Warzone 2100 Forums

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	dotProduct = glm::dot(normalise(finalVector), theSun_ForTileIllumination);

	val = abs(dotProduct) / 16;
	if (val == 0)
	{
		val = 1;
	}
	if (val > 254)  // unnecessary calculation   // 231 line
	{
		val = 254;
	}
	mapTile(tileX, tileY)->illumination = val;
}

static void colourTile(SDWORD xIndex, SDWORD yIndex, PIELIGHT light_colour, double fraction)
{
	PIELIGHT colour = getTileColour(xIndex, yIndex);

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	if (val == 0)
	{
		val = 1;
	}
	else if (val > 254)  // 231 line
	{
		val = 254;
	}

Code: Select all

static void calcTileIllum(UDWORD tileX, UDWORD tileY)
{
	/* The number or normals that we got is in numNormals*/
	Vector3f finalVector(0.0f, 0.0f, 0.0f);

	unsigned int numNormals = 0; // How many normals have we got?
	Vector3f normals[8]; // Maximum 8 possible normals

	/* Quadrants look like:-

				  *
				  *
			0	  *    1
				  *
				  *
		**********V**********
				  *
				  *
			3	  *	   2
				  *
				  *
	*/

	/* Do quadrant 0 - tile that's above and left*/
	normalsOnTile(tileX - 1, tileY - 1, 0, &numNormals, normals);

	/* Do quadrant 1 - tile that's above and right*/
	normalsOnTile(tileX, tileY - 1, 1, &numNormals, normals);

	/* Do quadrant 2 - tile that's down and right*/
	normalsOnTile(tileX, tileY, 2, &numNormals, normals);

	/* Do quadrant 3 - tile that's down and left*/
	normalsOnTile(tileX - 1, tileY, 3, &numNormals, normals);

	for (unsigned int i = 0; i < numNormals; i++)
	{
		finalVector = finalVector + normals[i];
	}
	/*   // same old code
	int dotProduct = 0;
	unsigned int val = 0;
	dotProduct = glm::dot(normalise(finalVector), theSun_ForTileIllumination);
	val = abs(dotProduct) / 16;
	*/
	unsigned int val = abs((int)glm::dot(normalise(finalVector), theSun_ForTileIllumination)) >> 4;

	if (val == 0)
	{
		val = 1;
	}
	else if (val > 254)
	{
		val = 254;
	}
	mapTile(tileX, tileY)->illumination = val;
}

Code: Select all

float Q_rsqrt( float number )
{
  long i;
  float x2, y;
  const float threehalfs = 1.5F;

  x2 = number * 0.5F;
  y  = number;
  i  = * ( long * ) &y;
  i  = 0x5f3759df - ( i >> 1 );
  y  = * ( float * ) &i;
  y  = y * ( threehalfs - ( x2 * y * y ) );

  #ifndef Q3_VM
  #ifdef __linux__
    assert( !isnan(y) );
  #endif
  #endif
  return y;
}

Code: Select all

#include <iostream>
#include <Windows.h>
using namespace std;

float Q_rsqrt(float number)
{
	long i;
	float x2, y;
	const float threehalfs = 1.5F;

	x2 = number * 0.5F;
	y = number;
	i = *(long *)&y;
	i = 0x5f3759df - (i >> 1);
	y = *(float *)&i;
	y = y * (threehalfs - (x2 * y * y));

#ifndef Q3_VM
#ifdef __linux__
	assert(!isnan(y));
#endif
#endif
	return y;
}

int main()
{
	float a;
	float t = 10.0f;

	LARGE_INTEGER tsc;
	__asm
	{
		cpuid
		rdtsc
		mov tsc.LowPart, eax
		mov tsc.HighPart, edx
	}

	for (int x = 0; x < 1000000000; x++)
	{
		a = Q_rsqrt(t);
		t = t + 0.01;
		float z = Q_rsqrt(a + t);
		a = z;
	}

	LARGE_INTEGER tsc2;
	__asm
	{
		cpuid
		rdtsc
		mov tsc2.LowPart, eax
		mov tsc2.HighPart, edx
	}

	cout << (tsc2.QuadPart - tsc.QuadPart) << "   " << a << endl;


	t = 10.0f;

	//LARGE_INTEGER tsc;
	__asm
	{
		cpuid
		rdtsc
		mov tsc.LowPart, eax
		mov tsc.HighPart, edx
	}

	for (int x = 0; x < 1000000000; x++)
	{
		a = float(1.0 / sqrt(t));
		t = t + 0.01;
		float z = float(1.0 / sqrt(a + t));
		a = z;
	}

	//LARGE_INTEGER tsc2;
	__asm
	{
		cpuid
		rdtsc
		mov tsc2.LowPart, eax
		mov tsc2.HighPart, edx
	}

	cout << (tsc2.QuadPart - tsc.QuadPart) << "  "<< a << endl;


	char pause;
	cin >> pause;
}