ppsspp/GPU/GLES/TextureCache.cpp

// Copyright (c) 2012- PPSSPP Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

#include <map>
#include <algorithm>

#include "../../Core/MemMap.h"
#include "../ge_constants.h"
#include "../GPUState.h"
#include "TextureCache.h"
#include "../Core/Config.h"

// If a texture hasn't been seen for 200 frames, get rid of it.
#define TEXTURE_KILL_AGE 200
float maxAnisotropyLevel ;

TextureCache::TextureCache() {
	// TODO: Switch to aligned allocations for alignment. AllocateMemoryPages would do the trick.
	// This is 5MB of temporary storage. Might be possible to shrink it.
	tmpTexBuf32 = new u32[1024 * 512];  // 2MB
	tmpTexBuf16 = new u16[1024 * 512];  // 1MB
	tmpTexBufRearrange = new u32[1024 * 512];   // 2MB
	clutBuf32 = new u32[4096];  // 4K
	clutBuf16 = new u16[4096];  // 4K
	glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &maxAnisotropyLevel);
}

TextureCache::~TextureCache() {
	delete [] tmpTexBuf32;
	tmpTexBuf32 = 0;
	delete [] tmpTexBuf16;
	tmpTexBuf16 = 0;
	delete [] tmpTexBufRearrange;
	tmpTexBufRearrange = 0;
	delete [] clutBuf32;
	delete [] clutBuf16;
}

void TextureCache::Clear(bool delete_them) {
	glBindTexture(GL_TEXTURE_2D, 0);
	if (delete_them) {
		for (TexCache::iterator iter = cache.begin(); iter != cache.end(); ++iter) {
			DEBUG_LOG(G3D, "Deleting texture %i", iter->second.texture);
			glDeleteTextures(1, &iter->second.texture);
		}
	}
	if (cache.size()) {
		INFO_LOG(G3D, "Texture cached cleared from %i textures", (int)cache.size());
		cache.clear();
	}
}

// Removes old textures.
void TextureCache::Decimate() {
	glBindTexture(GL_TEXTURE_2D, 0);
	for (TexCache::iterator iter = cache.begin(), end = cache.end(); iter != end; ) {
		if (iter->second.lastFrame + TEXTURE_KILL_AGE < gpuStats.numFrames) {
			glDeleteTextures(1, &iter->second.texture);
			cache.erase(iter++);
		}
		else
			++iter;
	}
}

void TextureCache::Invalidate(u32 addr, int size, bool force) {
	addr &= 0xFFFFFFF;
	u32 addr_end = addr + size;

	for (TexCache::iterator iter = cache.begin(), end = cache.end(); iter != end; ++iter) {
		u32 texAddr = iter->second.addr;
		u32 texEnd = iter->second.addr + iter->second.sizeInRAM;
		// Clear if either the addr or clutaddr is in the range.
		bool invalidate = (texAddr >= addr && texAddr < addr_end) || (texEnd >= addr && texEnd < addr_end);
		invalidate = invalidate || (addr >= texAddr && addr < texEnd) || (addr_end >= texAddr && addr_end < texEnd);

		invalidate = invalidate || (iter->second.clutaddr >= addr && iter->second.clutaddr < addr_end);

		if (invalidate) {
			if (iter->second.status == TexCacheEntry::STATUS_RELIABLE) {
				iter->second.status = TexCacheEntry::STATUS_HASHING;
			}
			if (force) {
				gpuStats.numTextureInvalidations++;
				// Start it over from 0.
				iter->second.numFrames = 0;
				iter->second.framesUntilNextFullHash = 0;
			} else {
				iter->second.invalidHint++;
			}
		}
	}
}

void TextureCache::InvalidateAll(bool force) {
	Invalidate(0, 0xFFFFFFFF, force);
}

TextureCache::TexCacheEntry *TextureCache::GetEntryAt(u32 texaddr) {
	// If no CLUT, as in framebuffer textures, cache key is simply texaddr.
	auto iter = cache.find(texaddr);
	if (iter != cache.end() && iter->second.addr == texaddr)
		return &iter->second;
	else
		return 0;
}

void TextureCache::NotifyFramebuffer(u32 address, FBO *fbo) {
	// Must be in VRAM so | 0x04000000 it is.
	TexCacheEntry *entry = GetEntryAt(address | 0x04000000);
	if (entry) {
		// INFO_LOG(HLE, "Render to texture detected at %08x!", address);
		if (!entry->fbo)
			entry->fbo = fbo;
		// TODO: Delete the original non-fbo texture too.
	}
}

void TextureCache::NotifyFramebufferDestroyed(u32 address, FBO *fbo) {
	TexCacheEntry *entry = GetEntryAt(address | 0x04000000);
	if (entry && entry->fbo) {
		entry->fbo = 0;
	}
}

static u32 GetClutAddr(u32 clutEntrySize) {
	return ((gstate.clutaddr & 0xFFFFFF) | ((gstate.clutaddrupper << 8) & 0x0F000000)) + ((gstate.clutformat >> 16) & 0x1f) * clutEntrySize;
}

static u32 GetClutIndex(u32 index) {
	return ((((gstate.clutformat >> 16) & 0x1f) + index) >> ((gstate.clutformat >> 2) & 0x1f)) & ((gstate.clutformat >> 8) & 0xff);
}

