glColor3f(1.0f,0.0f,0.0f);
glEnable(GL_TEXTURE_2D);
//draw mask first, then draw real textures.
glEnable(GL_BLEND);
glBlendFunc(GL_DST_COLOR,GL_ZERO); // Set Blending Mask Cancels Screen Objects
glBindTexture(GL_TEXTURE_2D, textureMask); // Bind Our Texture (Mask Texture)
glBegin(GL_QUADS); // Begin Drawing Triangles
glTexCoord2f(1.0f,1.0f); glVertex3f( width/2,-height/2, 0.0f);
glTexCoord2f(0.0f,1.0f); glVertex3f(-width/2,-height/2, 0.0f);
glTexCoord2f(0.0f,0.0f); glVertex3f(-width/2, height/2, 0.0f);
glTexCoord2f(1.0f,0.0f); glVertex3f( width/2, height/2, 0.0f);
glEnd();
glBlendFunc(GL_ONE, GL_ONE); // Object Only Maps To Mask
glBindTexture(GL_TEXTURE_2D, texture); .
glBegin(GL_QUADS);
glTexCoord2f(1.0f,1.0f); glVertex3f( width/2,-height/2, 0.0f);
glTexCoord2f(0.0f,1.0f); glVertex3f(-width/2,-height/2, 0.0f);
glTexCoord2f(0.0f,0.0f); glVertex3f(-width/2, height/2, 0.0f);
glTexCoord2f(1.0f,0.0f); glVertex3f( width/2, height/2, 0.0f);
glEnd();
glDisable(GL_BLEND);
glDisable(GL_TEXTURE_2D);
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Mask & colour
Author
When I am trying to set my sprite with different colour, it will also display a coloured background, which shouldnt be there.
e.g. if i have a plane and its mask. If i don't set any colour. The plane will be drawn on the screen and other parts will be transparent. but if I want the plane to appear to be red, I use glColor3f(1.0f,0.0f,0.0f). Then the plane looks red, but then there will be a red square around it.
How will I get rid of the coloured background? Any suggestions?
Here is my code
[Edited by - daviddiligent on May 1, 2008 6:55:29 AM]
This topic is closed to new replies.
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