src/ds/gx/software.c (view raw)
1/* Copyright (c) 2013-2017 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#include <mgba/internal/ds/gx/software.h>
7
8#include <mgba-util/memory.h>
9#include "gba/renderers/software-private.h"
10
11#define SCREEN_SIZE (DS_VIDEO_VERTICAL_PIXELS << 12)
12
13DEFINE_VECTOR(DSGXSoftwarePolygonList, struct DSGXSoftwarePolygon);
14DEFINE_VECTOR(DSGXSoftwareEdgeList, struct DSGXSoftwareEdge);
15DEFINE_VECTOR(DSGXSoftwareSpanList, struct DSGXSoftwareSpan);
16
17static void DSGXSoftwareRendererInit(struct DSGXRenderer* renderer);
18static void DSGXSoftwareRendererReset(struct DSGXRenderer* renderer);
19static void DSGXSoftwareRendererDeinit(struct DSGXRenderer* renderer);
20static void DSGXSoftwareRendererInvalidateTex(struct DSGXRenderer* renderer, int slot);
21static void DSGXSoftwareRendererSetRAM(struct DSGXRenderer* renderer, struct DSGXVertex* verts, struct DSGXPolygon* polys, unsigned polyCount, bool wSort);
22static void DSGXSoftwareRendererDrawScanline(struct DSGXRenderer* renderer, int y);
23static void DSGXSoftwareRendererGetScanline(struct DSGXRenderer* renderer, int y, const color_t** output);
24
25static void _expandColor(uint16_t c15, uint8_t* r, uint8_t* g, uint8_t* b) {
26 *r = ((c15 << 1) & 0x3E) | 1;
27 *g = ((c15 >> 4) & 0x3E) | 1;
28 *b = ((c15 >> 9) & 0x3E) | 1;
29}
30
31static color_t _finishColor(uint8_t r, uint8_t g, uint8_t b, uint8_t a) {
32#ifndef COLOR_16_BIT
33 color_t rgba = (r << 2) & 0xF8;
34 rgba |= (g << 10) & 0xF800;
35 rgba |= (b << 18) & 0xF80000;
36 rgba |= (a << 27) & 0xF8000000;
37 return rgba;
38#else
39#error Unsupported color depth
40#endif
41}
42
43static unsigned _mix32(int weightA, unsigned colorA, int weightB, unsigned colorB) {
44 unsigned c = 0;
45 unsigned a, b;
46#ifdef COLOR_16_BIT
47#error Unsupported color depth
48#else
49 a = colorA & 0xFF;
50 b = colorB & 0xFF;
51 c |= ((a * weightA + b * weightB) / 32) & 0x1FF;
52 if (c & 0x00000100) {
53 c = 0x000000FF;
54 }
55
56 a = colorA & 0xFF00;
57 b = colorB & 0xFF00;
58 c |= ((a * weightA + b * weightB) / 32) & 0x1FF00;
59 if (c & 0x00010000) {
60 c = (c & 0x000000FF) | 0x0000FF00;
61 }
62
63 a = colorA & 0xFF0000;
64 b = colorB & 0xFF0000;
65 c |= ((a * weightA + b * weightB) / 32) & 0x1FF0000;
66 if (c & 0x01000000) {
67 c = (c & 0x0000FFFF) | 0x00FF0000;
68 }
69#endif
70 return c;
71}
72
73static unsigned _mixTexels(int weightA, unsigned colorA, int weightB, unsigned colorB) {
74 unsigned c = 0;
75 unsigned a, b;
76 a = colorA & 0x7C1F;
77 b = colorB & 0x7C1F;
78 a |= (colorA & 0x3E0) << 16;
79 b |= (colorB & 0x3E0) << 16;
80 c = ((a * weightA + b * weightB) / 8);
81 if (c & 0x04000000) {
82 c = (c & ~0x07E00000) | 0x03E00000;
83 }
84 if (c & 0x0020) {
85 c = (c & ~0x003F) | 0x001F;
86 }
87 if (c & 0x8000) {
88 c = (c & ~0xF800) | 0x7C00;
89 }
90 c = (c & 0x7C1F) | ((c >> 16) & 0x03E0);
91 return c;
92}
93
