r_image.cpp

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/*
Copyright (C) 1997-2001 Id Software, Inc.
 
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
See the GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
*/
 
#include "r_local.h"
#include "r_error.h"
#include "r_geoscape.h"
#include "../../shared/images.h"
#include "../cl_screen.h"
 
#define MAX_IMAGEHASH 256
static image_t* imageHash[MAX_IMAGEHASH];
 
#define IMAGE_ARRAY_SIZE 128
typedef struct imageArray_s {
    image_t images[IMAGE_ARRAY_SIZE];
    struct imageArray_s* next;
} imageArray_t;
 
imageArray_t r_images;
int r_numImages;
 
/* Wicked for()-loop to go through all images in the r_images linked list. Parameters are: (int i, image_t* image, imageArray_t* imageArray) */
#define FOR_EACH_IMAGE(i, image, imageArray) \
    for (i = 0, imageArray = &r_images, image = &imageArray->images[0]; i < r_numImages; i++, image++, \
            (i % IMAGE_ARRAY_SIZE) ? 0 : (image = (imageArray = imageArray->next) ? &imageArray->images[0] : nullptr))
 
 
/* generic environment map */
image_t* r_envmaptextures[MAX_ENVMAPTEXTURES];
 
/* lense flares */
image_t* r_flaretextures[NUM_FLARETEXTURES];
 
#define MAX_TEXTURE_SIZE 8192

void R_ImageClearMaterials (void)
{
    int i;
    image_t* image;
    imageArray_t* images;
 
    /* clear previously loaded materials */
    FOR_EACH_IMAGE(i, image, images) {
        material_t* m = &image->material;
        materialStage_t* s = m->stages;
 
        while (s) {  /* free the stages chain */
            materialStage_t* ss = s->next;
            Mem_Free(s);
            s = ss;
        }
 
        *m = defaultMaterial;
    }
}

void R_ImageList_f (void)
{
    int i, cnt;
    image_t* image;
    imageArray_t* images;
    int texels;
 
    Com_Printf("------------------\n");
    texels = 0;
    cnt = 0;
 
    FOR_EACH_IMAGE(i, image, images) {
        const char* type;
        if (!image->texnum)
            continue;
        cnt++;
        texels += image->upload_width * image->upload_height;
        switch (image->type) {
        case it_effect:
            type = "EF";
            break;
        case it_skin:
            type = "SK";
            break;
        case it_wrappic:
            type = "WR";
            break;
        case it_chars:
            type = "CH";
            break;
        case it_static:
            type = "ST";
            break;
        case it_normalmap:
            type = "NM";
            break;
        case it_material:
            type = "MA";
            break;
        case it_lightmap:
            type = "LM";
            break;
        case it_world:
            type = "WO";
            break;
        case it_pic:
            type = "PI";
            break;
        default:
            type = "  ";
            break;
        }
 
        Com_Printf("%s %4i %4i RGB: %5i idx: %s\n", type, image->upload_width, image->upload_height, image->texnum, image->name);
    }
    Com_Printf("Total textures: %i/%i (max textures: %i)\n", cnt, r_numImages, MAX_GL_TEXTURES);
    Com_Printf("Total texel count (not counting mipmaps): %i\n", texels);
}

void R_LoadImage (const char* name, byte** pic, int* width, int* height)
{
    char filenameTemp[MAX_QPATH];
    SDL_Surface* surf;
 
    if (Q_strnull(name))
        Com_Error(ERR_FATAL, "R_LoadImage: nullptr name");
 
    Com_StripExtension(name, filenameTemp, sizeof(filenameTemp));
 
    if ((surf = Img_LoadImage(filenameTemp))) {
        const size_t size = (surf->w * surf->h) * 4;
        *width = surf->w;
        *height = surf->h;
        *pic = Mem_PoolAllocTypeN(byte, size, vid_imagePool);
        memcpy(*pic, surf->pixels, size);
        SDL_FreeSurface(surf);
    }
}
 
void R_ScaleTexture (const unsigned* in, int inwidth, int inheight, unsigned* out, int outwidth, int outheight)
{
    int i;
    unsigned p1[MAX_TEXTURE_SIZE], p2[MAX_TEXTURE_SIZE];
    const unsigned fracstep = inwidth * 0x10000 / outwidth;
 
