From be691582ee12613278af24cb5a824eeb357f6324 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Mon, 29 Jul 2024 11:27:22 -0400
Subject: some work on compositor

---
 applications/goldman/makefile            |   2 +-
 applications/goldman/source/input.cpp    |  21 ++++
 applications/goldman/source/input.hpp    |   3 +
 applications/goldman/source/main.cpp     |  84 ++++------------
 applications/goldman/source/main.hpp     |   5 +
 applications/goldman/source/renderer.cpp | 102 +++++++++++++++++++
 applications/goldman/source/renderer.hpp |  61 ++++++++++++
 applications/goldman/source/socket.cpp   | 162 +++++++++++++++++++++++++++++++
 applications/goldman/source/socket.hpp   |   5 +
 applications/goldman/source/window.hpp   |  14 +++
 10 files changed, 395 insertions(+), 64 deletions(-)
 create mode 100644 applications/goldman/source/input.cpp
 create mode 100644 applications/goldman/source/input.hpp
 create mode 100644 applications/goldman/source/main.hpp
 create mode 100644 applications/goldman/source/renderer.cpp
 create mode 100644 applications/goldman/source/renderer.hpp
 create mode 100644 applications/goldman/source/socket.cpp
 create mode 100644 applications/goldman/source/socket.hpp
 create mode 100644 applications/goldman/source/window.hpp

(limited to 'applications/goldman')

diff --git a/applications/goldman/makefile b/applications/goldman/makefile
index 56f633d..c6de0e7 100644
--- a/applications/goldman/makefile
+++ b/applications/goldman/makefile
@@ -1,5 +1,5 @@
 SOURCES = \
-  main.cpp
+  main.cpp renderer.cpp input.cpp socket.cpp
 
 build/%.cpp.o: source/%.cpp
 	@mkdir -p $(@D)
diff --git a/applications/goldman/source/input.cpp b/applications/goldman/source/input.cpp
new file mode 100644
index 0000000..0cd6922
--- /dev/null
+++ b/applications/goldman/source/input.cpp
@@ -0,0 +1,21 @@
+#include "input.hpp"
+#include "main.hpp"
+
+[[noreturn]] void input_thread_main() {
+
+  euler::syscall::set_thread_name("input thread");
+
+  while (true) {
+
+    auto result = euler::syscall::get_input_packet();
+    if (std::holds_alternative<euler::syscall::mouse_packet>(result)) {
+      auto packet = std::get<euler::syscall::mouse_packet>(result);
+      r->lock();
+      r->bump_cursor(packet.x_changed, packet.y_changed);
+      r->unlock();
+      r->dispatch_render();
+    }
+
+  }
+
+}
diff --git a/applications/goldman/source/input.hpp b/applications/goldman/source/input.hpp
new file mode 100644
index 0000000..108cdad
--- /dev/null
+++ b/applications/goldman/source/input.hpp
@@ -0,0 +1,3 @@
+#pragma once
+
+[[noreturn]] void input_thread_main();
diff --git a/applications/goldman/source/main.cpp b/applications/goldman/source/main.cpp
index d74eaad..475129f 100644
--- a/applications/goldman/source/main.cpp
+++ b/applications/goldman/source/main.cpp
@@ -1,79 +1,37 @@
 #include <daguerre/framebuffer.hpp>
 #include <daguerre/ppm.hpp>
+#include "renderer.hpp"
+#include "socket.hpp"
+#include "input.hpp"
+#include "main.hpp"
 
-daguerre::hilbert_color trans_color;
+//TODO: handle errors
 
-void convert_pointer(
-  daguerre::hilbert_color &dest, const daguerre::hilbert_color &src) {
-  if (src != trans_color)
-    dest = src;
-}
+renderer *r;
 
 int main(int, char **) {
 
-  trans_color = euler::syscall::encode_color(0xff, 0x00, 0xff);
-
-  daguerre::image<daguerre::hilbert_color> framebuffer =
-    daguerre::get_hilbert_framebuffer();
-
-  int fw = framebuffer.width;
-  int fh = framebuffer.height;
-
-  daguerre::image<daguerre::hilbert_color> double_buffer(fw, fh);
+  euler::syscall::listener_handle listener;
+  euler::syscall::create_socket_listener("hilbert.compositor", listener);
 
-  std::optional<daguerre::image<daguerre::hilbert_color>>
-    background_original = daguerre::try_load_ppm("/assets/background.ppm");
-
-  daguerre::image<daguerre::hilbert_color> background;
-
-  if (background_original.has_value())
-    background = background_original->stretch(fw, fh);
-  else {
-    background = daguerre::image<daguerre::hilbert_color>(fw, fh);
-    background.fill(euler::syscall::encode_color(0, 0, 0));
-  }
+  r = new renderer(
+    daguerre::get_hilbert_framebuffer(),
+    *daguerre::try_load_ppm("/assets/background.ppm"),
+    euler::syscall::encode_color(0x00, 0x00, 0x00),
+    *daguerre::try_load_ppm("/assets/pointer.ppm"),
+    euler::syscall::encode_color(0xff, 0x00, 0xff));
 
