0
現在、私は作成したマップを保存するための基本レベルエディタプログラムの機能を改良しています。それは生成されたマップの.bmpイメージを吐き出します。それは私がちょうどCImgと呼ばれるライブラリを介してこれを行います。すべてがうまくいくように見えますが、結果の.bmp画像は色が付いておらず、白黒の異なる色合いで表示されます。私が言ったように、私は基本的にライブラリについては何も知っていないので、ここで何が問題になるかも知れば、助けていただければ幸いです。ここでCImg画像は無色です
セーブ機能です：（TextureCoordのように）
void Map::Save() {
Vertex top_left_most, top_right_most, bottom_left_most;
int img_w = 0, img_h = 0;
std::vector<std::pair<GLuint, GLuint>>::iterator tl = bufferIDs.begin(); //This little block gives the _most variables valid starting vals
glBindBuffer(GL_ARRAY_BUFFER, tl->second);
glGetBufferSubData(GL_ARRAY_BUFFER, sizeof(TextureCoord), sizeof(Vertex), &top_left_most);
top_right_most = bottom_left_most = top_left_most;
for (auto i = bufferIDs.begin(); i != bufferIDs.end(); ++i) { //SEEKS TOP LEFT MOST TILE ON MAP
Vertex current_coord;
glBindBuffer(GL_ARRAY_BUFFER, i->second);
glGetBufferSubData(GL_ARRAY_BUFFER, sizeof(TextureCoord), sizeof(Vertex), ¤t_coord);
if ((current_coord.x < top_left_most.x && current_coord.y < top_left_most.y) ||
(current_coord.x == top_left_most.x && current_coord.y < top_left_most.y) ||
(current_coord.x < top_left_most.x && current_coord.y == top_left_most.y)) {
top_left_most = current_coord;
}
}
for (auto i = bufferIDs.begin(); i != bufferIDs.end(); ++i) { //SEEKS TOP RIGHT MOST TILE ON MAP
Vertex current_coord;
glBindBuffer(GL_ARRAY_BUFFER, i->second);
glGetBufferSubData(GL_ARRAY_BUFFER, sizeof(TextureCoord), sizeof(Vertex), ¤t_coord);
if ((current_coord.x > top_right_most.x && current_coord.y < top_right_most.y) ||
(current_coord.x == top_right_most.x && current_coord.y < top_right_most.y) ||
(current_coord.x > top_right_most.x && current_coord.y == top_right_most.y)) {
top_right_most = current_coord;
}
}
for (auto i = bufferIDs.begin(); i != bufferIDs.end(); ++i) { //SEEKS BOTTOM LEFT MOST TILE ON MAP
Vertex current_coord;
glBindBuffer(GL_ARRAY_BUFFER, i->second);
glGetBufferSubData(GL_ARRAY_BUFFER, sizeof(TextureCoord), sizeof(Vertex), ¤t_coord);
if ((current_coord.x < bottom_left_most.x && current_coord.y > bottom_left_most.y) ||
(current_coord.x == bottom_left_most.x && current_coord.y > bottom_left_most.y) ||
(current_coord.x < bottom_left_most.x && current_coord.y == bottom_left_most.y)) {
bottom_left_most = current_coord;
}
}
img_w = (top_right_most.x + 64) - top_left_most.x; //Calculating image dimensions for the buffer
img_h = (bottom_left_most.y + 64) - top_left_most.y;
GLuint *image = new GLuint[img_w * img_h]; //Creating the image buffer
int int_start_x = 0; //start_x and y that will be used in buffer pointer positioning computations
int int_start_y = 0;
//these nested fors fill the buffer
for (GLfloat start_y = top_left_most.y; start_y != bottom_left_most.y + 64; start_y += 64) {
for (GLfloat start_x = top_left_most.x; start_x != top_right_most.x + 64; start_x += 64) {
bool in_map = false;
std::vector<std::pair<GLuint, GLuint>>::iterator valid_tile;
for (auto i = bufferIDs.begin(); i != bufferIDs.end(); ++i) { //This for checks to see if tile corresponding to start_x & y is present in map
Vertex current_tile_pos;
glBindBuffer(GL_ARRAY_BUFFER, i->second);
glGetBufferSubData(GL_ARRAY_BUFFER, sizeof(TextureCoord), sizeof(Vertex), ¤t_tile_pos);
if (current_tile_pos.x == start_x && current_tile_pos.y == start_y) {
in_map = true;
valid_tile = i;
break;
}
}
GLuint *imagepos = image; //Repositioning the pointer into the final image's buffer
imagepos += int_start_x + (int_start_y * img_w);
if (in_map) { //if in map, that tile's texture is used to fill the corresponding part of the image buffer
GLuint *texture = new GLuint[64 * 64];
glBindTexture(GL_TEXTURE_2D, valid_tile->first);
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture);
GLuint *texturepos = texture;
for (GLuint ypos = 0; ypos != 64; ++ypos) {
std::memcpy(imagepos, texturepos, 64 * 4);
texturepos += 64;
imagepos += img_w;
}
if (texture)
delete[] texture;
}
else { //otherwise, a default all-black array is used to fill the corresponding untiled part of the image buffer
GLuint *black_buffer = new GLuint[64 * 64];
GLuint *blackpos = black_buffer;
GLuint solid_black;
char *p = (char *)&solid_black;
p[0] = 0;
p[1] = 0;
p[2] = 0;
p[3] = 255;
for (GLuint i = 0; i != 64 * 64; ++i) {
black_buffer[i] = solid_black;
}
for (GLuint ypos = 0; ypos != 64; ++ypos) {
std::memcpy(imagepos, blackpos, 64 * 4);
blackpos += 64;
imagepos += img_w;
}
if (black_buffer)
delete[] black_buffer;
}
int_start_x += 64;
}
int_start_x = 0;
int_start_y += 64;
}
cimg_library::CImg<GLuint> final_image(image, img_w, img_h); //no color!!
final_image.save_bmp("map.bmp");
if (image)
delete[] image;
}
いくつかの説明が参考になる場合は、Vertexは2 GLfloat秒の簡単なstructで、bufferIDsはGLuint秒のstd::pair秒のstd::vectorあり、第1のテクスチャはテクスチャIDを表し、第2のテクスチャはVBO IDを表す。ここで
は、要求されたサンプル画像です：あなたは、カラー画像を期待している場合には、単一チャネル・イメージを作成するため
what the image should look like (this is in monochrome)
Same exact image as above, but created using the reinterpret_cast method
