gbdk-2020 | GameBoy Development Kit |
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43 <div id="projectname">GBDK 2020 Docs
44  <span id="projectnumber">4.5.0</span>
45 </div>
46 <div id="projectbrief">API Documentation for GBDK 2020</div>
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101 <div><div class="header">
102 <div class="headertitle"><div class="title">Migrating to new GBDK Versions </div></div>
103 </div><!--header-->
104 <div class="contents">
105 <div class="textblock"><p >This section contains information that may be useful to know or important when upgrading to a newer GBDK release.</p>
106 <h1><a class="anchor" id="autotoc_md224"></a>
107 GBDK-2020 versions</h1>
108 <h2><a class="anchor" id="autotoc_md225"></a>
109 Porting to GBDK-2020 4.5.0</h2>
110 <ul>
111 <li>GBDK now requires ~SDCC 4.5.0 or higher with GBDK-2020 patches for the z80, sm83 and NES</li>
112 <li>Build Host:<ul>
113 <li>Changed from building on MacOS 13 to MacOS 15 for 64 bit Intel</li>
114 <li>Changed from building on Windows 2019 to 2022 for Intel</li>
115 </ul>
116 </li>
117 <li>SMS/GG<ul>
118 <li>Changed parameter order of <a class="el" href="gb_8h.html#set_tile_submap">set_tile_submap()</a>, <a class="el" href="msx_8h.html#set_tile_submap_compat">set_tile_submap_compat()</a></li>
119 <li>Remove broken and unused <code>FAST_DIV8</code> macro</li>
120 <li>Removed legacy <code>___sdcc_bcall trampoline</code></li>
121 </ul>
122 </li>
123 <li>MegaDuck<ul>
124 <li>Renamed <code>DUCK_IO_CMD_PRINT_INIT_MAYBE_EXT_IO</code> to <a class="el" href="laptop__io_8h.html#DUCK_IO_CMD_PRINT_INIT_EXT_IO">DUCK_IO_CMD_PRINT_INIT_EXT_IO</a></li>
125 <li>Removed<code>duck_io_printer_detected()</code>, <code>duck_io_printer_type()</code> and replaced them with <a class="el" href="laptop__io_8h.html#duck_io_printer_query">duck_io_printer_query()</a>, <a class="el" href="laptop__io_8h.html#duck_io_printer_last_status">duck_io_printer_last_status()</a></li>
126 </ul>
127 </li>
128 <li>png2asset<ul>
129 <li>Fixed missing error for <code>-bin</code> requiring <code>-map</code></li>
130 </ul>
131 </li>
132 </ul>
133 <h2><a class="anchor" id="autotoc_md226"></a>
134 Porting to GBDK-2020 4.4.0</h2>
135 <ul>
136 <li>GBDK now requires ~SDCC 4.5.0 or higher with GBDK-2020 patches for the z80 and NES</li>
137 <li>Build Host:<ul>
138 <li>Changed from building on MacOS 11 to MacOS 13 for 64 bit Intel</li>
139 <li>Changed from building on Ubuntu Linux 20.04 to 22.04 for 64 bit Intel</li>
140 </ul>
141 </li>
142 <li>NES<ul>
143 <li>LCD bkg_scroll_y is now relative to the current scanline<ul>
144 <li>This change creates higher compatibility with the Game Boy SCY_REG and makes it easier to re-use Game Boy LCD handlers</li>
145 <li>This behaves differently to 4.3.0 and affects LCD handlers that change the y scrolling coordinate mid-frame</li>
146 </ul>
147 </li>
148 <li>Added <a class="el" href="docs_toolchain.html#utility_makenes">makenes</a> utility for finalizing NES rom headers (called automatically by <a class="el" href="docs_toolchain.html#lcc">lcc</a>)</li>
149 </ul>
150 </li>
151 <li>SMS/GG<ul>
152 <li>Changed from unsigned (<code>uint16_t</code>) to signed int16 (<code>int16_t</code>) for coordinates with the family of <code>...metasprite...()</code> functions</li>
153 <li>Changed screen map to be at <code>0x1800</code> instead of <code>0x3800</code><ul>
154 <li>To switch to the older configuration use <code><a class="el" href="sms_8h.html#__WRITE_VDP_REG_UNSAFE">__WRITE_VDP_REG_UNSAFE(VDP_R2, R2_MAP_0x3800)</a>;</code> and <code><a class="el" href="sms_8h.html#__WRITE_VDP_REG_UNSAFE">__WRITE_VDP_REG_UNSAFE(VDP_R5, R5_SAT_0x3F00)</a>;</code> near the start of main</li>
