That''s too complicated for me. All I need to do is:
-Load a RBGA bitmap
-Mask out the alpha channel
I looked at the Alpha Blending tutorial (#32). Impossible to read.
Texture with a transparent color
wait, never mind. Photoshop 5.5 doesn''t save in RGBA bitmap format. I''ll just use the tga loading method.
Thanks very much gtlpcl.
Lessons 24,32, and 33 all have the TGA loading code, but I''d say that it''s explained best in #24.
Lessons 24,32, and 33 all have the TGA loading code, but I''d say that it''s explained best in #24.
yes, I got the code from #24, but I can''t find out how to use the texture I get. it''s something like:
glBindTexture(GL_TEXTURE_2D,textures[0].&imageData)
right?
glBindTexture(GL_TEXTURE_2D,textures[0].&imageData)
right?
Author
Hi,
Yes, you''re right, the function glBindTexture tells to the program which texture you eant to use, but your parameters are false.
First, I guess you use the structure Texture given by Nehe in his tutorials. If it''s the case, when you use the function glBindTexture, you use the value texture[0].texID and not imageData. imageData is empty now, after you attach an image to the Texture structure, you free this value (pointer to a part of memory) which is now obsolete (see the command imageData->free.)
Second, if you use the Texture structure as a pointer (ie you implement like this : Texture *texture), it''s not a point and/or ''&'' caracter for accessing value, but an array, like this : texture->texID
So, your source could seems like that :
glBindTexture(GL_TEXTURE_2D, texture[0].texID);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glEnd();
Remark : don''t forget to enable the textures.
Kind Regards.
PCL
Yes, you''re right, the function glBindTexture tells to the program which texture you eant to use, but your parameters are false.
First, I guess you use the structure Texture given by Nehe in his tutorials. If it''s the case, when you use the function glBindTexture, you use the value texture[0].texID and not imageData. imageData is empty now, after you attach an image to the Texture structure, you free this value (pointer to a part of memory) which is now obsolete (see the command imageData->free.)
Second, if you use the Texture structure as a pointer (ie you implement like this : Texture *texture), it''s not a point and/or ''&'' caracter for accessing value, but an array, like this : texture->texID
So, your source could seems like that :
glBindTexture(GL_TEXTURE_2D, texture[0].texID);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f);
glEnd();
Remark : don''t forget to enable the textures.
Kind Regards.
PCL
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