[surface] abstracted child window layer from win32 surfaces

src/egl_surface.c

@@ -19,8 +19,7 @@ typedef struct mg_egl_surface
 {
 	mg_surface_data interface;
 
-	HWND hWnd;
+	mp_layer layer;
-	vec2 contentsScaling;
 
 	EGLDisplay eglDisplay;
 	EGLConfig eglConfig;
@@ -46,7 +45,7 @@ void mg_egl_surface_destroy(mg_surface_data* interface)
 	eglDestroyContext(surface->eglDisplay, surface->eglContext);
 	eglDestroySurface(surface->eglDisplay, surface->eglSurface);
 
-	DestroyWindow(surface->hWnd);
+	mp_layer_cleanup(&surface->layer);
 	free(surface);
 }
 
@@ -72,75 +71,33 @@ void mg_egl_surface_swap_interval(mg_surface_data* interface, int swap)
 vec2 mg_egl_surface_contents_scaling(mg_surface_data* interface)
 {
 	mg_egl_surface* surface = (mg_egl_surface*)interface;
-	return(surface->contentsScaling);
+	return(mp_layer_contents_scaling(&surface->layer));
 }
 
 mp_rect mg_egl_surface_get_frame(mg_surface_data* interface)
 {
-	mp_rect res = {0};
 	mg_egl_surface* surface = (mg_egl_surface*)interface;
-	if(surface)
+	return(mp_layer_get_frame(&surface->layer));
-	{
-		RECT rect = {0};
-		GetClientRect(surface->hWnd, &rect);
-
-		vec2 scale = surface->contentsScaling;
-
-		res = (mp_rect){rect.left/scale.x,
-	               	    rect.bottom/scale.y,
-	               	    (rect.right - rect.left)/scale.x,
-	               	    (rect.bottom - rect.top)/scale.y};
-	}
-	return(res);
 }
 
 void mg_egl_surface_set_frame(mg_surface_data* interface, mp_rect frame)
 {
 	mg_egl_surface* surface = (mg_egl_surface*)interface;
-	if(surface)
+	mp_layer_set_frame(&surface->layer, frame);
-	{
-		HWND parent = GetParent(surface->hWnd);
-		RECT parentContentRect;
-		GetClientRect(parent, &parentContentRect);
-		int parentHeight = 	parentContentRect.bottom - parentContentRect.top;
-
-		SetWindowPos(surface->hWnd,
-			         HWND_TOP,
-			         frame.x * surface->contentsScaling.x,
-			         parentHeight - (frame.y + frame.h) * surface->contentsScaling.y,
-			         frame.w * surface->contentsScaling.x,
-			         frame.h * surface->contentsScaling.y,
-			         SWP_NOACTIVATE | SWP_NOZORDER);
-	}
 }
 
 void mg_egl_surface_set_hidden(mg_surface_data* interface, bool hidden)
 {
 	mg_egl_surface* surface = (mg_egl_surface*)interface;
-	if(surface)
+	mp_layer_set_hidden(&surface->layer, hidden);
-	{
-		ShowWindow(surface->hWnd, hidden ? SW_HIDE : SW_NORMAL);
-	}
 }
 
 bool mg_egl_surface_get_hidden(mg_surface_data* interface)
 {
-	bool hidden = false;
 	mg_egl_surface* surface = (mg_egl_surface*)interface;
-	if(surface)
+	return(mp_layer_get_hidden(&surface->layer));
-	{
-		hidden = !IsWindowVisible(surface->hWnd);
-	}
-	return(hidden);
 }
 
-
-LRESULT mg_egl_surface_window_proc(HWND windowHandle, UINT message, WPARAM wParam, LPARAM lParam)
-{
-	return(DefWindowProc(windowHandle, message, wParam, lParam));
-}
-
-
 mg_surface mg_egl_surface_create_for_window(mp_window window)
 {
 	mg_surface res = mg_surface_nil();
@@ -148,31 +105,6 @@ mg_surface mg_egl_surface_create_for_window(mp_window window)
 	mp_window_data* windowData = mp_window_ptr_from_handle(window);
 	if(windowData)
 	{
-		//NOTE(martin): create a child window for the surface
-		WNDCLASS childWindowClass = {.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC,
-		                        .lpfnWndProc = mg_egl_surface_window_proc,
-		                        .hInstance = GetModuleHandleW(NULL),
-		                        .lpszClassName = "egl_surface_window_class",
-		                        .hCursor = LoadCursor(0, IDC_ARROW)};
-
-		if(!RegisterClass(&childWindowClass))
-		{
-			//TODO: error
-		}
-
-		mp_rect frame = mp_window_get_content_rect(window);
-
-		u32 dpi = GetDpiForWindow(windowData->win32.hWnd);
-		vec2 contentsScaling = (vec2){(float)dpi/96., (float)dpi/96.};
-
-		HWND childWindow = CreateWindow("egl_surface_window_class", "Test",
-	                                 	       WS_CHILD|WS_VISIBLE,
-	                                 	       0, 0, frame.w*contentsScaling.x, frame.h*contentsScaling.y,
-	                                 	       windowData->win32.hWnd,
-	                                 	       0,
-	                                 	       childWindowClass.hInstance,
-	                                 	       0);
-
 		mg_egl_surface* surface = malloc_type(mg_egl_surface);
 		memset(surface, 0, sizeof(mg_egl_surface));
 
