cnq3/code/renderer/grp_uber_shaders.h

/*
===========================================================================
Copyright (C) 2023 Gian 'myT' Schellenbaum

This file is part of Challenge Quake 3 (CNQ3).

Challenge Quake 3 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; either version 2 of the License,
or (at your option) any later version.

Challenge Quake 3 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 for more details.

You should have received a copy of the GNU General Public License
along with Challenge Quake 3. If not, see <https://www.gnu.org/licenses/>.
===========================================================================
*/
// Gameplay Rendering Pipeline - defines all pre-compiled uber pixel shader combinations


#pragma once


// format: stage_count global_state (stage_state_in_hex)+
#define UBER_SHADER_PS_LIST(PS) \
	PS(1_0_0) \
	PS(1_0_13) \
	PS(1_0_22) \
	PS(1_0_23) \
	PS(1_0_25) \
	PS(1_0_40000000) \
	PS(1_0_40000022) \
	PS(1_0_40000065) \
	PS(1_0_41) \
	PS(1_0_62) \
	PS(1_0_65) \
	PS(1_0_83) \
	PS(1_1_0) \
	PS(1_1_13) \
	PS(1_1_22) \
	PS(1_1_23) \
	PS(1_1_25) \
	PS(1_1_40000000) \
	PS(1_1_40000022) \
	PS(1_1_40000065) \
	PS(1_1_41) \
	PS(1_1_62) \
	PS(1_1_65) \
	PS(1_1_83) \
	PS(1_2_22) \
	PS(1_2_25) \
	PS(1_2_62) \
	PS(1_2_65) \
	PS(1_3_22) \
	PS(1_3_25) \
	PS(1_3_62) \
	PS(1_3_65) \
	PS(2_0_0_13) \
	PS(2_0_0_20000000) \
	PS(2_0_0_22) \
	PS(2_0_0_23) \
	PS(2_0_0_53) \
	PS(2_0_0_62) \
	PS(2_0_0_65) \
	PS(2_0_0_78) \
	PS(2_0_0_83) \
	PS(2_0_13_13) \
	PS(2_0_22_22) \
	PS(2_0_40000000_13) \
	PS(2_1_0_13) \
	PS(2_1_0_20000000) \
	PS(2_1_0_22) \
	PS(2_1_0_23) \
	PS(2_1_0_53) \
	PS(2_1_0_62) \
	PS(2_1_0_65) \
	PS(2_1_0_78) \
	PS(2_1_0_83) \
	PS(2_1_13_13) \
	PS(2_1_22_22) \
	PS(2_1_40000000_13) \
	PS(2_2_13_13) \
	PS(2_2_22_22) \
	PS(2_3_13_13) \
	PS(2_3_22_22) \
	PS(3_0_0_0_22) \
	PS(3_0_0_0_65) \
	PS(3_0_0_13_22) \
	PS(3_0_0_13_61) \
	PS(3_0_0_22_13) \
	PS(3_0_0_22_22) \
	PS(3_0_0_22_62) \
	PS(3_0_0_22_65) \
	PS(3_0_0_23_23) \
	PS(3_0_0_40000065_13) \
	PS(3_0_0_56_13) \
	PS(3_0_0_62_13) \
	PS(3_0_0_64_13) \
	PS(3_0_0_65_13) \
	PS(3_0_0_65_22) \
	PS(3_0_0_65_83) \
	PS(3_0_0_83_13) \
	PS(3_0_22_22_22) \
	PS(3_1_0_0_22) \
	PS(3_1_0_0_65) \
	PS(3_1_0_13_22) \
	PS(3_1_0_13_61) \
	PS(3_1_0_22_13) \
	PS(3_1_0_22_22) \
	PS(3_1_0_22_62) \
	PS(3_1_0_22_65) \
	PS(3_1_0_23_23) \
	PS(3_1_0_40000065_13) \
	PS(3_1_0_56_13) \
	PS(3_1_0_62_13) \
	PS(3_1_0_64_13) \
	PS(3_1_0_65_13) \
	PS(3_1_0_65_22) \
	PS(3_1_0_65_83) \
	PS(3_1_0_83_13) \
	PS(3_1_22_22_22) \
	PS(3_2_22_22_22) \
	PS(3_3_22_22_22) \
	PS(4_0_0_0_40000062_83) \
	PS(4_0_0_13_22_22) \
	PS(4_0_0_13_65_65) \
	PS(4_0_0_22_22_13) \
	PS(4_0_0_22_65_13) \
	PS(4_0_0_22_65_83) \
	PS(4_0_0_51_52_13) \
	PS(4_0_0_53_22_13) \
	PS(4_0_0_56_13_22) \
	PS(4_0_0_56_56_13) \
	PS(4_0_0_62_13_22) \
	PS(4_0_0_65_13_22) \
	PS(4_0_0_65_22_62) \
	PS(4_0_0_65_65_22) \
	PS(4_0_0_65_65_83) \
	PS(4_0_22_22_22_22) \
	PS(4_0_25_25_25_25) \
	PS(4_0_40000000_65_13_13) \
	PS(4_1_0_0_40000062_83) \
	PS(4_1_0_13_22_22) \
	PS(4_1_0_13_65_65) \
	PS(4_1_0_22_22_13) \
	PS(4_1_0_22_65_13) \
	PS(4_1_0_22_65_83) \
	PS(4_1_0_51_52_13) \
	PS(4_1_0_53_22_13) \
	PS(4_1_0_56_13_22) \
	PS(4_1_0_56_56_13) \
	PS(4_1_0_62_13_22) \
	PS(4_1_0_65_13_22) \
	PS(4_1_0_65_22_62) \
	PS(4_1_0_65_65_22) \
	PS(4_1_0_65_65_83) \
	PS(4_1_22_22_22_22) \
	PS(4_1_25_25_25_25) \
	PS(4_1_40000000_65_13_13) \
	PS(4_2_25_25_25_25) \
	PS(4_3_25_25_25_25) \
	PS(5_0_0_13_22_22_22) \
	PS(5_0_0_22_22_13_22) \
	PS(5_0_0_22_22_22_40000065) \
	PS(5_0_0_22_22_65_83) \
	PS(5_0_0_22_23_65_83) \
	PS(5_0_0_22_65_83_22) \
	PS(5_0_0_65_13_22_22) \
	PS(5_0_0_65_13_22_25) \
	PS(5_0_22_22_22_22_22) \
	PS(5_1_0_13_22_22_22) \
	PS(5_1_0_22_22_13_22) \
	PS(5_1_0_22_22_22_40000065) \
	PS(5_1_0_22_22_65_83) \
	PS(5_1_0_22_23_65_83) \
	PS(5_1_0_22_65_83_22) \
	PS(5_1_0_65_13_22_22) \
	PS(5_1_0_65_13_22_25) \
	PS(5_1_22_22_22_22_22) \
	PS(5_2_22_22_22_22_22) \
	PS(5_3_22_22_22_22_22) \
	PS(6_0_0_22_22_22_65_13) \
	PS(6_1_0_22_22_22_65_13)

