src/gba/renderers/software-private.h (view raw)
1/* Copyright (c) 2013-2015 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#ifndef SOFTWARE_PRIVATE_H
7#define SOFTWARE_PRIVATE_H
8
9#include <mgba/internal/arm/macros.h>
10#include <mgba/internal/gba/renderers/video-software.h>
11
12#ifdef NDEBUG
13#define VIDEO_CHECKS false
14#else
15#define VIDEO_CHECKS true
16#endif
17
18void GBAVideoSoftwareRendererDrawBackgroundMode0(struct GBAVideoSoftwareRenderer* renderer,
19 struct GBAVideoSoftwareBackground* background, int y);
20void GBAVideoSoftwareRendererDrawBackgroundMode2(struct GBAVideoSoftwareRenderer* renderer,
21 struct GBAVideoSoftwareBackground* background, int y);
22void GBAVideoSoftwareRendererDrawBackgroundMode3(struct GBAVideoSoftwareRenderer* renderer,
23 struct GBAVideoSoftwareBackground* background, int y);
24void GBAVideoSoftwareRendererDrawBackgroundMode4(struct GBAVideoSoftwareRenderer* renderer,
25 struct GBAVideoSoftwareBackground* background, int y);
26void GBAVideoSoftwareRendererDrawBackgroundMode5(struct GBAVideoSoftwareRenderer* renderer,
27 struct GBAVideoSoftwareBackground* background, int y);
28
29int GBAVideoSoftwareRendererPreprocessSprite(struct GBAVideoSoftwareRenderer* renderer, struct GBAObj* sprite, int index, int y);
30void GBAVideoSoftwareRendererPostprocessSprite(struct GBAVideoSoftwareRenderer* renderer, unsigned priority);
31
32static inline unsigned _brighten(unsigned color, int y);
33static inline unsigned _darken(unsigned color, int y);
34static unsigned _mix(int weightA, unsigned colorA, int weightB, unsigned colorB);
35
36
37// We stash the priority on the top bits so we can do a one-operator comparison
38// The lower the number, the higher the priority, and sprites take precedence over backgrounds
39// We want to do special processing if the color pixel is target 1, however
40
41static inline void _compositeBlendObjwin(struct GBAVideoSoftwareRenderer* renderer, uint32_t* pixel, uint32_t color, uint32_t current) {
42 if (color >= current) {
43 if (current & FLAG_TARGET_1 && color & FLAG_TARGET_2) {
44 color = _mix(renderer->blda, current, renderer->bldb, color);
45 } else {
46 color = (current & 0x00FFFFFF) | (current & (FLAG_REBLEND | FLAG_OBJWIN));
47 }
48 } else {
49 color = (color & ~FLAG_TARGET_2) | (current & FLAG_OBJWIN);
50 }
51 *pixel = color;
52}
53
54static inline void _compositeBlendNoObjwin(struct GBAVideoSoftwareRenderer* renderer, uint32_t* pixel, uint32_t color, uint32_t current) {
55 if (!IS_WRITABLE(current)) { \
56 return; \
57 } \
58 if (color >= current) {
59 if (current & FLAG_TARGET_1 && color & FLAG_TARGET_2) {
60 color = _mix(renderer->blda, current, renderer->bldb, color);
61 } else {
62 color = (current & 0x00FFFFFF) | (current & (FLAG_REBLEND | FLAG_OBJWIN));
63 }
64 } else {
65 color = color & ~FLAG_TARGET_2;
66 }
67 *pixel = color;
68}
69
70static inline void _compositeNoBlendObjwin(struct GBAVideoSoftwareRenderer* renderer, uint32_t* pixel, uint32_t color,
71 uint32_t current) {
72 UNUSED(renderer);
73 if (color < current) {
74 color |= (current & FLAG_OBJWIN);
75 } else {
76 color = (current & 0x00FFFFFF) | (current & (FLAG_REBLEND | FLAG_OBJWIN));
77 }
78 *pixel = color;
79}
80
81static inline void _compositeNoBlendNoObjwin(struct GBAVideoSoftwareRenderer* renderer, uint32_t* pixel, uint32_t color,
82 uint32_t current) {
83 UNUSED(renderer);
