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/**
******************************************************************************
* This file is part of the TouchGFX 4.10.0 distribution.
*
* <h2><center>© Copyright (c) 2018 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under Ultimate Liberty license
* SLA0044, the "License"; You may not use this file except in compliance with
* the License. You may obtain a copy of the License at:
* www.st.com/SLA0044
*
******************************************************************************
*/
#ifndef TEXTUREMAPTYPES_HPP
#define TEXTUREMAPTYPES_HPP
#include <touchgfx/hal/Types.hpp>
namespace touchgfx
{
/**
* @struct Gradients TextureMapTypes.hpp touchgfx/TextureMapTypes.hpp
*
* @brief Gradients contains all the data to interpolate u,v texture coordinates and z coordinates
* across a planar surface.
*/
struct Gradients
{
/**
* @fn Gradients(const Point3D* vertices);
*
* @brief Constructor. Construct the gradients using 3 3D vertices.
*
* @param vertices The vertices.
*
* @see Point3D
*/
Gradients(const Point3D* vertices);
float oneOverZ[3]; ///< 1/z for each vertex
float UOverZ[3]; ///< u/z for each vertex
float VOverZ[3]; ///< v/z for each vertex
float dOneOverZdX; ///< d(1/z)/dX
float dOneOverZdY; ///< d(1/z)/dY
float dUOverZdX; ///< d(u/z)/dX
float dUOverZdY; ///< d(u/z)/dY
float dVOverZdX; ///< d(v/z)/dX
float dVOverZdY; ///< d(v/z)/dY
fixed16_16 dUdXModifier; ///< The dUdX x coordinate modifier
fixed16_16 dVdXModifier; ///< The dVdX x coordinate modifier
};
/**
* @struct Edge TextureMapTypes.hpp touchgfx/TextureMapTypes.hpp
*
* @brief An edge contains information about one edge, between two points, of a triangle, as well
* as information about how to interpolate values when moving in the vertical direction.
*/
struct Edge
{
/**
* @fn Edge(const Gradients& gradients, const Point3D* vertices, int top, int bottom);
*
* @brief Constructor.
*
* Construct the edge between two vertices and using the gradients for calculating
* the interpolation values.
*
* @param gradients The gradients for the triangle.
* @param vertices The vertices for the triangle.
* @param top The index in the vertices array of the top vertex of this edge.
* @param bottom The index in the vertices array of the bottom vertex of this edge.
*/
Edge(const Gradients& gradients, const Point3D* vertices, int top, int bottom);
/**
* @fn inline int step()
*
* @brief Perform a step along the edge.
*
* Perform a step along the edge.
*
* @return the Height.
*/
inline int step()
{
X += XStep;
Y++;
height--;
UOverZ += UOverZStep;
VOverZ += VOverZStep;
oneOverZ += oneOverZStep;
errorTerm += numerator;
if (errorTerm >= denominator)
{
X++;
errorTerm -= denominator;
oneOverZ += oneOverZStepExtra;
UOverZ += UOverZStepExtra;
VOverZ += VOverZStepExtra;
}
return height;
}
/**
* @fn inline int step(int steps)
*
* @brief Performs a number of steps along the edge.
*
* Performs a number of steps along the edge.
*
* @param steps The number of steps the perform.
*
* @return height.
*/
inline int step(int steps)
{
for (int i = 0; i < steps; i++)
{
step();
}
return height;
}
int32_t X; ///< The X coordinate
int32_t XStep; ///< Amount to increment x
int32_t numerator; ///< The numerator
int32_t denominator; ///< The denominator
int32_t errorTerm; ///< The error term
int Y; ///< The Y coordinate
int height; ///< The height
float oneOverZ; ///< The one over z coordinate
float oneOverZStep; ///< The one over z coordinate step
float oneOverZStepExtra; ///< The one over z coordinate step extra
float UOverZ; ///< The over z coordinate
float UOverZStep; ///< The over z coordinate step
float UOverZStepExtra; ///< The over z coordinate step extra
float VOverZ; ///< The over z coordinate
float VOverZStep; ///< The over z coordinate step
float VOverZStepExtra; ///< The over z coordinate step extra
};
/**
* @fn inline float fixed28_4ToFloat(fixed28_4 value)
*
* @brief Fixed 28 4 to float.
