#include "quakedef.h"

#include "image.h"

// FIXME: fix skybox after vid_restart

cvar_t r_sky = {CVAR_SAVE, "r_sky", "1", "enables sky rendering (black otherwise)"};

cvar_t r_skyscroll1 = {CVAR_SAVE, "r_skyscroll1", "1", "speed at which upper clouds layer scrolls in quake sky"};

cvar_t r_skyscroll2 = {CVAR_SAVE, "r_skyscroll2", "2", "speed at which lower clouds layer scrolls in quake sky"};

int skyrenderlater;

int skyrendermasked;

static int skyrendersphere;

static int skyrenderbox;

static rtexturepool_t *skytexturepool;

static char skyname[MAX_QPATH];

static matrix4x4_t skymatrix;

static matrix4x4_t skyinversematrix;

typedef struct suffixinfo_s

}

suffixinfo_t;

static const suffixinfo_t suffix[3][6] =

{

{

{"px", false, false, false},

{"nx", false, false, false},

{"py", false, false, false},

{"ny", false, false, false},

{"pz", false, false, false},

{"nz", false, false, false}

},

{

{"posx", false, false, false},

{"negx", false, false, false},

{"posy", false, false, false},

{"negy", false, false, false},

{"posz", false, false, false},

{"negz", false, false, false}

},

{

{"rt", false, false, true},

{"lf", true, true, true},

{"bk", false, true, false},

{"ft", true, false, false},

{"up", false, false, true},

{"dn", false, false, true}

}

};

static skinframe_t *skyboxskinframe[6];

void R_SkyStartFrame(void)

{

skyrendersphere = false;

skyrenderbox = false;

skyrendermasked = false;

// for depth-masked sky, we need to know whether any sky was rendered

skyrenderlater = false;

if (r_sky.integer)

{

if (skyboxskinframe[0] || skyboxskinframe[1] || skyboxskinframe[2] || skyboxskinframe[3] || skyboxskinframe[4] || skyboxskinframe[5])

skyrenderbox = true;

else if (r_refdef.scene.worldmodel && r_refdef.scene.worldmodel->brush.solidskyskinframe)

skyrendersphere = true;

skyrendermasked = true;

}

}

/*

==================

R_SetSkyBox

==================

*/

static void R_UnloadSkyBox(void)

{

int i;

int c = 0;

for (i = 0;i < 6;i++)

{

if (skyboxskinframe[i])

{

// TODO: make a R_SkinFrame_Purge for single skins...

c++;

}

skyboxskinframe[i] = NULL;

}

if (c && developer_loading.integer)

Con_Printf("unloading skybox\n");

}

static int R_LoadSkyBox(void)

{

int i, j, success;

int indices[4] = {0,1,2,3};

char name[MAX_INPUTLINE];

unsigned char *image_buffer;

unsigned char *temp;

char vabuf[1024];

R_UnloadSkyBox();

if (!skyname[0])

return true;

for (j=0; j<3; j++)

{

success = 0;

for (i=0; i<6; i++)

{

if (dpsnprintf(name, sizeof(name), "%s_%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))

{

if (dpsnprintf(name, sizeof(name), "%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))

{

if (dpsnprintf(name, sizeof(name), "env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))

{

if (dpsnprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_buffer = loadimagepixelsbgra(name, false, false, false, NULL)))

continue;

}

}

}

temp = (unsigned char *)Mem_Alloc(tempmempool, image_width*image_height*4);

Image_CopyMux (temp, image_buffer, image_width, image_height, suffix[j][i].flipx, suffix[j][i].flipy, suffix[j][i].flipdiagonal, 4, 4, indices);

skyboxskinframe[i] = R_SkinFrame_LoadInternalBGRA(va(vabuf, sizeof(vabuf), "skyboxside%d", i), TEXF_CLAMP | (gl_texturecompression_sky.integer ? TEXF_COMPRESS : 0), temp, image_width, image_height, vid.sRGB3D);

Mem_Free(image_buffer);

Mem_Free(temp);

success++;

}

if (success)

break;

}

if (j == 3)

return false;

if (developer_loading.integer)

Con_Printf("loading skybox \"%s\"\n", name);

return true;

}

int R_SetSkyBox(const char *sky)

{

if (strcmp(sky, skyname) == 0) // no change

return true;

if (strlen(sky) > 1000)

{

Con_Printf("sky name too long (%i, max is 1000)\n", (int)strlen(sky));

return false;

}

strlcpy(skyname, sky, sizeof(skyname));

return R_LoadSkyBox();

