/*************************************************************************/ /*!
@File
@Title          Global 3D types for use by IMG APIs
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@Description    Defines 3D types for use by IMG APIs
@License        Dual MIT/GPLv2

The contents of this file are subject to the MIT license as set out below.

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not delete the provisions above, a recipient may use your version of this file
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This License is also included in this distribution in the file called
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EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) THE SOFTWARE IS
PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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*/ /**************************************************************************/

#ifndef __IMG_3DTYPES_H__
#define __IMG_3DTYPES_H__

#include <powervr/buffer_attribs.h>
#include "img_types.h"
#include "img_defs.h"

/**
 * Comparison functions
 * This comparison function is defined as:
 * A {CmpFunc} B
 * A is a reference value, e.g., incoming depth etc.
 * B is the sample value, e.g., value in depth buffer.
 */
typedef enum _IMG_COMPFUNC_
{
	IMG_COMPFUNC_NEVER,			/**< The comparison never succeeds */
	IMG_COMPFUNC_LESS,			/**< The comparison is a less-than operation */
	IMG_COMPFUNC_EQUAL,			/**< The comparison is an equal-to operation */
	IMG_COMPFUNC_LESS_EQUAL,	/**< The comparison is a less-than or equal-to
									 operation */
	IMG_COMPFUNC_GREATER,		/**< The comparison is a greater-than operation
								*/
	IMG_COMPFUNC_NOT_EQUAL,		/**< The comparison is a no-equal-to operation
								*/
	IMG_COMPFUNC_GREATER_EQUAL,	/**< The comparison is a greater-than or
									 equal-to operation */
	IMG_COMPFUNC_ALWAYS,		/**< The comparison always succeeds */
} IMG_COMPFUNC;

/**
 * Stencil op functions
 */
typedef enum _IMG_STENCILOP_
{
	IMG_STENCILOP_KEEP,		/**< Keep original value */
	IMG_STENCILOP_ZERO,		/**< Set stencil to 0 */
	IMG_STENCILOP_REPLACE,	/**< Replace stencil entry */
	IMG_STENCILOP_INCR_SAT,	/**< Increment stencil entry, clamping to max */
	IMG_STENCILOP_DECR_SAT,	/**< Decrement stencil entry, clamping to zero */
	IMG_STENCILOP_INVERT,	/**< Invert bits in stencil entry */
	IMG_STENCILOP_INCR,		/**< Increment stencil entry,
								 wrapping if necessary */
	IMG_STENCILOP_DECR,		/**< Decrement stencil entry,
								 wrapping if necessary */
} IMG_STENCILOP;

/**
 * Alpha blending allows colours and textures on one surface
 * to be blended with transparency onto another surface.
 * These definitions apply to both source and destination blending
 * states
 */
typedef enum _IMG_BLEND_
{
	IMG_BLEND_ZERO = 0,        /**< Blend factor is (0,0,0,0) */
	IMG_BLEND_ONE,             /**< Blend factor is (1,1,1,1) */
	IMG_BLEND_SRC_COLOUR,      /**< Blend factor is the source colour */
	IMG_BLEND_INV_SRC_COLOUR,  /**< Blend factor is the inverted source colour
									(i.e. 1-src_col) */
	IMG_BLEND_SRC_ALPHA,       /**< Blend factor is the source alpha */
	IMG_BLEND_INV_SRC_ALPHA,   /**< Blend factor is the inverted source alpha
									(i.e. 1-src_alpha) */
	IMG_BLEND_DEST_ALPHA,      /**< Blend factor is the destination alpha */
	IMG_BLEND_INV_DEST_ALPHA,  /**< Blend factor is the inverted destination
									alpha */
	IMG_BLEND_DEST_COLOUR,     /**< Blend factor is the destination colour */
	IMG_BLEND_INV_DEST_COLOUR, /**< Blend factor is the inverted destination
									colour */
	IMG_BLEND_SRC_ALPHASAT,    /**< Blend factor is the alpha saturation (the
									minimum of (Src alpha,
									1 - destination alpha)) */
	IMG_BLEND_BLEND_FACTOR,    /**< Blend factor is a constant */
	IMG_BLEND_INVBLEND_FACTOR, /**< Blend factor is a constant (inverted)*/
	IMG_BLEND_SRC1_COLOUR,     /**< Blend factor is the colour outputted from
									the pixel shader */
	IMG_BLEND_INV_SRC1_COLOUR, /**< Blend factor is the inverted colour
									outputted from the pixel shader */
	IMG_BLEND_SRC1_ALPHA,      /**< Blend factor is the alpha outputted from
									the pixel shader */
	IMG_BLEND_INV_SRC1_ALPHA   /**< Blend factor is the inverted alpha
									outputted from the pixel shader */
} IMG_BLEND;

/**
 * The arithmetic operation to perform when blending
 */
typedef enum _IMG_BLENDOP_
{
	IMG_BLENDOP_ADD = 0,      /**< Result = (Source + Destination) */
	IMG_BLENDOP_SUBTRACT,     /**< Result = (Source - Destination) */
	IMG_BLENDOP_REV_SUBTRACT, /**< Result = (Destination - Source) */
	IMG_BLENDOP_MIN,          /**< Result = min (Source, Destination) */
	IMG_BLENDOP_MAX           /**< Result = max (Source, Destination) */
} IMG_BLENDOP;