@@ -187,8 +119,7 @@ mg_surface mg_egl_surface_create_for_window(mp_window window)
 		surface->interface.getHidden = mg_egl_surface_get_hidden;
 		surface->interface.setHidden = mg_egl_surface_set_hidden;
 
-		surface->hWnd = childWindow;
+		mp_layer_init_for_window(&surface->layer, windowData);
-		surface->contentsScaling = contentsScaling;
 
 		EGLAttrib displayAttribs[] = {
 			EGL_PLATFORM_ANGLE_TYPE_ANGLE, EGL_PLATFORM_ANGLE_TYPE_DEFAULT_ANGLE,
@@ -217,7 +148,7 @@ mg_surface mg_egl_surface_create_for_window(mp_window window)
 		EGLint const surfaceAttributes[] = {EGL_NONE};
 		surface->eglSurface = eglCreateWindowSurface(surface->eglDisplay,
 		                                             surface->eglConfig,
-		                                             surface->hWnd,
+		                                             mp_layer_native_surface(&surface->layer),
 		                                             surfaceAttributes);
 
 		eglBindAPI(EGL_OPENGL_ES_API);

src/glsl_shaders.h

@@ -2,7 +2,7 @@
 *
 *	file: glsl_shaders.h
 *	note: string literals auto-generated by embed_text.py
-*	date: 20/022023
+*	date: 21/022023
 *
 **********************************************************************/
 #ifndef __GLSL_SHADERS_H__

src/milepost.c

@@ -65,7 +65,7 @@
 	#endif
 
 	#if MG_COMPILE_BACKEND_GLES
-		#include"win32_egl_surface.c"
+		#include"egl_surface.c"
 	#endif
 
 #elif defined(OS_MACOS)

src/wgl_surface.c

@@ -115,10 +115,9 @@ typedef struct mg_wgl_surface
 {
 	mg_surface_data interface;
 
-	HWND hWnd;
+	mp_layer layer;
 	HDC hDC;
 	HGLRC glContext;
-	vec2 contentsScaling;
 
 	//NOTE: this may be a bit wasteful to have one api struct per surface, but win32 docs says that loading procs
 	//      from different contexts might select different implementations (eg. depending on context version/pixel format)
@@ -135,7 +134,7 @@ void mg_wgl_surface_destroy(mg_surface_data* interface)
 	}
 	wglDeleteContext(surface->glContext);
 
-	DestroyWindow(surface->hWnd);
+	mp_layer_cleanup(&surface->layer);
 
 	free(surface);
 }
@@ -163,69 +162,33 @@ void mg_wgl_surface_swap_interval(mg_surface_data* interface, int swap)
 vec2 mg_wgl_surface_contents_scaling(mg_surface_data* interface)
 {
 	mg_wgl_surface* surface = (mg_wgl_surface*)interface;
-	return(surface->contentsScaling);
+	return(mp_layer_contents_scaling(&surface->layer));
 }
 
 mp_rect mg_wgl_surface_get_frame(mg_surface_data* interface)
 {
-	mp_rect res = {0};
 	mg_wgl_surface* surface = (mg_wgl_surface*)interface;
-	if(surface)
+	return(mp_layer_get_frame(&surface->layer));
-	{
-		RECT rect = {0};
-		GetClientRect(surface->hWnd, &rect);
-
-		vec2 scale = surface->contentsScaling;
-
-		res = (mp_rect){rect.left/scale.x,
-	               	    rect.bottom/scale.y,
-	               	    (rect.right - rect.left)/scale.x,
-	               	    (rect.bottom - rect.top)/scale.y};
-	}
-	return(res);
 }
 
