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-rw-r--r--src/client/draw.cc432
1 files changed, 432 insertions, 0 deletions
diff --git a/src/client/draw.cc b/src/client/draw.cc
new file mode 100644
index 0000000..c549ffe
--- /dev/null
+++ b/src/client/draw.cc
@@ -0,0 +1,432 @@
+#include "draw.hh"
+
+namespace client {
+namespace draw {
+
+void draw_rectangle(const rectangle_args& ra) noexcept {
+ const glm::vec2 pos = ra.pos.to_vec2();
+ const glm::vec2 size = ra.size.to_vec2();
+
+ // We want to render from the bottom left corner.
+ render::render_rectangle(pos + (size / 2.0f), size, ra.colour);
+}
+
+void draw_colour(const glm::vec4& colour) noexcept {
+ const rectangle_args args = {
+ .pos = {.extent = {0.0f, 0.0f}},
+ .size = {.extent = {1.0f, 1.0f}},
+ .colour = colour,
+ };
+ draw_rectangle(args);
+}
+
+void draw_text(const std::string_view text, const text_args& args) noexcept {
+ const glm::vec2& window = render::get_window_size();
+ const float x = floorf(window.x * args.pos.extent.x + args.pos.offset.x);
+ const float y = floorf(window.y * args.pos.extent.y + args.pos.offset.y);
+ const unsigned height = static_cast<unsigned>(
+ args.extent_height * window.y + args.offset_height);
+
+ const auto make_matrix = [&](const float xo, const float yo) -> glm::mat4 {
+ constexpr auto identity = glm::mat4(1.0f);
+ const auto proj = glm::ortho(0.f, window.x, 0.f, window.y);
+ const auto tran =
+ glm::translate(identity, glm::vec3{x + xo, y + yo, 0.0f});
+ return proj * tran;
+ };
+
+ glDisable(GL_DEPTH_TEST);
+ glDisable(GL_BLEND);
+ if (args.has_backing) {
+ constexpr glm::vec4 black{0.0f, 0.0f, 0.0f, 1.0f};
+ render::render_text(text, height, args.is_centered, args.is_vcentered,
+ black, make_matrix(1.0f, -2.0f));
+ }
+ glEnable(GL_BLEND);
+
+ render::render_text(text, height, args.is_centered, args.is_vcentered,
+ args.colour, make_matrix(0, 0));
+ glEnable(GL_DEPTH_TEST);
+}
+
+static void draw_state_info(const shared::player& lp) noexcept {
+
+ constexpr auto nstr = [](const auto d) -> std::string {
+ auto str = std::to_string(d);
+ str.erase(std::prev(std::end(str), 4), std::end(str));
+ return str;
+ };
+
+ const auto make_position = [&]() -> std::string {
+ const auto chunk_x = lp.chunk_pos.x;
+ const auto chunk_z = lp.chunk_pos.z;
+ const auto x = static_cast<double>(lp.local_pos.x);
+ const auto y = static_cast<double>(lp.local_pos.y);
+ const auto z = static_cast<double>(lp.local_pos.z);
+ constexpr auto WIDTH = shared::world::chunk::WIDTH;
+ const auto abs_x = static_cast<double>(lp.chunk_pos.x) * WIDTH + x;
+ const auto abs_z = static_cast<double>(lp.chunk_pos.z) * WIDTH + z;
+
+ constexpr auto nstr = [](const double d) -> std::string {
+ auto str = std::to_string(d);
+ str.erase(std::prev(std::end(str), 4), std::end(str));
+ return str;
+ };
+ const std::string chk_str = '[' + std::to_string(chunk_x) + ", " +
+ std::to_string(chunk_z) + ']';
+ const std::string abs_str =
+ '(' + nstr(abs_x) + ", " + nstr(y) + ", " + nstr(abs_z) + ')';
+ return "position: " + abs_str + chk_str;
+ };
+
+ const auto make_direction = [&]() -> std::string {
+ const float yaw = glm::degrees(lp.viewangles.yaw);
+ const float pitch = glm::degrees(lp.viewangles.pitch);
+
+ const std::string bearing = [&]() -> std::string {
+ if (yaw >= 315.0f || yaw < 45.0f) {
+ return "North";
+ } else if (yaw >= 45.0f && yaw < 135.0f) {
+ return "East";
+ } else if (yaw >= 135.0f && yaw < 225.0f) {
+ return "South";
+ } else {
+ return "West";
+ }
+ }();
+ const std::string face_str = '(' + nstr(pitch) + ", " + nstr(yaw) + ')';
+ // Yaw is between 0 and 360.
