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setup_vertices();
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}
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virtual void update(const float& delta_time) override {
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}
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/* virtual void render(GLFWwindow* target) override {
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} */
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};
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}
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