Start on syntax highlighting, output correct key button event

4 files changed, 195 insertions, 26 deletions

diff --git a/src/graphics/font.c b/src/graphics/font.c
index 8344a04..2ed54d2 100644
--- a/src/graphics/font.c
+++ b/src/graphics/font.c
@@ -47,8 +47,8 @@ int mgl_font_load_from_file(mgl_font *self, const char *filepath, unsigned int c
     /* TODO: Optimize */
     /* Find optimal size for atlas, starting from small to large */
     for(int i = 0; i < 4; ++i) {
-        self->font_atlas.width = (8 + (8 * i)) * self->character_size;
-        self->font_atlas.height = (8 + (8 * i)) * self->character_size;
+        self->font_atlas.width = (14 + (8 * i)) * self->character_size;
+        self->font_atlas.height = (14 + (8 * i)) * self->character_size;
         unsigned char *new_atlas = realloc(self->font_atlas.atlas, self->font_atlas.width * self->font_atlas.height);
         if(!new_atlas) {
             fprintf(stderr, "Error: failed to load font %s, error: out of memory\n", filepath);
@@ -67,6 +67,8 @@ int mgl_font_load_from_file(mgl_font *self, const char *filepath, unsigned int c
             return -1;
         }
 
+        stbtt_PackSetOversampling(&pc, 2, 2);
+
         if(!stbtt_PackFontRange(&pc, filedata.data, 0, self->character_size, 0, self->num_packed_chars, self->packed_chars)) {
             stbtt_PackEnd(&pc);
             continue;
@@ -92,7 +94,6 @@ int mgl_font_load_from_file(mgl_font *self, const char *filepath, unsigned int c
     }
 
     /* TODO: Use stbtt_GetCodepointSDF */
-    /* TODO: Use stbtt_PackSetOversampling */
     
     mgl_filedata_free(&filedata);
     return 0;
@@ -119,7 +120,7 @@ int mgl_font_get_glyph(const mgl_font *self, uint32_t codepoint, mgl_font_glyph
     float x = 0.0f;
     float y = 0.0f;
     stbtt_aligned_quad quad;
-    stbtt_GetPackedQuad(packed_chars, self->font_atlas.width, self->font_atlas.height, codepoint, &x, &y, &quad, 1);
+    stbtt_GetPackedQuad(packed_chars, self->font_atlas.width, self->font_atlas.height, codepoint, &x, &y, &quad, 0);
 
     glyph->position         = (mgl_vec2f){ quad.x0, quad.y0 };
     glyph->size             = (mgl_vec2f){ quad.x1 - quad.x0, quad.y1 - quad.y0 };
diff --git a/src/graphics/text.c b/src/graphics/text.c
index 76fd852..9a849a9 100644
--- a/src/graphics/text.c
+++ b/src/graphics/text.c
@@ -2,20 +2,48 @@
 #include "../../include/mgl/graphics/font.h"
 #include "../../include/mgl/mgl.h"
 
-int mgl_text_init(mgl_text *self, mgl_font *font, const char *text, float x, float y) {
+/*
+    TODO: Do syntax highlight in constructor/mgl_text_set_string for optimization.
+    Syntax highlighting should the first text that is visible in the text editor and find the start and end,
+    and start syntax highlight from there until the last visible text.
+    In that case there should also be a function to rerun the syntax highlighting, to update it
+    when an asynchronous process finishes that parses code, such as a lsp client parsing C++ code which
+    takes a while.
+*/
+
+static bool default_syntax_highlight(void *userdata, const char *str, size_t size, mgl_color *color) {
+    (void)userdata;
+    (void)str;
+    (void)size;
+    (void)color;
+    return false;
+}
+
+int mgl_text_init(mgl_text *self, mgl_font *font, const char *str, size_t str_size, mgl_text_options *options) {
     self->font = font;
-    self->text = text;
+    self->text = str;
+    self->text_size = str_size;
     self->color = (mgl_color){ 255, 255, 255, 255 };
-    self->position = (mgl_vec2f){ x, y };
+    self->position = (mgl_vec2f){ 0.0f, 0.0f };
+
+    if(options)
+        self->options = *options;
+    else
+        self->options.userdata = NULL;
+
+    if(!options || !options->syntax_highlight)
+        self->options.syntax_highlight = default_syntax_highlight;
+
     return 0;
 }
 