static void ReadClut16(u16 *clutBuf16) {
	u32 clutNumEntries = (gstate.loadclut & 0x3f) * 16;
	u32 clutAddr = GetClutAddr(2);
	if (Memory::IsValidAddress(clutAddr)) {
		for (u32 i = ((gstate.clutformat >> 16) & 0x1f); i < clutNumEntries; i++)
			clutBuf16[i] = Memory::ReadUnchecked_U16(clutAddr + i * 2);
	}
}

static void ReadClut32(u32 *clutBuf32) {
	u32 clutNumEntries = (gstate.loadclut & 0x3f) * 8;
	u32 clutAddr = GetClutAddr(4);
	if (Memory::IsValidAddress(clutAddr)) {
		for (u32 i = ((gstate.clutformat >> 16) & 0x1f); i < clutNumEntries; i++)
			clutBuf32[i] = Memory::ReadUnchecked_U32(clutAddr + i * 4);
	}
}

void *TextureCache::UnswizzleFromMem(u32 texaddr, u32 bytesPerPixel, u32 level) {
	u32 addr = texaddr;
	u32 rowWidth = (bytesPerPixel > 0) ? ((gstate.texbufwidth[level] & 0x3FF) * bytesPerPixel) : ((gstate.texbufwidth[level] & 0x3FF) / 2);
	u32 pitch = rowWidth / 4;
	int bxc = rowWidth / 16;
	int byc = ((1 << ((gstate.texsize[level] >> 8) & 0xf)) + 7) / 8;
	if (byc == 0)
		byc = 1;

	u32 ydest = 0;
	for (int by = 0; by < byc; by++) {
		if (rowWidth >= 16) {
			u32 xdest = ydest;
			for (int bx = 0; bx < bxc; bx++) {
				u32 dest = xdest;
				for (int n = 0; n < 8; n++) {
					for (int k = 0; k < 4; k++) {
						tmpTexBuf32[dest + k] = Memory::ReadUnchecked_U32(addr);
						addr += 4;
					}
					dest += pitch;
				}
				xdest += 4;
			}
			ydest += (rowWidth * 8) / 4;
		} else if (rowWidth == 8) {
			for (int n = 0; n < 8; n++, ydest += 2) {
				tmpTexBuf32[ydest + 0] = Memory::ReadUnchecked_U32(addr + 0);
				tmpTexBuf32[ydest + 1] = Memory::ReadUnchecked_U32(addr + 4);
				addr += 16; // skip two u32
			}
		} else if (rowWidth == 4) {
			for (int n = 0; n < 8; n++, ydest++) {
				tmpTexBuf32[ydest] = Memory::ReadUnchecked_U32(addr);
				addr += 16;
			}
		} else if (rowWidth == 2) {
			for (int n = 0; n < 4; n++, ydest++) {
				u16 n1 = Memory::ReadUnchecked_U16(addr +  0);
				u16 n2 = Memory::ReadUnchecked_U16(addr + 16);
				tmpTexBuf32[ydest] = (u32)n1 | ((u32)n2 << 16);
				addr += 32;
			}
		}
		else if (rowWidth == 1) {
			for (int n = 0; n < 2; n++, ydest++) {
				// This looks wrong, shouldn't it be & 0xFF (that is no mask at all?)
				u8 n1 = Memory::ReadUnchecked_U8(addr +  0) & 0xf;
				u8 n2 = Memory::ReadUnchecked_U8(addr + 16) & 0xf;
				u8 n3 = Memory::ReadUnchecked_U8(addr + 32) & 0xf;
				u8 n4 = Memory::ReadUnchecked_U8(addr + 48) & 0xf;
				tmpTexBuf32[ydest] = (u32)n1 | ((u32)n2 << 8) | ((u32)n3 << 16) | ((u32)n4 << 24);
			}
		}
	}
	return tmpTexBuf32;
}

void *TextureCache::readIndexedTex(int level, u32 texaddr, int bytesPerIndex) {
	int length = (gstate.texbufwidth[level] & 0x3FF) * (1 << ((gstate.texsize[level] >> 8) & 0xf));
	void *buf = NULL;
	switch ((gstate.clutformat & 3)) {
	case GE_CMODE_16BIT_BGR5650:
	case GE_CMODE_16BIT_ABGR5551:
	case GE_CMODE_16BIT_ABGR4444:
		{
		ReadClut16(clutBuf16);
		const u16 *clut = clutBuf16;
		if (!(gstate.texmode & 1)) {
			switch (bytesPerIndex) {
			case 1:
				for (int i = 0; i < length; i++) {
					u8 index = Memory::ReadUnchecked_U8(texaddr + i);
					tmpTexBuf16[i] = clut[GetClutIndex(index)];
				}
				break;

			case 2:
				for (int i = 0; i < length; i++) {
					u16 index = Memory::ReadUnchecked_U16(texaddr + i * 2);
					tmpTexBuf16[i] = clut[GetClutIndex(index)];
				}
				break;

			case 4:
				for (int i = 0; i < length; i++) {
					u32 index = Memory::ReadUnchecked_U32(texaddr + i * 4);
					tmpTexBuf16[i] = clut[GetClutIndex(index)];
				}
				break;
			}
		} else {
			UnswizzleFromMem(texaddr, bytesPerIndex, level);
			switch (bytesPerIndex) {
			case 1:
				for (int i = 0, j = 0; i < length; i += 4, j++) 	{
					u32 n = tmpTexBuf32[j];
					u32 k;
					for (k = 0; k < 4; k++) {
						u8 index = (n >> (k * 8)) & 0xff;
						tmpTexBuf16[i + k] = clut[GetClutIndex(index)];
					}
				}
				break;

