[英]CImg Image is Colorless
目前,我正在完善基本級別編輯器程序中的功能,該功能允許我保存創建的地圖。 它吐出所生成地圖的.bmp圖像。 它通過我剛剛發現的名為CImg的庫來執行此操作,而我幾乎一無所知。 一切似乎正常,但是生成的.bmp圖像未着色,而是以不同的黑白陰影顯示。 就像我說的那樣,我基本上對庫一無所知,因此,如果您知道問題可能出在這里,我將不勝感激。
這是保存功能:
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;
}
如果有一些解釋會有所幫助,則Vertex
是兩個GLfloat
的簡單struct
( TextureCoord
), bufferIDs
是GLuint
的std::pair
的std::vector
,第一個表示紋理ID,第二個表示紋理ID代表VBO ID。
以下是所需的示例圖像:
你的線
cimg_library::CImg<GLuint> final_image(image, img_w, img_h);
如果您期望彩色圖像,那是錯誤的,因為它會創建一個單通道圖像。 您最后需要3個才能制作3個通道-一個用於紅色,一個用於綠色,一個用於藍色。
同樣,您的數據存儲在GLuint
,這意味着將像這樣存儲4x2像素的圖像,即按像素逐行交錯 :
RGBA RGBA RGBA RGBA
RGBA RGBA RGBA RGBA
而CImg希望以帶交錯的平面方式存儲它:
RRRRRRRR
GGGGGGGG
BBBBBBBB
AAAAAAAA
此鏈接說明CImg內存緩沖區的布局。
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