gzdoom/tools/drawergen/fixedfunction/drawspancodegen.h

/*
**  DrawSpan code generation
**  Copyright (c) 2016 Magnus Norddahl
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
*/

#pragma once

#include "drawercodegen.h"

enum class DrawSpanVariant
{
	Opaque,
	Masked,
	Translucent,
	MaskedTranslucent,
	AddClamp,
	MaskedAddClamp
};

class DrawSpanCodegen : public DrawerCodegen
{
public:
	void Generate(DrawSpanVariant variant, SSAValue args);

private:
	void LoopShade(DrawSpanVariant variant, bool isSimpleShade);
	void LoopFilter(DrawSpanVariant variant, bool isSimpleShade, bool isNearestFilter);
	SSAInt Loop4x(DrawSpanVariant variant, bool isSimpleShade, bool isNearestFilter, bool is64x64);
	void Loop(SSAInt start, DrawSpanVariant variant, bool isSimpleShade, bool isNearestFilter, bool is64x64);
	SSAVec4i Sample(SSAInt xfrac, SSAInt yfrac, bool isNearestFilter, bool is64x64);
	SSAVec4i SampleLinear(SSAUBytePtr texture, SSAInt xfrac, SSAInt yfrac, SSAInt xbits, SSAInt ybits);
	SSAVec4i Shade(SSAVec4i fg, bool isSimpleShade);
	SSAVec4i Blend(SSAVec4i fg, SSAVec4i bg, DrawSpanVariant variant);

	SSAStack<SSAInt> stack_index, stack_xfrac, stack_yfrac, stack_light_index;
	SSAStack<SSAVec4i> stack_lit_color;
	SSAStack<SSAFloat> stack_viewpos_x;

	SSAUBytePtr destorg;
	SSAUBytePtr source;
	SSAInt destpitch;
	SSAInt xstep;
	SSAInt ystep;
	SSAInt x1;
	SSAInt x2;
	SSAInt y;
	SSAInt xbits;
	SSAInt ybits;
	SSAInt light;
	SSAInt srcalpha;
	SSAInt destalpha;
	SSAInt count;
	SSAUBytePtr data;
	SSAInt yshift;
	SSAInt xshift;
	SSAInt xmask;
	SSABool is_64x64;
	SSABool is_simple_shade;
	SSABool is_nearest_filter;
	SSAShadeConstants shade_constants;

	SSAFloat start_viewpos_x, step_viewpos_x;
	SSAValue dynlights; // TriLight*
	SSAInt num_dynlights;
	SSAFloat viewpos_x;
};