    assert(outwidth <= MAX_TEXTURE_SIZE);
 
    unsigned frac = fracstep >> 2;
    for (i = 0; i < outwidth; i++) {
        p1[i] = 4 * (frac >> 16);
        frac += fracstep;
    }
    frac = 3 * (fracstep >> 2);
    for (i = 0; i < outwidth; i++) {
        p2[i] = 4 * (frac >> 16);
        frac += fracstep;
    }
 
    for (i = 0; i < outheight; i++, out += outwidth) {
        const int index = inwidth * (int) ((i + 0.25) * inheight / outheight);
        const unsigned* inrow = in + index;
        const int index2 = inwidth * (int) ((i + 0.75) * inheight / outheight);
        const unsigned* inrow2 = in + index2;
 
        assert(index < inwidth * inheight);
        assert(index2 < inwidth * inheight);
 
        for (int j = 0; j < outwidth; j++) {
            const byte* pix1 = (const byte*) inrow + p1[j];
            const byte* pix2 = (const byte*) inrow + p2[j];
            const byte* pix3 = (const byte*) inrow2 + p1[j];
            const byte* pix4 = (const byte*) inrow2 + p2[j];
            ((byte*) (out + j))[0] = (pix1[0] + pix2[0] + pix3[0] + pix4[0]) >> 2;
            ((byte*) (out + j))[1] = (pix1[1] + pix2[1] + pix3[1] + pix4[1]) >> 2;
            ((byte*) (out + j))[2] = (pix1[2] + pix2[2] + pix3[2] + pix4[2]) >> 2;
            ((byte*) (out + j))[3] = (pix1[3] + pix2[3] + pix3[3] + pix4[3]) >> 2;
        }
    }
}

void R_GetScaledTextureSize (int width, int height, int* scaledWidth, int* scaledHeight)
{
    for (*scaledWidth = 1; *scaledWidth < width; *scaledWidth <<= 1) {}
    for (*scaledHeight = 1; *scaledHeight < height; *scaledHeight <<= 1) {}
 
    while (*scaledWidth > r_config.maxTextureSize || *scaledHeight > r_config.maxTextureSize) {
        *scaledWidth >>= 1;
        *scaledHeight >>= 1;
    }
 
    if (*scaledWidth > MAX_TEXTURE_SIZE)
        *scaledWidth = MAX_TEXTURE_SIZE;
    else if (*scaledWidth < 1)
        *scaledWidth = 1;
 
    if (*scaledHeight > MAX_TEXTURE_SIZE)
        *scaledHeight = MAX_TEXTURE_SIZE;
    else if (*scaledHeight < 1)
        *scaledHeight = 1;
}
 
inline static bool R_IsClampedImageType (imagetype_t type)
{
    return type == it_pic || type == it_worldrelated;
}
 
#ifdef GL_VERSION_ES_CM_1_0
inline static void R_StripAlpha (const unsigned* data, unsigned* buffer, const unsigned count)
{
    for (unsigned i = 0; i < count; ++i, ++data) {
        memmove(((byte*)buffer) + i * 3, (const byte*)data, 3);
    }
}
#endif

void R_UploadTexture (const unsigned* data, int width, int height, image_t* image)
{
    const bool mipmap = (image->type != it_pic && image->type != it_worldrelated && image->type != it_chars);
    const bool clamp = R_IsClampedImageType(image->type);
#ifdef GL_VERSION_ES_CM_1_0
    GLint texFormat = GL_RGB;
#else
    GLint texFormat = r_config.gl_compressed_solid_format ? r_config.gl_compressed_solid_format : r_config.gl_solid_format;
#endif
 
    /* scan the texture for any non-255 alpha */
    int i;
    const byte* scan;
    const int c = width * height;
    /* set scan to the first alpha byte */
    for (i = 0, scan = ((const byte*) data) + 3; i < c; ++i, scan += 4) {
        if (*scan != 255) {
#ifdef GL_VERSION_ES_CM_1_0
            texFormat = GL_RGBA;
#else
            texFormat = r_config.gl_compressed_alpha_format ? r_config.gl_compressed_alpha_format : r_config.gl_alpha_format;
#endif
            image->has_alpha = true;
            break;
        }
    }
 
    int scaledWidth, scaledHeight;
    R_GetScaledTextureSize(width, height, &scaledWidth, &scaledHeight);
 