			case 2:
				for (int i = 0, j = 0; i < length; i += 2, j++) {
					u32 n = tmpTexBuf32[j];
					tmpTexBuf16[i + 0] = clut[GetClutIndex(n & 0xffff)];
					tmpTexBuf16[i + 1] = clut[GetClutIndex(n >> 16)];
				}
				break;

			case 4:
				for (int i = 0; i < length; i++) {
					u32 n = tmpTexBuf32[i];
					tmpTexBuf16[i] = clut[GetClutIndex(n)];
				}
				break;
			}
		}
		buf = tmpTexBuf16;
		}
		break;

	case GE_CMODE_32BIT_ABGR8888:
		{
		ReadClut32(clutBuf32);
		const u32 *clut = clutBuf32;
		if (!(gstate.texmode & 1)) {
			switch (bytesPerIndex) {
			case 1:
				for (int i = 0; i < length; i++) {
					u8 index = Memory::ReadUnchecked_U8(texaddr + i);
					tmpTexBuf32[i] = clut[GetClutIndex(index)];
				}
				break;

			case 2:
				for (int i = 0; i < length; i++) {
					u16 index = Memory::ReadUnchecked_U16(texaddr + i * 2);
					tmpTexBuf32[i] = clut[GetClutIndex(index)];
				}
				break;

			case 4:
				for (int i = 0; i < length; i++) {
					u32 index = Memory::ReadUnchecked_U32(texaddr + i * 4);
					tmpTexBuf32[i] = clut[GetClutIndex(index)];
				}
				break;
			}
		} else {
			UnswizzleFromMem(texaddr, bytesPerIndex, level);
			switch (bytesPerIndex) {
			case 1:
				for (int i = length - 4, j = (length / 4) - 1; i >= 0; i -= 4, j--) {
					u32 n = tmpTexBuf32[j];
					u32 k;
					for (k = 0; k < 4; k++) {
						u32 index = (n >> (k * 8)) & 0xff;
						tmpTexBuf32[i + k] = clut[GetClutIndex(index)];
					}
				}
				break;

			case 2:
				for (int i = length - 2, j = (length / 2) - 1; i >= 0; i -= 2, j--) {
					u32 n = tmpTexBuf32[j];
					tmpTexBuf32[i + 0] = clut[GetClutIndex(n & 0xffff)];
					tmpTexBuf32[i + 1] = clut[GetClutIndex(n >> 16)];
				}
				break;

			case 4:
				for (int i = 0; i < length; i++) {
					u32 n = tmpTexBuf32[i];
					tmpTexBuf32[i] = clut[GetClutIndex(n)];
				}
				break;
			}
		}
		buf = tmpTexBuf32;
		}
		break;

	default:
		ERROR_LOG(G3D, "Unhandled clut texture mode %d!!!", (gstate.clutformat & 3));
		break;
	}

	return buf;
}

GLenum getClutDestFormat(GEPaletteFormat format) {
	switch (format) {
	case GE_CMODE_16BIT_ABGR4444:
		return GL_UNSIGNED_SHORT_4_4_4_4;
	case GE_CMODE_16BIT_ABGR5551:
		return GL_UNSIGNED_SHORT_5_5_5_1;
	case GE_CMODE_16BIT_BGR5650:
		return GL_UNSIGNED_SHORT_5_6_5;
	case GE_CMODE_32BIT_ABGR8888:
		return GL_UNSIGNED_BYTE;
	}
	return 0;
}

static const u8 texByteAlignMap[] = {2, 2, 2, 4};

static const GLuint MinFiltGL[8] = {
	GL_NEAREST,
	GL_LINEAR,
	GL_NEAREST,
	GL_LINEAR,
	GL_NEAREST_MIPMAP_NEAREST,
	GL_LINEAR_MIPMAP_NEAREST,
	GL_NEAREST_MIPMAP_LINEAR,
	GL_LINEAR_MIPMAP_LINEAR,
};

static const GLuint MagFiltGL[2] = {
	GL_NEAREST,
	GL_LINEAR
};

// OpenGL ES 2.0 workaround. This SHOULD be available but is NOT in the headers in Android.
// Let's see if this hackery works.
#ifndef GL_TEXTURE_LOD_BIAS
#define GL_TEXTURE_LOD_BIAS 0x8501
#endif

#ifndef GL_TEXTURE_MAX_LOD
#define GL_TEXTURE_MAX_LOD 0x813B
#endif

// This should not have to be done per texture! OpenGL is silly yo
// TODO: Dirty-check this against the current texture.
void TextureCache::UpdateSamplingParams(TexCacheEntry &entry, bool force) {
	int minFilt = gstate.texfilter & 0x7;
	int magFilt = (gstate.texfilter>>8) & 1;
	bool sClamp = gstate.texwrap & 1;
	bool tClamp = (gstate.texwrap>>8) & 1;

	if (entry.maxLevel == 0) {
		// Enforce no mip filtering, for safety.
		minFilt &= 1; // no mipmaps yet
	} else {
		// TODO: Is this a signed value? Which direction?
		float lodBias = 0.0; // -(float)((gstate.texlevel >> 16) & 0xFF) / 16.0f;
		if (force || entry.lodBias != lodBias) {
			glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_LOD_BIAS, lodBias);
			entry.lodBias = lodBias;
		}
	}

	if (g_Config.bLinearFiltering) {
		magFilt |= 1;
		minFilt |= 1;
	}

	if (force || entry.minFilt != minFilt) {
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, MinFiltGL[minFilt]);
		entry.minFilt = minFilt;
	}
	if (force || entry.magFilt != magFilt) {
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, MagFiltGL[magFilt]);
		entry.magFilt = magFilt;
	}
	if (force || entry.sClamp != sClamp) {
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, sClamp ? GL_CLAMP_TO_EDGE : GL_REPEAT);
		entry.sClamp = sClamp;
	}
	if (force || entry.tClamp != tClamp) {
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, tClamp ? GL_CLAMP_TO_EDGE : GL_REPEAT);
		entry.tClamp = tClamp;
	}
}

// Todo: Make versions of these that do two pixels at a time within a 32-bit register.