+ return "perspective: " + face_str + " -> " + bearing;
+ };
+
+ const auto make_address = []() -> std::string {
+ const std::string address = std::string(client::state.address);
+ const std::string port = std::string(client::state.port);
+ return "address: " + address + ":" + port;
+ };
+
+ const auto make_seed = []() -> std::string {
+ return "seed: " + std::to_string(client::state.seed);
+ };
+
+ const auto make_players = []() -> std::string {
+ const auto index = std::to_string(client::state.localplayer);
+ return "index: " + index;
+ };
+
+ const auto make_chunks = []() -> std::string {
+ return "chunks [req, rcv]: " +
+ std::to_string(client::state.requested_chunk_count) + ", " +
+ std::to_string(client::state.networked_chunk_count) + " @ " +
+ std::to_string(client::state.draw_distance) + " draw distance";
+ };
+
+ const auto make_speed = [&]() -> std::string {
+ return "speed: " + nstr(glm::length(lp.velocity)) + " b/s";
+ };
+
+ const auto make_velocity = [&]() -> std::string {
+ return "velocity: (" + nstr(lp.velocity.x) + ", " +
+ nstr(lp.velocity.y) + ", " + nstr(lp.velocity.z) + ")";
+ };
+
+ // Draws all of our strings and works its way down the top of the screen.
+ text_args args{.pos = {.extent = {0.0f, 1.0f - 0.015f}},
+ .extent_height = 0.0165f,
+ .colour = {1.0f, 1.0f, 1.0f, 1.0f},
+ .has_backing = true};
+ const auto draw_str_trail = [&args](const std::string& str) {
+ draw_text(str, args);
+ args.pos.extent.y -= 0.02f;
+ };
+ draw_str_trail("blockgame_linux v0.20");
+ draw_str_trail(make_address());
+ draw_str_trail(make_seed());
+ draw_str_trail(make_players());
+ draw_str_trail(make_chunks());
+ draw_str_trail(make_position());
+ draw_str_trail(make_direction());
+ draw_str_trail(make_speed());
+ draw_str_trail(make_velocity());
+}
+
+static void draw_fps() noexcept {
+ const auto get_fps_colour = [](const int fps) -> glm::vec4 {
+ if (fps == 0) {
+ return {1.0f, 1.0f, 1.0f, 1.0f};
+ } else if (fps < 30) {
+ return {1.0f, 0.0f, 0.0f, 1.0f};
+ } else if (fps < 60) {
+ return {1.0f, 0.5f, 0.0f, 1.0f};
+ } else if (fps < 120) {
+ return {0.0f, 1.0f, 0.0f, 1.0f};
+ }
+ return {0.0f, 1.0f, 1.0f, 1.0f};
+ };
+
+ const int fps = client::render::get_fps();
+ const std::string fps_str = fps != 0 ? std::to_string(fps) : "~";
+ draw_text("FPS: " + fps_str, {.pos = relative_arg{.offset = {0.0f, 2.0f}},
+ .extent_height = 0.0165f,
+ .colour = get_fps_colour(fps),
+ .has_backing = true});
+}
+
+// Player position, version, fps etc
+// Just don't read past this point, doing this is unbelievably ugly.
+// I don't know why I write this like someone else will read it.
+static void draw_overlay(const shared::player& lp) noexcept {
+ draw_state_info(lp);
+ draw_fps();
+}
+
+static void draw_main_pass(const shared::player& localplayer,
+ client::players& players,
+ client::world::chunk::map& chunks) noexcept {
+ for (auto& chunk : chunks) {
+ if (!chunk.second.has_value()) {
+ continue;
+ }
+ chunk.second->draw(chunks, localplayer,
+ client::world::chunk::pass::solid);
+ }
+
+ // Draw players while ignoring the localplayer, which is always 0'th!
+ // This also handles drawing messages.