    image->upload_width = scaledWidth;  /* after power of 2 and scales */
    image->upload_height = scaledHeight;
 
    unsigned* tmpBuff = nullptr;
    /* some images need very little attention (pics, fonts, etc..) */
    if (!mipmap && scaledWidth == width && scaledHeight == height) {
        /* no mipmapping for these images to save memory */
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        if (clamp) {
            glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
            R_CheckError();
            glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
            R_CheckError();
        }
#ifdef GL_VERSION_ES_CM_1_0
        /* Strip alpha, see comments below */
        if (texFormat == GL_RGB) {
            const int count = scaledWidth * scaledHeight;
            tmpBuff = Mem_PoolAllocTypeN(unsigned, count, vid_imagePool);
            R_StripAlpha(data, tmpBuff, count);
        }
        GLenum bFormat = texFormat;
#else
        GLenum bFormat = GL_RGBA;
#endif
        glTexImage2D(GL_TEXTURE_2D, 0, texFormat, scaledWidth, scaledHeight, 0, bFormat, GL_UNSIGNED_BYTE, tmpBuff ? tmpBuff : data);
        if (tmpBuff)
            Mem_Free(tmpBuff);
        return;
    }
 
    if (scaledWidth != width || scaledHeight != height) {  /* whereas others need to be scaled */
        tmpBuff = Mem_PoolAllocTypeN(unsigned, scaledWidth * scaledHeight, vid_imagePool);
        R_ScaleTexture(data, width, height, tmpBuff, scaledWidth, scaledHeight);
    }
 
#ifdef GL_VERSION_ES_CM_1_0
    /*
     * According to https://www.khronos.org/opengles/sdk/1.1/docs/man/glTexImage2D.xml
     * texture format *must* match the data format, which we *always* read as RGBA,
     * so we need to strip the alpha if we want to upload as RGB, and we want: memory *is*
     * usually a concern on an ES.
     */
    if (texFormat == GL_RGB) {
        const int count = scaledWidth * scaledHeight;
        if (!tmpBuff)
            tmpBuff = Mem_PoolAllocTypeN(unsigned, count, vid_imagePool);
        R_StripAlpha(c == count ? data : tmpBuff, tmpBuff, count);
    }
#endif
 
    /* and mipmapped */
    if (mipmap) {
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, r_config.gl_filter_min);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, r_config.gl_filter_max);
        glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
        if (r_config.anisotropic) {
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, r_config.maxAnisotropic);
            R_CheckError();
        }
#ifndef GL_VERSION_ES_CM_1_0
        if (r_texture_lod->integer && r_config.lod_bias) {
            glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, r_texture_lod->value);
            R_CheckError();
        }
#endif
    } else {
        if (r_config.anisotropic) {
            glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
            R_CheckError();
        }
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, r_config.gl_filter_max);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, r_config.gl_filter_max);
    }
    R_CheckError();
 
    if (clamp) {
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        R_CheckError();
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        R_CheckError();
    }
 
#ifdef GL_VERSION_ES_CM_1_0
    const GLenum bFormat = texFormat;
#else
    const GLenum bFormat = GL_RGBA;
#endif
    glTexImage2D(GL_TEXTURE_2D, 0, texFormat, scaledWidth, scaledHeight, 0, bFormat, GL_UNSIGNED_BYTE, tmpBuff ? tmpBuff : data);
    R_CheckError();
 
    if (tmpBuff)
        Mem_Free(tmpBuff);
}

void R_SoftenTexture (byte* in, int width, int height, int bpp)
{
    const int size = width * height * bpp;
 
    /* soften into a copy of the original image, as in-place would be incorrect */
    byte* const out = Mem_PoolAllocTypeN(byte, size, vid_imagePool);
    if (!out)
        Com_Error(ERR_FATAL, "R_SoftenTexture: failed on allocation of %i bytes", width * height * bpp);
 
    memcpy(out, in, size);
 
    for (int i = 1; i < height - 1; i++) {
        for (int j = 1; j < width - 1; j++) {
            const byte* src = in + ((i * width) + j) * bpp;  /* current input pixel */
 
            const byte* u = (src - (width * bpp));  /* and it's neighbors */
            const byte* d = (src + (width * bpp));
            const byte* l = (src - (1 * bpp));
            const byte* r = (src + (1 * bpp));
 
            byte* dest = out + ((i * width) + j) * bpp;  /* current output pixel */
 
            for (int k = 0; k < bpp; k++)
                dest[k] = (u[k] + d[k] + l[k] + r[k]) / 4;
        }
    }
 