 void mg_wgl_surface_set_frame(mg_surface_data* interface, mp_rect frame)
 {
 	mg_wgl_surface* surface = (mg_wgl_surface*)interface;
-	if(surface)
+	mp_layer_set_frame(&surface->layer, frame);
-	{
-		HWND parent = GetParent(surface->hWnd);
-		RECT parentContentRect;
-		GetClientRect(parent, &parentContentRect);
-		int parentHeight = 	parentContentRect.bottom - parentContentRect.top;
-
-		SetWindowPos(surface->hWnd,
-			         HWND_TOP,
-			         frame.x * surface->contentsScaling.x,
-			         parentHeight - (frame.y + frame.h) * surface->contentsScaling.y,
-			         frame.w * surface->contentsScaling.x,
-			         frame.h * surface->contentsScaling.y,
-			         SWP_NOACTIVATE | SWP_NOZORDER);
-	}
 }
 
 void mg_wgl_surface_set_hidden(mg_surface_data* interface, bool hidden)
 {
 	mg_wgl_surface* surface = (mg_wgl_surface*)interface;
-	if(surface)
+	mp_layer_set_hidden(&surface->layer, hidden);
-	{
-		ShowWindow(surface->hWnd, hidden ? SW_HIDE : SW_NORMAL);
-	}
 }
 
 bool mg_wgl_surface_get_hidden(mg_surface_data* interface)
 {
-	bool hidden = false;
 	mg_wgl_surface* surface = (mg_wgl_surface*)interface;
-	if(surface)
+	return(mp_layer_get_hidden(&surface->layer));
-	{
-		hidden = !IsWindowVisible(surface->hWnd);
-	}
-	return(hidden);
 }
 
-
 void* mg_wgl_get_proc(const char* name)
 {
 	void* p = wglGetProcAddress(name);
@@ -242,11 +205,6 @@ void* mg_wgl_get_proc(const char* name)
 	return(p);
 }
 
-LRESULT mg_wgl_surface_window_proc(HWND windowHandle, UINT message, WPARAM wParam, LPARAM lParam)
-{
-	return(DefWindowProc(windowHandle, message, wParam, lParam));
-}
-
 mg_surface mg_wgl_surface_create_for_window(mp_window window)
 {
 	mg_surface surfaceHandle = mg_surface_nil();
@@ -256,30 +214,22 @@ mg_surface mg_wgl_surface_create_for_window(mp_window window)
 	{
 		wgl_init();
 
-		//NOTE(martin): create a child window for the surface
+		//NOTE: fill surface data and load api
-		WNDCLASS childWindowClass = {.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC,
+		mg_wgl_surface* surface = malloc_type(mg_wgl_surface);
-		                        .lpfnWndProc = mg_wgl_surface_window_proc,
-		                        .hInstance = GetModuleHandleW(NULL),
-		                        .lpszClassName = "wgl_surface_window_class",
-		                        .hCursor = LoadCursor(0, IDC_ARROW)};
 
-		if(!RegisterClass(&childWindowClass))
+		surface->interface.backend = MG_BACKEND_GL;
-		{
+		surface->interface.destroy = mg_wgl_surface_destroy;
-			//TODO: error
+		surface->interface.prepare = mg_wgl_surface_prepare;
-		}
+		surface->interface.present = mg_wgl_surface_present;
+		surface->interface.swapInterval = mg_wgl_surface_swap_interval;
+		surface->interface.contentsScaling = mg_wgl_surface_contents_scaling;
+		surface->interface.getFrame = mg_wgl_surface_get_frame;
+		surface->interface.setFrame = mg_wgl_surface_set_frame;
+		surface->interface.getHidden = mg_wgl_surface_get_hidden;
+		surface->interface.setHidden = mg_wgl_surface_set_hidden;
 
-		mp_rect frame = mp_window_get_content_rect(window);
+		mp_layer_init_for_window(&surface->layer, windowData);
-
+		surface->hDC = GetDC(surface->layer.hWnd);
-		u32 dpi = GetDpiForWindow(windowData->win32.hWnd);
-		vec2 contentsScaling = (vec2){(float)dpi/96., (float)dpi/96.};
-
-		HWND childWindow = CreateWindow("wgl_surface_window_class", "Test",
-	                                 	       WS_CHILD|WS_VISIBLE,
-	                                 	       0, 0, frame.w*contentsScaling.x, frame.h*contentsScaling.y,
-	                                 	       windowData->win32.hWnd,
-	                                 	       0,
-	                                 	       childWindowClass.hInstance,
-	                                 	       0);
 
 		//NOTE(martin): create the pixel format and gl context
 		PIXELFORMATDESCRIPTOR pixelFormatDesc =
@@ -312,17 +262,16 @@ mg_surface mg_wgl_surface_create_for_window(mp_window window)
 			WGL_STENCIL_BITS_ARB, 8,
 			0};
 