+ for (auto i = 1u; i < std::size(players); ++i) {
+ players[i].draw_playermodel(localplayer);
+ }
+}
+
+static void draw_water_pass(const shared::player& localplayer,
+ client::world::chunk::map& chunks) noexcept {
+ for (auto& chunk : chunks) {
+ if (!chunk.second.has_value()) {
+ continue;
+ }
+ chunk.second->draw(chunks, localplayer,
+ client::world::chunk::pass::water);
+ }
+}
+
+static void draw_wts_text(const shared::player& localplayer,
+ client::players& players) noexcept {
+ for (auto i = 1u; i < std::size(players); ++i) {
+ players[i].draw_message(localplayer);
+ }
+}
+
+static void draw_hud(const client::player& localplayer,
+ const client::world::chunk::map& chunks) noexcept {
+ if (client::input::is_key_toggled(SDLK_F3)) {
+ draw_overlay(localplayer);
+ }
+
+ if (const auto& msg = localplayer.get_message(); msg.has_value()) {
+ if (msg->receive_time + player::MSG_SHOW_TIME >=
+ std::chrono::steady_clock::now()) {
+ draw_text(msg->text, {.pos = relative_arg{.extent = {0.5f, 0.0f},
+ .offset = {0.0f, 2.0f}},
+ .extent_height = 0.0165f,
+ .colour = {1.0f, 1.0f, 1.0f, 1.0f},
+ .has_backing = true,
+ .is_centered = true});
+ }
+ }
+
+ if (client::window::is_open()) {
+ return;
+ }
+
+ // crosshair
+ client::draw::draw_rectangle(
+ {.pos = {.extent = {0.5f, 0.5f}, .offset = {-3.0f, -3.0f}},
+ .size = {.offset = {6.0f, 6.0f}},
+ .colour = {1.0f, 1.0f, 1.0f, 1.0f}});
+
+ // Draw the outline of the block we're aiming at.
+ if (const auto interact = client::movement::interact(
+ localplayer, movement::interact_mode::remove, chunks);
+ interact.has_value()) {
+
+ const auto [world_x, world_z] = [&]() -> std::pair<float, float> {
+ const float offset_x =
+ static_cast<float>(interact->first.x - localplayer.chunk_pos.x);
+ const float offset_z =
+ static_cast<float>(interact->first.z - localplayer.chunk_pos.z);
+ return {offset_x * shared::world::chunk::WIDTH,
+ offset_z * shared::world::chunk::WIDTH};
+ }();
+
+ const glm::vec3 render_pos = {
+ world_x + static_cast<float>(interact->second.x),
+ interact->second.y,
+ world_z + static_cast<float>(interact->second.z)};
+
+ client::render::render_cube_outline(render_pos + 0.5f,
+ {0.8f, 0.8f, 0.8f, 1.0f});
+ }
+}
+
+static void update_camera(const shared::player& localplayer) noexcept {
+ // approximately encompasses everything we could possibly see
+
+ // if our zfar is too low, our fog breaks
+ // bit of maths for calculating the max distance we could can see
+ client::render::camera::get_zfar() = std::hypot(
+ static_cast<float>(world::chunk::HEIGHT),
+ float(client::state.draw_distance) * std::hypot(16.0f, 16.0f));
+ client::render::camera::get_pos() =
+ localplayer.local_pos +
+ glm::vec3{0.0f, shared::player::EYE_HEIGHT, 0.0f};
+ client::render::camera::get_front() =
+ shared::math::angle_to_dir(localplayer.viewangles);
+ client::render::camera::update();
+}
+
+// We create framebuffer here to enable postprocessing and solve some
+// rendering problems.
+static void draw_buffers(const shared::player& localplayer,
+ client::players& players,
+ client::world::chunk::map& chunks) noexcept {
+ const auto make_vbo = [](const auto& vertices) -> GLuint {
+ GLuint vbo = 0;
+ glGenBuffers(1, &vbo);
+ glBindBuffer(GL_ARRAY_BUFFER, vbo);
+ glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), std::data(vertices),
+ GL_STATIC_DRAW);
+ return vbo;
+ };
+ const auto make_vao = []() -> GLuint {
+ GLuint vao = 0;
+ glGenVertexArrays(1, &vao);
+ glBindVertexArray(vao);
+ // position
+ glVertexAttribPointer(0, sizeof(glm::vec2) / sizeof(float), GL_FLOAT,
+ GL_FALSE, sizeof(glm::vec2), nullptr);
+ glEnableVertexAttribArray(0);
+ return vao;
+ };
+ const auto make_ebo = [](const auto& indices) -> GLuint {
+ GLuint ebo = 0;
+ glGenBuffers(1, &ebo);
+ glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+ glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), &indices,
+ GL_STATIC_DRAW);
+ return ebo;
+ };
+ const auto make_fbo = []() -> GLuint {
+ GLuint fbo;
+ glGenFramebuffers(1, &fbo);
