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 "video-software.h"
10
11#ifdef NDEBUG
12#define VIDEO_CHECKS false
13#else
14#define VIDEO_CHECKS true
15#endif
16
17void GBAVideoSoftwareRendererDrawBackgroundMode0(struct GBAVideoSoftwareRenderer* renderer,
18 struct GBAVideoSoftwareBackground* background, int y);
19void GBAVideoSoftwareRendererDrawBackgroundMode2(struct GBAVideoSoftwareRenderer* renderer,
20 struct GBAVideoSoftwareBackground* background, int y);
21void GBAVideoSoftwareRendererDrawBackgroundMode3(struct GBAVideoSoftwareRenderer* renderer,
22 struct GBAVideoSoftwareBackground* background, int y);
23void GBAVideoSoftwareRendererDrawBackgroundMode4(struct GBAVideoSoftwareRenderer* renderer,
24 struct GBAVideoSoftwareBackground* background, int y);
25void GBAVideoSoftwareRendererDrawBackgroundMode5(struct GBAVideoSoftwareRenderer* renderer,
26 struct GBAVideoSoftwareBackground* background, int y);
27
28int GBAVideoSoftwareRendererPreprocessSprite(struct GBAVideoSoftwareRenderer* renderer, struct GBAObj* sprite, int y);
29void GBAVideoSoftwareRendererPostprocessSprite(struct GBAVideoSoftwareRenderer* renderer, unsigned priority);
30
31static inline unsigned _brighten(unsigned color, int y);
32static inline unsigned _darken(unsigned color, int y);
33static unsigned _mix(int weightA, unsigned colorA, int weightB, unsigned colorB);
34
35
36// We stash the priority on the top bits so we can do a one-operator comparison
37// The lower the number, the higher the priority, and sprites take precedence over backgrounds
38// We want to do special processing if the color pixel is target 1, however
39
40static inline void _compositeBlendObjwin(struct GBAVideoSoftwareRenderer* renderer, uint32_t* pixel, uint32_t color, uint32_t current) {
41 if (color >= current) {
42 if (current & FLAG_TARGET_1 && color & FLAG_TARGET_2) {
43 color = _mix(renderer->blda, current, renderer->bldb, color);
44 } else {
45 color = (current & 0x00FFFFFF) | ((current << 1) & FLAG_REBLEND);
46 }
47 } else {
48 color = (color & ~FLAG_TARGET_2) | (current & FLAG_OBJWIN);
49 }
50 *pixel = color;
51}
52
53static inline void _compositeBlendNoObjwin(struct GBAVideoSoftwareRenderer* renderer, uint32_t* pixel, uint32_t color, uint32_t current) {
54 if (color >= current) {
55 if (current & FLAG_TARGET_1 && color & FLAG_TARGET_2) {
56 color = _mix(renderer->blda, current, renderer->bldb, color);
57 } else {
58 color = (current & 0x00FFFFFF) | ((current << 1) & FLAG_REBLEND);
59 }
60 } else {
61 color = color & ~FLAG_TARGET_2;
62 }
63 *pixel = color;
64}
65
66static inline void _compositeNoBlendObjwin(struct GBAVideoSoftwareRenderer* renderer, uint32_t* pixel, uint32_t color,
67 uint32_t current) {
68 UNUSED(renderer);
69 if (color < current) {
70 color |= (current & FLAG_OBJWIN);
71 } else {
72 color = (current & 0x00FFFFFF) | ((current << 1) & FLAG_REBLEND);