    /* copy the softened image over the input image, and free it */
    memcpy(in, out, size);
    Mem_Free(out);
}
 
void R_UploadAlpha (const image_t* image, const byte* alphaData)
{
    R_BindTexture(image->texnum);
 
    glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, image->width, image->height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, alphaData);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, r_config.gl_filter_max);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, r_config.gl_filter_max);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    if (image->type == it_wrappic)
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
}
 
static inline void R_DeleteImage (image_t* image)
{
    const unsigned int hash = Com_HashKey(image->name, MAX_IMAGEHASH);
    for (image_t** anchor = &imageHash[hash]; *anchor; anchor = &(*anchor)->hash_next) {
        if (Q_streq((*anchor)->name, image->name)) {
            HASH_Delete(anchor);
            break;
        }
    }
 
    /* free it */
    glDeleteTextures(1, &image->texnum);
    R_CheckError();
 
    OBJZERO(*image);
}
 
image_t* R_GetImage (const char* name)
{
    image_t* image;
    const unsigned hash = Com_HashKey(name, MAX_IMAGEHASH);
 
    /* look for it */
    for (image = imageHash[hash]; image; image = image->hash_next)
        if (Q_streq(name, image->name))
            return image;
 
    return nullptr;
}

image_t* R_LoadImageData (const char* name, const byte* pic, int width, int height, imagetype_t type)
{
    image_t* image;
    imageArray_t* images;
    int i;
    size_t len;
    unsigned hash;
 
    len = strlen(name);
    if (len >= sizeof(image->name))
        Com_Error(ERR_DROP, "R_LoadImageData: \"%s\" is too long", name);
    if (len == 0)
        Com_Error(ERR_DROP, "R_LoadImageData: name is empty");
 
    /* look for it */
    image = R_GetImage(name);
    if (image) {
        assert(image->texnum);
        Com_Printf("R_LoadImageData: image '%s' is already uploaded\n", name);
        return image;
    }
 
    /* find a free image_t, using a wicked for()-loop */
    FOR_EACH_IMAGE(i, image, images) {
        if (!image->texnum)
            break;
    }
 
    if (i == r_numImages) {
        /* Did we run out of space in the current array? Add a new array chunk */
        if (r_numImages % IMAGE_ARRAY_SIZE == 0) {
            for (images = &r_images; images->next;)
                images = images->next;
            images->next = Mem_AllocType(imageArray_t);
            image = &images->next->images[0];
        }
        r_numImages++;
    }
    OBJZERO(*image);
    image->material = defaultMaterial;
    image->has_alpha = false;
    image->type = type;
    image->width = width;
    image->height = height;

#ifdef COMPILE_UNITTESTS
    {
        static int texnum = 0;
        image->texnum = ++texnum;
    }
#else
    glGenTextures(1, &image->texnum);
#endif
 
    Q_strncpyz(image->name, name, sizeof(image->name));
    /* drop extension */
    if (len >= 4 && image->name[len - 4] == '.') {
        image->name[len - 4] = '\0';
        Com_Printf("Image with extension: '%s'\n", name);
    }
 
    hash = Com_HashKey(image->name, MAX_IMAGEHASH);
    HASH_Add(imageHash, image, hash);
 
    if (pic) {
        R_BindTexture(image->texnum);
        R_UploadTexture((const unsigned* ) pic, width, height, image);
    }
    return image;
}
 
image_t* R_RenderToTexture (const char* name, int x, int y, int w, int h)
{
    image_t* img = R_GetImage(name);
    const bool dimensionDiffer = img != nullptr && img->width != w && img->height != h;
    if (img == nullptr || dimensionDiffer) {
        if (dimensionDiffer) {
            R_DeleteImage(img);
        }
        byte* const buf = Mem_PoolAllocTypeN(byte, w * h * 4, vid_imagePool);
        img = R_LoadImageData(name, buf, w, h, it_effect);
        Mem_Free(buf);
    }
 
