2015-05-18 59 views
0

加載BMP存儲器中的BMP文件時出現問題。(幫助)加載BMP文件時出錯

很明顯,圖像加載的很好,但是當它被OpenGL程序顯示時看起來很糟糕。該程序不引發任何錯誤(這是在C++)

的代碼:

TEXTURE::TEXTURE(const char *path) { 
    unsigned char header[54]; 
    unsigned int dataPos; 
    unsigned int width, height, size; 
    unsigned char *data; 
    FILE *filePointer = fopen(path, "rb"); 

    if(filePointer == NULL) 
     printf_s("Error openning image file at '%s'!", path); 

    if(!fread(header, 1, 54, filePointer)) 
     printf_s("Error, file at '%s' isn't a real BMP file.", path); 

    if(header[0] != 'B' || header[1] != 'M') 
     printf_s("Error, file at '%s' isn't a real BMP file.", path); 

    dataPos = *(int *)&header[0x0A]; 
    size = *(int *)&header[0x22]; 
    width = *(int *)&header[0x12]; 
    height = *(int *)&header[0x16]; 

    if(!size) 
     size = width * height * 3; 

    if(!dataPos) 
     dataPos = 54; 

    data = new unsigned char[size]; 
    fread(data, 1, size, filePointer); 

    fclose(filePointer); 

    glGenTextures(1, &texID); 

    glBindTexture(GL_TEXTURE_2D, texID); 

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data); 

    glBindTexture(GL_TEXTURE_2D, 0); 
} 

結果(信息在圖像上是不重要的):

(I不能發表圖片...)http://i.stack.imgur.com/Ny2YD.jpg

原始圖像:http://k33.kn3.net/C/B/A/4/0/C/DB2.bmp

頂點着色器來源:

#version 330 core 

layout(location = 0) in vec4 position; 
layout(location = 1) in vec2 texCoords; 

out DATA { 
    vec2 texCoords; 
} vs_out; 

void main() { 
    gl_Position = position; 

    vs_out.texCoords = texCoords; 
} 

片段着色器源:

#version 330 core 

layout(location = 0) out vec4 color; 

in DATA { 
    vec2 texCoords; 
} fs_in; 

uniform sampler2D sampler; 

void main() { 
    color = texture(sampler, fs_in.texCoords); 
} 
+0

你知道文件內容是RGB,而不是RGBA嗎?此外,如果它確實是RGB,如果寬度不是4的倍數,則需要調用'glPIxelStorei(GL_UNPACK_ALIGNMENT,1)'。 –

+0

圖像大小爲512x512像素(非常完美)。我確定我將它保存爲24位BMP圖像(RGB)。 – Seyro97

+0

魔法藝術對我的代碼有意義!現在,沒有做任何事情,它做了正確的事情......非常感謝 – Seyro97

回答

0

嘗試使用SOIL庫 可以很容易地自動加載任何類型的圖像作爲紋理的,看到裏面test_SOIL.cpp例如,將是有益的