94static color_t _lookupColor(struct DSGXSoftwareRenderer* renderer, struct DSGXSoftwareEndpoint* ep, struct DSGXSoftwarePolygon* poly) {
95 // TODO: Optimize
96 uint16_t texel;
97
98 int16_t s = ep->s >> 4;
99 int16_t t = ep->t >> 4;
100 if (!DSGXTexParamsIsSRepeat(poly->poly->texParams)) {
101 if (s < 0) {
102 s = 0;
103 } else if (s >= poly->texW) {
104 s = poly->texW - 1;
105 }
106 } else if (DSGXTexParamsIsSMirror(poly->poly->texParams)) {
107 if (s & poly->texW) {
108 s = poly->texW - s;
109 }
110 s &= poly->texW - 1;
111 } else {
112 s &= poly->texW - 1;
113 }
114 if (!DSGXTexParamsIsTRepeat(poly->poly->texParams)) {
115 if (t < 0) {
116 t = 0;
117 } else if (t >= poly->texH) {
118 t = poly->texW - 1;
119 }
120 } else if (DSGXTexParamsIsTMirror(poly->poly->texParams)) {
121 if (t & poly->texH) {
122 t = poly->texH - t;
123 }
124 t &= poly->texH - 1;
125 } else {
126 t &= poly->texH - 1;
127 }
128
129 uint16_t texelCoord = s + t * poly->texW;
130 uint8_t a = DSGXPolygonAttrsGetAlpha(poly->poly->polyParams);
131 switch (poly->texFormat) {
132 case 0:
133 default:
134 return _finishColor(ep->cr, ep->cg, ep->cb, a);
135 case 1:
136 texel = ((uint8_t*) poly->texBase)[texelCoord];
137 a = (texel >> 5) & 0x7;
138 a = (a << 2) + (a >> 1);
139 texel &= 0x1F;
140 break;
141 case 2:
142 texel = ((uint8_t*) poly->texBase)[texelCoord >> 2];
143 if (texelCoord & 0x3) {
144 texel >>= 2 * texel & 3;
145 }
146 texel &= 0x3;
147 break;
148 case 3:
149 texel = ((uint8_t*) poly->texBase)[texelCoord >> 1];
150 if (texelCoord & 0x1) {
151 texel >>= 4;
152 }
153 texel &= 0xF;
154 break;
155 case 4:
156 texel = ((uint8_t*) poly->texBase)[texelCoord];
157 break;
158 case 5:
159 texelCoord = (s & ~3) + (t & 3) + (t >> 2) * poly->texW;
160 texel = ((uint8_t*) poly->texBase)[texelCoord];
161 texel >>= (s & 3) * 2;
162 texel &= 3;
163 break;
164 case 6:
165 texel = ((uint8_t*) poly->texBase)[texelCoord];
166 a = (texel >> 3) & 0x1F;
167 texel &= 0x7;
168 break;
169 case 7:
170 return _finishColor(0x3F, 0x3F, 0x3F, 0x1F);
171 }
172 uint8_t r, g, b;
173 unsigned wr, wg, wb;
174 if (poly->texFormat == 5) {
175 // TODO: Slot 2 uses upper half
176 uint16_t texel2 = renderer->d.tex[1][texelCoord >> 1];
177 int a = 0x8;
178 int b = 0;
179 switch (texel2 >> 14) {
180 case 0:
181 if (texel == 3) {
182 return 0;
183 }
184 texel = poly->palBase[texel + (texel2 & 0x3FFF) * 2];
185 break;
186 case 1:
187 if (texel == 3) {
188 return 0;
189 }
190 if (texel != 2) {
191 texel = poly->palBase[texel + (texel2 & 0x3FFF) * 2];
192 } else {
193 texel = poly->palBase[(texel2 & 0x3FFF) * 2];
194 texel2 = poly->palBase[(texel2 & 0x3FFF) * 2 + 1];
195 a = 4;
196 b = 4;
197 }
198 break;
199 case 2:
200 texel = poly->palBase[texel + (texel2 & 0x3FFF) * 2];
201 break;
202 case 3:
203 switch (texel) {
204 case 0:
205 case 1:
206 texel = poly->palBase[texel + (texel2 & 0x3FFF) * 2];
207 break;
208 case 2:
209 texel = poly->palBase[(texel2 & 0x3FFF) * 2];
210 texel2 = poly->palBase[(texel2 & 0x3FFF) * 2 + 1];
211 a = 5;
212 b = 3;
213 break;
214 case 3:
215 texel = poly->palBase[(texel2 & 0x3FFF) * 2];
216 texel2 = poly->palBase[(texel2 & 0x3FFF) * 2 + 1];
217 a = 3;
218 b = 5;
219 break;
220 }
221 break;
222 }
223 if (b) {
224 texel = _mixTexels(a, texel, b, texel2);
225 }
226 } else {
227 if (DSGXTexParamsIs0Transparent(poly->poly->texParams) && !texel) {
228 return 0;
229 }
230 texel = poly->palBase[texel];
231 }
232 _expandColor(texel, &r, &g, &b);
233 switch (poly->blendFormat) {
234 case 1:
235 default:
236 // TODO: Alpha
237 return _finishColor(r, g, b, a);
238 case 0:
239 wr = ((r + 1) * (ep->cr + 1) - 1) >> 6;
240 wg = ((g + 1) * (ep->cg + 1) - 1) >> 6;
241 wb = ((b + 1) * (ep->cb + 1) - 1) >> 6;
242 return _finishColor(wr, wg, wb, a);
243 }
244}
245
246static bool _edgeToSpan(struct DSGXSoftwareSpan* span, const struct DSGXSoftwareEdge* edge, int index, int32_t y) {
247 int32_t height = edge->y1 - edge->y0;
248 int64_t yw = (y << 12) - edge->y0;
249 if (!height) {
250 return false;
251 }
252 // Clamp to bounds
253 if (yw < 0) {
254 return false;
255 } else if (yw > height) {
256 return false;
257 }
258 yw *= 0x100000000LL / height;
259
260 span->ep[index].x = (((int64_t) (edge->x1 - edge->x0) * yw) >> 32) + edge->x0;
261
262 if (index && span->ep[0].x > span->ep[index].x) {
263 int32_t temp = span->ep[index].x;
264 span->ep[index] = span->ep[0];
265 span->ep[0].x = temp;
266 index = 0;
267 }
268 int32_t w0 = edge->w0;
269 int32_t w1 = edge->w1;
270 int32_t w = (((int64_t) (edge->w1 - edge->w0) * yw) >> 32) + edge->w0;
271 int64_t wRecip;// = 0x1000000000000LL / w;
272 // XXX: Disable perspective correction until I figure out how to fix it
273 wRecip = 0x100000000;
274 w0 = 0x10000;
275 w1 = 0x10000;
276 span->ep[index].w = w;
277 span->ep[index].z = (((edge->z1 - edge->z0) * yw) >> 32) + edge->z0;
278 span->ep[index].cr = (((((edge->cr1 * (int64_t) w1 - edge->cr0 * (int64_t) w0) * yw) >> 32) + edge->cr0 * (int64_t) w0) * wRecip) >> 48;
279 span->ep[index].cg = (((((edge->cg1 * (int64_t) w1 - edge->cg0 * (int64_t) w0) * yw) >> 32) + edge->cg0 * (int64_t) w0) * wRecip) >> 48;
280 span->ep[index].cb = (((((edge->cb1 * (int64_t) w1 - edge->cb0 * (int64_t) w0) * yw) >> 32) + edge->cb0 * (int64_t) w0) * wRecip) >> 48;
281 span->ep[index].s = (((((edge->s1 * (int64_t) w1 - edge->s0 * (int64_t) w0) * yw) >> 32) + edge->s0 * (int64_t) w0) * wRecip) >> 48;
282 span->ep[index].t = (((((edge->t1 * (int64_t) w1 - edge->t0 * (int64_t) w0) * yw) >> 32) + edge->t0 * (int64_t) w0) * wRecip) >> 48;
283
284 return true;
285}
286
287static void _lerpEndpoint(const struct DSGXSoftwareSpan* span, struct DSGXSoftwareEndpoint* ep, unsigned x) {
288 int64_t width = span->ep[1].x - span->ep[0].x;
289 int64_t xw = ((uint64_t) x << 12) - span->ep[0].x;
290 if (!width) {
291 return; // TODO?