-  std::optional<daguerre::image<daguerre::hilbert_color>>
-    pointer_original = daguerre::try_load_ppm("/assets/pointer.ppm");
+  euler::syscall::start_thread([]() { r->render_thread_main(); });
+  euler::syscall::start_thread(input_thread_main);
 
-  if (!pointer_original.has_value())
-    //TODO
-    while (1)
-      ;
+  r->dispatch_render();
 
-  daguerre::image<daguerre::hilbert_color>
-    pointer = std::move(*pointer_original);
-
-  int mouse_x = fw / 2;
-  int mouse_y = fh / 2;
+  euler::syscall::set_thread_name("socket listener thread");
 
   while (true) {
-
-    double_buffer.copy_from(background, 0, 0);
-    double_buffer.convert_from(pointer, mouse_x, mouse_y, 0, 0,
-      std::min(pointer. width, double_buffer. width - mouse_x),
-      std::min(pointer.height, double_buffer.height - mouse_y),
-      &convert_pointer);
-
-    framebuffer.copy_from(double_buffer, 0, 0);
-
-    auto result = euler::syscall::get_input_packet();
-    if (std::holds_alternative<euler::syscall::mouse_packet>(result)) {
-      const auto &packet = std::get<euler::syscall::mouse_packet>(result);
-      mouse_x += packet.x_changed;
-      mouse_y += packet.y_changed;
-      if (mouse_x < 0)
-        mouse_x = 0;
-      else if (mouse_x >= fw)
-        mouse_x = fw - 1;
-      if (mouse_y < 0)
-        mouse_y = 0;
-      else if (mouse_y >= fh)
-        mouse_y = fh - 1;
-    }
-
+    euler::syscall::stream_handle socket;
+    euler::syscall::accept_socket_connection(listener, socket);
+    euler::syscall::start_thread(socket_thread_main, socket);
   }
 