155 </ul>
156 </li>
157 </ul>
158 </li>
159 <li>SDCC<ul>
160 <li>Changed to using the <code>-N</code> flag with sdas since the the <code>-n</code> flag was removed</li>
161 </ul>
162 </li>
163 <li>Changed <a class="el" href="docs_toolchain.html#lcc">lcc</a> to use <code>--no-optsdcc-in-asm</code> for building user programs and the GBDK library<ul>
164 <li>This removes some "O line" meta-data from object files to avoid false-positive linker errors</li>
165 <li>It is a workaround for SDCC now appending the calling convention to the "O Line" in the object files by default</li>
166 </ul>
167 </li>
168 </ul>
169 <h2><a class="anchor" id="autotoc_md227"></a>
170 Porting to GBDK-2020 4.3.0</h2>
171 <ul>
172 <li>GBDK now requires ~SDCC 4.4.0 or higher with GBDK-2020 patches for the z80 and NES</li>
173 <li>Changed to new calling convention for <a class="el" href="stdio_8h.html#printf">printf()</a>, <a class="el" href="stdio_8h.html#sprintf">sprintf()</a>, <a class="el" href="stdlib_8h.html#abs">abs()</a></li>
174 <li>Changed to new SDCC calling convention for <a class="el" href="msx_8h.html#set_bkg_tile_xy">set_bkg_tile_xy()</a>, <a class="el" href="msx_8h.html#set_win_tile_xy">set_win_tile_xy()</a></li>
175 <li>The SDCC object file format (<code>.o</code>, <code>.rel</code> files) changed from <code>XL3</code> (24 bit addresses) to <code>XL4</code> (32 bit addresses)<ul>
176 <li>Bankpack now supports both</li>
177 </ul>
178 </li>
179 <li>Recommend using:<ul>
180 <li><a class="el" href="sms_8h.html#CURRENT_BANK">CURRENT_BANK</a> instead of <code>_current_bank</code></li>
181 <li><a class="el" href="asm_2types_8h.html#BANKED">BANKED</a> macro instead of <code>__banked</code></li>
182 </ul>
183 </li>
184 <li>NES <a class="el" href="msx_8h.html#set_sprite_palette">set_sprite_palette()</a> now indexes from <code>0..3</code> instead of <code>4..7</code></li>
185 <li>png2asset:<ul>
186 <li>If using either <code>-bpp 1</code> or <code>-pack_mode 1bpp</code> then the other is auto-enabled</li>
187 <li>Significant bug fixes and changes, check to make sure output is as expected</li>
188 </ul>
189 </li>
190 </ul>
191 <h2><a class="anchor" id="autotoc_md228"></a>
192 Porting to GBDK-2020 4.2.0</h2>
193 <ul>
194 <li>GBDK now requires ~SDCC 4.3 or higher with GBDK-2020 patches for the z80 and NES</li>
195 <li>The following new functions replace old ones:<ul>
196 <li>While the old functions will continue to work for now, migration to new versions is strongly encouraged</li>
197 <li><a class="el" href="gb_8h.html#vsync">vsync()</a>: replaces <a class="el" href="gb_8h.html#wait_vbl_done">wait_vbl_done()</a></li>
198 <li><a class="el" href="cgb_8h.html#set_default_palette">set_default_palette()</a>: replaces <a class="el" href="cgb_8h.html#cgb_compatibility">cgb_compatibility()</a></li>
199 <li><a class="el" href="gb_2metasprites_8h.html#move_metasprite_flipy">move_metasprite_flipy()</a>: replaces <a class="el" href="gb_2metasprites_8h.html#move_metasprite_hflip">move_metasprite_hflip()</a></li>
200 <li><a class="el" href="gb_2metasprites_8h.html#move_metasprite_flipx">move_metasprite_flipx()</a>: replaces <a class="el" href="gb_2metasprites_8h.html#move_metasprite_vflip">move_metasprite_vflip()</a></li>
201 <li><a class="el" href="gb_2metasprites_8h.html#move_metasprite_flipxy">move_metasprite_flipxy()</a>: replaces <a class="el" href="gb_2metasprites_8h.html#move_metasprite_hvflip">move_metasprite_hvflip()</a></li>