// Convert from PSP bit order to GLES bit order
static inline u16 convert565(u16 c) {
	return (c >> 11) | (c & 0x07E0) | (c << 11);
}

// Convert from PSP bit order to GLES bit order
static inline u16 convert4444(u16 c) {
	return (c >> 12) | ((c >> 4) & 0xF0) | ((c << 4) & 0xF00) | (c << 12);
}

// Convert from PSP bit order to GLES bit order
static inline u16 convert5551(u16 c) {
	return ((c & 0x8000) >> 15) | (c << 1);
}


// All these DXT structs are in the reverse order, as compared to PC.
// On PC, alpha comes before color, and interpolants are before the tile data.

struct DXT1Block {
	u8 lines[4];
	u16 color1;
	u16 color2;
};

struct DXT3Block {
	DXT1Block color;
	u16 alphaLines[4];
};

struct DXT5Block {
	DXT1Block color;
	u32 alphadata2;
	u16 alphadata1;
	u8 alpha1; u8 alpha2;
};

static inline u32 makecol(int r, int g, int b, int a) {
	return (a << 24) | (r << 16) | (g << 8) | b;
}

// This could probably be done faster by decoding two or four blocks at a time with SSE/NEON.
static void decodeDXT1Block(u32 *dst, const DXT1Block *src, int pitch, bool ignore1bitAlpha = false) {
	// S3TC Decoder
	// Needs more speed and debugging.
	u16 c1 = (src->color1);
	u16 c2 = (src->color2);
	int red1 = Convert5To8(c1 & 0x1F);
	int red2 = Convert5To8(c2 & 0x1F);
	int green1 = Convert6To8((c1 >> 5) & 0x3F);
	int green2 = Convert6To8((c2 >> 5) & 0x3F);
	int blue1 = Convert5To8((c1 >> 11) & 0x1F);
	int blue2 = Convert5To8((c2 >> 11) & 0x1F);

	u32 colors[4];
	colors[0] = makecol(red1, green1, blue1, 255);
	colors[1] = makecol(red2, green2, blue2, 255);
	if (c1 > c2 || ignore1bitAlpha) {
		int blue3 = ((blue2 - blue1) >> 1) - ((blue2 - blue1) >> 3);
		int green3 = ((green2 - green1) >> 1) - ((green2 - green1) >> 3);
		int red3 = ((red2 - red1) >> 1) - ((red2 - red1) >> 3);				
		colors[2] = makecol(red1 + red3, green1 + green3, blue1 + blue3, 255);
		colors[3] = makecol(red2 - red3, green2 - green3, blue2 - blue3, 255);
	} else {
		colors[2] = makecol((red1 + red2 + 1) / 2, // Average
			(green1 + green2 + 1) / 2,
			(blue1 + blue2 + 1) / 2, 255);
		colors[3] = makecol(red2, green2, blue2, 0);	// Color2 but transparent
	}

	for (int y = 0; y < 4; y++) {
		int val = src->lines[y];
		for (int x = 0; x < 4; x++) {
			dst[x] = colors[val & 3];
			val >>= 2;
		}
		dst += pitch;
	}
}

static void decodeDXT3Block(u32 *dst, const DXT3Block *src, int pitch)
{
	decodeDXT1Block(dst, &src->color, pitch, true);
	// Alpha: TODO
}

static inline u8 lerp8(const DXT5Block *src, int n) {
	float d = n / 7.0f;
	return (u8)(src->alpha1 + (src->alpha2 - src->alpha1) * d);
}

static inline u8 lerp6(const DXT5Block *src, int n) {
	float d = n / 5.0f;
	return (u8)(src->alpha1 + (src->alpha2 - src->alpha1) * d);
}

// The alpha channel is not 100% correct 
static void decodeDXT5Block(u32 *dst, const DXT5Block *src, int pitch) {
	decodeDXT1Block(dst, &src->color, pitch, true);
	u8 alpha[8];

	alpha[0] = src->alpha1;
	alpha[1] = src->alpha2;
	if (alpha[0] > alpha[1]) {
		alpha[2] = lerp8(src, 6);
		alpha[3] = lerp8(src, 5);
		alpha[4] = lerp8(src, 4);
		alpha[5] = lerp8(src, 3);
		alpha[6] = lerp8(src, 2);
		alpha[7] = lerp8(src, 1);
	} else {
		alpha[2] = lerp6(src, 4);
		alpha[3] = lerp6(src, 3);
		alpha[4] = lerp6(src, 2);
		alpha[5] = lerp6(src, 1);
		alpha[6] = 0;
		alpha[7] = 255;
	}

	u64 data = ((u64)src->alphadata1 << 32) | src->alphadata2;

