r_sky.c

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#include "quakedef.h"
#include "image.h"
 
// FIXME: fix skybox after vid_restart
cvar_t r_sky = {CF_CLIENT | CF_ARCHIVE, "r_sky", "1", "enables sky rendering (black otherwise)"};
cvar_t r_skyscroll1 = {CF_CLIENT | CF_ARCHIVE, "r_skyscroll1", "1", "speed at which upper clouds layer scrolls in quake sky"};
cvar_t r_skyscroll2 = {CF_CLIENT | CF_ARCHIVE, "r_skyscroll2", "2", "speed at which lower clouds layer scrolls in quake sky"};
cvar_t r_sky_scissor = {CF_CLIENT, "r_sky_scissor", "1", "limit rendering of sky to approximately the area of the sky surfaces"};
int skyrenderlater;
int skyrendermasked;
int skyscissor[4];
 
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
{
    const char *suffix;
    qbool flipx, flipy, flipdiagonal;
}
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;
    // we can scissor the sky to just the relevant area
    Vector4Clear(skyscissor);
    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])
        {
            R_SkinFrame_PurgeSkinFrame(skyboxskinframe[i]);
            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, 0, 0, 0, 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;
    }
 
    dp_strlcpy(skyname, sky, sizeof(skyname));
 
    return R_LoadSkyBox();
}
 
// LadyHavoc: added LoadSky console command
static void LoadSky_f(cmd_state_t *cmd)
{
    switch (Cmd_Argc(cmd))
    {
    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(cmd, 1)))
        {
            if (skyname[0])
                Con_Printf("skybox set to %s\n", skyname);
            else
                Con_Print("skybox disabled\n");
        }
        else
            Con_Printf(CON_ERROR "failed to load skybox %s\n", Cmd_Argv(cmd, 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, 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 qbool 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, 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, 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 (r_sky_scissor.integer)
    {
        // if the scissor is empty just return
        if (skyscissor[2] == 0 || skyscissor[3] == 0)
            return;
        GL_Scissor(skyscissor[0], skyscissor[1], skyscissor[2], skyscissor[3]);
        GL_ScissorTest(true);
    }
    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);
    }
    */
    GL_Scissor(r_refdef.view.viewport.x, r_refdef.view.viewport.y, r_refdef.view.viewport.width, r_refdef.view.viewport.height);
}
 
//===============================================================
 
void R_ResetSkyBox(void)
{
    R_UnloadSkyBox();
    memset(skyname,0,MAX_QPATH);
    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(CF_CLIENT, "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);
    Cvar_RegisterVariable (&r_sky_scissor);
    memset(&skyboxskinframe, 0, sizeof(skyboxskinframe));
    skyname[0] = 0;
    R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap, NULL, NULL);
}