ppsspp/GPU/Common/GPUStateUtils.h

#pragma once

#include "GPU/ge_constants.h"

enum StencilValueType {
	STENCIL_VALUE_UNIFORM,
	STENCIL_VALUE_ZERO,
	STENCIL_VALUE_ONE,
	STENCIL_VALUE_KEEP,
	STENCIL_VALUE_INVERT,
	STENCIL_VALUE_INCR_4,
	STENCIL_VALUE_INCR_8,
	STENCIL_VALUE_DECR_4,
	STENCIL_VALUE_DECR_8,
};

enum ReplaceAlphaType {
	REPLACE_ALPHA_NO = 0,
	REPLACE_ALPHA_YES = 1,
	REPLACE_ALPHA_DUALSOURCE = 2,
};

enum ReplaceBlendType {
	REPLACE_BLEND_NO,
	REPLACE_BLEND_STANDARD,
	REPLACE_BLEND_PRE_SRC,
	REPLACE_BLEND_PRE_SRC_2X_ALPHA,
	REPLACE_BLEND_2X_ALPHA,
	REPLACE_BLEND_2X_SRC,
	REPLACE_BLEND_COPY_FBO,
};

enum LogicOpReplaceType {
	LOGICOPTYPE_NORMAL,
	LOGICOPTYPE_ONE,
	LOGICOPTYPE_INVERT,
};

bool IsAlphaTestTriviallyTrue();
bool IsColorTestAgainstZero();
bool IsColorTestTriviallyTrue();
bool IsAlphaTestAgainstZero();

StencilValueType ReplaceAlphaWithStencilType();
ReplaceAlphaType ReplaceAlphaWithStencil(ReplaceBlendType replaceBlend);
ReplaceBlendType ReplaceBlendWithShader(bool allowShaderBlend, GEBufferFormat bufferFormat);

bool CanUseHardwareTransform(int prim);
LogicOpReplaceType ReplaceLogicOpType();


// Common representation, should be able to set this directly with any modern API.
struct ViewportAndScissor {
	bool scissorEnable;
	int scissorX;
	int scissorY;
	int scissorW;
	int scissorH;
	float viewportX;
	float viewportY;
	float viewportW;
	float viewportH;
	float depthRangeMin;
	float depthRangeMax;
	bool dirtyProj;
};
void ConvertViewportAndScissor(bool useBufferedRendering, float renderWidth, float renderHeight, int bufferWidth, int bufferHeight, ViewportAndScissor &out);