}

// LordHavoc: added LoadSky console command

static void LoadSky_f (void)

{

switch (Cmd_Argc())

{

case 1:

if (skyname[0])

Con_Printf("current sky: %s\n", skyname);

else

Con_Print("no skybox has been set\n");

break;

case 2:

if (R_SetSkyBox(Cmd_Argv(1)))

{

if (skyname[0])

Con_Printf("skybox set to %s\n", skyname);

else

Con_Print("skybox disabled\n");

}

else

Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));

break;

default:

Con_Print("usage: loadsky skyname\n");

break;

}

}

static const float skyboxvertex3f[6*4*3] =

{

// skyside[0]

16, -16, 16,

16, -16, -16,

16, 16, -16,

16, 16, 16,

// skyside[1]

-16, 16, 16,

-16, 16, -16,

-16, -16, -16,

-16, -16, 16,

// skyside[2]

16, 16, 16,

16, 16, -16,

-16, 16, -16,

-16, 16, 16,

// skyside[3]

-16, -16, 16,

-16, -16, -16,

16, -16, -16,

16, -16, 16,

// skyside[4]

-16, -16, 16,

16, -16, 16,

16, 16, 16,

-16, 16, 16,

// skyside[5]

16, -16, -16,

-16, -16, -16,

-16, 16, -16,

16, 16, -16

};

static const float skyboxtexcoord2f[6*4*2] =

{

// skyside[0]

0, 1,

1, 1,

1, 0,

0, 0,

// skyside[1]

1, 0,

0, 0,

0, 1,

1, 1,

// skyside[2]

1, 1,

1, 0,

0, 0,

0, 1,

// skyside[3]

0, 0,

0, 1,

1, 1,

1, 0,

// skyside[4]

0, 1,

1, 1,

1, 0,

0, 0,

// skyside[5]

0, 1,

1, 1,

1, 0,

0, 0

};

static const int skyboxelement3i[6*2*3] =

{

// skyside[3]

0, 1, 2,

0, 2, 3,

// skyside[1]

4, 5, 6,

4, 6, 7,

// skyside[0]

8, 9, 10,

8, 10, 11,

// skyside[2]

12, 13, 14,

12, 14, 15,

// skyside[4]

16, 17, 18,

16, 18, 19,

// skyside[5]

20, 21, 22,

20, 22, 23

};

static const unsigned short skyboxelement3s[6*2*3] =

{

// skyside[3]

0, 1, 2,

0, 2, 3,

// skyside[1]

4, 5, 6,

4, 6, 7,

// skyside[0]

8, 9, 10,

8, 10, 11,

// skyside[2]

12, 13, 14,

12, 14, 15,

// skyside[4]

16, 17, 18,

16, 18, 19,

// skyside[5]

20, 21, 22,

20, 22, 23

};

static void R_SkyBox(void)

{

int i;

RSurf_ActiveCustomEntity(&skymatrix, &skyinversematrix, 0, 0, 1, 1, 1, 1, 6*4, skyboxvertex3f, skyboxtexcoord2f, NULL, NULL, NULL, NULL, 6*2, skyboxelement3i, skyboxelement3s, false, false);

for (i = 0;i < 6;i++)

if(skyboxskinframe[i])

R_DrawCustomSurface(skyboxskinframe[i], &identitymatrix, MATERIALFLAG_SKY | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE | MATERIALFLAG_NODEPTHTEST, i*4, 4, i*2, 2, false, false);

}

#define skygridx 32

#define skygridx1 (skygridx + 1)

#define skygridxrecip (1.0f / (skygridx))

#define skygridy 32

#define skygridy1 (skygridy + 1)

#define skygridyrecip (1.0f / (skygridy))

#define skysphere_numverts (skygridx1 * skygridy1)

#define skysphere_numtriangles (skygridx * skygridy * 2)

static float skysphere_vertex3f[skysphere_numverts * 3];

static float skysphere_texcoord2f[skysphere_numverts * 2];

static int skysphere_element3i[skysphere_numtriangles * 3];

static unsigned short skysphere_element3s[skysphere_numtriangles * 3];

static void skyspherecalc(void)

{

int i, j;

unsigned short *e;

float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;

float dx, dy, dz;

dx = 16.0f;

dy = 16.0f;

dz = 16.0f / 3.0f;

vertex3f = skysphere_vertex3f;

texcoord2f = skysphere_texcoord2f;

for (j = 0;j <= skygridy;j++)

{

a = j * skygridyrecip;

ax = cos(a * M_PI * 2);

ay = -sin(a * M_PI * 2);

for (i = 0;i <= skygridx;i++)