    glFlush();
#ifndef GL_VERSION_ES_CM_1_0
    glReadBuffer(GL_BACK);
#endif
    R_SelectTexture(&texunit_diffuse);
    R_BindTexture(img->texnum);
    glCopyTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, x, y, w, h, 0);
 
    return img;
}

static void R_ChangeImageType(image_t* img, imagetype_t type)
{
    if (!img)
        return;
 
    img->type = type;
    R_BindTexture(img->texnum);
 
    if (R_IsClampedImageType(type)) {
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    } else {
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    }
}

image_t* R_FindImage (const char* pname, imagetype_t type)
{
    char lname[MAX_QPATH];
    image_t* image;
    SDL_Surface* surf;
 
    if (!pname || !pname[0])
        Com_Error(ERR_FATAL, "R_FindImage: nullptr name");
 
    /* drop extension */
    Com_StripExtension(pname, lname, sizeof(lname));
 
    image = R_GetImage(lname);
    if (image) {
        /* Warn if game tries to use same image with different texture mapping modes */
        if (R_IsClampedImageType(image->type) != R_IsClampedImageType(type)) { 
            Com_Printf("Warning: inconsistent usage of image %s (%i,%i)\n", image->name, image->type, type);
            R_ChangeImageType(image, type);
            R_ChangeImageType(image->normalmap, type);
            R_ChangeImageType(image->roughnessmap, type);
            R_ChangeImageType(image->specularmap, type);
            R_ChangeImageType(image->glowmap, type);
        }
        return image;
    }
 
    if ((surf = Img_LoadImage(lname))) {
        image = R_LoadImageData(lname, (byte*)surf->pixels, surf->w, surf->h, type);
        SDL_FreeSurface(surf);
        if (image->type == it_world) {
            image->normalmap = R_FindImage(va("%s_nm", image->name), it_normalmap);
            if (image->normalmap == r_noTexture)
                image->normalmap = nullptr;
        }
        if (image->type != it_glowmap) {
            image->glowmap = R_FindImage(va("%s_gm", image->name), it_glowmap);
            if (image->glowmap == r_noTexture)
                image->glowmap = nullptr;
        }
        if (image->type != it_normalmap) {
            image->normalmap = R_FindImage(va("%s_nm", image->name), it_normalmap);
            if (image->normalmap == r_noTexture)
                image->normalmap = nullptr;
        }
        if (image->type != it_specularmap) {
            image->specularmap = R_FindImage(va("%s_sm", image->name), it_specularmap);
            if (image->specularmap == r_noTexture)
                image->specularmap = nullptr;
        }
        if (image->type != it_roughnessmap) {
            image->roughnessmap = R_FindImage(va("%s_rm", image->name), it_roughnessmap);
            if (image->roughnessmap == r_noTexture)
                image->roughnessmap = nullptr;
        }
    }
 
    /* no fitting texture found */
    if (!image)
        image = r_noTexture;
 
    return image;
}

const image_t* R_FindPics (const char* name)
{
    const image_t* image = R_FindImage(va("pics/%s", name), it_pic);
    if (image == r_noTexture)
        return nullptr;
    return image;
}
 
bool R_ImageExists (const char* pname, ...)
{
    char const* const* const types = Img_GetImageTypes();
    char filename[MAX_QPATH];
    va_list ap;
 
    va_start(ap, pname);
    Q_vsnprintf(filename, sizeof(filename), pname, ap);
    va_end(ap);
 
    for (int i = 0; types[i]; i++) {
        if (FS_CheckFile("%s.%s", filename, types[i]) != -1)
            return true;
    }
    return false;
}

int R_GetImageIndex (image_t* imagePtr)
{
    imageArray_t* images;
 
    for (images = &r_images; images; images = images->next) {
        if (imagePtr >= &images->images[0] && imagePtr <= &images->images[IMAGE_ARRAY_SIZE - 1])
            return imagePtr - &images->images[0];
    }
 
    return -1;
}

image_t* R_GetImageAtIndex (int i)
{
    imageArray_t* images;
 
    if (i >= r_numImages || i < 0)
        return nullptr;
 
    for (images = &r_images; i >= IMAGE_ARRAY_SIZE; i -= IMAGE_ARRAY_SIZE)
        images = images->next;
 
    return &images->images[i];
}

void R_FreeImage (image_t* image)
{
    /* free image slot */
    if (!image || !image->texnum)
        return;
 