 void mgl_text_deinit(mgl_text *self) {
-
+    (void)self;
 }
 
-void mgl_text_set_string(mgl_text *self, const char *str) {
+void mgl_text_set_string(mgl_text *self, const char *str, size_t str_size) {
     self->text = str;
+    self->text_size = str_size;
 }
 
 void mgl_text_set_font(mgl_text *self, mgl_font *font) {
@@ -44,25 +72,43 @@ static void mgl_text_draw_glyph(mgl_context *context, mgl_font_glyph *glyph, mgl
     context->gl.glVertex3f(position.x + glyph->position.x, position.y + glyph->position.y + glyph->size.y, 0.0f);
 }
 
+static void mgl_text_run_syntax_highlight(mgl_context *context, mgl_text *text, const char *str, size_t size, mgl_color *color, bool *color_changed) {
+    if(text->options.syntax_highlight(text->options.userdata, str, size, color)) {
+        context->gl.glColor4ub(color->r, color->g, color->b, color->a);
+        *color_changed = true;
+    } else {
+        if(*color_changed) {
+            *color = text->color;
+            context->gl.glColor4ub(color->r, color->g, color->b, color->a);
+            *color_changed = false;
+        }
+    }
+}
+
 /* TODO: Use opengl buffer object instead */
 /* TODO: Cache texture bind to not bind texture if its already bound and do not bind texture 0 */
 void mgl_text_draw(mgl_context *context, mgl_text *text) {
-    if(!text->text || !text->font)
+    if(!text->text || text->text_size == 0 || !text->font)
         return;
 
-    const char *str = text->text;
-
     mgl_font_glyph glyph;
     mgl_vec2f position = text->position;
     position.y += text->font->character_size;
 
+    mgl_color color = text->color;
+    bool color_changed = false;
+
+    if(text->options.before_syntax_highlight)
+        text->options.before_syntax_highlight(text->options.userdata);
+
     context->gl.glColor4ub(text->color.r, text->color.g, text->color.b, text->color.a);
     context->gl.glBindTexture(GL_TEXTURE_2D, text->font->texture.id);
     context->gl.glBegin(GL_QUADS);
-    while(*str) {
-        unsigned char c = *(unsigned char*)str;
+    for(size_t i = 0; i < text->text_size; ++i) {
+        unsigned char c = *(unsigned char*)&text->text[i];
         if((c >= 32 && c < 128)) {
             if(mgl_font_get_glyph(text->font, c, &glyph) == 0) {
+                mgl_text_run_syntax_highlight(context, text, (const char*)&c, 1, &color, &color_changed);
                 mgl_text_draw_glyph(context, &glyph, position);
                 position.x += glyph.advance;
             }
@@ -78,7 +124,6 @@ void mgl_text_draw(mgl_context *context, mgl_text *text) {
             position.x = text->position.x;
             position.y += text->font->character_size;
         }
-        ++str;
     }
     context->gl.glEnd();
     context->gl.glBindTexture(GL_TEXTURE_2D, 0);
diff --git a/src/mgl.c b/src/mgl.c
index 6407d9e..7940def 100644
--- a/src/mgl.c
+++ b/src/mgl.c
@@ -8,6 +8,7 @@
 static mgl_context context;
 static int init_count = 0;
 static XErrorHandler prev_xerror = NULL;
+static XIOErrorHandler prev_xioerror = NULL;
 
 static int ignore_xerror(Display *display, XErrorEvent *ee) {
     (void)display;
@@ -15,6 +16,11 @@ static int ignore_xerror(Display *display, XErrorEvent *ee) {
     return 0;
 }
 
+static int ignore_xioerror(Display *display) {
+    (void)display;
+    return 0;
+}
+
 static int glx_context_init() {
     const int attr[] = {
         GLX_RGBA,
@@ -60,6 +66,13 @@ int mgl_init(void) {
         }
 
         prev_xerror = XSetErrorHandler(ignore_xerror);
+        prev_xioerror = XSetIOErrorHandler(ignore_xioerror);
+
+        context.wm_delete_window_atom = XInternAtom(context.connection, "WM_DELETE_WINDOW", False);
+        if(!context.wm_delete_window_atom) {
+            mgl_deinit();
+            return -1;
+        }
 