292 }
293 // Clamp to bounds
294 if (xw < 0) {
295 xw = 0;
296 } else if (xw > width) {
297 xw = width;
298 }
299 xw *= 0x100000000LL / width;
300 int32_t w0 = span->ep[0].w;
301 int32_t w1 = span->ep[1].w;
302 int64_t w = (((int64_t) (w1 - w0) * xw) >> 32) + w0;
303 int64_t wRecip;// = 0x1000000000000LL / w;
304 ep->w = w;
305 // XXX: Disable perspective correction until I figure out how to fix it
306 wRecip = 0x100000000;
307 w0 = 0x10000;
308 w1 = 0x10000;
309
310 ep->z = (((span->ep[1].z - span->ep[0].z) * xw) >> 32) + span->ep[0].z;
311
312 uint64_t r = (((span->ep[1].cr * (int64_t) w1 - span->ep[0].cr * (int64_t) w0) * xw) >> 32) + span->ep[0].cr * (int64_t) w0;
313 uint64_t g = (((span->ep[1].cg * (int64_t) w1 - span->ep[0].cg * (int64_t) w0) * xw) >> 32) + span->ep[0].cg * (int64_t) w0;
314 uint64_t b = (((span->ep[1].cb * (int64_t) w1 - span->ep[0].cb * (int64_t) w0) * xw) >> 32) + span->ep[0].cb * (int64_t) w0;
315 ep->cr = (r * wRecip) >> 48;
316 ep->cg = (g * wRecip) >> 48;
317 ep->cb = (b * wRecip) >> 48;
318
319 int32_t s = (((span->ep[1].s * (int64_t) w1 - span->ep[0].s * (int64_t) w0) * xw) >> 32) + span->ep[0].s * (int64_t) w0;
320 int32_t t = (((span->ep[1].t * (int64_t) w1 - span->ep[0].t * (int64_t) w0) * xw) >> 32) + span->ep[0].t * (int64_t) w0;
321 ep->s = (s * wRecip) >> 48;
322 ep->t = (t * wRecip) >> 48;
323}
324
325void DSGXSoftwareRendererCreate(struct DSGXSoftwareRenderer* renderer) {
326 renderer->d.init = DSGXSoftwareRendererInit;
327 renderer->d.reset = DSGXSoftwareRendererReset;
328 renderer->d.deinit = DSGXSoftwareRendererDeinit;
329 renderer->d.invalidateTex = DSGXSoftwareRendererInvalidateTex;
330 renderer->d.setRAM = DSGXSoftwareRendererSetRAM;
331 renderer->d.drawScanline = DSGXSoftwareRendererDrawScanline;
332 renderer->d.getScanline = DSGXSoftwareRendererGetScanline;
333}
334
335static void DSGXSoftwareRendererInit(struct DSGXRenderer* renderer) {
336 struct DSGXSoftwareRenderer* softwareRenderer = (struct DSGXSoftwareRenderer*) renderer;
337 DSGXSoftwarePolygonListInit(&softwareRenderer->activePolys, DS_GX_POLYGON_BUFFER_SIZE / 4);
338 DSGXSoftwareEdgeListInit(&softwareRenderer->activeEdges, DS_GX_POLYGON_BUFFER_SIZE);
339 DSGXSoftwareSpanListInit(&softwareRenderer->activeSpans, DS_GX_POLYGON_BUFFER_SIZE / 2);
340 softwareRenderer->bucket = anonymousMemoryMap(sizeof(*softwareRenderer->bucket) * DS_GX_POLYGON_BUFFER_SIZE);
341 softwareRenderer->scanlineCache = anonymousMemoryMap(sizeof(color_t) * DS_VIDEO_VERTICAL_PIXELS * DS_VIDEO_HORIZONTAL_PIXELS);
342}
343
344static void DSGXSoftwareRendererReset(struct DSGXRenderer* renderer) {
345 struct DSGXSoftwareRenderer* softwareRenderer = (struct DSGXSoftwareRenderer*) renderer;
346 softwareRenderer->flushPending = false;
347}
348
349static void DSGXSoftwareRendererDeinit(struct DSGXRenderer* renderer) {