	for (int y = 0; y < 4; y++) {
		for (int x = 0; x < 4; x++) {
			dst[x] = (dst[x] & 0xFFFFFF) | (alpha[data & 7] << 24);
			data >>= 3;
		}
		dst += pitch;
	}
}

static void convertColors(u8 *finalBuf, GLuint dstFmt, int numPixels) {
	// TODO: All these can be massively sped up with SSE, or even
	// somewhat sped up using "manual simd" in 32 or 64-bit gprs.
	switch (dstFmt) {
	case GL_UNSIGNED_SHORT_4_4_4_4:
		{
			u16 *p = (u16 *)finalBuf;
			for (int i = 0; i < numPixels; i++) {
				u16 c = p[i];
				p[i] = (c >> 12) | ((c >> 4) & 0xF0) | ((c << 4) & 0xF00) | (c << 12);
			}
		}
		break;
	case GL_UNSIGNED_SHORT_5_5_5_1:
		{
			u16 *p = (u16 *)finalBuf;
			for (int i = 0; i < numPixels; i++) {
				u16 c = p[i];
				p[i] = ((c & 0x8000) >> 15) | ((c >> 9) & 0x3E) | ((c << 1) & 0x7C0) | ((c << 11) & 0xF800);
			}
		}
		break;
	case GL_UNSIGNED_SHORT_5_6_5:
		{
			u16 *p = (u16 *)finalBuf;
			for (int i = 0; i < numPixels; i++) {
				u16 c = p[i];
				p[i] = (c >> 11) | (c & 0x07E0) | (c << 11);
			}
		}
		break;
	default:
		{
			// No need to convert RGBA8888, right order already
		}
		break;
	}
}

int lastBoundTexture = -1;

void TextureCache::StartFrame() {
	lastBoundTexture = -1;
	Decimate();
}

static const u8 bitsPerPixel[11] = {
	16,  //GE_TFMT_5650=16,
	16,  //GE_TFMT_5551=16,
	16,  //GE_TFMT_4444=16,
	32,  //GE_TFMT_8888=3,
	4,   //GE_TFMT_CLUT4=4,
	8,   //GE_TFMT_CLUT8=5,
	16,  //GE_TFMT_CLUT16=6,
	32,  //GE_TFMT_CLUT32=7,
	4,   //GE_TFMT_DXT1=4,
	8,   //GE_TFMT_DXT3=8,
	8,   //GE_TFMT_DXT5=8,
};

static const bool formatUsesClut[11] = {
	false,
	false,
	false,
	false,
	true,
	true,
	true,
	true,
	false,
	false,
	false,
};

static inline u32 MiniHash(const u32 *ptr) {
	return ptr[0];
}

static inline u32 QuickTexHash(u32 addr, int bufw, int w, int h, u32 format) {
	int pixToBytes = (bitsPerPixel[format < 11 ? format : 0] + 7) / 8;
	int w32 = (w * pixToBytes + 3) / 4;
	int pad32 = ((bufw * pixToBytes + 3) / 4) - w32;

	const u32 *checkp = (const u32 *) Memory::GetPointer(addr);
	u32 check = 0;
	for (int y = 0; y < h; ++y) {
		for (int x = 0; x < w32; ++x) {
			check += *checkp++;
		}
		checkp += pad32;
	}

	return check;
}

void TextureCache::SetTexture() {
	u32 texaddr = (gstate.texaddr[0] & 0xFFFFF0) | ((gstate.texbufwidth[0]<<8) & 0x0F000000);

	if (!Memory::IsValidAddress(texaddr)) {
		// Bind a null texture and return.
		glBindTexture(GL_TEXTURE_2D, 0);
		return;
	}

	u32 format = gstate.texformat & 0xF;
	if (format >= 11) {
		ERROR_LOG(G3D, "Unknown texture format %i", format);
		format = 0;
	}
	bool hasClut = formatUsesClut[format];

	const u8 *texptr = Memory::GetPointer(texaddr);

	u32 clutformat = gstate.clutformat & 3;
	u32 clutaddr = GetClutAddr(clutformat == GE_CMODE_32BIT_ABGR8888 ? 4 : 2);

	u64 cachekey = texaddr;
	if (formatUsesClut[format])
		cachekey |= (u64)clutaddr << 32;

	int maxLevel = ((gstate.texmode >> 16) & 0x7);

	// Adjust maxLevel to actually present levels..
	for (int i = 0; i <= maxLevel; i++) {
		// If encountering levels pointing to nothing, adjust max level.
		u32 levelTexaddr = (gstate.texaddr[i] & 0xFFFFF0) | ((gstate.texbufwidth[i] << 8) & 0x0F000000);
		if (!Memory::IsValidAddress(levelTexaddr)) {
			maxLevel = i - 1;
			break;
		}
	}

	u32 texhash = MiniHash((const u32 *)Memory::GetPointer(texaddr));

	int w = 1 << (gstate.texsize[0] & 0xf);
	int h = 1 << ((gstate.texsize[0] >> 8) & 0xf);
	int bufw = gstate.texbufwidth[0] & 0x3ff;

	TexCache::iterator iter = cache.find(cachekey);
	TexCacheEntry *entry = NULL;
	if (iter != cache.end()) {
		entry = &iter->second;
		// Check for FBO - slow!
		if (entry->fbo) {
			fbo_bind_color_as_texture(entry->fbo, 0);
			UpdateSamplingParams(*entry, false);

			int fbow, fboh;
			fbo_get_dimensions(entry->fbo, &fbow, &fboh);