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+ return fbo;
+ };
+ const auto make_texture = [](const auto& internal_format,
+ const auto& format,
+ const int texture_offset) -> GLuint {
+ GLuint texture;
+ glGenTextures(1, &texture);
+ glActiveTexture(GL_TEXTURE2 + texture_offset);
+ glBindTexture(GL_TEXTURE_2D, texture);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
+
+ const glm::vec2& window = client::render::get_window_size();
+ glTexImage2D(GL_TEXTURE_2D, 0, internal_format, window.x, window.y, 0,
+ internal_format, GL_UNSIGNED_BYTE, nullptr);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, format, GL_TEXTURE_2D, texture,
+ 0);
+ return texture;
+ };
+
+ static constexpr std::array<glm::vec2, 4> vertices = {
+ glm::vec2{-1.0f, -1.0f}, glm::vec2{1.0f, -1.0f}, glm::vec2{1.0f, 1.0f},
+ glm::vec2{-1.0f, 1.0f}};
+ static constexpr std::array<unsigned, 6> indices = {0, 1, 2, 2, 3, 0};
+ static const client::render::program framebuffer_program{
+ "res/shaders/framebuffer.vs", "res/shaders/framebuffer.fs"};
+ static const GLuint vbo [[maybe_unused]] = make_vbo(vertices);
+ static const GLuint vao = make_vao();
+ static const GLuint ebo [[maybe_unused]] = make_ebo(indices);
+ // Main frame buffer object.
+ static const GLuint fbo_main = make_fbo();
+ static const GLuint main_colour [[maybe_unused]] =
+ make_texture(GL_RGB, GL_COLOR_ATTACHMENT0, 0);
+ static const GLuint main_depth [[maybe_unused]] =
+ make_texture(GL_DEPTH_COMPONENT, GL_DEPTH_ATTACHMENT, 1);
+ // Water frame buffer object.
+ static const GLuint fbo_water = make_fbo();
+ static const GLuint water_colour [[maybe_unused]] =
+ make_texture(GL_RGB, GL_COLOR_ATTACHMENT0, 2);
+ static const GLuint water_depth [[maybe_unused]] =
+ make_texture(GL_DEPTH_COMPONENT, GL_DEPTH_ATTACHMENT, 3);
+ static const GLint u_is_underwater =
+ glGetUniformLocation(framebuffer_program, "_u_is_underwater");
+
+ // We render our main scene on the main framebuffer.
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo_main);
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ draw_main_pass(localplayer, players, chunks);
+
+ // We render our water scene on the water framebuffer.
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo_water);
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ const bool is_underwater = [&]() -> bool {
+ const glm::ivec3 pos{client::render::camera::get_pos()};
+
+ const auto find_it = chunks.find(localplayer.chunk_pos);
+ if (find_it == std::end(chunks) || !find_it->second.has_value()) {
+ return false;
+ }
+ if (shared::world::chunk::is_outside_chunk(pos)) {
+ return false;
+ }
+
+ const auto block = find_it->second->get_block(pos);
+ return block.type == shared::world::block::type::water;
+ }();
+ if (is_underwater) {
+ glFrontFace(GL_CW);
+ draw_water_pass(localplayer, chunks);
+ glFrontFace(GL_CCW);
+ } else {
+ draw_water_pass(localplayer, chunks);
+ }
+
+ glBindFramebuffer(GL_FRAMEBUFFER, main_colour);
+ glDisable(GL_DEPTH_TEST);
+ glUseProgram(framebuffer_program);
+ glBindVertexArray(vao);
+
+ glUniform1i(u_is_underwater, is_underwater);
+
+ glDrawElements(GL_TRIANGLES, std::size(indices), GL_UNSIGNED_INT, nullptr);
+
+ static client::render::program postprocess_program{
+ "res/shaders/framebuffer.vs", "res/shaders/postprocess.fs"};
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+ glUseProgram(postprocess_program);
+ glDrawElements(GL_TRIANGLES, std::size(indices), GL_UNSIGNED_INT, nullptr);
+
+ glEnable(GL_DEPTH_TEST);
+}
+
+void draw(client::players& players,
+ client::world::chunk::map& chunks) noexcept {
+ const auto& localplayer = client::get_localplayer(players);
+
+ update_camera(localplayer);
+ client::render::update_uniforms();
+
+ draw_buffers(localplayer, players, chunks);
+ draw_hud(localplayer, chunks);
+ draw_wts_text(localplayer, players);
+
+ client::window::draw();
+
+ client::render::swap_window();
+}
+
+} // namespace draw
+} // namespace client
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