{

b = i * skygridxrecip;

x = cos((b + 0.5) * M_PI);

v[0] = ax*x * dx;

v[1] = ay*x * dy;

v[2] = -sin((b + 0.5) * M_PI) * dz;

length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));

*texcoord2f++ = v[0] * length;

*texcoord2f++ = v[1] * length;

*vertex3f++ = v[0];

*vertex3f++ = v[1];

*vertex3f++ = v[2];

}

}

e = skysphere_element3s;

for (j = 0;j < skygridy;j++)

{

for (i = 0;i < skygridx;i++)

{

*e++ = j * skygridx1 + i;

*e++ = j * skygridx1 + i + 1;

*e++ = (j + 1) * skygridx1 + i;

*e++ = j * skygridx1 + i + 1;

*e++ = (j + 1) * skygridx1 + i + 1;

*e++ = (j + 1) * skygridx1 + i;

}

}

for (i = 0;i < skysphere_numtriangles*3;i++)

skysphere_element3i[i] = skysphere_element3s[i];

}

static void R_SkySphere(void)

{

double speedscale;

static qboolean skysphereinitialized = false;

matrix4x4_t scroll1matrix, scroll2matrix;

if (!skysphereinitialized)

{

skysphereinitialized = true;

skyspherecalc();

}

// wrap the scroll values just to be extra kind to float accuracy

// scroll speed for upper layer

speedscale = r_refdef.scene.time*r_skyscroll1.value*8.0/128.0;

speedscale -= floor(speedscale);

Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);

// scroll speed for lower layer (transparent layer)

speedscale = r_refdef.scene.time*r_skyscroll2.value*8.0/128.0;

speedscale -= floor(speedscale);

Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);

RSurf_ActiveCustomEntity(&skymatrix, &skyinversematrix, 0, 0, 1, 1, 1, 1, skysphere_numverts, skysphere_vertex3f, skysphere_texcoord2f, NULL, NULL, NULL, NULL, skysphere_numtriangles, skysphere_element3i, skysphere_element3s, false, false);

R_DrawCustomSurface(r_refdef.scene.worldmodel->brush.solidskyskinframe, &scroll1matrix, MATERIALFLAG_SKY | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE | MATERIALFLAG_NODEPTHTEST , 0, skysphere_numverts, 0, skysphere_numtriangles, false, false);

R_DrawCustomSurface(r_refdef.scene.worldmodel->brush.alphaskyskinframe, &scroll2matrix, MATERIALFLAG_SKY | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE | MATERIALFLAG_NODEPTHTEST | MATERIALFLAG_ALPHA | MATERIALFLAG_BLENDED, 0, skysphere_numverts, 0, skysphere_numtriangles, false, false);

}

void R_Sky(void)

{

Matrix4x4_CreateFromQuakeEntity(&skymatrix, r_refdef.view.origin[0], r_refdef.view.origin[1], r_refdef.view.origin[2], 0, 0, 0, r_refdef.farclip * (0.5f / 16.0f));

Matrix4x4_Invert_Simple(&skyinversematrix, &skymatrix);

if (skyrendersphere)

{

// this does not modify depth buffer

R_SkySphere();

}

else if (skyrenderbox)

{

// this does not modify depth buffer

R_SkyBox();

}

/* this will be skyroom someday

else

{

// this modifies the depth buffer so we have to clear it afterward

//R_SkyRoom();

// clear the depthbuffer that was used while rendering the skyroom

//GL_Clear(GL_DEPTH_BUFFER_BIT);

}

*/

}

//===============================================================

void R_ResetSkyBox(void)

{

R_UnloadSkyBox();

skyname[0] = 0;

R_LoadSkyBox();

}

static void r_sky_start(void)

{

skytexturepool = R_AllocTexturePool();

R_LoadSkyBox();

}

static void r_sky_shutdown(void)

{

R_UnloadSkyBox();

R_FreeTexturePool(&skytexturepool);

}

static void r_sky_newmap(void)

{

}

void R_Sky_Init(void)

{

Cmd_AddCommand ("loadsky", &LoadSky_f, "load a skybox by basename (for example loadsky mtnsun_ loads mtnsun_ft.tga and so on)");

Cvar_RegisterVariable (&r_sky);

Cvar_RegisterVariable (&r_skyscroll1);

Cvar_RegisterVariable (&r_skyscroll2);

memset(&skyboxskinframe, 0, sizeof(skyboxskinframe));

skyname[0] = 0;

R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap, NULL, NULL);

}