84 if (color >= current) {
85 color = (current & 0x00FFFFFF) | (current & (FLAG_REBLEND | FLAG_OBJWIN));
86 }
87 *pixel = color;
88}
89
90#define COMPOSITE_16_OBJWIN(BLEND, IDX) \
91 if (!IS_WRITABLE(current)) { \
92 continue; \
93 } \
94 if (objwinForceEnable || (!(current & FLAG_OBJWIN)) == objwinOnly) { \
95 unsigned color = (current & FLAG_OBJWIN) ? objwinPalette[paletteData | pixelData] : palette[pixelData]; \
96 unsigned mergedFlags = flags; \
97 if (current & FLAG_OBJWIN) { \
98 mergedFlags = objwinFlags; \
99 } \
100 _composite ## BLEND ## Objwin(renderer, &pixel[IDX], color | mergedFlags, current); \
101 }
102
103#define COMPOSITE_16_NO_OBJWIN(BLEND, IDX) \
104 _composite ## BLEND ## NoObjwin(renderer, &pixel[IDX], palette[pixelData] | flags, current);
105
106#define COMPOSITE_256_OBJWIN(BLEND, IDX) \
107 if (!IS_WRITABLE(current)) { \
108 continue; \
109 } \
110 if (objwinForceEnable || (!(current & FLAG_OBJWIN)) == objwinOnly) { \
111 unsigned color = (current & FLAG_OBJWIN) ? objwinPalette[pixelData] : palette[pixelData]; \
112 unsigned mergedFlags = flags; \
113 if (current & FLAG_OBJWIN) { \
114 mergedFlags = objwinFlags; \
115 } \
116 _composite ## BLEND ## Objwin(renderer, &pixel[IDX], color | mergedFlags, current); \
117 }
118
119#define COMPOSITE_256_NO_OBJWIN COMPOSITE_16_NO_OBJWIN
120
121#define BACKGROUND_DRAW_PIXEL_16(BLEND, OBJWIN, IDX) \
122 pixelData = tileData & 0xF; \
123 current = pixel[IDX]; \
124 if (pixelData && IS_WRITABLE(current)) { \
125 COMPOSITE_16_ ## OBJWIN (BLEND, IDX); \
126 } \
127 tileData >>= 4;
128
129#define BACKGROUND_DRAW_PIXEL_256(BLEND, OBJWIN, IDX) \
130 pixelData = tileData & 0xFF; \
131 current = pixel[IDX]; \
132 if (pixelData && IS_WRITABLE(current)) { \
133 COMPOSITE_256_ ## OBJWIN (BLEND, IDX); \
134 } \
135 tileData >>= 8;
136
137// TODO: Remove UNUSEDs after implementing OBJWIN for modes 3 - 5
138#define PREPARE_OBJWIN \
139 int objwinSlowPath = GBARegisterDISPCNTIsObjwinEnable(renderer->dispcnt); \
140 int objwinOnly = 0; \
141 int objwinForceEnable = 0; \
142 UNUSED(objwinForceEnable); \
143 color_t* objwinPalette = renderer->normalPalette; \
144 if (renderer->d.highlightAmount && background->highlight) { \
145 objwinPalette = renderer->highlightPalette; \
146 } \
147 UNUSED(objwinPalette); \
148 if (objwinSlowPath) { \
149 if (background->target1 && GBAWindowControlIsBlendEnable(renderer->objwin.packed) && \
150 (renderer->blendEffect == BLEND_BRIGHTEN || renderer->blendEffect == BLEND_DARKEN)) { \
151 objwinPalette = renderer->variantPalette; \
152 if (renderer->d.highlightAmount && background->highlight) { \
153 palette = renderer->highlightVariantPalette; \
154 } \
155 } \
156 switch (background->index) { \
157 case 0: \
158 objwinForceEnable = GBAWindowControlIsBg0Enable(renderer->objwin.packed) && \
159 GBAWindowControlIsBg0Enable(renderer->currentWindow.packed); \
160 objwinOnly = !GBAWindowControlIsBg0Enable(renderer->objwin.packed); \
161 break; \
162 case 1: \
163 objwinForceEnable = GBAWindowControlIsBg1Enable(renderer->objwin.packed) && \
164 GBAWindowControlIsBg1Enable(renderer->currentWindow.packed); \
165 objwinOnly = !GBAWindowControlIsBg1Enable(renderer->objwin.packed); \
166 break; \
167 case 2: \
168 objwinForceEnable = GBAWindowControlIsBg2Enable(renderer->objwin.packed) && \
169 GBAWindowControlIsBg2Enable(renderer->currentWindow.packed); \