202 <li><a class="el" href="gb_2metasprites_8h.html#move_metasprite_ex">move_metasprite_ex()</a>: replaces <a class="el" href="gb_2metasprites_8h.html#move_metasprite">move_metasprite()</a></li>
203 </ul>
204 </li>
205 <li>The unused <code>-DINT_16_BITS</code> argument was removed from the default SDCC compiler and preprocessor arguments (used in pre-GBDK2020 <code>gbdk/include-gb/types.h</code>)</li>
206 <li>Removed legacy MBC register definitions <code>.MBC1_ROM_PAGE</code> and <code>.MBC_ROM_PAGE</code></li>
207 <li>SMS/GG<ul>
208 <li>Swapped A and B buttons to match game boy buttons</li>
209 </ul>
210 </li>
211 </ul>
212 <h2><a class="anchor" id="autotoc_md229"></a>
213 Porting to GBDK-2020 4.1.1</h2>
214 <ul>
215 <li>No significant changes required</li>
216 </ul>
217 <h2><a class="anchor" id="autotoc_md230"></a>
218 Porting to GBDK-2020 4.1.0</h2>
219 <ul>
220 <li>GBDK now requires SDCC 4.2 or higher with GBDK-2020 patches for the z80 linker</li>
221 <li>The default calling convention changed in SDCC 4.2, see <a class="el" href="docs_coding_guidelines.html#sdcc_calling_convention">Calling Conventions</a> for more details.<ul>
222 <li>If you are linking to libraries compiled with an older version of SDCC / GBDK then you may have to recompile them.</li>
223 <li>If there are existing functions written in ASM which <b>receive parameters</b> they should also be reviewed to make sure they work with the new <code>__sdcccall(1)</code> calling convention, or have their header declaration changed to use <code>OLDCALL</code>.</li>
224 <li>If there are existing functions written in ASM which <b>call other functions written in C</b> the callee C function should be declared OLDCALL.</li>
225 <li>Function pointer declarations should be checked to see if they need OLDCALL added to the declaration.<ul>
226 <li>Example (add OLDCALL at the end)</li>
227 <li>FROM: <code>typedef void (*someFunc)(uint8_t, uint8_t);</code></li>
228 <li>TO: <code>typedef void (*someFunc)(uint8_t, uint8_t) OLDCALL;</code></li>
229 </ul>
230 </li>
231 <li>If you are using tools such as <code>rgb2sdas</code> (from hUGETracker/Driver) you may need to edit the resulting .o file and replace <code>-mgbz80</code> with <code>-msm83</code> in addition to using <code>OLDCALL</code></li>
232 </ul>
233 </li>
234 <li>The SDCC <code>PORT</code> name for the Game Boy and related clones changed from <code>gbz80</code> to <code>sm83</code>.<ul>
235 <li>Additional details in the <a class="el" href="docs_supported_consoles.html#console_port_plat_settings">Console Port and Platform Settings</a> section and <a class="el" href="docs_faq.html#faq_gbz80_sm83_old_port_name_error">FAQ entry</a>. <a class="el" href="docs_toolchain.html#lcc">lcc</a> will error out if the old <code>PORT</code> name is passed in.</li>
236 </ul>
237 </li>
238 <li>The library base path changed from <code>lib/small/asxxxx/</code> to <code>lib/</code>.<ul>
239 <li>For example <code>lib/small/asxxxx/gb</code> becomes <code>lib/gb</code></li>
240 </ul>
241 </li>
242 <li>Allocations for ISR chain lengths were fixed.<ul>
243 <li>Now they are VBL: 4 user handlers, LCD: 3 user handlers, SIO/TIM/JOY: 4 user handlers</li>
244 </ul>
245 </li>
246 </ul>
247 <h2><a class="anchor" id="autotoc_md231"></a>
248 Porting to GBDK-2020 4.0.6</h2>
249 <ul>
250 <li>Renamed <code>bgb_emu.h</code> to <code>emu_debug.h</code> and BGB_* functions to EMU_*<ul>
251 <li>Aliases for the BGB_* ones and a <code>bgb_emu.h</code> shim are present for backward compatibility, but updating to the new naming is recommended</li>
252 </ul>