    /* also free the several maps if they are loaded */
    if (image->normalmap)
        R_DeleteImage(image->normalmap);
    if (image->glowmap)
        R_DeleteImage(image->glowmap);
    if (image->roughnessmap)
        R_DeleteImage(image->roughnessmap);
    if (image->specularmap)
        R_DeleteImage(image->specularmap);
    R_DeleteImage(image);
}

void R_FreeWorldImages (void)
{
    int i;
    image_t* image;
    imageArray_t* images;
 
    R_CheckError();
    /* Wicked for()-loop (tm) */
    FOR_EACH_IMAGE(i, image, images) {
        if (image->type < it_world)
            continue;           /* keep them */
 
        /* free it */
        R_FreeImage(image);
    }
}
 
void R_InitImages (void)
{
    int i;
 
    r_numImages = 0;
 
    for (i = 0; i < MAX_ENVMAPTEXTURES; i++) {
        r_envmaptextures[i] = R_FindImage(va("pics/envmaps/envmap_%i", i), it_effect);
        if (r_envmaptextures[i] == r_noTexture)
            Com_Error(ERR_FATAL, "Could not load environment map %i", i);
    }
 
    for (i = 0; i < NUM_FLARETEXTURES; i++) {
        r_flaretextures[i] = R_FindImage(va("pics/flares/flare_%i", i), it_effect);
        if (r_flaretextures[i] == r_noTexture)
            Com_Error(ERR_FATAL, "Could not load lens flare %i", i);
    }
}

void R_ShutdownImages (void)
{
    int i;
    image_t* image;
    imageArray_t* images;
 
    R_CheckError();
    /* Wicked for()-loop (tm) */
    FOR_EACH_IMAGE(i, image, images) {
        if (!image->texnum)
            continue;           /* free image_t slot */
        R_DeleteImage(image);
    }
    OBJZERO(imageHash);
    OBJZERO(r_images);
    r_numImages = 0;
}
 
static void R_ReloadImageData (image_t* image)
{
    SDL_Surface* surf;
    if (image == r_noTexture || !image || !image->texnum)
        return;
 
    surf = Img_LoadImage(image->name);
    if (!surf) {
        Com_Printf("R_ReloadImageData: unable to load image %s\n", image->name);
        surf = SDL_CreateRGBSurface(0, image->width, image->height, 32,
                    0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff);
        SDL_FillRect(surf, nullptr, 0x99ff33ff); /* A random color */
    }
    glGenTextures(1, &image->texnum);
    R_BindTexture(image->texnum);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    R_UploadTexture((unsigned* )surf->pixels, surf->w, surf->h, image);
    SDL_FreeSurface(surf);
}
 
void R_ReloadImages (void)
{
    int i;
    image_t* image;
    imageArray_t* images;
 
    R_CheckError();
    glEnable(GL_TEXTURE_2D);
    FOR_EACH_IMAGE(i, image, images) {
        if (i % 5 == 0) {
            SCR_DrawLoadingScreen(false, i * 100 / r_numImages);
        }
        R_ReloadImageData(image);
        R_ReloadImageData(image->normalmap);
        R_ReloadImageData(image->glowmap);
        R_ReloadImageData(image->specularmap);
        R_ReloadImageData(image->roughnessmap);
    }
}
 
typedef struct {
    const char* name;
    int minimize, maximize;
} glTextureMode_t;
 
static const glTextureMode_t gl_texture_modes[] = {
    {"GL_NEAREST", GL_NEAREST, GL_NEAREST}, /* no filtering, no mipmaps */
    {"GL_LINEAR", GL_LINEAR, GL_LINEAR}, /* bilinear filtering, no mipmaps */
    {"GL_NEAREST_MIPMAP_NEAREST", GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST}, /* no filtering, mipmaps */
    {"GL_LINEAR_MIPMAP_NEAREST", GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR}, /* bilinear filtering, mipmaps */
    {"GL_NEAREST_MIPMAP_LINEAR", GL_NEAREST_MIPMAP_LINEAR, GL_NEAREST}, /* trilinear filtering, mipmaps */
    {"GL_LINEAR_MIPMAP_LINEAR", GL_LINEAR_MIPMAP_LINEAR, GL_LINEAR} /* bilinear filtering, trilinear filtering, mipmaps */
};
 
void R_TextureMode (const char* string)
{
    int i;
    const size_t size = lengthof(gl_texture_modes);
    const glTextureMode_t* mode = nullptr;
    for (i = 0; i < size; i++) {
        mode = &gl_texture_modes[i];
        if (!Q_strcasecmp(mode->name, string))
            break;
    }
 
    if (mode == nullptr) {
        Com_Printf("bad filter name\n");
        return;
    }
 
    r_config.gl_filter_min = mode->minimize;
    r_config.gl_filter_max = mode->maximize;
 