			// Almost certain this isn't right.
			gstate_c.curTextureWidth = fbow;
			gstate_c.curTextureHeight = fboh;
			return;
		}

		//Validate the texture here (width, height etc)

		int dim = gstate.texsize[0] & 0xF0F;
		bool match = true;
		bool rehash = entry->status == TexCacheEntry::STATUS_UNRELIABLE;
		
		//TODO: Check more texture parameters, compute real texture hash
		if (dim != entry->dim || entry->hash != texhash || entry->format != format)
			match = false;

		//TODO: Check more clut parameters, compute clut hash
		if (match && (format >= GE_TFMT_CLUT4 && format <= GE_TFMT_CLUT32) &&
			 (entry->clutformat != clutformat ||
				entry->clutaddr != clutaddr ||
				entry->cluthash != Memory::Read_U32(entry->clutaddr))) 
			match = false;

		if (entry->maxLevel != maxLevel)
			match = false;

		if (match) {
			if (entry->lastFrame != gpuStats.numFrames) {
				entry->numFrames++;
			}
			if (entry->framesUntilNextFullHash == 0) {
				// Exponential backoff up to 2048 frames.  Textures are often reused.
				entry->framesUntilNextFullHash = std::min(2048, entry->numFrames);
				rehash = true;
			} else {
				--entry->framesUntilNextFullHash;
			}
		}

		// If it's not huge or has been invalidated many times, recheck the whole texture.
		if (entry->invalidHint > 180 || (entry->invalidHint > 15 && dim <= 0x909)) {
			entry->invalidHint = 0;
			rehash = true;
		}

		if (rehash && entry->status != TexCacheEntry::STATUS_RELIABLE) {
			u32 check = QuickTexHash(texaddr, bufw, w, h, format);
			if (check != entry->fullhash) {
				match = false;
				gpuStats.numTextureInvalidations++;
				entry->status = TexCacheEntry::STATUS_UNRELIABLE;
				entry->numFrames = 0;
			} else if (entry->status == TexCacheEntry::STATUS_UNRELIABLE && entry->numFrames > TexCacheEntry::FRAMES_REGAIN_TRUST) {
				entry->status = TexCacheEntry::STATUS_HASHING;
			}
		}

		if (match) {
			// TODO: Mark the entry reliable if it's been safe for long enough?
			//got one!
			entry->lastFrame = gpuStats.numFrames;
			if (entry->texture != lastBoundTexture) {
				glBindTexture(GL_TEXTURE_2D, entry->texture);
				lastBoundTexture = entry->texture;
			}
			UpdateSamplingParams(*entry, false);
			DEBUG_LOG(G3D, "Texture at %08x Found in Cache, applying", texaddr);
			return; //Done!
		} else {
			INFO_LOG(G3D, "Texture different or overwritten, reloading at %08x", texaddr);
			glDeleteTextures(1, &entry->texture);
			if (entry->status == TexCacheEntry::STATUS_RELIABLE) {
				entry->status = TexCacheEntry::STATUS_HASHING;
			}
		}
	} else {
		INFO_LOG(G3D,"No texture in cache, decoding...");
		TexCacheEntry entryNew = {0};
		cache[cachekey] = entryNew;

		entry = &cache[cachekey];
		entry->status = TexCacheEntry::STATUS_HASHING;
	}

	//we have to decode it
	entry->addr = texaddr;
	entry->hash = texhash;
	entry->format = format;
	entry->lastFrame = gpuStats.numFrames;
	entry->fbo = 0;
	entry->maxLevel = maxLevel;
	entry->lodBias = 0.0f;

	if (format >= GE_TFMT_CLUT4 && format <= GE_TFMT_CLUT32) {
		entry->clutformat = clutformat;
		entry->clutaddr = GetClutAddr(clutformat == GE_CMODE_32BIT_ABGR8888 ? 4 : 2);
		entry->cluthash = Memory::Read_U32(entry->clutaddr);
	} else {
		entry->clutaddr = 0;
	}

	
	entry->dim = gstate.texsize[0] & 0xF0F;

	// This would overestimate the size in many case so we underestimate instead
	// to avoid excessive clearing caused by cache invalidations.
	entry->sizeInRAM = (bitsPerPixel[format < 11 ? format : 0] * bufw * h / 2) / 8;

	entry->fullhash = QuickTexHash(texaddr, bufw, w, h, format);

	gstate_c.curTextureWidth = w;
	gstate_c.curTextureHeight = h;

	glGenTextures(1, &entry->texture);
	glBindTexture(GL_TEXTURE_2D, entry->texture);
	
#ifdef USING_GLES2
	// GLES2 doesn't have support for a "Max lod" which is critical as PSP games often
	// don't specify mips all the way down. As a result, we either need to manually generate
	// the bottom few levels or rely on OpenGL's autogen mipmaps instead, which might not
	// be as good quality as the game's own (might even be better in some cases though).

