• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.

Archived

This topic is now archived and is closed to further replies.

shizik

novice gl question

7 posts in this topic

hello, I am trying to create a simple sprite based game and am having a problem my sprites are quads textured with the bitmap of the sprite. I was able to make the black background around the sprite be transparent by: glEnable(GL_TEXTURE_2D); glEnable(GL_BLEND); glBlendFunc(GL_SRC_ALPHA,GL_ONE); glBindTexture(GL_TEXTURE_2D, texture[0]); glBegin(GL_QUADS); glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,-1.0f, 0.0f); glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f,-1.0f, 0.0f); glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 0.0f); glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 0.0f); glEnd(); glDisable(GL_BLEND); now when I compose my scene I want my sprites to be on the foreground and lets say a bunch of points or quads on the background, I have enabled depth-testing, but my background objects are always overwriting my sprites, NO MATTER what their Z position is whats going on?
0

Share this post


Link to post
Share on other sites
I believe what you''ll want to do is draw all of your background objects first, making sure that GL_DEPTH_TEST is enabled.

Then draw your sprites with GL_DEPTH_TEST disables. I believe this will fix your problem.. let me know
0

Share this post


Link to post
Share on other sites
neither of these two solutions work

when I set the backgorund to green, it seems that the texture on my sprite is being blended with the background color
why is this happening?

anything I draw seems to superimpose itself over my sprite
even if I draw it before the sprite and behind the sprite

any ideas?
thanks
0

Share this post


Link to post
Share on other sites
I would personally use .tga files for sprites cuz of the alpha channel in them and use
glAlphaFunc(GL_GREATER, 0.1f);
glEnable(GL_ALPHA_TEST);
That will make everything that is black (in the alpha channel in the tga file) not appear if ya need more help be glad to help ya.
0

Share this post


Link to post
Share on other sites
quote:
Original post by shizik
when I set the backgorund to green, it seems that the texture on my sprite is being blended with the background color
why is this happening?

anything I draw seems to superimpose itself over my sprite
even if I draw it before the sprite and behind the sprite


Why didn''t you say that in the first place? That''s different than what I though you meant .

[Resist Windows XP''s Invasive Production Activation Technology!]
0

Share this post


Link to post
Share on other sites
I''m just beginning in OpenGL, so correct me if I''m wrong, but can''t you disable blending or use some sort of masking to accomplish your intended effect?

Oh, and how are you guys doing the "quote: HR ''whatever'' HR"? Does this form even support HTML?
0

Share this post


Link to post
Share on other sites
Yes this form supports html tags. To make a quote-thingy you write:

[ quote ]
Quoted text here
[ /quote ]
But without spaces within the [ and ] brackets.

Or you can simply click the little "quote"-link in the top-right corner of a post. (clicking the "quote" or "edit" links on a post containing special tags is a good way to see how to write them).

Edited by - Dactylos on October 19, 2001 9:42:00 AM
0

Share this post


Link to post
Share on other sites