-  return 0;
-
 }
diff --git a/applications/goldman/source/main.hpp b/applications/goldman/source/main.hpp
new file mode 100644
index 0000000..57de676
--- /dev/null
+++ b/applications/goldman/source/main.hpp
@@ -0,0 +1,5 @@
+#pragma once
+
+#include "renderer.hpp"
+
+extern renderer *r;
diff --git a/applications/goldman/source/renderer.cpp b/applications/goldman/source/renderer.cpp
new file mode 100644
index 0000000..629c375
--- /dev/null
+++ b/applications/goldman/source/renderer.cpp
@@ -0,0 +1,102 @@
+#include "renderer.hpp"
+
+renderer::renderer(
+  daguerre::image<daguerre::hilbert_color> &&fb,
+  daguerre::image<daguerre::hilbert_color> &&bg,
+  daguerre::hilbert_color bgc,
+  daguerre::image<daguerre::hilbert_color> &&c,
+  daguerre::hilbert_color cbg)
+
+: framebuffer(std::move(fb)),
+  double_buffer(framebuffer.width, framebuffer.height),
+  background(std::move(bg)), cursor(std::move(c)), cursor_background(cbg),
+  cursor_x(framebuffer.width / 2), cursor_y(framebuffer.height / 2) {
+
+  euler::syscall::create_private_socket(dispatcher_handle_1, dispatcher_handle_2);
+
+  if (background.width != framebuffer.width ||
+      background.height != framebuffer.height) {
+
+    daguerre::image<daguerre::hilbert_color>
+      new_background(framebuffer.width, framebuffer.height);
+
+    new_background.fill(bgc);
+
+    int from_x = 0;
+    int from_y = 0;
+    int to_x = framebuffer.width / 2 - background.width / 2;
+    int to_y = framebuffer.height / 2 - background.height / 2;
+    int width = background.width;
+    int height = background.height;
+
+    daguerre::make_safe(to_x, from_x, width, 0, framebuffer.width);
+    daguerre::make_safe(to_y, from_y, height, 0, framebuffer.height);
+
+    new_background.copy_from(background, to_x, to_y, from_x, from_y, width, height);
+    background = std::move(new_background);
+
+  }
+
+}
+
+template <class color_t>
+void overlay_trans(color_t &to, const color_t &from, const color_t &param) {
+  if (from != param)
+    to = from;
+}
+
+void renderer::do_render() {
+
+  double_buffer.copy_from(background, 0, 0);
+
+  for (auto it = windows.begin(); it != windows.end(); ++it)
+
+    double_buffer.copy_from(
+      (*it)->contents, (*it)->x, (*it)->y, 0, 0,
+      std::min((*it)->contents.width, double_buffer.width - (*it)->x),
+      std::min((*it)->contents.height, double_buffer.height - (*it)->y));
+
+  double_buffer.convert_from(
+    cursor_background, cursor, cursor_x, cursor_y, 0, 0,
+    std::min(cursor.width, framebuffer.width - cursor_x),
+    std::min(cursor.height, framebuffer.height - cursor_y),
+    &overlay_trans);
+
+}
+
+[[noreturn]] void renderer::render_thread_main() {
+  euler::syscall::set_thread_name("render thread");
+  while (true) {
+    uint8_t byte;
+    euler::syscall::read_from_stream(dispatcher_handle_2, 1, &byte);
+    mut.lock();
+    euler::syscall::clear_socket_read_queue(dispatcher_handle_2);
+    do_render();
+    mut.unlock();
+    framebuffer.copy_from(double_buffer, 0, 0);
+  }
+}
+
+void renderer::bump_cursor(int x_offset, int y_offset) {
+
+  cursor_x += x_offset;
+  if (cursor_x < 0)
+    cursor_x = 0;
+  else if (cursor_x >= framebuffer.width)
+    cursor_x = framebuffer.width - 1;
+
+  cursor_y += y_offset;
+  if (cursor_y < 0)
+    cursor_y = 0;
+  else if (cursor_y >= framebuffer.height)
+    cursor_y = framebuffer.height - 1;
+
+}
+
+void renderer::add_window(const window *w) {
+  windows.push_back(w);
+}
+
+void renderer::remove_window(const window *w) {
+  windows.remove(w);
+}
diff --git a/applications/goldman/source/renderer.hpp b/applications/goldman/source/renderer.hpp
new file mode 100644
index 0000000..14a5964
--- /dev/null
+++ b/applications/goldman/source/renderer.hpp
@@ -0,0 +1,61 @@
+#pragma once
+
+#include <daguerre/image.hpp>
+#include "window.hpp"
+#include <mutex>
+#include <list>
+
+class renderer {
+
+  daguerre::image<daguerre::hilbert_color> framebuffer;
+  daguerre::image<daguerre::hilbert_color> double_buffer;
+
+  daguerre::image<daguerre::hilbert_color> background;
+  daguerre::image<daguerre::hilbert_color> cursor;
+  daguerre::hilbert_color cursor_background;
+
+  int cursor_x;
+  int cursor_y;
+
+  //bottom to top
+  std::list<const window *> windows;
+
+  std::mutex mut;
+
+  euler::syscall::stream_handle
+    dispatcher_handle_1, dispatcher_handle_2;
+
+  void do_render();
+
+public:
+  renderer(
+    daguerre::image<daguerre::hilbert_color> &&framebuffer,
+    daguerre::image<daguerre::hilbert_color> &&background,
+    daguerre::hilbert_color background_color,
+    daguerre::image<daguerre::hilbert_color> &&cursor,
+    daguerre::hilbert_color cursor_background);
+
+  inline ~renderer() {
+    euler::syscall::close_stream(dispatcher_handle_1);
+    euler::syscall::close_stream(dispatcher_handle_2);
+  }
+
+  renderer(const renderer &) = delete;
+  renderer &operator =(const renderer &) = delete;
+
+  [[noreturn]] void render_thread_main();
+
+  inline void lock()   { mut.lock();   }
+  inline void unlock() { mut.unlock(); }
+
+  inline void dispatch_render() {
+    uint8_t byte = 0;