-		HDC hDC = GetDC(childWindow);
 		u32 numFormats = 0;
 		int pixelFormat = 0;
 
-		wglChoosePixelFormatARB(hDC, pixelFormatAttrs, 0, 1, &pixelFormat, &numFormats);
+		wglChoosePixelFormatARB(surface->hDC, pixelFormatAttrs, 0, 1, &pixelFormat, &numFormats);
 
 		if(!pixelFormat)
 		{
 			//TODO: error
 		}
-		SetPixelFormat(hDC, pixelFormat, &pixelFormatDesc);
+		SetPixelFormat(surface->hDC, pixelFormat, &pixelFormatDesc);
 
 		int contextAttrs[] = {
 			WGL_CONTEXT_MAJOR_VERSION_ARB, 4,
@@ -330,38 +279,18 @@ mg_surface mg_wgl_surface_create_for_window(mp_window window)
 			WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_CORE_PROFILE_BIT_ARB,
 			0};
 
-		HGLRC glContext = wglCreateContextAttribsARB(hDC, __mgWGLDummyContext.glContext, contextAttrs);
+		surface->glContext = wglCreateContextAttribsARB(surface->hDC, __mgWGLDummyContext.glContext, contextAttrs);
 
-		if(!glContext)
+		if(!surface->glContext)
 		{
 			//TODO error
 			int error = GetLastError();
 			printf("error: %i\n", error);
 		}
 
-		//NOTE: make gl context current
+		//NOTE: make gl context current and load api
-		wglMakeCurrent(hDC, glContext);
+		wglMakeCurrent(surface->hDC, surface->glContext);
 		wglSwapIntervalEXT(1);
-
-		//NOTE: fill surface data and load api
-		mg_wgl_surface* surface = malloc_type(mg_wgl_surface);
-
-		surface->interface.backend = MG_BACKEND_GL;
-		surface->interface.destroy = mg_wgl_surface_destroy;
-		surface->interface.prepare = mg_wgl_surface_prepare;
-		surface->interface.present = mg_wgl_surface_present;
-		surface->interface.swapInterval = mg_wgl_surface_swap_interval;
-		surface->interface.contentsScaling = mg_wgl_surface_contents_scaling;
-		surface->interface.getFrame = mg_wgl_surface_get_frame;
-		surface->interface.setFrame = mg_wgl_surface_set_frame;
-		surface->interface.getHidden = mg_wgl_surface_get_hidden;
-		surface->interface.setHidden = mg_wgl_surface_set_hidden;
-
-		surface->hWnd = childWindow;
-		surface->hDC = hDC;
-		surface->glContext = glContext;
-		surface->contentsScaling = contentsScaling;
-
 		mg_gl_load_gl43(&surface->api, mg_wgl_get_proc);
 
 		surfaceHandle = mg_surface_alloc_handle((mg_surface_data*)surface);

src/win32_app.c

@@ -777,6 +777,94 @@ mp_rect mp_window_get_content_rect(mp_window window)
 	return(rect);
 }
 
