Atlas - SDL_bframebuffer.cc
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1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include "../../SDL_internal.h"
22
23#if SDL_VIDEO_DRIVER_HAIKU
24
25#include "SDL_bframebuffer.h"
26
27#include <AppKit.h>
28#include <InterfaceKit.h>
29#include "SDL_bmodes.h"
30#include "SDL_BWin.h"
31
32#include "../../main/haiku/SDL_BApp.h"
33
34#ifdef __cplusplus
35extern "C" {
36#endif
37
38#ifndef DRAWTHREAD
39static int32 HAIKU_UpdateOnce(SDL_Window *window);
40#endif
41
42static SDL_INLINE SDL_BWin *_ToBeWin(SDL_Window *window) {
43	return ((SDL_BWin*)(window->driverdata));
44}
45
46static SDL_INLINE SDL_BApp *_GetBeApp() {
47	return ((SDL_BApp*)be_app);
48}
49
50int HAIKU_CreateWindowFramebuffer(_THIS, SDL_Window * window,
51                                       Uint32 * format,
52                                       void ** pixels, int *pitch) {
53	SDL_BWin *bwin = _ToBeWin(window);
54	BScreen bscreen;
55	if(!bscreen.IsValid()) {
56		return -1;
57	}
58
59	while(!bwin->Connected()) { snooze(100); }
60	
61	/* Make sure we have exclusive access to frame buffer data */
62	bwin->LockBuffer();
63
64	/* format */
65	display_mode bmode;
66	bscreen.GetMode(&bmode);
67	int32 bpp = HAIKU_ColorSpaceToBitsPerPixel(bmode.space);
68	*format = HAIKU_BPPToSDLPxFormat(bpp);
69
70	/* Create the new bitmap object */
71	BBitmap *bitmap = bwin->GetBitmap();
72
73	if(bitmap) {
74		delete bitmap;
75	}
76	bitmap = new BBitmap(bwin->Bounds(), (color_space)bmode.space,
77			false,	/* Views not accepted */
78			true);	/* Contiguous memory required */
79			
80	if(bitmap->InitCheck() != B_OK) {
81		delete bitmap;
82		return SDL_SetError("Could not initialize back buffer!");
83	}
84
85
86	bwin->SetBitmap(bitmap);
87	
88	/* Set the pixel pointer */
89	*pixels = bitmap->Bits();
90
91	/* pitch = width of window, in bytes */
92	*pitch = bitmap->BytesPerRow();
93
94	bwin->SetBufferExists(true);
95	bwin->SetTrashBuffer(false);
96	bwin->UnlockBuffer();
97	return 0;
98}
99
100
101
102int HAIKU_UpdateWindowFramebuffer(_THIS, SDL_Window * window,
103                                      const SDL_Rect * rects, int numrects) {
104	if(!window)
105		return 0;
106
107	SDL_BWin *bwin = _ToBeWin(window);
108
109#ifdef DRAWTHREAD	
110	bwin->LockBuffer();
111	bwin->SetBufferDirty(true);
112	bwin->UnlockBuffer();
113#else
114	bwin->SetBufferDirty(true);
115	HAIKU_UpdateOnce(window);
116#endif
117
118	return 0;
119}
120
121int32 HAIKU_DrawThread(void *data) {
122	SDL_BWin *bwin = (SDL_BWin*)data;
123	
124	BScreen bscreen;
125	if(!bscreen.IsValid()) {
126		return -1;
127	}
128
129	while(bwin->ConnectionEnabled()) {
130		if( bwin->Connected() && bwin->BufferExists() && bwin->BufferIsDirty() ) {
131			bwin->LockBuffer();
132			BBitmap *bitmap = NULL;
133			bitmap = bwin->GetBitmap();
134			int32 windowPitch = bitmap->BytesPerRow();
135			int32 bufferPitch = bwin->GetRowBytes();
136			uint8 *windowpx;
137			uint8 *bufferpx;
138
139			int32 BPP = bwin->GetBytesPerPx();
140			int32 windowSub = bwin->GetFbX() * BPP +
141						  bwin->GetFbY() * windowPitch;
142			clipping_rect *clips = bwin->GetClips();
143			int32 numClips = bwin->GetNumClips();
144			int i, y;
145
146			/* Blit each clipping rectangle */
147			bscreen.WaitForRetrace();
148			for(i = 0; i < numClips; ++i) {