+    euler::syscall::write_to_stream(dispatcher_handle_1, 1, &byte);
+  }
+
+  void bump_cursor(int x_offset, int y_offset);
+
+  void add_window(const window *w);
+  void remove_window(const window *w);
+
+};
diff --git a/applications/goldman/source/socket.cpp b/applications/goldman/source/socket.cpp
new file mode 100644
index 0000000..b175fe9
--- /dev/null
+++ b/applications/goldman/source/socket.cpp
@@ -0,0 +1,162 @@
+#include <daguerre/image.hpp>
+#include "socket.hpp"
+#include "window.hpp"
+#include "main.hpp"
+#include <memory>
+#include <vector>
+
+struct socket_state {
+
+  euler::syscall::stream_handle socket;
+  std::vector<window *> windows;
+  daguerre::hilbert_color window_bg = euler::syscall::encode_color(0, 0, 0);
+
+  bool try_open_window() {
+
+    struct [[gnu::packed]] {
+      uint32_t width;
+      uint32_t height;
+    } body;
+
+    if (euler::syscall::read_from_stream(socket, sizeof(body), &body) !=
+        euler::syscall::stream_result::success)
+      return false;
+
+    window *w = new window(body.width, body.height);
+    w->contents.fill(window_bg);
+
+    uint16_t wid = 0;
+
+    while (wid < windows.size())
+      if (windows[wid] != 0)
+        ++wid;
+      else
+        break;
+
+    if (wid == windows.size())
+      windows.push_back(w);
+    else
+      windows[wid] = w;
+
+    r->lock();
+    r->add_window(w);
+    r->unlock();
+
+    struct [[gnu::packed]] {
+      uint8_t type;
+      uint16_t the_window;
+    } response {
+      .type = 0x00,
+      .the_window = wid
+    };
+
+    return
+      euler::syscall::write_to_stream(socket, sizeof(response), &response) ==
+      euler::syscall::stream_result::success;
+
+  }
+
+  bool try_update_window_region() {
+
+    struct [[gnu::packed]] {
+      uint16_t window;
+      uint32_t start_x;
+      uint32_t start_y;
+      uint32_t width;
+      uint32_t height;
+    } body_head;
+
+    if (euler::syscall::read_from_stream(socket, sizeof(body_head), &body_head) !=
+        euler::syscall::stream_result::success)
+      return false;
+
+    std::vector<daguerre::hilbert_color> data(body_head.width * body_head.height);
+
+    if (euler::syscall::read_from_stream(socket, data.size() * 4, data.data()) !=
+        euler::syscall::stream_result::success)
+      return false;
+
+    daguerre::image<daguerre::hilbert_color>
+      data_as_image(body_head.width, body_head.height, data.data(), body_head.width, false);
+
+    if (body_head.window >= windows.size() || !windows[body_head.window])
+      return false;
+
+    window *w = windows[body_head.window];
+
+    r->lock();
+
+    if ((int)body_head.start_x + data_as_image.width > w->contents.width ||
+        (int)body_head.start_y + data_as_image.height > w->contents.height) {
+      r->unlock();
+      return false;
+    }
+
+    w->contents.copy_from(data_as_image, body_head.start_x, body_head.start_y);
+
+    r->unlock();
+    r->dispatch_render();
+    return true;
+
+  }
+
+  bool try_close_window() {
+
+    uint16_t wid;
+
+    if (euler::syscall::read_from_stream(socket, 2, &wid) !=
+        euler::syscall::stream_result::success)
+      return false;
+
+    if (wid >= windows.size() || !windows[wid])
+      return false;
+
+    r->lock();
+
+    r->remove_window(windows[wid]);
+    windows[wid] = 0;
+
+    r->unlock();
+    r->dispatch_render();
+    return true;
+
+  }
+
+  bool try_process_request() {
+
+    uint8_t type;
+    if (euler::syscall::read_from_stream(socket, 1, &type) !=
+        euler::syscall::stream_result::success)
+      return false;
+
+    switch (type) {
+    case 0x00: return try_open_window();
+    case 0x01: return try_update_window_region();
+    case 0x02: return try_close_window();
+    default: return false;
+    }
+
+  }
+
+};
+
+[[noreturn]] void socket_thread_main(euler::syscall::stream_handle socket) {
+
+  euler::syscall::set_thread_name("socket thread");
+
+  socket_state *state = new socket_state {
+    .socket = socket, .windows = {} };
+  while (state->try_process_request()) ;
+
+  r->lock();
+  for (unsigned i = 0; i < state->windows.size(); ++i) {
+    r->remove_window(state->windows[i]);
+    delete state->windows[i];
+  }
+  r->unlock();
+
+  delete state;
+  euler::syscall::close_stream(socket);
+  euler::syscall::end_this_thread(0);
+
+}
diff --git a/applications/goldman/source/socket.hpp b/applications/goldman/source/socket.hpp
new file mode 100644
index 0000000..a9dbeb2
--- /dev/null
+++ b/applications/goldman/source/socket.hpp
@@ -0,0 +1,5 @@
+#pragma once
+
+#include <euler/syscall.hpp>
+
+[[noreturn]] void socket_thread_main(euler::syscall::stream_handle socket);
diff --git a/applications/goldman/source/window.hpp b/applications/goldman/source/window.hpp
new file mode 100644
index 0000000..008af2f
--- /dev/null
+++ b/applications/goldman/source/window.hpp
@@ -0,0 +1,14 @@
+#pragma once
+
+#include <daguerre/image.hpp>
+
+struct window {
+
+  daguerre::image<daguerre::hilbert_color> contents;
+
+  int x;
+  int y;
+
+  window(int width, int height) : contents(width, height), x(0), y(0) {}
+
+};
-- 
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