253 </li>
254 </ul>
255 <h2><a class="anchor" id="autotoc_md232"></a>
256 Porting to GBDK-2020 4.0.5</h2>
257 <ul>
258 <li>GBDK now requires SDCC 12259 or higher with GBDK-2020 patches</li>
259 <li>Variables in static storage are now initialized to zero per C standard (but remaining WRAM is not cleared)</li>
260 <li><a class="el" href="docs_toolchain.html#utility_png2asset">png2asset</a> is the new name for the <code>png2mtspr</code> utility</li>
261 <li><a class="el" href="docs_toolchain.html#lcc">lcc</a> : Changed default output format when not specified from <code>.ihx</code> to <code>.gb</code> (or other active rom extension)</li>
262 <li>The <code>_BSS</code> area is deprecated (use <code>_DATA</code> instead)</li>
263 <li>The <code>_BASE</code> area is renamed to <code>_HOME</code></li>
264 <li>Variables in static storage are now initialized to zero per C standard (but remaining WRAM is not cleared)</li>
265 <li><a class="el" href="stdlib_8h.html#itoa">itoa()</a>, <a class="el" href="stdlib_8h.html#uitoa">uitoa()</a>, <a class="el" href="stdlib_8h.html#ltoa">ltoa()</a>, <a class="el" href="stdlib_8h.html#ultoa">ultoa()</a> all now require a radix value (base) argument to be passed. On the Game Boy and Analogue Pocket the parameter is required but not utilized.</li>
266 <li>set_bkg_1bit_data has been renamed to <a class="el" href="sms_8h.html#set_bkg_1bpp_data">set_bkg_1bpp_data</a></li>
267 <li>The following header files which are now cross platform were moved from <code>gb/</code> to <code>gbdk/</code>: <code>bcd.h</code>, <code>console.h</code>, <code>far_ptr.h</code>, <code>font.h</code>, <code>gbdecompress.h</code>, <code>gbdk-lib.h</code>, <code>incbin.h</code>, <code>metasprites.h</code>, <code>platform.h</code>, <code>version.h</code><ul>
268 <li>When including them use <code>#include <gbdk/...></code> instead of <code>#include <gb/></code></li>
269 </ul>
270 </li>
271 </ul>
272 <h2><a class="anchor" id="autotoc_md233"></a>
273 Porting to GBDK-2020 4.0.4</h2>
274 <ul>
275 <li>GBDK now requires SDCC 12238 or higher</li>
276 <li>Made sample.h, cgb.h and sgb.h independent from gb.h</li>
277 </ul>
278 <h2><a class="anchor" id="autotoc_md234"></a>
279 Porting to GBDK-2020 4.0.3</h2>
280 <ul>
281 <li>No significant changes required</li>
282 </ul>
283 <h2><a class="anchor" id="autotoc_md235"></a>
284 Porting to GBDK-2020 4.0.2</h2>
285 <ul>
286 <li>The default font has been reduced from 256 to 96 characters.<ul>
287 <li>Code using special characters may need to be updated.</li>
288 <li>The off-by-1 character index offset was removed for fonts. Old fonts with the offset need to be re-adjusted.</li>
289 </ul>
290 </li>
291 </ul>
292 <h2><a class="anchor" id="autotoc_md236"></a>
293 Porting to GBDK-2020 4.0.1</h2>
294 <ul>
295 <li><b>Important!</b> : The <code>WRAM</code> memory region is no longer automatically initialized to zeros during startup.<ul>
296 <li>Any variables which are declared without being initialized may have <b>indeterminate values instead of 0</b> on startup. This might reveal previously hidden bugs in your code.</li>
297 <li>Check your code for variables that are not initialized before use.</li>
298 <li>In BGB you can turn on triggering exceptions (options panel) reading from unitialized RAM. This allows for some additional runtime detection of uninitialized vars.</li>
299 </ul>
300 </li>
301 <li>In .ihx files, multiple writes to the same ROM address are now warned about using <a class="el" href="docs_toolchain.html#ihxcheck">ihxcheck</a>.</li>