         if(mgl_gl_load(&context.gl) != 0) {
             mgl_deinit();
@@ -76,10 +89,16 @@ int mgl_init(void) {
 
 void mgl_deinit(void) {
     if(init_count == 1) {
-        glx_context_deinit();
-        mgl_gl_unload(&context.gl);
-        XSetErrorHandler(prev_xerror);
         if(context.connection) {
+            glx_context_deinit();
+            mgl_gl_unload(&context.gl);
+
+            XSetIOErrorHandler(prev_xioerror);
+            prev_xioerror = NULL;
+
+            XSetErrorHandler(prev_xerror);
+            prev_xerror = NULL;
+
             XCloseDisplay(context.connection);
             context.connection = NULL;
         }
diff --git a/src/window/window.c b/src/window/window.c
index 94756cd..9a650ae 100644
--- a/src/window/window.c
+++ b/src/window/window.c
@@ -1,4 +1,5 @@
 #include "../../include/mgl/window/window.h"
+#include "../../include/mgl/window/event.h"
 #include "../../include/mgl/mgl.h"
 #include <X11/Xutil.h>
 #include <errno.h>
@@ -140,23 +141,127 @@ void mgl_window_deinit(mgl_window *self) {
     }
 }
 
-static void mgl_window_on_receive_event(mgl_window *self, XEvent *xev) {
+static mgl_key x11_keysym_to_mgl_key(KeySym key_sym) {
+    if(key_sym >= XK_A && key_sym <= XK_Z)
+        return MGL_KEY_A + (key_sym - XK_A);
+    /* TODO: Check if this ever happens */
+    if(key_sym >= XK_a && key_sym <= XK_z)
+        return MGL_KEY_A + (key_sym - XK_a);
+    if(key_sym >= XK_0 && key_sym <= XK_9)
+        return MGL_KEY_NUM0 + (key_sym - XK_0);
+    if(key_sym >= XK_KP_0 && key_sym <= XK_KP_9)
+        return MGL_KEY_NUMPAD0 + (key_sym - XK_KP_0);
+
+    /* TODO: Fill in the rest */
+    switch(key_sym) {
+        case XK_space:      return MGL_KEY_SPACE;
+        case XK_BackSpace:  return MGL_KEY_BACKSPACE;
+        case XK_Tab:        return MGL_KEY_TAB;
+        case XK_Return:     return MGL_KEY_ENTER;
+        case XK_Delete:     return MGL_KEY_DELETE;
+        case XK_Home:       return MGL_KEY_HOME;
+        case XK_Left:       return MGL_KEY_LEFT;
+        case XK_Up:         return MGL_KEY_UP;
+        case XK_Right:      return MGL_KEY_RIGHT;
+        case XK_Down:       return MGL_KEY_DOWN;
+        case XK_Page_Up:    return MGL_KEY_PAGEUP;
+        case XK_Page_Down:  return MGL_KEY_PAGEDOWN;
+        case XK_End:        return MGL_KEY_END;
+        case XK_F1:         return MGL_KEY_F1;
+        case XK_F2:         return MGL_KEY_F2;
+        case XK_F3:         return MGL_KEY_F3;
+        case XK_F4:         return MGL_KEY_F4;
+        case XK_F5:         return MGL_KEY_F5;
+        case XK_F6:         return MGL_KEY_F6;
+        case XK_F7:         return MGL_KEY_F7;
+        case XK_F8:         return MGL_KEY_F8;
+        case XK_F9:         return MGL_KEY_F9;
+        case XK_F10:        return MGL_KEY_F10;
+        case XK_F11:        return MGL_KEY_F11;
+        case XK_F12:        return MGL_KEY_F12;
+        case XK_F13:        return MGL_KEY_F13;
+        case XK_F14:        return MGL_KEY_F14;
+        case XK_F15:        return MGL_KEY_F15;
+    }
+    return MGL_KEY_UNKNOWN;
+}
+
+static mgl_mouse_button x11_button_to_mgl_button(unsigned int button) {
+    switch(button) {
+        case 1: return MGL_BUTTON_LEFT;
+        case 2: return MGL_BUTTON_MIDDLE;
+        case 3: return MGL_BUTTON_RIGHT;
+        case 8: return MGL_BUTTON_XBUTTON1;
+        case 9: return MGL_BUTTON_XBUTTON2;
+    }
+    return MGL_BUTTON_UNKNOWN;
+}
+
+/* Returns true if processed */
+static bool mgl_window_on_receive_event(mgl_window *self, XEvent *xev, mgl_event *event, mgl_context *context) {
+    /* TODO: Handle wm_delete_window event */
     switch(xev->type) {
+        case KeyPress: {
+            /* TODO: Fill with correct data */