350 struct DSGXSoftwareRenderer* softwareRenderer = (struct DSGXSoftwareRenderer*) renderer;
351 DSGXSoftwarePolygonListDeinit(&softwareRenderer->activePolys);
352 DSGXSoftwareEdgeListDeinit(&softwareRenderer->activeEdges);
353 DSGXSoftwareSpanListDeinit(&softwareRenderer->activeSpans);
354 mappedMemoryFree(softwareRenderer->bucket, sizeof(*softwareRenderer->bucket) * DS_GX_POLYGON_BUFFER_SIZE);
355 mappedMemoryFree(softwareRenderer->scanlineCache, sizeof(color_t) * DS_VIDEO_VERTICAL_PIXELS * DS_VIDEO_HORIZONTAL_PIXELS);
356}
357
358static void DSGXSoftwareRendererInvalidateTex(struct DSGXRenderer* renderer, int slot) {
359 struct DSGXSoftwareRenderer* softwareRenderer = (struct DSGXSoftwareRenderer*) renderer;
360 // TODO
361}
362
363static void DSGXSoftwareRendererSetRAM(struct DSGXRenderer* renderer, struct DSGXVertex* verts, struct DSGXPolygon* polys, unsigned polyCount, bool wSort) {
364 struct DSGXSoftwareRenderer* softwareRenderer = (struct DSGXSoftwareRenderer*) renderer;
365
366 softwareRenderer->flushPending = true;
367 softwareRenderer->wSort = wSort;
368 softwareRenderer->verts = verts;
369 DSGXSoftwarePolygonListClear(&softwareRenderer->activePolys);
370 DSGXSoftwareEdgeListClear(&softwareRenderer->activeEdges);
371 unsigned i;
372 for (i = 0; i < polyCount; ++i) {
373 struct DSGXSoftwarePolygon* poly = DSGXSoftwarePolygonListAppend(&softwareRenderer->activePolys);
374 struct DSGXSoftwareEdge* edge = DSGXSoftwareEdgeListAppend(&softwareRenderer->activeEdges);
375 poly->poly = &polys[i];
376 poly->texFormat = DSGXTexParamsGetFormat(poly->poly->texParams);
377 poly->blendFormat = DSGXPolygonAttrsGetMode(poly->poly->polyParams);
378 poly->texW = 8 << DSGXTexParamsGetSSize(poly->poly->texParams);
379 poly->texH = 8 << DSGXTexParamsGetTSize(poly->poly->texParams);
380 switch (poly->texFormat) {
381 case 0:
382 case 7:
383 poly->texBase = NULL;
384 poly->palBase = NULL;
385 break;
386 case 2:
387 poly->texBase = &renderer->tex[DSGXTexParamsGetVRAMBase(poly->poly->texParams) >> VRAM_BLOCK_OFFSET][(DSGXTexParamsGetVRAMBase(poly->poly->texParams) << 2) & 0xFFFF];
388 poly->palBase = &renderer->texPal[poly->poly->palBase >> 12][(poly->poly->palBase << 2) & 0x1FFF];
389 break;
390 default:
391 poly->texBase = &renderer->tex[DSGXTexParamsGetVRAMBase(poly->poly->texParams) >> VRAM_BLOCK_OFFSET][(DSGXTexParamsGetVRAMBase(poly->poly->texParams) << 2) & 0xFFFF];
392 poly->palBase = &renderer->texPal[poly->poly->palBase >> 11][(poly->poly->palBase << 3) & 0x1FFF];
393 break;
394 }
395 edge->polyId = i;
396
397 struct DSGXVertex* v0 = &verts[poly->poly->vertIds[0]];
398 struct DSGXVertex* v1;
399
400 int v;
401 for (v = 1; v < poly->poly->verts; ++v) {
402 v1 = &verts[poly->poly->vertIds[v]];
403 if (v0->vy >= v1->vy) {