    /* Wicked for()-loop (tm) */
    image_t* image;
    imageArray_t* images;
    FOR_EACH_IMAGE(i, image, images) {
        if (image->type == it_pic || image->type == it_worldrelated || image->type == it_chars)
            continue; /* no mipmaps */
 
        R_BindTexture(image->texnum);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, mode->minimize);
        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, mode->maximize);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, r_config.maxAnisotropic);
        R_CheckError();
    }
}
 
#ifdef GL_VERSION_ES_CM_1_0
void R_TextureSolidMode (const char* string)
{
}
void R_TextureAlphaMode (const char* string)
{
}
#else
typedef struct {
    const char* name;
    int mode;
} gltmode_t;
 
static const gltmode_t gl_alpha_modes[] = {
    {"GL_RGBA", GL_RGBA},
    {"GL_RGBA8", GL_RGBA8},
    {"GL_RGB5_A1", GL_RGB5_A1},
    {"GL_RGBA4", GL_RGBA4},
    {"GL_RGBA2", GL_RGBA2},
    {"GL_LUMINANCE4_ALPHA4", GL_LUMINANCE4_ALPHA4},
    {"GL_LUMINANCE6_ALPHA2", GL_LUMINANCE6_ALPHA2},
    {"GL_LUMINANCE8_ALPHA8", GL_LUMINANCE8_ALPHA8},
    {"GL_LUMINANCE12_ALPHA4", GL_LUMINANCE12_ALPHA4},
    {"GL_LUMINANCE12_ALPHA12", GL_LUMINANCE12_ALPHA12},
    {"GL_LUMINANCE16_ALPHA16", GL_LUMINANCE16_ALPHA16}
};
 
 
void R_TextureAlphaMode (const char* string)
{
    const size_t size = lengthof(gl_alpha_modes);
 
    for (int i = 0; i < size; i++) {
        const gltmode_t* mode = &gl_alpha_modes[i];
        if (!Q_strcasecmp(mode->name, string)) {
            r_config.gl_alpha_format = mode->mode;
            return;
        }
    }
 
    Com_Printf("bad alpha texture mode name (%s)\n", string);
}
 
static const gltmode_t gl_solid_modes[] = {
    {"GL_RGB", GL_RGB},
    {"GL_RGB8", GL_RGB8},
    {"GL_RGB5", GL_RGB5},
    {"GL_RGB4", GL_RGB4},
    {"GL_R3_G3_B2", GL_R3_G3_B2},
    {"GL_RGB2", GL_RGB2_EXT},
    {"GL_RGB4", GL_RGB4_EXT},
    {"GL_RGB5", GL_RGB5_EXT},
    {"GL_RGB8", GL_RGB8_EXT},
    {"GL_RGB10", GL_RGB10_EXT},
    {"GL_RGB12", GL_RGB12_EXT},
    {"GL_RGB16", GL_RGB16_EXT},
    {"GL_LUMINANCE", GL_LUMINANCE},
    {"GL_LUMINANCE4", GL_LUMINANCE4},
    {"GL_LUMINANCE8", GL_LUMINANCE8},
    {"GL_LUMINANCE12", GL_LUMINANCE12},
    {"GL_LUMINANCE16", GL_LUMINANCE16}
};
 
void R_TextureSolidMode (const char* string)
{
    const size_t size = lengthof(gl_solid_modes);
 
    for (int i = 0; i < size; i++) {
        const gltmode_t* mode = &gl_solid_modes[i];
        if (!Q_strcasecmp(mode->name, string)) {
            r_config.gl_solid_format = mode->mode;
            return;
        }
    }
 
    Com_Printf("bad solid texture mode name (%s)\n", string);
}
#endif