170 objwinOnly = !GBAWindowControlIsBg2Enable(renderer->objwin.packed); \
171 break; \
172 case 3: \
173 objwinForceEnable = GBAWindowControlIsBg3Enable(renderer->objwin.packed) && \
174 GBAWindowControlIsBg3Enable(renderer->currentWindow.packed); \
175 objwinOnly = !GBAWindowControlIsBg3Enable(renderer->objwin.packed); \
176 break; \
177 } \
178 }
179
180static inline unsigned _brighten(unsigned color, int y) {
181 unsigned c = 0;
182 unsigned a;
183#ifdef COLOR_16_BIT
184 a = color & 0x1F;
185 c |= (a + ((0x1F - a) * y) / 16) & 0x1F;
186
187#ifdef COLOR_5_6_5
188 a = color & 0x7C0;
189 c |= (a + ((0x7C0 - a) * y) / 16) & 0x7C0;
190
191 a = color & 0xF800;
192 c |= (a + ((0xF800 - a) * y) / 16) & 0xF800;
193#else
194 a = color & 0x3E0;
195 c |= (a + ((0x3E0 - a) * y) / 16) & 0x3E0;
196
197 a = color & 0x7C00;
198 c |= (a + ((0x7C00 - a) * y) / 16) & 0x7C00;
199#endif
200#else
201 a = color & 0xFF;
202 c |= (a + ((0xFF - a) * y) / 16) & 0xFF;
203
204 a = color & 0xFF00;
205 c |= (a + ((0xFF00 - a) * y) / 16) & 0xFF00;
206
207 a = color & 0xFF0000;
208 c |= (a + ((0xFF0000 - a) * y) / 16) & 0xFF0000;
209#endif
210 return c;
211}
212
213static inline unsigned _darken(unsigned color, int y) {
214 unsigned c = 0;
215 unsigned a;
216#ifdef COLOR_16_BIT
217 a = color & 0x1F;
218 c |= (a - (a * y) / 16) & 0x1F;
219
220#ifdef COLOR_5_6_5
221 a = color & 0x7C0;
222 c |= (a - (a * y) / 16) & 0x7C0;
223
224 a = color & 0xF800;
225 c |= (a - (a * y) / 16) & 0xF800;
226#else
227 a = color & 0x3E0;
228 c |= (a - (a * y) / 16) & 0x3E0;
229
230 a = color & 0x7C00;
231 c |= (a - (a * y) / 16) & 0x7C00;
232#endif
233#else
234 a = color & 0xFF;
235 c |= (a - (a * y) / 16) & 0xFF;
236
237 a = color & 0xFF00;
238 c |= (a - (a * y) / 16) & 0xFF00;
239
240 a = color & 0xFF0000;
241 c |= (a - (a * y) / 16) & 0xFF0000;
242#endif
243 return c;
244}
245
246static unsigned _mix(int weightA, unsigned colorA, int weightB, unsigned colorB) {
247 unsigned c = 0;
248 unsigned a, b;
249#ifdef COLOR_16_BIT
250#ifdef COLOR_5_6_5
251 a = colorA & 0xF81F;
252 b = colorB & 0xF81F;
253 a |= (colorA & 0x7C0) << 16;
254 b |= (colorB & 0x7C0) << 16;
255 c = ((a * weightA + b * weightB) / 16);
256 if (c & 0x08000000) {
257 c = (c & ~0x0FC00000) | 0x07C00000;
258 }
259 if (c & 0x0020) {
260 c = (c & ~0x003F) | 0x001F;
261 }
262 if (c & 0x10000) {
263 c = (c & ~0x1F800) | 0xF800;
264 }
265 c = (c & 0xF81F) | ((c >> 16) & 0x07C0);
266#else
267 a = colorA & 0x7C1F;
268 b = colorB & 0x7C1F;
269 a |= (colorA & 0x3E0) << 16;
270 b |= (colorB & 0x3E0) << 16;
271 c = ((a * weightA + b * weightB) / 16);
272 if (c & 0x04000000) {
273 c = (c & ~0x07E00000) | 0x03E00000;
274 }
275 if (c & 0x0020) {
276 c = (c & ~0x003F) | 0x001F;
277 }
278 if (c & 0x8000) {
279 c = (c & ~0xF800) | 0x7C00;
280 }
281 c = (c & 0x7C1F) | ((c >> 16) & 0x03E0);
282#endif
283#else
284 a = colorA & 0xFF;
285 b = colorB & 0xFF;
286 c |= ((a * weightA + b * weightB) / 16) & 0x1FF;
287 if (c & 0x00000100) {
288 c = 0x000000FF;
289 }
290
291 a = colorA & 0xFF00;
292 b = colorB & 0xFF00;
293 c |= ((a * weightA + b * weightB) / 16) & 0x1FF00;
294 if (c & 0x00010000) {
295 c = (c & 0x000000FF) | 0x0000FF00;
296 }
297
298 a = colorA & 0xFF0000;
299 b = colorB & 0xFF0000;
300 c |= ((a * weightA + b * weightB) / 16) & 0x1FF0000;
301 if (c & 0x01000000) {
302 c = (c & 0x0000FFFF) | 0x00FF0000;
303 }
304#endif
305 return c;
306}
307
308#endif