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Light.cpp
176 lines (132 loc) · 4.48 KB
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Light.cpp
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/*-----------------------------------------------------------------------------
Light.cpp
2006 Shamus Young
-------------------------------------------------------------------------------
This tracks and renders the light sources. (Note that they do not really
CAST light in the OpenGL sense of the world, these are just simple panels.)
These are NOT subclassed to entities because these are dynamic. Some lights
blink, and thus they can't go into the fixed render lists managed by
Entity.cpp.
-----------------------------------------------------------------------------*/
#define MAX_SIZE 5
#include <windows.h>
#include <math.h>
#include <gl\gl.h>
#include <gl\glu.h>
#include <gl\glaux.h>
#include "glTypes.h"
#include "camera.h"
#include "entity.h"
#include "light.h"
#include "macro.h"
#include "math.h"
#include "random.h"
#include "render.h"
#include "texture.h"
#include "visible.h"
static GLvector2 angles[5][360];
static CLight* head;
static bool angles_done;
static int count;
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void LightClear ()
{
CLight* l;
while (head) {
l = head;
head = l->_next;
delete l;
}
count = 0;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
int LightCount ()
{
return count;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void LightRender ()
{
CLight* l;
if (!EntityReady ())
return;
if (!angles_done) {
for (int size = 0; size < MAX_SIZE; size++) {
for (int i = 0 ;i < 360; i++) {
angles[size][i].x = cosf ((float)i * DEGREES_TO_RADIANS) * ((float)size + 0.5f);
angles[size][i].y = sinf ((float)i * DEGREES_TO_RADIANS) * ((float)size + 0.5f);
}
}
}
glDepthMask (false);
glEnable (GL_BLEND);
glDisable (GL_CULL_FACE);
glBlendFunc (GL_ONE, GL_ONE);
glBindTexture(GL_TEXTURE_2D, TextureId (TEXTURE_LIGHT));
glDisable (GL_CULL_FACE);
glBegin (GL_QUADS);
for (l = head; l; l = l->_next)
l->Render ();
glEnd ();
glDepthMask (true);
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
CLight::CLight (GLvector pos, GLrgba color, int size)
{
_position = pos;
_color = color;
_size = CLAMP (size, 0, (MAX_SIZE - 1));
_vert_size = (float)_size + 0.5f;
_flat_size = _vert_size + 0.5f;
_blink = false;
_cell_x = WORLD_TO_GRID(pos.x);
_cell_z = WORLD_TO_GRID(pos.z);
_next = head;
head = this;
count++;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void CLight::Blink ()
{
_blink = true;
//we don't want blinkers to be in sync, so have them blink at
//slightly different rates. (Milliseconds)
_blink_interval = 1500 + RandomVal (500);
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void CLight::Render ()
{
int angle;
GLvector pos;
GLvector camera;
GLvector camera_position;
GLvector2 offset;
if (!Visible (_cell_x, _cell_z))
return;
camera = CameraAngle ();
camera_position = CameraPosition ();
if (fabs (camera_position.x - _position.x) > RenderFogDistance ())
return;
if (fabs (camera_position.z - _position.z) > RenderFogDistance ())
return;
if (_blink && (GetTickCount () % _blink_interval) > 200)
return;
angle = (int)MathAngle (camera.y);
offset = angles[_size][angle];
pos = _position;
glColor4fv (&_color.red);
glTexCoord2f (0, 0);
glVertex3f (pos.x + offset.x, pos.y - _vert_size, pos.z + offset.y);
glTexCoord2f (0, 1);
glVertex3f (pos.x - offset.x, pos.y - _vert_size, pos.z - offset.y);
glTexCoord2f (1, 1);
glVertex3f (pos.x - offset.x, pos.y + _vert_size, pos.z - offset.y);
glTexCoord2f (1, 0);
glVertex3f (pos.x + offset.x, pos.y + _vert_size, pos.z + offset.y);
}