73 }
74 *pixel = color;
75}
76
77static inline void _compositeNoBlendNoObjwin(struct GBAVideoSoftwareRenderer* renderer, uint32_t* pixel, uint32_t color,
78 uint32_t current) {
79 UNUSED(renderer);
80 if (color >= current) {
81 color = (current & 0x00FFFFFF) | ((current << 1) & FLAG_REBLEND);
82 }
83 *pixel = color;
84}
85
86#define COMPOSITE_16_OBJWIN(BLEND, IDX) \
87 if (objwinForceEnable || (!(current & FLAG_OBJWIN)) == objwinOnly) { \
88 unsigned color = (current & FLAG_OBJWIN) ? objwinPalette[paletteData | pixelData] : palette[pixelData]; \
89 unsigned mergedFlags = flags; \
90 if (current & FLAG_OBJWIN) { \
91 mergedFlags = objwinFlags; \
92 } \
93 _composite ## BLEND ## Objwin(renderer, &pixel[IDX], color | mergedFlags, current); \
94 }
95
96#define COMPOSITE_16_NO_OBJWIN(BLEND, IDX) \
97 _composite ## BLEND ## NoObjwin(renderer, &pixel[IDX], palette[pixelData] | flags, current);
98
99#define COMPOSITE_256_OBJWIN(BLEND, IDX) \
100 if (objwinForceEnable || (!(current & FLAG_OBJWIN)) == objwinOnly) { \
101 unsigned color = (current & FLAG_OBJWIN) ? objwinPalette[pixelData] : palette[pixelData]; \
102 unsigned mergedFlags = flags; \
103 if (current & FLAG_OBJWIN) { \
104 mergedFlags = objwinFlags; \
105 } \
106 _composite ## BLEND ## Objwin(renderer, &pixel[IDX], color | mergedFlags, current); \
107 }
108
109#define COMPOSITE_256_NO_OBJWIN COMPOSITE_16_NO_OBJWIN
110
111#define BACKGROUND_DRAW_PIXEL_16(BLEND, OBJWIN, IDX) \
112 pixelData = tileData & 0xF; \
113 current = pixel[IDX]; \
114 if (pixelData && IS_WRITABLE(current)) { \
115 COMPOSITE_16_ ## OBJWIN (BLEND, IDX); \
116 } \
117 tileData >>= 4;
118
119#define BACKGROUND_DRAW_PIXEL_256(BLEND, OBJWIN, IDX) \
120 pixelData = tileData & 0xFF; \
121 current = pixel[IDX]; \
122 if (pixelData && IS_WRITABLE(current)) { \
123 COMPOSITE_256_ ## OBJWIN (BLEND, IDX); \
124 } \
125 tileData >>= 8;
126
127// TODO: Remove UNUSEDs after implementing OBJWIN for modes 3 - 5
128#define PREPARE_OBJWIN \
129 int objwinSlowPath = GBARegisterDISPCNTIsObjwinEnable(renderer->dispcnt); \
130 int objwinOnly = 0; \
131 int objwinForceEnable = 0; \
132 UNUSED(objwinForceEnable); \
133 color_t* objwinPalette = renderer->normalPalette; \
134 UNUSED(objwinPalette); \
135 if (objwinSlowPath) { \
136 if (background->target1 && GBAWindowControlIsBlendEnable(renderer->objwin.packed) && \
137 (renderer->blendEffect == BLEND_BRIGHTEN || renderer->blendEffect == BLEND_DARKEN)) { \
138 objwinPalette = renderer->variantPalette; \
139 } \
140 switch (background->index) { \
141 case 0: \
142 objwinForceEnable = GBAWindowControlIsBg0Enable(renderer->objwin.packed) && \
143 GBAWindowControlIsBg0Enable(renderer->currentWindow.packed); \
144 objwinOnly = !GBAWindowControlIsBg0Enable(renderer->objwin.packed); \
145 break; \
146 case 1: \
