// Copyright (c) 2013- 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 "Core/Config.h"
#include "GPU/Common/GPUStateUtils.h"
#include "GPU/Common/TextureCacheCommon.h"
#include "GPU/GPUState.h"

// Ugly.
extern int g_iNumVideos;

TextureCacheCommon::~TextureCacheCommon() {}

bool TextureCacheCommon::SetOffsetTexture(u32 offset) {
	return false;
}

void TextureCacheCommon::GetSamplingParams(int &minFilt, int &magFilt, bool &sClamp, bool &tClamp, float &lodBias, u8 maxLevel) {
	minFilt = gstate.texfilter & 0x7;
	magFilt = (gstate.texfilter>>8) & 1;
	sClamp = gstate.isTexCoordClampedS();
	tClamp = gstate.isTexCoordClampedT();

	bool noMip = (gstate.texlevel & 0xFFFFFF) == 0x000001 || (gstate.texlevel & 0xFFFFFF) == 0x100001 ;  // Fix texlevel at 0

	if (maxLevel == 0) {
		// Enforce no mip filtering, for safety.
		minFilt &= 1; // no mipmaps yet
		lodBias = 0.0f;
	} else {
		// Texture lod bias should be signed.
		lodBias = (float)(int)(s8)((gstate.texlevel >> 16) & 0xFF) / 16.0f;
	}

	if (g_Config.iTexFiltering == TEX_FILTER_LINEAR_VIDEO && g_iNumVideos > 0 && (gstate.getTextureDimension(0) & 0xF) >= 9) {
		magFilt |= 1;
		minFilt |= 1;
	}
	if (g_Config.iTexFiltering == TEX_FILTER_LINEAR && (!gstate.isColorTestEnabled() || IsColorTestTriviallyTrue())) {
		if (!gstate.isAlphaTestEnabled() || IsAlphaTestTriviallyTrue()) {
			magFilt |= 1;
			minFilt |= 1;
		}
	}
	bool forceNearest = g_Config.iTexFiltering == TEX_FILTER_NEAREST;
	// Force Nearest when color test enabled and rendering resolution greater than 480x272
	if ((gstate.isColorTestEnabled() && !IsColorTestTriviallyTrue()) && g_Config.iInternalResolution != 1 && gstate.isModeThrough()) {
		// Some games use 0 as the color test color, which won't be too bad if it bleeds.
		// Fuchsia and green, etc. are the problem colors.
		if (gstate.getColorTestRef() != 0) {
			forceNearest = true;
		}
	}
	if (forceNearest) {
		magFilt &= ~1;
		minFilt &= ~1;
	}

	if (!g_Config.bMipMap || noMip) {
		minFilt &= 1;
	}
}