+///////////////////////////////////////////
+
+void mp_layer_init_for_window(mp_layer* layer, mp_window_data* window)
+{
+	//NOTE(martin): create a child window for the surface
+	WNDCLASS layerWindowClass = {.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC,
+		                         .lpfnWndProc = DefWindowProc,
+		                         .hInstance = GetModuleHandleW(NULL),
+		                         .lpszClassName = "layer_window_class",
+		                         .hCursor = LoadCursor(0, IDC_ARROW)};
+
+	RegisterClass(&layerWindowClass);
+
+	RECT parentRect;
+	GetClientRect(window->win32.hWnd, &parentRect);
+	int width = parentRect.right - parentRect.left;
+	int height = parentRect.bottom - parentRect.top;
+
+	layer->hWnd = CreateWindow("layer_window_class", "layer",
+	                            WS_CHILD | WS_VISIBLE,
+	                            0, 0, width, height,
+	                            window->win32.hWnd,
+	                            0,
+	                            layerWindowClass.hInstance,
+	                            0);
+}
+
+void mp_layer_cleanup(mp_layer* layer)
+{
+	DestroyWindow(layer->hWnd);
+}
+
+void* mp_layer_native_surface(mp_layer* layer)
+{
+	return((void*)layer->hWnd);
+}
+
+vec2 mp_layer_contents_scaling(mp_layer* layer)
+{
+	u32 dpi = GetDpiForWindow(layer->hWnd);
+	vec2 contentsScaling = (vec2){(float)dpi/96., (float)dpi/96.};
+	return(contentsScaling);
+}
+
+mp_rect mp_layer_get_frame(mp_layer* layer)
+{
+	RECT rect = {0};
+	GetClientRect(layer->hWnd, &rect);
+
+	vec2 scale = mp_layer_contents_scaling(layer);
+
+	mp_rect res = {rect.left/scale.x,
+	               rect.bottom/scale.y,
+	               (rect.right - rect.left)/scale.x,
+	               (rect.bottom - rect.top)/scale.y};
+	return(res);
+}
+
+void mp_layer_set_frame(mp_layer* layer, mp_rect frame)
+{
+	HWND parent = GetParent(layer->hWnd);
+	RECT parentContentRect;
+
+	GetClientRect(parent, &parentContentRect);
+	int parentHeight = 	parentContentRect.bottom - parentContentRect.top;
+
+	vec2 scale = mp_layer_contents_scaling(layer);
+
+	SetWindowPos(layer->hWnd,
+			     HWND_TOP,
+			     frame.x * scale.x,
+			     parentHeight - (frame.y + frame.h) * scale.y,
+			     frame.w * scale.x,
+			     frame.h * scale.y,
+			     SWP_NOACTIVATE | SWP_NOZORDER);
+}
+
+void mp_layer_set_hidden(mp_layer* layer, bool hidden)
+{
+	ShowWindow(layer->hWnd, hidden ? SW_HIDE : SW_NORMAL);
+}
+
+bool mp_layer_get_hidden(mp_layer* layer)
+{
+	bool hidden = !IsWindowVisible(layer->hWnd);
+	return(hidden);
+}
+
 /////////////////////////////////////////// WIP ///////////////////////////////////////////////
 //TODO: this is thrown here for a quick test. We should:
 //			- check for errors

src/win32_app.h

@@ -16,12 +16,17 @@
 #define UNICODE
 #include<windows.h>
 
+
 typedef struct win32_window_data
 {
 	HWND hWnd;
-
 } win32_window_data;
 
+typedef struct mp_layer
+{
+	HWND hWnd;
+} mp_layer;
+
 #define MP_PLATFORM_WINDOW_DATA win32_window_data win32;
 
 typedef struct win32_app_data

todo.txt

@@ -4,27 +4,24 @@ Overview
 [.] Make backend selection easier
 	[.] option macros to select backend-specific APIs to include when building an app
 		(ie, include gl_api.h when using gl backend)
-	[ ] error on bad option macro combinations
+	[/] error on bad option macro combinations
-	[ ] write doc about backend option macros
+	[/] write doc about backend option macros
 
-[>] Image API and backend
+[?] could have an internal, per-platform mp_layer struct that handles resizing/hiding etc...
-	[ ] Build image atlas on top
+	-> avoid duplication of frame/hiding and duplication of egl code.
-	[ ] Baked fonts?
+	[/] EGL surfaces: See how we can isolate platform-specific stuff and just deal with one egl impl...
-
-[x] Allow different versions of GL/GLES to co-exist
-[/] Allow selecting version of GL/GLES context when creating surface
-	- pass/set attributes when creating surface?
 
 [ ] Check that we can make GLES and GL surfaces co-exist in the app
 [ ] Allow controlling surface overlaying
 
-[/] could have an internal, per-platform mp_layer struct that handles resizing/hiding etc...
+[/] Allow selecting version of GL/GLES context when creating surface
-	-> avoid duplication of frame/hiding and duplication of egl code.
+	- pass/set attributes when creating surface?
-[/] EGL surfaces: See how we can isolate platform-specific stuff and just deal with one egl impl...
 [/] Automatic surface resizing
-[/] Keep dummy window/dummy context around for gl context creation, and don't reload wgl functions every time
 
 [!] Make linking with libEGL optional, even if EGL backend is compiled in milepost?
+	- use dead_strip_dylib on osx?
+	- use /DELAYLOAD:lib on windows?
+
 [!] Bundle examples with their own resources?? (e.g. avoiding clashes in metal libs files in bin directory)
 
 [!] Sort out gles contents scaling for high dpi on osx
@@ -33,10 +30,13 @@ Overview
 [!] Fix canvas perf issue on OSX
 
 
+[>] Image API and backend
+	[ ] Build image atlas on top
+	[ ] Baked fonts?
+
+
 [ ] Delegated drawing API+Impl
 
-
-
 [ ] Make building apps simpler
 	[ ] single include path
 	[ ] script for embedding dependencies / create app bundle