*
* @param value The value.
*
* @return The value as float.
*/
inline float fixed28_4ToFloat(fixed28_4 value)
{
return value / 16.0f;
}
/**
* @fn inline fixed28_4 floatToFixed28_4(float value)
*
* @brief Float to fixed 28 4.
*
* @param value The value.
*
* @return The value as fixed28_4.
*/
inline fixed28_4 floatToFixed28_4(float value)
{
return (fixed28_4)(value * 16);
}
/**
* @fn inline fixed16_16 floatToFixed16_16(float value)
*
* @brief Float to fixed 16.
*
* @param value The value.
*
* @return The value as fixed16_16.
*/
inline fixed16_16 floatToFixed16_16(float value)
{
return (fixed16_16)(value * 65536);
}
/**
* @fn inline fixed28_4 fixed28_4Mul(fixed28_4 a, fixed28_4 b)
*
* @brief Fixed 28 4 mul.
*
* @param a The fixed28_4 to process.
* @param b The fixed28_4 to process.
*
* @return the result.
*/
inline fixed28_4 fixed28_4Mul(fixed28_4 a, fixed28_4 b)
{
if (a == 0 || b == 0)
{
return 0;
}
if ((a * b) / b == a)
{
return (a * b) / 16;
}
// Rewrite "b = max_b * num_max_b + rem_b" so that a * max_b does not overflow.
int sign = 1;
if (b < 0)
{
sign = -sign;
b = -b;
}
if (a < 0)
{
sign = -sign;
a = -a;
}
if (a < b)
{
fixed28_4 tmp = a;
a = b;
b = tmp;
}
int32_t max_b = 0x7FFFFFFF / a; // Max b value that can be multiplied with a without overflow
int32_t num_max_b = b / max_b; // How many times do we have to multiply with "max_b" to get to "b"
int32_t rem_b = b - max_b * num_max_b; // plus some remainder.
int32_t max_prod = a * max_b;
int32_t result = sign * (num_max_b * (max_prod / 16) + (num_max_b * (max_prod % 16) + rem_b * a) / 16);
return result;
}
/**
* @fn inline int32_t ceil28_4(fixed28_4 value)
*
* @brief Ceiling 28 4.
*
* @param value The value.
*
* @return The ceil result.
*/
inline int32_t ceil28_4(fixed28_4 value)
{
int32_t returnValue;
int32_t numerator = value - 1 + 16;
if (numerator >= 0)
{
returnValue = numerator / 16;
}
else
{
// deal with negative numerators correctly
returnValue = -((-numerator) / 16);
returnValue -= ((-numerator) % 16) ? 1 : 0;
}
return returnValue;
}
/**
* @fn inline void floorDivMod(int32_t numerator, int32_t denominator, int32_t& floor, int32_t& mod)
*
* @brief Floor div modifier.
*
* @param numerator The numerator.
* @param denominator The denominator.
* @param [in,out] floor The floor.
* @param [in,out] mod The modifier.
*/
inline void floorDivMod(int32_t numerator, int32_t denominator, int32_t& floor, int32_t& mod)
{
assert(denominator > 0); // we assume it's positive
if (numerator >= 0)
{
// positive case, C is okay
floor = numerator / denominator;
mod = numerator % denominator;
}
else
{
// Numerator is negative, do the right thing
floor = -((-numerator) / denominator);
mod = (-numerator) % denominator;
if (mod)
{
// there is a remainder
floor--;
mod = denominator - mod;
}
}
}
} //namespace touchgfx
#endif // TEXTUREMAPTYPES_HPP