struct UberPixelShaderState
{
	int stageStates[8] = {};
	int stageCount = 0;
	int globalState = 0; // bit mask of UBERPS_*_BIT macros
};

#define UBERPS_DITHER_BIT    1
#define UBERPS_DEPTHFADE_BIT 2

static bool ParseUberPixelShaderState(UberPixelShaderState& state, const char* stateString)
{
	const char* scanStrings[8] =
	{
		"%X_%X",
		"%X_%X_%X",
		"%X_%X_%X_%X",
		"%X_%X_%X_%X_%X",
		"%X_%X_%X_%X_%X_%X",
		"%X_%X_%X_%X_%X_%X_%X",
		"%X_%X_%X_%X_%X_%X_%X_%X",
		"%X_%X_%X_%X_%X_%X_%X_%X_%X"
	};

	if(sscanf(stateString, "%d", &state.stageCount) != 1 ||
		state.stageCount < 1 ||
		state.stageCount > 8)
	{
		return false;
	}

	stateString += 2;
	const char* scanString = scanStrings[state.stageCount - 1];

	if(sscanf(stateString, scanString,
		&state.globalState,
		&state.stageStates[0], &state.stageStates[1],
		&state.stageStates[2], &state.stageStates[3],
		&state.stageStates[4], &state.stageStates[5],
		&state.stageStates[6], &state.stageStates[7]) != state.stageCount + 1)
	{
		return false;
	}

	return true;
}