	// For now, I choose to use autogen mips on GLES2 and the game's own on other platforms.
	// As is usual, GLES3 will solve this problem nicely but wide distribution of that is
	// years away.
	LoadTextureLevel(*entry, 0);
	if (entry->maxLevel > 0)
		glGenerateMipmap(GL_TEXTURE_2D);
#else
	for (int i = 0; i <= entry->maxLevel; i++) {
		LoadTextureLevel(*entry, i);
	}
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, entry->maxLevel);
#endif
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, (float)entry->maxLevel);
	float anisotropyLevel = (float) g_Config.iAnisotropyLevel > maxAnisotropyLevel ? maxAnisotropyLevel : (float) g_Config.iAnisotropyLevel;
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, anisotropyLevel );
	// NOTICE_LOG(G3D,"AnisotropyLevel = %0.1f , MaxAnisotropyLevel = %0.1f ", anisotropyLevel, maxAnisotropyLevel );

	UpdateSamplingParams(*entry, true);

	//glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
	glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
	//glPixelStorei(GL_PACK_ROW_LENGTH, 0);
	glPixelStorei(GL_PACK_ALIGNMENT, 1);
}


void TextureCache::LoadTextureLevel(TexCacheEntry &entry, int level) 
{
	void *finalBuf = NULL;

		// TODO: only do this once
	u32 texByteAlign = 1;

	// TODO: Look into using BGRA for 32-bit textures when the GL_EXT_texture_format_BGRA8888 extension is available, as it's faster than RGBA on some chips.
	GLenum dstFmt = 0;

	// TODO: Actually decode the mipmaps.

	u32 texaddr = (gstate.texaddr[level] & 0xFFFFF0) | ((gstate.texbufwidth[level] << 8) & 0x0F000000);

	int bufw = gstate.texbufwidth[level] & 0x3ff;


	int w = 1 << (gstate.texsize[level] & 0xf);
	int h = 1 << ((gstate.texsize[level] >> 8) & 0xf);
	const u8 *texptr = Memory::GetPointer(texaddr);

	switch (entry.format)
	{
	case GE_TFMT_CLUT4:
		dstFmt = getClutDestFormat((GEPaletteFormat)(entry.clutformat));

		switch (entry.clutformat) {
		case GE_CMODE_16BIT_BGR5650:
		case GE_CMODE_16BIT_ABGR5551:
		case GE_CMODE_16BIT_ABGR4444:
			{
			ReadClut16(clutBuf16);
			const u16 *clut = clutBuf16;
			u32 clutSharingOffset = 0; //(gstate.mipmapShareClut & 1) ? 0 : level * 16;
			texByteAlign = 2;
			if (!(gstate.texmode & 1)) {
				const u8 *addr = Memory::GetPointer(texaddr);
				for (int i = 0; i < bufw * h; i += 2)
				{
					u8 index = *addr++;
					tmpTexBuf16[i + 0] = clut[GetClutIndex((index >> 0) & 0xf) + clutSharingOffset];
					tmpTexBuf16[i + 1] = clut[GetClutIndex((index >> 4) & 0xf) + clutSharingOffset];
				}
			} else {
				UnswizzleFromMem(texaddr, 0, level);
				for (int i = 0, j = 0; i < bufw * h; i += 8, j++)
				{
					u32 n = tmpTexBuf32[j];
					u32 k, index;
					for (k = 0; k < 8; k++) {
						index = (n >> (k * 4)) & 0xf;
						tmpTexBuf16[i + k] = clut[GetClutIndex(index) + clutSharingOffset];
					}
				}
			}
			finalBuf = tmpTexBuf16;
			}
			break;

		case GE_CMODE_32BIT_ABGR8888:
			{
			ReadClut32(clutBuf32);
			const u32 *clut = clutBuf32;
			u32 clutSharingOff = 0;//gstate.mipmapShareClut ? 0 : level * 16;
			if (!(gstate.texmode & 1)) {
				const u8 *addr = Memory::GetPointer(texaddr);
				for (int i = 0; i < bufw * h; i += 2)
				{
					u8 index = *addr++;
					tmpTexBuf32[i + 0] = clut[GetClutIndex((index >> 0) & 0xf) + clutSharingOff];
					tmpTexBuf32[i + 1] = clut[GetClutIndex((index >> 4) & 0xf) + clutSharingOff];
				}
			} else {
				u32 pixels = bufw * h;
				UnswizzleFromMem(texaddr, 0, level);
				for (int i = pixels - 8, j = (pixels / 8) - 1; i >= 0; i -= 8, j--) {
					u32 n = tmpTexBuf32[j];
					for (int k = 0; k < 8; k++) {
						u32 index = (n >> (k * 4)) & 0xf;
						tmpTexBuf32[i + k] = clut[GetClutIndex(index) + clutSharingOff];
					}
				}
			}
			finalBuf = tmpTexBuf32;
			}
			break;

		default:
			ERROR_LOG(G3D, "Unknown CLUT4 texture mode %d", (gstate.clutformat & 3));
			return;
		}
		break;

	case GE_TFMT_CLUT8:
		finalBuf = readIndexedTex(level, texaddr, 1);
		dstFmt = getClutDestFormat((GEPaletteFormat)(gstate.clutformat & 3));
		texByteAlign = texByteAlignMap[(gstate.clutformat & 3)];
		break;

	case GE_TFMT_CLUT16:
		finalBuf = readIndexedTex(level, texaddr, 2);
		dstFmt = getClutDestFormat((GEPaletteFormat)(gstate.clutformat & 3));
		texByteAlign = texByteAlignMap[(gstate.clutformat & 3)];
		break;

	case GE_TFMT_CLUT32:
		finalBuf = readIndexedTex(level, texaddr, 4);
		dstFmt = getClutDestFormat((GEPaletteFormat)(gstate.clutformat & 3));
		texByteAlign = texByteAlignMap[(gstate.clutformat & 3)];
		break;

