1/* Copyright (c) 2013-2016 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 "software.h"
  7
  8#include "gb/io.h"
  9#include "util/memory.h"
 10
 11static void GBVideoSoftwareRendererInit(struct GBVideoRenderer* renderer);
 12static void GBVideoSoftwareRendererDeinit(struct GBVideoRenderer* renderer);
 13static void GBVideoSoftwareRendererReset(struct GBVideoRenderer* renderer);
 14static void GBVideoSoftwareRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address);
 15static uint8_t GBVideoSoftwareRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value);
 16static void GBVideoSoftwareRendererDrawScanline(struct GBVideoRenderer* renderer, int y);
 17static void GBVideoSoftwareRendererFinishFrame(struct GBVideoRenderer* renderer);
 18static void GBVideoSoftwareRendererGetPixels(struct GBVideoRenderer* renderer, unsigned* stride, const void** pixels);
 19static void GBVideoSoftwareRendererPutPixels(struct GBVideoRenderer* renderer, unsigned stride, void* pixels);
 20
 21static void GBVideoSoftwareRendererDrawBackground(struct GBVideoSoftwareRenderer* renderer, int y);
 22
 23#ifdef COLOR_16_BIT
 24#ifdef COLOR_5_6_5
 25static const color_t GB_PALETTE[4] = { 0xFFFF, 0x39C7, 0x18C3, 0x0000};
 26#else
 27static const color_t GB_PALETTE[4] = { 0x7FFF, 0x1DE7, 0x0C63, 0x0000};
 28#endif
 29#else
 30static const color_t GB_PALETTE[4] = { 0xFFFFFF, 0x808080, 0x404040, 0x000000};
 31#endif
 32
 33void GBVideoSoftwareRendererCreate(struct GBVideoSoftwareRenderer* renderer) {
 34	renderer->d.init = GBVideoSoftwareRendererInit;
 35	renderer->d.reset = GBVideoSoftwareRendererReset;
 36	renderer->d.deinit = GBVideoSoftwareRendererDeinit;
 37	renderer->d.writeVideoRegister = GBVideoSoftwareRendererWriteVideoRegister;
 38	renderer->d.writeVRAM = GBVideoSoftwareRendererWriteVRAM;
 39	renderer->d.drawScanline = GBVideoSoftwareRendererDrawScanline;
 40	renderer->d.finishFrame = GBVideoSoftwareRendererFinishFrame;
 41	renderer->d.getPixels = 0;
 42	renderer->d.putPixels = 0;
 43
 44	renderer->temporaryBuffer = 0;
 45}
 46
 47static void GBVideoSoftwareRendererInit(struct GBVideoRenderer* renderer) {
 48	GBVideoSoftwareRendererReset(renderer);
 49
 50	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 51
 52	int y;
 53	for (y = 0; y < GB_VIDEO_VERTICAL_PIXELS; ++y) {
 54		color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
 55		int x;
 56		for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; ++x) {
 57			row[x] = GB_PALETTE[0];
 58		}
 59	}
 60}
 61
 62static void GBVideoSoftwareRendererReset(struct GBVideoRenderer* renderer) {
 63	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 64	int i;
 65
 66	// TODO
 67}
 68
 69static void GBVideoSoftwareRendererDeinit(struct GBVideoRenderer* renderer) {
 70	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 71	UNUSED(softwareRenderer);
 72}
 73
 74static void GBVideoSoftwareRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address) {
 75	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 76	// TODO
 77}
 78static uint8_t GBVideoSoftwareRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value) {
 79	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
