begin work on UI

rpi/CMakeLists.txt

@@ -5,6 +5,7 @@ find_package(FFmpeg REQUIRED COMPONENTS avformat avcodec avutil avfilter swscale
 add_executable(vanilla-pi
     drm.c
     main.c
+    ui.c
 )
 
 install(TARGETS vanilla-pi)

rpi/main.c

@@ -17,6 +17,7 @@
 #include <unistd.h>
 
 #include "drm.h"
+#include "ui.h"
 
 AVFrame *present_frame;
 AVFrame *decoding_frame;
@@ -156,7 +157,6 @@ int run_backend(void *data)
 	SDL_Thread *decode_thread = SDL_CreateThread(decode_loop, "vanilla-decode", NULL);
 
 	while (vanilla_wait_event(&event)) {
-		printf("front end got event\n");
 		if (event.type == VANILLA_EVENT_VIDEO) {
 			SDL_LockMutex(decode_loop_mutex);
 
@@ -170,10 +170,6 @@ int run_backend(void *data)
 
 			SDL_CondBroadcast(decode_loop_cond);
 			SDL_UnlockMutex(decode_loop_mutex);
-			
-			/*uint8_t *data = av_malloc(event.size);
-			memcpy(data, event.data, event.size);
-			decode(data, event.size);*/
 		} else if (event.type == VANILLA_EVENT_AUDIO) {
 			if (audio) {
 				if (SDL_QueueAudio(audio, event.data, event.size) < 0) {
@@ -431,8 +427,15 @@ int main(int argc, const char **argv)
 
 	SDL_GameController *controller = find_valid_controller();
 
+	vui_context_t *vui = vui_alloc();
+
 	Uint32 ticks = SDL_GetTicks();
 	while (running) {
+		vui_reset(vui);
+
+		int sync_btn = vui_draw_button(vui, 100, 100, 100, 100, "Sync");
+		int connect_btn = vui_draw_button(vui, 300, 100, 100, 100, "Connect");
+
 		SDL_Event event;
 #ifdef RASPBERRY_PI
 		if (SDL_WaitEvent(&event)) {
@@ -491,6 +494,18 @@ int main(int argc, const char **argv)
 					running = 0;
 				}
 				break;
+			case SDL_MOUSEBUTTONDOWN:
+			{
+				int btn = vui_process_click(vui, event.button.x, event.button.y);
+				if (btn != -1) {
+					if (btn == sync_btn) {
+						// Go to sync menu
+					} else if (btn == connect_btn) {
+						// Go to connect menu
+					}
+				}
+				break;
+			}
 			}
     
 			if (controller) {
@@ -518,6 +533,8 @@ int main(int argc, const char **argv)
 #endif
 	}
 
+	vui_free(vui);
+
 	// Terminate background threads and wait for them to end gracefully
 	vanilla_stop();
 

rpi/ui.c

@@ -0,0 +1,73 @@
+#include "ui.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_BUTTON_COUNT 8
+#define MAX_BUTTON_TEXT 16
+
+typedef struct {
+    int x;
+    int y;
+    int w;
+    int h;
+    char text[MAX_BUTTON_TEXT];
+} vui_button_t;
+
+typedef struct vui_context_t {
+    vui_button_t buttons[MAX_BUTTON_COUNT];
+    int button_count;
+} vui_context_t;
+
+vui_context_t *vui_alloc()
+{
+    return malloc(sizeof(vui_context_t));
+}
+
+void vui_free(vui_context_t *vui)
+{
+    vui_reset(vui);
+    free(vui);
+}
+
+int vui_reset(vui_context_t *ctx)
+{
+    ctx->button_count = 0;
+}
+
+int vui_draw_button(vui_context_t *ctx, int x, int y, int w, int h, const char *text)
+{
+    if (ctx->button_count == MAX_BUTTON_COUNT) {
+        return -1;
+    }
+
+    int index = ctx->button_count;
+
+    vui_button_t *btn = &ctx->buttons[index];
+
+    btn->x = x;
+    btn->y = y;
+    btn->w = w;
+    btn->h = h;
+
+    // Copy text (enforce null terminator)
+    strncpy(btn->text, text, MAX_BUTTON_TEXT);
+    btn->text[MAX_BUTTON_TEXT-1] = 0;
+
+    ctx->button_count++;
+
+    return index;
+}
+
+int vui_process_click(vui_context_t *ctx, int x, int y)
+{
+    for (int i = 0; i < ctx->button_count; i++) {
+        vui_button_t *btn = &ctx->buttons[i];
+
+        if (x >= btn->x && y >= btn->y && x < btn->x + btn->w && y < btn->y + btn->h) {
+            return i;
+        }
+    }
+
+    return -1;
+}

rpi/ui.h

@@ -0,0 +1,12 @@
+#ifndef VANILLA_PI_UI_H
+#define VANILLA_PI_UI_H
+
+typedef struct vui_context_t vui_context_t;
+
+vui_context_t *vui_alloc();
+int vui_reset(vui_context_t *ctx);
+int vui_draw_button(vui_context_t *ctx, int x, int y, int w, int h, const char *text);
+int vui_process_click(vui_context_t *ctx, int x, int y);
+void vui_free(vui_context_t *ctx);
+
+#endif // VANILLA_PI_UI_H