147 objwinForceEnable = GBAWindowControlIsBg1Enable(renderer->objwin.packed) && \
148 GBAWindowControlIsBg1Enable(renderer->currentWindow.packed); \
149 objwinOnly = !GBAWindowControlIsBg1Enable(renderer->objwin.packed); \
150 break; \
151 case 2: \
152 objwinForceEnable = GBAWindowControlIsBg2Enable(renderer->objwin.packed) && \
153 GBAWindowControlIsBg2Enable(renderer->currentWindow.packed); \
154 objwinOnly = !GBAWindowControlIsBg2Enable(renderer->objwin.packed); \
155 break; \
156 case 3: \
157 objwinForceEnable = GBAWindowControlIsBg3Enable(renderer->objwin.packed) && \
158 GBAWindowControlIsBg3Enable(renderer->currentWindow.packed); \
159 objwinOnly = !GBAWindowControlIsBg3Enable(renderer->objwin.packed); \
160 break; \
161 } \
162 }
163
164#define BACKGROUND_BITMAP_INIT \
165 int32_t x = background->sx + (renderer->start - 1) * background->dx; \
166 int32_t y = background->sy + (renderer->start - 1) * background->dy; \
167 int mosaicH = 0; \
168 int mosaicWait = 0; \
169 if (background->mosaic) { \
170 int mosaicV = GBAMosaicControlGetBgV(renderer->mosaic) + 1; \
171 y -= (inY % mosaicV) * background->dmy; \
172 x -= (inY % mosaicV) * background->dmx; \
173 mosaicH = GBAMosaicControlGetBgH(renderer->mosaic); \
174 mosaicWait = renderer->start % (mosaicH + 1); \
175 } \
176 int32_t localX; \
177 int32_t localY; \
178 \
179 uint32_t flags = (background->priority << OFFSET_PRIORITY) | (background->index << OFFSET_INDEX) | FLAG_IS_BACKGROUND; \
180 flags |= FLAG_TARGET_2 * background->target2; \
181 int objwinFlags = FLAG_TARGET_1 * (background->target1 && renderer->blendEffect == BLEND_ALPHA && \
182 GBAWindowControlIsBlendEnable(renderer->objwin.packed)); \
183 objwinFlags |= flags; \
184 flags |= FLAG_TARGET_1 * (background->target1 && renderer->blendEffect == BLEND_ALPHA && \
185 GBAWindowControlIsBlendEnable(renderer->currentWindow.packed)); \
186 if (renderer->blendEffect == BLEND_ALPHA && renderer->blda == 0x10 && renderer->bldb == 0) { \
187 flags &= ~(FLAG_TARGET_1 | FLAG_TARGET_2); \
188 objwinFlags &= ~(FLAG_TARGET_1 | FLAG_TARGET_2); \
189 } \
190 int variant = background->target1 && GBAWindowControlIsBlendEnable(renderer->currentWindow.packed) && \
191 (renderer->blendEffect == BLEND_BRIGHTEN || renderer->blendEffect == BLEND_DARKEN); \
192 color_t* palette = renderer->normalPalette; \
193 if (variant) { \
194 palette = renderer->variantPalette; \
195 } \
196 UNUSED(palette); \
197 PREPARE_OBJWIN;
198
199#define BACKGROUND_BITMAP_ITERATE(W, H) \
200 x += background->dx; \
201 y += background->dy; \
202 \
203 if (x < 0 || y < 0 || (x >> 8) >= W || (y >> 8) >= H) { \
204 continue; \
205 } else { \
206 localX = x; \
207 localY = y; \
208 }
209
210static inline unsigned _brighten(unsigned color, int y) {
211 unsigned c = 0;
212 unsigned a;
213#ifdef COLOR_16_BIT
214 a = color & 0x1F;
215 c |= (a + ((0x1F - a) * y) / 16) & 0x1F;
216