+            event->type = MGL_EVENT_KEY_PRESSED;
+            event->key.code = x11_keysym_to_mgl_key(XKeycodeToKeysym(context->connection, xev->xkey.keycode, 0));
+            event->key.alt = ((xev->xkey.state & Mod1Mask) != 0);
+            event->key.control = ((xev->xkey.state & ControlMask) != 0);
+            event->key.shift = ((xev->xkey.state & ShiftMask) != 0);
+            event->key.system = ((xev->xkey.state & Mod5Mask) != 0); /* TODO: Fix, doesn't work */
+            return true;
+        }
+        case KeyRelease: {
+            /* TODO: Fill with correct data */
+            event->type = MGL_EVENT_KEY_RELEASED;
+            event->key.code = x11_keysym_to_mgl_key(XKeycodeToKeysym(context->connection, xev->xkey.keycode, 0));
+            event->key.alt = ((xev->xkey.state & Mod1Mask) != 0);
+            event->key.control = ((xev->xkey.state & ControlMask) != 0);
+            event->key.shift = ((xev->xkey.state & ShiftMask) != 0);
+            event->key.system = ((xev->xkey.state & Mod5Mask) != 0); /* TODO: Fix, doesn't work */
+            return true;
+        }
+        case ButtonPress: {
+            event->type = MGL_EVENT_MOUSE_BUTTON_PRESSED;
+            event->mouse_button.button = x11_button_to_mgl_button(xev->xbutton.button);
+            event->mouse_button.x = xev->xbutton.x;
+            event->mouse_button.y = xev->xbutton.y;
+            return true;
+        }
+        case ButtonRelease: {
+            event->type = MGL_EVENT_MOUSE_BUTTON_RELEASED;
+            event->mouse_button.button = x11_button_to_mgl_button(xev->xbutton.button);
+            event->mouse_button.x = xev->xbutton.x;
+            event->mouse_button.y = xev->xbutton.y;
+            return true;
+        }
         case ConfigureNotify: {
             while(XCheckTypedWindowEvent(mgl_get_context()->connection, self->window, ConfigureNotify, xev)) {}
             if(xev->xconfigure.width != self->size.x || xev->xconfigure.height != self->size.x) {
                 mgl_window_on_resize(self, xev->xconfigure.width, xev->xconfigure.height);
-                /*fprintf(stderr, "resize!\n");*/
+
+                event->type = MGL_EVENT_RESIZED;
+                event->size.width = self->size.x;
+                event->size.height = self->size.y;
+                event->mouse_move.y = self->cursor_position.y;
+                return true;
             }
-            break;
+            return false;
         }
         case MotionNotify: {
             while(XCheckTypedWindowEvent(mgl_get_context()->connection, self->window, MotionNotify, xev)) {}
             self->cursor_position.x = xev->xmotion.x;
             self->cursor_position.y = xev->xmotion.y;
-            break;
+
+            event->type = MGL_EVENT_MOUSE_MOVED;
+            event->mouse_move.x = self->cursor_position.x;
+            event->mouse_move.y = self->cursor_position.y;
+            return true;
         }
     }
+    /*fprintf(stderr, "unhandled event type: %d\n", xev->type);*/
+    event->type = MGL_EVENT_UNKNOWN;
+    return false;
 }
 
 void mgl_window_clear(mgl_window *self, mgl_color color) {
@@ -166,13 +271,12 @@ void mgl_window_clear(mgl_window *self, mgl_color color) {
 }
 
 bool mgl_window_poll_event(mgl_window *self, mgl_event *event) {
-    /* TODO: Use |event| */
-
-    Display *display = mgl_get_context()->connection;
+    mgl_context *context = mgl_get_context();
+    Display *display = context->connection;
     if(XPending(display)) {
         XEvent xev; /* TODO: Move to window struct */
         XNextEvent(display, &xev);
-        mgl_window_on_receive_event(self, &xev);
+        mgl_window_on_receive_event(self, &xev, event, context);
         return true;
     } else {
         return false;