 80	switch (address) {
 81	case REG_LCDC:
 82		softwareRenderer->lcdc = value;
 83		break;
 84	case REG_BGP:
 85		softwareRenderer->bgPalette[0] = GB_PALETTE[value & 3];
 86		softwareRenderer->bgPalette[1] = GB_PALETTE[(value >> 2) & 3];
 87		softwareRenderer->bgPalette[2] = GB_PALETTE[(value >> 4) & 3];
 88		softwareRenderer->bgPalette[3] = GB_PALETTE[(value >> 6) & 3];
 89		break;
 90	case REG_OBP0:
 91		softwareRenderer->objPalette[0][0] = GB_PALETTE[value & 3];
 92		softwareRenderer->objPalette[0][1] = GB_PALETTE[(value >> 2) & 3];
 93		softwareRenderer->objPalette[0][2] = GB_PALETTE[(value >> 4) & 3];
 94		softwareRenderer->objPalette[0][3] = GB_PALETTE[(value >> 6) & 3];
 95		break;
 96	case REG_OBP1:
 97		softwareRenderer->objPalette[1][0] = GB_PALETTE[value & 3];
 98		softwareRenderer->objPalette[1][1] = GB_PALETTE[(value >> 2) & 3];
 99		softwareRenderer->objPalette[1][2] = GB_PALETTE[(value >> 4) & 3];
100		softwareRenderer->objPalette[1][3] = GB_PALETTE[(value >> 6) & 3];
101		break;
102	}
103	return value;
104}
105
106static void GBVideoSoftwareRendererDrawScanline(struct GBVideoRenderer* renderer, int y) {
107	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
108
109	color_t* row = &softwareRenderer->outputBuffer[softwareRenderer->outputBufferStride * y];
110
111	GBVideoSoftwareRendererDrawBackground(softwareRenderer, y);
112
113	size_t x;
114#ifdef COLOR_16_BIT
115#if defined(__ARM_NEON) && !defined(__APPLE__)
116	_to16Bit(row, softwareRenderer->row, GB_VIDEO_HORIZONTAL_PIXELS);
117#else
118	for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; ++x) {
119		row[x] = softwareRenderer->row[x];
120	}
121#endif
122#else
123	memcpy(row, softwareRenderer->row, GB_VIDEO_HORIZONTAL_PIXELS * sizeof(*row));
124#endif
125}
126
127static void GBVideoSoftwareRendererFinishFrame(struct GBVideoRenderer* renderer) {
128	struct GBVideoSoftwareRenderer* softwareRenderer = (struct GBVideoSoftwareRenderer*) renderer;
129
130	if (softwareRenderer->temporaryBuffer) {
131		mappedMemoryFree(softwareRenderer->temporaryBuffer, GB_VIDEO_HORIZONTAL_PIXELS * GB_VIDEO_VERTICAL_PIXELS * 4);
132		softwareRenderer->temporaryBuffer = 0;
133	}
134}
135
136static void GBVideoSoftwareRendererDrawBackground(struct GBVideoSoftwareRenderer* renderer, int y) {
137	uint8_t* maps = &renderer->d.vram[GB_BASE_MAP];
138	if (GBRegisterLCDCIsTileMap(renderer->lcdc)) {
139		maps += GB_SIZE_MAP;
140	}
141	uint8_t* data = renderer->d.vram;
142	if (!GBRegisterLCDCIsTileData(renderer->lcdc)) {
143		data += 0x1000;
144	}
145	int x;
146	for (x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; ++x) {
147		int bgTile;
148		if (GBRegisterLCDCIsTileData(renderer->lcdc)) {
149			bgTile = maps[(x >> 3) + (0x20 * (y >> 3))];
150		} else {
151			bgTile = ((int8_t*) maps)[(x >> 3) + (0x20 * (y >> 3))];
152		}
153		uint8_t tileDataLower = data[(bgTile * 8 + (y & 7)) * 2];
154		uint8_t tileDataUpper = data[(bgTile * 8 + (y & 7)) * 2 + 1];
155		tileDataUpper >>= 7 - (x & 7);
156		tileDataLower >>= 7 - (x & 7);
157		renderer->row[x] = renderer->bgPalette[((tileDataUpper & 1) << 1) | (tileDataLower & 1)];
158	}
159}