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more general textures

This commit is contained in:
Zeno Rogue 2020-09-11 11:17:48 +02:00
parent db646aba5d
commit 275e6b369d
1 changed files with 34 additions and 12 deletions
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46
textures.cpp
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@ -38,15 +38,18 @@ enum eTextureState {
struct texture_data {
GLuint textureid;
int twidth;
int twidth, theight;
bool stretched;
int tx, ty, origdim;
texture_data() { textureid = 0; twidth = 2048; }
int strx, stry, base_x, base_y;
texture_data() { textureid = 0; twidth = 2048; theight = 0; stretched = false; }
vector<color_t> texture_pixels;
color_t& get_texture_pixel(int x, int y) {
return texture_pixels[(y&(twidth-1))*twidth+(x&(twidth-1))];
return texture_pixels[(y&(theight-1))*twidth+(x&(twidth-1))];
}
vector<pair<color_t*, color_t>> undos;
@ -207,7 +210,7 @@ bool texture_data::loadTextureGL() {
// BGRA may be not supported in the web version
if(ISWEB) for(auto& p: texture_pixels) swap(part(p, 0), part(p, 2));
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, twidth, twidth, 0,
glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, twidth, theight, 0,
ISWEB ? GL_RGBA : GL_BGRA, GL_UNSIGNED_BYTE,
&texture_pixels[0] );
@ -219,7 +222,8 @@ bool texture_data::loadTextureGL() {
bool texture_data::whitetexture() {
undos.clear();
texture_pixels.resize(0);
texture_pixels.resize(twidth * twidth, 0xFFFFFFFF);
if(theight == 0) theight = twidth;
texture_pixels.resize(twidth * theight, 0xFFFFFFFF);
pixels_to_draw.clear();
return true;
}
@ -228,7 +232,6 @@ bool texture_data::readtexture(string tn) {
#if CAP_SDL_IMG || CAP_PNG
undos.clear();
texture_pixels.resize(twidth * twidth);
#if CAP_SDL_IMG
SDL_Surface *txt = IMG_Load(tn.c_str());
@ -298,32 +301,51 @@ bool texture_data::readtexture(string tn) {
printf("texture read OK\n");
#endif
if(twidth == 0)
twidth = next_p2(tx);
if(theight == 0) theight = stretched ? next_p2(ty) : twidth;
texture_pixels.resize(twidth * theight);
if(stretched) {
int i = 0;
println(hlog, tx, " -> " , twidth, " / " , ty, " -> ", theight);
for(int y=0; y<theight; y++)
for(int x=0; x<twidth; x++)
texture_pixels[i++] = pix(x * tx / twidth, y * ty / theight);
strx = twidth; stry = theight; base_x = base_y = 0;
}
if(tx == twidth && ty == twidth) {
else if(tx == twidth && ty == theight) {
int i = 0;
for(int y=0; y<ty; y++)
for(int x=0; x<tx; x++)
texture_pixels[i++] = pix(x, y);
strx = twidth; stry = theight; base_x = base_y = 0;
}
else {
origdim = max(tx, ty);
int base_x = tx/2 - origdim/2;
int base_y = ty/2 - origdim/2;
base_x = origdim/2 - tx/2;
base_y = origdim/2 - ty/2;
strx = twidth * tx / origdim;
stry = theight * ty / origdim;
qpixel_pixel_outside = 0; // outside is black
vector<int> half_expanded(twidth * ty);
for(int y=0; y<ty; y++)
scale_colorarray(origdim, twidth,
[&] (int x) { return pix(base_x + x,y); },
[&] (int x) { return pix(x - base_x,y); },
[&] (int x, int v) { half_expanded[twidth * y + x] = v; }
);
for(int x=0; x<twidth; x++)
scale_colorarray(origdim, twidth,
[&] (int y) { return base_y+y < 0 || base_y+y >= ty ? 0 : half_expanded[x + (base_y + y) * twidth]; },
[&] (int y) { return y-base_y < 0 || y-base_y >= ty ? 0 : half_expanded[x + (y-base_y) * twidth]; },
[&] (int y, int v) { get_texture_pixel(x, y) = v; }
);