149				/* Get addresses of the start of each clipping rectangle */
150				int32 width = clips[i].right - clips[i].left + 1;
151				int32 height = clips[i].bottom - clips[i].top + 1;
152				bufferpx = bwin->GetBufferPx() + 
153					clips[i].top * bufferPitch + clips[i].left * BPP;
154				windowpx = (uint8*)bitmap->Bits() + 
155					clips[i].top * windowPitch + clips[i].left * BPP -
156					windowSub;
157
158				/* Copy each row of pixels from the window buffer into the frame
159				   buffer */
160				for(y = 0; y < height; ++y)
161				{
162
163					if(bwin->CanTrashWindowBuffer()) {
164						goto escape;	/* Break out before the buffer is killed */
165					}
166
167					memcpy(bufferpx, windowpx, width * BPP);
168					bufferpx += bufferPitch;
169					windowpx += windowPitch;
170				}
171			}
172
173			bwin->SetBufferDirty(false);
174escape:
175			bwin->UnlockBuffer();
176		} else {
177			snooze(16000);
178		}
179	}
180	
181	return B_OK;
182}
183
184void HAIKU_DestroyWindowFramebuffer(_THIS, SDL_Window * window) {
185	SDL_BWin *bwin = _ToBeWin(window);
186	
187	bwin->LockBuffer();
188	
189	/* Free and clear the window buffer */
190	BBitmap *bitmap = bwin->GetBitmap();
191	delete bitmap;
192	bwin->SetBitmap(NULL);
193	bwin->SetBufferExists(false);
194	bwin->UnlockBuffer();
195}
196
197
198/*
199 * TODO:
200 * This was written to test if certain errors were caused by threading issues.
201 * The specific issues have since become rare enough that they may have been
202 * solved, but I doubt it- they were pretty sporadic before now.
203 */
204#ifndef DRAWTHREAD
205static int32 HAIKU_UpdateOnce(SDL_Window *window) {
206	SDL_BWin *bwin = _ToBeWin(window);
207	BScreen bscreen;
208	if(!bscreen.IsValid()) {
209		return -1;
210	}
211
212	if(bwin->ConnectionEnabled() && bwin->Connected()) {
213		bwin->LockBuffer();
214		int32 windowPitch = window->surface->pitch;
215		int32 bufferPitch = bwin->GetRowBytes();
216		uint8 *windowpx;
217		uint8 *bufferpx;
218
219		int32 BPP = bwin->GetBytesPerPx();
220		uint8 *windowBaseAddress = (uint8*)window->surface->pixels;
221		int32 windowSub = bwin->GetFbX() * BPP +
222						  bwin->GetFbY() * windowPitch;
223		clipping_rect *clips = bwin->GetClips();
224		int32 numClips = bwin->GetNumClips();
225		int i, y;
226
227		/* Blit each clipping rectangle */
228		bscreen.WaitForRetrace();
229		for(i = 0; i < numClips; ++i) {
230			/* Get addresses of the start of each clipping rectangle */
231			int32 width = clips[i].right - clips[i].left + 1;
232			int32 height = clips[i].bottom - clips[i].top + 1;
233			bufferpx = bwin->GetBufferPx() + 
234				clips[i].top * bufferPitch + clips[i].left * BPP;
235			windowpx = windowBaseAddress + 
236				clips[i].top * windowPitch + clips[i].left * BPP - windowSub;
237
238			/* Copy each row of pixels from the window buffer into the frame
239			   buffer */
240			for(y = 0; y < height; ++y)
241			{
242				memcpy(bufferpx, windowpx, width * BPP);
243				bufferpx += bufferPitch;
244				windowpx += windowPitch;
245			}
246		}
247		bwin->UnlockBuffer();
248	}
249	return 0;
250}
251#endif
252
253#ifdef __cplusplus
254}
255#endif
256
257#endif /* SDL_VIDEO_DRIVER_HAIKU */
258
259/* vi: set ts=4 sw=4 expandtab: */
260
[FILE END]
(C) 2025 0x4248
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