302 <li><code>set_*_tiles()</code> now wrap maps around horizontal and vertical boundaries correctly. Code relying on it not wrapping correctly may be affected.</li>
303 </ul>
304 <h2><a class="anchor" id="autotoc_md237"></a>
305 Porting to GBDK-2020 4.0</h2>
306 <ul>
307 <li>GBDK now requires SDCC 4.0.3 or higher</li>
308 <li>The old linker <code>link-gbz80</code> has been REMOVED, the linker <a class="el" href="docs_toolchain.html#sdldgb">sdldgb</a> from SDCC is used.<ul>
309 <li>Due to the linker change, there are no longer warnings about multiple writes to the same ROM address.</li>
310 </ul>
311 </li>
312 <li>GBDK now generates .ihx files, those are converted to a ROM using <a class="el" href="docs_toolchain.html#makebin">makebin</a> (lcc can do this automatically in some use cases)</li>
313 <li>Setting ROM bytes directly with <code>-Wl-yp0x<address>=0x<value></code> is no longer supported. Instead use <a class="el" href="docs_toolchain.html#makebin">makebin</a> flags. For example, use <code>-Wm-yC</code> instead of <code>-Wl-yp0x143=0xC0</code>. See <a class="el" href="docs_faq.html#faq_gb_type_header_setting">faq_gb_type_header_setting</a>.</li>
314 <li>OAM symbol has been renamed to <code>_shadow_OAM</code>, that allows accessing shadow OAM directly from C code</li>
315 </ul>
316 <h2><a class="anchor" id="autotoc_md238"></a>
317 Porting to GBDK-2020 3.2</h2>
318 <ul>
319 <li>No significant changes required</li>
320 </ul>
321 <h2><a class="anchor" id="autotoc_md239"></a>
322 Porting to GBDK-2020 3.1.1</h2>
323 <ul>
324 <li>No significant changes required</li>
325 </ul>
326 <h2><a class="anchor" id="autotoc_md240"></a>
327 Porting to GBDK-2020 3.1</h2>
328 <ul>
329 <li>Behavior formerly enabled by USE_SFR_FOR_REG is on by default now (no need to specify it, it isn't a tested <code>#ifdef</code> anymore). check here why: <a href="https://gbdev.gg8.se/forums/viewtopic.php?id=697">https://gbdev.gg8.se/forums/viewtopic.php?id=697</a></li>
330 </ul>
331 <h2><a class="anchor" id="autotoc_md241"></a>
332 Porting to GBDK-2020 3.0.1</h2>
333 <ul>
334 <li>LCC was upgraded to use SDCC v4.0. Makefile changes may be required<ul>
335 <li>The symbol format changed. To get bgb compatible symbols turn on <code>.noi</code> output (LCC argument: <code>-Wl-j</code> or <code>-debug</code>) and use <code>-Wm-yS</code></li>
336 <li>?? Suggested: With LCC argument: <code>-Wa-l</code> (sdasgb:<code>-a All user symbols made global</code>)</li>
337 <li>In SDCC 3.6.0, the default for char changed from signed to unsigned.<ul>
338 <li>If you want the old behavior use <code>--fsigned-char</code>.</li>
339 <li>lcc includes <code>--fsigned-char</code> by default</li>
340 <li>Explicit declaration of unsigned vars is encouraged (for example, '15U' instead of '15')</li>
341 </ul>
342 </li>
343 <li><code>.init</code> address has been removed</li>
344 </ul>
345 </li>
346 </ul>
347 <hr />
348 <h1><a class="anchor" id="autotoc_md243"></a>
349 Historical GBDK versions</h1>
350 <h2><a class="anchor" id="autotoc_md244"></a>
351 GBDK 1.1 to GBDK 2.0</h2>
352 <ul>
353 <li>Change your int variables to long if they have to be bigger than 255. If they should only contain values between 0 and 255, use an unsigned int.</li>
354 <li>If your application uses the delay function, you'll have to adapt your delay values.</li>
355 <li>Several functions have new names. In particular some of them have been changed to macros (e.g. show_bkg() is now SHOW_BKG).</li>
356 <li>You will probably have to change the name of the header files that you include. </li>
357 </ul>
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