/**
 * Logical operation to perform when logic ops are enabled
 */
typedef enum _IMG_LOGICOP_
{
	IMG_LOGICOP_CLEAR = 0,     /**< Result = 0 */
	IMG_LOGICOP_SET,           /**< Result = -1 */
	IMG_LOGICOP_COPY,          /**< Result = Source */
	IMG_LOGICOP_COPY_INVERTED, /**< Result = ~Source */
	IMG_LOGICOP_NOOP,          /**< Result = Destination */
	IMG_LOGICOP_INVERT,        /**< Result = ~Destination */
	IMG_LOGICOP_AND,           /**< Result = Source & Destination */
	IMG_LOGICOP_NAND,          /**< Result = ~(Source & Destination) */
	IMG_LOGICOP_OR,            /**< Result = Source | Destination */
	IMG_LOGICOP_NOR,           /**< Result = ~(Source | Destination) */
	IMG_LOGICOP_XOR,           /**< Result = Source ^ Destination */
	IMG_LOGICOP_EQUIV,         /**< Result = ~(Source ^ Destination) */
	IMG_LOGICOP_AND_REVERSE,   /**< Result = Source & ~Destination */
	IMG_LOGICOP_AND_INVERTED,  /**< Result = ~Source & Destination */
	IMG_LOGICOP_OR_REVERSE,    /**< Result = Source | ~Destination */
	IMG_LOGICOP_OR_INVERTED    /**< Result = ~Source | Destination */
} IMG_LOGICOP;

/**
 * Type of fog blending supported
 */
typedef enum _IMG_FOGMODE_
{
	IMG_FOGMODE_NONE, /**< No fog blending - fog calculations are
					   *   based on the value output from the vertex phase */
	IMG_FOGMODE_LINEAR, /**< Linear interpolation */
	IMG_FOGMODE_EXP, /**< Exponential */
	IMG_FOGMODE_EXP2, /**< Exponential squaring */
} IMG_FOGMODE;

/**
 * Types of filtering
 */
typedef enum _IMG_FILTER_
{
	IMG_FILTER_DONTCARE,	/**< Any filtering mode is acceptable */
	IMG_FILTER_POINT,		/**< Point filtering */
	IMG_FILTER_LINEAR,		/**< Bi-linear filtering */
	IMG_FILTER_BICUBIC,		/**< Bi-cubic filtering */
} IMG_FILTER;

/**
 * Addressing modes for textures
 */
typedef enum _IMG_ADDRESSMODE_
{
	IMG_ADDRESSMODE_REPEAT,	/**< Texture repeats continuously */
	IMG_ADDRESSMODE_FLIP, /**< Texture flips on odd integer part */
	IMG_ADDRESSMODE_CLAMP, /**< Texture clamped at 0 or 1 */
	IMG_ADDRESSMODE_FLIPCLAMP, /**< Flipped once, then clamp */
	IMG_ADDRESSMODE_CLAMPBORDER,
	IMG_ADDRESSMODE_OGL_CLAMP,
	IMG_ADDRESSMODE_OVG_TILEFILL,
	IMG_ADDRESSMODE_DONTCARE,
} IMG_ADDRESSMODE;

/**
 * Culling based on winding order of triangle.
 */
typedef enum _IMG_CULLMODE_
{
	IMG_CULLMODE_NONE,			/**< Don't cull */
	IMG_CULLMODE_FRONTFACING,	/**< Front facing triangles */
	IMG_CULLMODE_BACKFACING,	/**< Back facing triangles */
} IMG_CULLMODE;

/**
  Colour for clearing surfaces.
  The four elements of the 4 x 32 bit array will map to colour
  R,G,B,A components, in order.
  For YUV colour space the order is Y,U,V.
  For Depth and Stencil formats D maps to R and S maps to G.
*/
typedef union _IMG_CLEAR_COLOUR_ {
	IMG_UINT32        aui32[4];
	IMG_INT32         ai32[4];
	IMG_FLOAT         af32[4];
} IMG_CLEAR_COLOUR;

static_assert(sizeof(IMG_FLOAT) == sizeof(IMG_INT32), "Size of IMG_FLOAT is not 32 bits.");

/*! ************************************************************************//**
@brief          Specifies the MSAA resolve operation.
*/ /**************************************************************************/
typedef enum _IMG_RESOLVE_OP_
{
	IMG_RESOLVE_BLEND   = 0,          /*!< box filter on the samples */
	IMG_RESOLVE_MIN     = 1,          /*!< minimum of the samples */
	IMG_RESOLVE_MAX     = 2,          /*!< maximum of the samples */
	IMG_RESOLVE_SAMPLE0 = 3,          /*!< choose sample 0 */
	IMG_RESOLVE_SAMPLE1 = 4,          /*!< choose sample 1 */
	IMG_RESOLVE_SAMPLE2 = 5,          /*!< choose sample 2 */
	IMG_RESOLVE_SAMPLE3 = 6,          /*!< choose sample 3 */
	IMG_RESOLVE_SAMPLE4 = 7,          /*!< choose sample 4 */
	IMG_RESOLVE_SAMPLE5 = 8,          /*!< choose sample 5 */
	IMG_RESOLVE_SAMPLE6 = 9,          /*!< choose sample 6 */
	IMG_RESOLVE_SAMPLE7 = 10,         /*!< choose sample 7 */
} IMG_RESOLVE_OP;


#endif /* __IMG_3DTYPES_H__ */
/******************************************************************************
 End of file (img_3dtypes.h)
******************************************************************************/