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Sky.cpp
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Sky.cpp
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/*-----------------------------------------------------------------------------
Sky.cpp
2009 Shamus Young
-------------------------------------------------------------------------------
Did this need to be written as a class? It did not. There will never be
more than one sky in play, so the whole class structure here is superflous,
but harmless.
-----------------------------------------------------------------------------*/
#define SKYPOINTS 24
#ifdef _WIN32
#include <windows.h>
#endif
#include <math.h>
#include <GL/gl.h>
#include "Camera.h"
#include "Macro.h"
#include "Math.h"
#include "Random.h"
#include "Render.h"
#include "Sky.h"
#include "Texture.h"
#include "glTypes.h"
#include "World.h"
static CSky* sky;
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void SkyRender ()
{
if (sky && !RenderFlat ())
sky->Render ();
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void SkyClear ()
{
if(sky)
delete sky;
sky = NULL;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void CSky::Render ()
{
GLvector angle, position;
if (!TextureReady ())
return;
glDepthMask (false);
glPushAttrib (GL_POLYGON_BIT | GL_FOG_BIT);
glPolygonMode (GL_FRONT_AND_BACK, GL_FILL);
glDisable (GL_CULL_FACE);
glDisable (GL_FOG);
glPushMatrix ();
glLoadIdentity();
angle = CameraAngle ();
position = CameraPosition ();
glRotatef (angle.x, 1.0f, 0.0f, 0.0f);
glRotatef (angle.y, 0.0f, 1.0f, 0.0f);
glRotatef (angle.z, 0.0f, 0.0f, 1.0f);
glTranslatef (0.0f, -position.y / 100.0f, 0.0f);
glEnable (GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, TextureId (TEXTURE_SKY));
glCallList (m_list);
glPopMatrix ();
glPopAttrib ();
glDepthMask (true);
glEnable (GL_COLOR_MATERIAL);
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
CSky::CSky ()
{
GLvertex circle[SKYPOINTS];
GLvector pos;
float angle;
int i;
float size;
float rad;
float lum;
size = 10.0f;
for (i = 0; i < SKYPOINTS; i++) {
angle = (float)i / (float)(SKYPOINTS - 1);
angle *= 360;
angle *= DEGREES_TO_RADIANS;
circle[i].position.x = sinf (angle) * size;
circle[i].position.y = 0.1f;
circle[i].position.z = cosf (angle) * size;
circle[i].uv.x = ((float)i / (float)(SKYPOINTS - 1)) * 5.0f;
circle[i].uv.y = 0.5f;
rad = ((float)i / (SKYPOINTS - 1)) * 180.0f * DEGREES_TO_RADIANS;
lum = sinf (rad);
lum = (float)pow (lum, 5);
circle[i].color = glRgba (lum);
}
m_list = glGenLists(1);
glNewList (m_list, GL_COMPILE);
glColor3f (1, 1, 1);
glBegin (GL_QUAD_STRIP);
for (i = 0; i < SKYPOINTS; i++) {
glTexCoord2f (circle[i].uv.x, 0.0f);
glVertex3fv (&circle[i].position.x);
pos = circle[i].position;
pos.y = size / 3.5f;
glTexCoord2f (circle[i].uv.x, 1.0f);
glVertex3fv (&pos.x);
}
glEnd ();
glEndList();
sky = this;
}