404 edge->y0 = SCREEN_SIZE - v0->vy;
405 edge->x0 = v0->vx;
406 edge->z0 = v0->vz;
407 edge->w0 = v0->vw;
408 _expandColor(v0->color, &edge->cr0, &edge->cg0, &edge->cb0);
409 edge->s0 = v0->vs;
410 edge->t0 = v0->vt;
411
412 edge->y1 = SCREEN_SIZE - v1->vy;
413 edge->x1 = v1->vx;
414 edge->z1 = v1->vz;
415 edge->w1 = v1->vw;
416 _expandColor(v1->color, &edge->cr1, &edge->cg1, &edge->cb1);
417 edge->s1 = v1->vs;
418 edge->t1 = v1->vt;
419 } else {
420 edge->y0 = SCREEN_SIZE - v1->vy;
421 edge->x0 = v1->vx;
422 edge->z0 = v1->vz;
423 edge->w0 = v1->vw;
424 _expandColor(v1->color, &edge->cr0, &edge->cg0, &edge->cb0);
425 edge->s0 = v1->vs;
426 edge->t0 = v1->vt;
427
428 edge->y1 = SCREEN_SIZE - v0->vy;
429 edge->x1 = v0->vx;
430 edge->z1 = v0->vz;
431 edge->w1 = v0->vw;
432 _expandColor(v0->color, &edge->cr1, &edge->cg1, &edge->cb1);
433 edge->s1 = v0->vs;
434 edge->t1 = v0->vt;
435 }
436
437 edge = DSGXSoftwareEdgeListAppend(&softwareRenderer->activeEdges);
438 edge->polyId = i;
439 v0 = v1;
440 }
441
442 v1 = &verts[poly->poly->vertIds[0]];
443 if (v0->vy >= v1->vy) {
444 edge->y0 = SCREEN_SIZE - v0->vy;
445 edge->x0 = v0->vx;
446 edge->z0 = v0->vz;
447 edge->w0 = v0->vw;
448 _expandColor(v0->color, &edge->cr0, &edge->cg0, &edge->cb0);
449 edge->s0 = v0->vs;
450 edge->t0 = v0->vt;
451
452 edge->y1 = SCREEN_SIZE - v1->vy;
453 edge->x1 = v1->vx;
454 edge->z1 = v1->vz;
455 edge->w1 = v1->vw;
456 _expandColor(v1->color, &edge->cr1, &edge->cg1, &edge->cb1);
457 edge->s1 = v1->vs;
458 edge->t1 = v1->vt;
459 } else {
460 edge->y0 = SCREEN_SIZE - v1->vy;
461 edge->x0 = v1->vx;
462 edge->w0 = v1->vw;
463 edge->z0 = v1->vz;
464 _expandColor(v1->color, &edge->cr0, &edge->cg0, &edge->cb0);
465 edge->s0 = v1->vs;
466 edge->t0 = v1->vt;
467
468 edge->y1 = SCREEN_SIZE - v0->vy;
469 edge->x1 = v0->vx;
470 edge->z1 = v0->vz;
471 edge->w1 = v0->vw;
472 _expandColor(v0->color, &edge->cr1, &edge->cg1, &edge->cb1);
473 edge->s1 = v0->vs;
474 edge->t1 = v0->vt;
475 }
476 }
477}
478
479static void DSGXSoftwareRendererDrawScanline(struct DSGXRenderer* renderer, int y) {
480 struct DSGXSoftwareRenderer* softwareRenderer = (struct DSGXSoftwareRenderer*) renderer;
481 if (!softwareRenderer->flushPending) {
482 return;
483 }
484 DSGXSoftwareSpanListClear(&softwareRenderer->activeSpans);
485 memset(softwareRenderer->bucket, 0, sizeof(*softwareRenderer->bucket) * DS_GX_POLYGON_BUFFER_SIZE);
486 size_t i;
487 for (i = 0; i < DSGXSoftwareEdgeListSize(&softwareRenderer->activeEdges); ++i) {
488 struct DSGXSoftwareEdge* edge = DSGXSoftwareEdgeListGetPointer(&softwareRenderer->activeEdges, i);
489 if (edge->y1 >> 12 < y) {
490 continue;
491 } else if (edge->y0 >> 12 > y) {
492 continue;
493 }
494
495 unsigned poly = edge->polyId;
496 struct DSGXSoftwareSpan* span = softwareRenderer->bucket[poly];
