My texture Problem

Archy_Yu

I read data from a bmp file,and use it as a texture,but it just failed,which work well on others' computer,My code is no problem.Any help is appreciated .Thanks!

Cedric Moonen

Could you please give more explanation ? We don't even know how you are loading your texture, how you display it, ... Please post some (relevant) code too (and use the code block tag).

Cédric Moonen Software developer
Charting control [v2.0] OpenGL game tutorial in C++

Archy_Yu

unsigned int ID; /** < 生成纹理的ID号 */
int imageWidth; /** < 图像宽度 */
int imageHeight; /** < 图像高度 */
unsigned char *image; /** < 指向图像数据的指针 */
FILE *pFile = 0;

BITMAPINFOHEADER bitmapInfoHeader;
BITMAPFILEHEADER header;

unsigned char textureColors = 0;

pFile = fopen("桌面.bmp", "rb");
if(pFile == 0) return false;

fread(&header, sizeof(BITMAPFILEHEADER), 1, pFile);

if(header.bfType != BITMAP_ID)
{
fclose(pFile);
return false;
}

fread(&bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 1, pFile);

imageWidth = bitmapInfoHeader.biWidth;
imageHeight = bitmapInfoHeader.biHeight;

if(bitmapInfoHeader.biSizeImage == 0)
bitmapInfoHeader.biSizeImage = bitmapInfoHeader.biWidth *
bitmapInfoHeader.biHeight * 3;

fseek(pFile, header.bfOffBits, SEEK_SET);

image = new unsigned char[bitmapInfoHeader.biSizeImage];

fread(image, 1, bitmapInfoHeader.biSizeImage, pFile);

for(int index = 0; index < (int)bitmapInfoHeader.biSizeImage; index+=3)
{
textureColors = image[index];
image[index] = image[index + 2];
image[index + 2] = textureColors;
}

fclose(pFile);
glPixelStorei(GL_UNPACK_ALIGNMENT,1);

glGenTextures(1, &ID);

glBindTexture(GL\_TEXTURE\_2D, ID);

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);

gluBuild2DMipmaps(GL\_TEXTURE\_2D, 3, imageWidth, 
              imageHeight, GL\_RGB, GL\_UNSIGNED\_BYTE, 
              image);

glEnable(GL_TEXTURE_2D);
glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_REPLACE);

glPushMatrix();
glScaled(45.0,30.0,0);
glBindTexture(GL_TEXTURE_2D, ID);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-2.0f, -1.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-2.0f, 1.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.0f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 0.0f, -1.0f, 0.0f);

glEnd();
glPopMatrix();

GLvoid ReShapeGLScene( GLsizei width,GLsizei height )
{
glViewport(0,0,(GLsizei)width,(GLsizei)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho((GLdouble)-450.0,(GLdouble)450.0,(GLdouble)-300.0,(GLdouble)300.0,50.0,-10.0);
glMatrixMode(G

Cedric Moonen

What is your problem in fact ? Because you just said that it failed, that rather vague... Anyway I see you are using OpenGL, make sure that the width and height of your images are a power of 2.

Cédric Moonen Software developer
Charting control [v2.0] OpenGL game tutorial in C++