	case GE_TFMT_4444:
	case GE_TFMT_5551:
	case GE_TFMT_5650:
		if (entry.format == GE_TFMT_4444)
			dstFmt = GL_UNSIGNED_SHORT_4_4_4_4;
		else if (entry.format == GE_TFMT_5551)
			dstFmt = GL_UNSIGNED_SHORT_5_5_5_1;
		else if (entry.format == GE_TFMT_5650)
			dstFmt = GL_UNSIGNED_SHORT_5_6_5;
		texByteAlign = 2;

		if (!(gstate.texmode & 1)) {
			int len = std::max(bufw, w) * h;
			for (int i = 0; i < len; i++)
				tmpTexBuf16[i] = Memory::ReadUnchecked_U16(texaddr + i * 2);
			finalBuf = tmpTexBuf16;
		}
		else
			finalBuf = UnswizzleFromMem(texaddr, 2, level);
		break;

	case GE_TFMT_8888:
		dstFmt = GL_UNSIGNED_BYTE;
		if (!(gstate.texmode & 1)) {
			int len = bufw * h;
			for (int i = 0; i < len; i++)
				tmpTexBuf32[i] = Memory::ReadUnchecked_U32(texaddr + i * 4);
			finalBuf = tmpTexBuf32;
		}
		else
			finalBuf = UnswizzleFromMem(texaddr, 4, level);
		break;

	case GE_TFMT_DXT1:
		dstFmt = GL_UNSIGNED_BYTE;
		{
			u32 *dst = tmpTexBuf32;
			DXT1Block *src = (DXT1Block*)texptr;

			for (int y = 0; y < h; y += 4) {
				u32 blockIndex = (y / 4) * (bufw / 4);
				for (int x = 0; x < std::min(bufw, w); x += 4) {
					decodeDXT1Block(dst + bufw * y + x, src + blockIndex, bufw);
					blockIndex++;
				}
			}
			finalBuf = tmpTexBuf32;
			w = (w + 3) & ~3;
		}
		break;

	case GE_TFMT_DXT3:
		dstFmt = GL_UNSIGNED_BYTE;
		{
			u32 *dst = tmpTexBuf32;
			DXT3Block *src = (DXT3Block*)texptr;

			// Alpha is off
			for (int y = 0; y < h; y += 4) {
				u32 blockIndex = (y / 4) * (bufw / 4);
				for (int x = 0; x < std::min(bufw, w); x += 4) {
					decodeDXT3Block(dst + bufw * y + x, src + blockIndex, bufw);
					blockIndex++;
				}
			}
			w = (w + 3) & ~3;
			finalBuf = tmpTexBuf32;
		}
		break;

	case GE_TFMT_DXT5:
		ERROR_LOG(G3D, "Unhandled compressed texture, format %i! swizzle=%i", entry.format, gstate.texmode & 1);
		dstFmt = GL_UNSIGNED_BYTE;
		{
			u32 *dst = tmpTexBuf32;
			DXT5Block *src = (DXT5Block*)texptr;

			// Alpha is almost right
			for (int y = 0; y < h; y += 4) {
				u32 blockIndex = (y / 4) * (bufw / 4);
				for (int x = 0; x < std::min(bufw, w); x += 4) {
					decodeDXT5Block(dst + bufw * y + x, src + blockIndex, bufw);
					blockIndex++;
				}
			}
			w = (w + 3) & ~3;
			finalBuf = tmpTexBuf32;
		}
		break;

	default:
		ERROR_LOG(G3D, "Unknown Texture Format %d!!!", entry.format);
		finalBuf = tmpTexBuf32;
		return;
	}

	if (!finalBuf) {
		ERROR_LOG(G3D, "NO finalbuf! Will crash!");
	}

	convertColors((u8*)finalBuf, dstFmt, bufw * h);

	if (w != bufw) {
		int pixelSize;
		switch (dstFmt) {
		case GL_UNSIGNED_SHORT_4_4_4_4:
		case GL_UNSIGNED_SHORT_5_5_5_1:
		case GL_UNSIGNED_SHORT_5_6_5:
			pixelSize = 2;
			break;
		default:
			pixelSize = 4;
			break;
		}
		// Need to rearrange the buffer to simulate GL_UNPACK_ROW_LENGTH etc.
		int inRowBytes = bufw * pixelSize;
		int outRowBytes = w * pixelSize;
		const u8 *read = (const u8 *)finalBuf;
		u8 *write = 0;
		if (w > bufw) {
			write = (u8 *)tmpTexBufRearrange;
			finalBuf = tmpTexBufRearrange;
		} else {
			write = (u8 *)finalBuf;
		}
		for (int y = 0; y < h; y++) {
			memmove(write, read, outRowBytes);
			read += inRowBytes;
			write += outRowBytes;
		}
	}

	gpuStats.numTexturesDecoded++;
	// Can restore these and remove the above fixup on some platforms.
	//glPixelStorei(GL_UNPACK_ROW_LENGTH, bufw);
	glPixelStorei(GL_UNPACK_ALIGNMENT, texByteAlign);
	//glPixelStorei(GL_PACK_ROW_LENGTH, bufw);
	glPixelStorei(GL_PACK_ALIGNMENT, texByteAlign);

	// INFO_LOG(G3D, "Creating texture level %i/%i from %08x: %i x %i (stride: %i). fmt: %i", level, entry.maxLevel, texaddr, w, h, bufw, entry.format);

	GLuint components = dstFmt == GL_UNSIGNED_SHORT_5_6_5 ? GL_RGB : GL_RGBA;
	glTexImage2D(GL_TEXTURE_2D, level, components, w, h, 0, components, dstFmt, finalBuf);
}