FIRST I MUST LOAD TEXTURES FROM BMP MAP
void init2DTextures(GLuint* texName,char *texPath,GLint texUnit)
{
AUX_RGBImageRec *TextureImage[1];
memset(TextureImage,0,sizeof(void *)*1);
TextureImage[0]=LoadBMP(texPath);
glGenTextures(1, texName);
glBindTexture(GL_TEXTURE_2D, texName);
glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[0]->sizeX, TextureImage[0]->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[0]->data);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glActiveTexture(GL_TEXTURE0_ARB+texUnit);
if (TextureImage[0])
{
if (TextureImage[0]->data)
{
free(TextureImage[0]->data);
}
free(TextureImage[0]);
}
glEnable(GL_TEXTURE_2D);
}
init2DTexture function is based on NEHE and a pdf from 3dlabs.
Now I load 2 texture in main function as following:
init2DTextures(&tex[0],“0.bmp”,0);
init2DTextures(&tex[1],“1.bmp”,1);
I DO NOT think there is something wrong,i checked it for a long time, easy to use
but in my draw function as following:
void drawCube(void)
{
glTranslated(-1.0,-0.2,0.0);
glBegin(GL_QUADS);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 1.0);glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 1.0);
glVertex3f(0.0f,0.0f,0.0f);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 0.0);
glVertex3f(1.0f,0.0f,0.0f);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0, 0.0);glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 0.0);
glVertex3f(1.0f,1.0f,0.0f);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0, 1.0);glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0, 1.0);
glVertex3f(0.0f,1.0f,0.0f);
glEnd();
}
I want to draw a square covered by 2 texture with mixed color effect.
BIG BIG WORM OUT !
If I use glActiveTexture(GL_TEXTURE0_ARB+texUnit),I can only see the second bmp not with first bmp.
If I use glActiveTexture(GL_TEXTURE1_ARB+texUnit), I CAN SEE CORRECT PICTURE.
If I use glActiveTexture(GL_TEXTURE4_ARB+texUnit[even bigger number]), I can see only 1st BMP.
What’s the problem is ?
Thanks Thanks Thanks !