497 if (span && !span->ep[1].w) {
498 if (_edgeToSpan(span, edge, 1, y)) {
499 softwareRenderer->bucket[poly] = NULL;
500 }
501 } else if (!span) {
502 span = DSGXSoftwareSpanListAppend(&softwareRenderer->activeSpans);
503 memset(&span->ep[1], 0, sizeof(span->ep[1]));
504 span->poly = DSGXSoftwarePolygonListGetPointer(&softwareRenderer->activePolys, poly);
505 if (!_edgeToSpan(span, edge, 0, y)) {
506 // Horizontal line
507 DSGXSoftwareSpanListShift(&softwareRenderer->activeSpans, DSGXSoftwareSpanListSize(&softwareRenderer->activeSpans) - 1, 1);
508 } else {
509 softwareRenderer->bucket[poly] = span;
510 }
511 }
512 }
513
514 color_t* scanline = &softwareRenderer->scanlineCache[DS_VIDEO_HORIZONTAL_PIXELS * y];
515 memset(scanline, 0, sizeof(color_t) * DS_VIDEO_HORIZONTAL_PIXELS);
516 for (i = 0; i < DS_VIDEO_HORIZONTAL_PIXELS; i += 4) {
517 softwareRenderer->depthBuffer[i] = INT32_MAX;
518 softwareRenderer->depthBuffer[i + 1] = INT32_MAX;
519 softwareRenderer->depthBuffer[i + 2] = INT32_MAX;
520 softwareRenderer->depthBuffer[i + 3] = INT32_MAX;
521 }
522
523 for (i = 0; i < DSGXSoftwareSpanListSize(&softwareRenderer->activeSpans); ++i) {
524 struct DSGXSoftwareSpan* span = DSGXSoftwareSpanListGetPointer(&softwareRenderer->activeSpans, i);
525
526 int32_t x = span->ep[0].x >> 12;
527 if (x < 0) {
528 x = 0;
529 }
530 for (; x < span->ep[1].x >> 12 && x < DS_VIDEO_HORIZONTAL_PIXELS; ++x) {
531 struct DSGXSoftwareEndpoint ep;
532 _lerpEndpoint(span, &ep, x);
533 color_t color = _lookupColor(softwareRenderer, &ep, span->poly);
534 unsigned a = color >> 27;
535 if (a == 0x1F) {
536 if (softwareRenderer->wSort) {
537 if (ep.w < softwareRenderer->depthBuffer[x]) {
538 softwareRenderer->depthBuffer[x] = ep.w;
539 scanline[x] = color;
540 }
541 } else {
542 if (ep.z < softwareRenderer->depthBuffer[x]) {
543 softwareRenderer->depthBuffer[x] = ep.z;
544 scanline[x] = color;
545 }
546 }
547 } else if (a) {
548 // TODO: Disable alpha?
549 color = _mix32(a, color, 0x1F - a, scanline[x]);
550 if (scanline[x] >> 27 > a) {
551 a = scanline[x] >> 27;
552 }
553 color |= a << 27;
554 if (softwareRenderer->wSort) {
555 if (ep.w < softwareRenderer->depthBuffer[x]) {
556 softwareRenderer->depthBuffer[x] = ep.w;
557 scanline[x] = color;
558 }
559 } else {
560 if (ep.z < softwareRenderer->depthBuffer[x]) {
561 softwareRenderer->depthBuffer[x] = ep.z;
562 scanline[x] = color;
563 }
564 }
565 }
566 }
567 }
568
569 if (y == DS_VIDEO_VERTICAL_PIXELS - 1) {
570 softwareRenderer->flushPending = false;
571 }
572}
573
574static void DSGXSoftwareRendererGetScanline(struct DSGXRenderer* renderer, int y, const color_t** output) {
575 struct DSGXSoftwareRenderer* softwareRenderer = (struct DSGXSoftwareRenderer*) renderer;
576 *output = &softwareRenderer->scanlineCache[DS_VIDEO_HORIZONTAL_PIXELS * y];
577}