217#ifdef COLOR_5_6_5
218 a = color & 0x7C0;
219 c |= (a + ((0x7C0 - a) * y) / 16) & 0x7C0;
220
221 a = color & 0xF800;
222 c |= (a + ((0xF800 - a) * y) / 16) & 0xF800;
223#else
224 a = color & 0x3E0;
225 c |= (a + ((0x3E0 - a) * y) / 16) & 0x3E0;
226
227 a = color & 0x7C00;
228 c |= (a + ((0x7C00 - a) * y) / 16) & 0x7C00;
229#endif
230#else
231 a = color & 0xF8;
232 c |= (a + ((0xF8 - a) * y) / 16) & 0xF8;
233
234 a = color & 0xF800;
235 c |= (a + ((0xF800 - a) * y) / 16) & 0xF800;
236
237 a = color & 0xF80000;
238 c |= (a + ((0xF80000 - a) * y) / 16) & 0xF80000;
239#endif
240 return c;
241}
242
243static inline unsigned _darken(unsigned color, int y) {
244 unsigned c = 0;
245 unsigned a;
246#ifdef COLOR_16_BIT
247 a = color & 0x1F;
248 c |= (a - (a * y) / 16) & 0x1F;
249
250#ifdef COLOR_5_6_5
251 a = color & 0x7C0;
252 c |= (a - (a * y) / 16) & 0x7C0;
253
254 a = color & 0xF800;
255 c |= (a - (a * y) / 16) & 0xF800;
256#else
257 a = color & 0x3E0;
258 c |= (a - (a * y) / 16) & 0x3E0;
259
260 a = color & 0x7C00;
261 c |= (a - (a * y) / 16) & 0x7C00;
262#endif
263#else
264 a = color & 0xF8;
265 c |= (a - (a * y) / 16) & 0xF8;
266
267 a = color & 0xF800;
268 c |= (a - (a * y) / 16) & 0xF800;
269
270 a = color & 0xF80000;
271 c |= (a - (a * y) / 16) & 0xF80000;
272#endif
273 return c;
274}
275
276static unsigned _mix(int weightA, unsigned colorA, int weightB, unsigned colorB) {
277 unsigned c = 0;
278 unsigned a, b;
279#ifdef COLOR_16_BIT
280#ifdef COLOR_5_6_5
281 a = colorA & 0xF81F;
282 b = colorB & 0xF81F;
283 a |= (colorA & 0x7C0) << 16;
284 b |= (colorB & 0x7C0) << 16;
285 c = ((a * weightA + b * weightB) / 16);
286 if (c & 0x08000000) {
287 c = (c & ~0x0FC00000) | 0x07C00000;
288 }
289 if (c & 0x0020) {
290 c = (c & ~0x003F) | 0x001F;
291 }
292 if (c & 0x10000) {
293 c = (c & ~0x1F800) | 0xF800;
294 }
295 c = (c & 0xF81F) | ((c >> 16) & 0x07C0);
296#else
297 a = colorA & 0x7C1F;
298 b = colorB & 0x7C1F;
299 a |= (colorA & 0x3E0) << 16;
300 b |= (colorB & 0x3E0) << 16;
301 c = ((a * weightA + b * weightB) / 16);
302 if (c & 0x04000000) {
303 c = (c & ~0x07E00000) | 0x03E00000;
304 }
305 if (c & 0x0020) {
306 c = (c & ~0x003F) | 0x001F;
307 }
308 if (c & 0x8000) {
309 c = (c & ~0xF800) | 0x7C00;
310 }
311 c = (c & 0x7C1F) | ((c >> 16) & 0x03E0);
312#endif
313#else
314 a = colorA & 0xF8;
315 b = colorB & 0xF8;
316 c |= ((a * weightA + b * weightB) / 16) & 0x1F8;
317 if (c & 0x00000100) {
318 c = 0x000000F8;
319 }
320
321 a = colorA & 0xF800;
322 b = colorB & 0xF800;
323 c |= ((a * weightA + b * weightB) / 16) & 0x1F800;
324 if (c & 0x00010000) {
325 c = (c & 0x000000F8) | 0x0000F800;
326 }
327
328 a = colorA & 0xF80000;
329 b = colorB & 0xF80000;
330 c |= ((a * weightA + b * weightB) / 16) & 0x1F80000;
331 if (c & 0x01000000) {
332 c = (c & 0x0000F8F8) | 0x00F80000;
333 }
334#endif
335 return c;
336}
337
338#endif