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      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.
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aprilspirit89

How to remove the black background of a .tga texture with alpha channel

3 posts in this topic

Recently,I'm trying to save the scene during rendering to .tga texture with alpha channel.When I did it,the whole picture seems darker than the way it looks on screen.Then I realise I should remove the background color which is default black.
[attachment=9517:rgb.jpg]
It‘s the same with Particle Illusion Software when it saves the alpha and give a choice whether to remove BG color. Here's my code.
[source lang="cpp"]
if(S_OK == pRenderSurface->LockRect(&rect,NULL,D3DLOCK_NO_DIRTY_UPDATE))
{
DWORD* pColor = (DWORD*)rect.pBits;
for( int y = 0 ; y < height ; y++ )
for(int x = 0 ; x < width ; x++ )
{
D3DXCOLOR color = pColor[y*rect.Pitch/4+x];
if(color.a > 0)
{
color.r /= color.a;
color.g /= color.a;
color.b /= color.a;
}
pColor[y*rect.Pitch/4+x]=color;
}
pRenderSurface->UnlockRect();
}
D3DXSaveSurfaceToFile(texPath1,D3DXIFF_TGA,pRenderSurface,NULL,NULL);
[/source]

Now the problem is,the picture seems too light,and some details lost.I'm confused about the result.Did I do it in a wrong way?[attachment=9516:problem.jpg]

What I want that Illusion Particle does
[attachment=9531:ball3.jpg] Edited by Tunisia hawker
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Hi,
it seems you lost part of your code during copy-paste. Line number 8 doesn't make sense and certainly wouldn't compile without errors.
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[quote name='Tom KQT' timestamp='1340026114' post='4950236']
Hi,
it seems you lost part of your code during copy-paste. Line number 8 doesn't make sense and certainly wouldn't compile without errors.
[/quote]
Thank you for pointing out my mistake.It looks OK during edit state,but some charactor just failed to show up.I guess it's
[source lang="cpp"]color.a < 1[/source] Edited by Tunisia hawker
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I came to realise maybe I should calculate the origin color each time when the draw call happens and any pixel get modified.Is that right?I just used method above but the color becomes brighter.Color buffer seems to have an explosion.small colorful paricles far away from each other are just alright,they only be written once.While the pixel in the central part are influenced by several particle systems,totally a mess. Edited by Tunisia hawker
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