I'm playing around with the tutorial from Ultimate Game Programming about multitexturing. I'm also using Nehe's code as a base for all the Win32 stuff. When it displays the textures on the quad they are very dark. If I try using tga then its fine but these bitmaps are causing a problem. I know the simple answer is just to use tga but I want to know what the problem with bitmaps is.
Code for setting up textures:
memset(&texture_image, 0, sizeof(void *)*1);
if (texture_image = LoadBMP("nehe3.bmp")) {
status = TRUE;
glGenTextures(1, &texture[0]);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 3, texture_image->sizeX, texture_image->sizeY, 0, GL_RGB,
GL_UNSIGNED_BYTE, texture_image->data);
}
if (texture_image) {
if (texture_image->data)
free(texture_image->data);
free(texture_image);
}
status = FALSE;
memset(&texture_image, 0, sizeof(void *)*1);
if (texture_image = LoadBMP("crate.bmp")) {
status = TRUE;
glGenTextures(1, &texture[1]);
glBindTexture(GL_TEXTURE_2D, texture[1]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, 3, texture_image->sizeX, texture_image->sizeY, 0, GL_RGB,
GL_UNSIGNED_BYTE, texture_image->data);
}
Code for displaying and texturing quad:
glActiveTextureARB(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture[0]);
glActiveTextureARB(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, texture[1]);
glBegin(GL_QUADS);
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0f, 0.0f);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0f, 0.0f);
glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Texture and Quad
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0f, 0.0f);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0f, 0.0f);
glVertex3f( 1.0f, -1.0f, 1.0f); // Bottom Right Of The Texture and Quad
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 1.0f, 1.0f);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 1.0f, 1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Texture and Quad
glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0f, 1.0f);
glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0f, 1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Texture and Quad
glEnd();
glActiveTextureARB(GL_TEXTURE1_ARB);
glBindTexture(GL_TEXTURE_2D, NULL);
glActiveTextureARB(GL_TEXTURE0_ARB);
glBindTexture(GL_TEXTURE_2D, NULL);
