How can I make a 32 bit render target with a 16 bit alpha channel in DirectX?

Posted by J Junker on Game Development See other posts from Game Development or by J Junker
Published on 2011-06-21T17:31:02Z Indexed on 2011/06/22 0:33 UTC
Read the original article Hit count: 254

Filed under:

rendering

|

directx9

|

blending

I want to create a render target that is 32-bit, with 16 bits each for alpha and luminance. The closest surface formats I can find in the DirectX SDK are:

D3DFMT_A8L8   // 16-bit using 8 bits each for alpha and luminance.
D3DFMT_G16R16F   // 32-bit float format using 16 bits for the red channel and 16 bits for the green channel.

But I don't think either of these will work, since D3DFMT_A8L8 doesn't have the precision and D3DFMT_G16R16F doesn't have an alpha channel (I need a separate blend state for alpha).

How can I create a render target that allows a separate blend state for luminance and alpha, with 16 bit precision on each channel, that doesn't exceed 32 bits per pixel?

© Game Development or respective owner

Related posts about rendering

Optimizing transition/movement smoothness for a 2D flash game.

as seen on Stack Overflow - Search for 'Stack Overflow'
Update 6: Fenomenas suggested me to re-create everything as simple as possible. I had my doubts that this would make any difference as the algorithm remains the same, and performance did not seem to be the issue. Anyway, it was the only suggestion I got so here it is: 30 FPS: http://www.feedpostal… >>> More
iphone Rendering 3-D Object rendering

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I'm a beginner 3-D Quartz thing but knows how to create application. I was looking over sample of GLGravity Source code given by apple today, I was wondering teapot.h file contains all contents of array file such as indices, vertices. Do you guys think this code has been provided by human or… >>> More
Delay rendering or force re-rendering in Flex

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi there, In my Flex application, using a custom control, I am making a JSON request to grab some data from the server. My rendering depends on this data such as knowing how many boxes to draw. How can I either force the rendering to wait until I've got the data before drawing to screen or have the… >>> More
Rendering ASP.NET Script References into the Html Header

as seen on West-Wind - Search for 'West-Wind'
One thing that I’ve come to appreciate in control development in ASP.NET that use JavaScript is the ability to have more control over script and script include placement than ASP.NET provides natively. Specifically in ASP.NET you can use either the ClientScriptManager or ScriptManager to embed scripts… >>> More
Rendering in WebKit

as seen on Google Code - Search for 'Google Code'
Rendering in WebKit A deep dive into the guts of webkit. Eric Seidel explains the process from loading the resources, building the DOM tree, and the various trees involved in rendering. From: GoogleDevelopers Views: 4525 26 ratings Time: 34:45 More in Science & Technology >>> More

Related posts about directx9

Inter Quake Model IQM render Directx9

as seen on Game Development - Search for 'Game Development'
I'm trying to render an Inter Quake Model(http://lee.fov120.com/iqm/) in DirectX9 that I exported from blender. I want to display animations which IQM supports and my model format does not. The model is a cylinder. It loads fine in the iqm sdk opengl viewer but when i try to render it in directx9… >>> More
DirectX9 / HLSL Shader Model 3 - Passing Doubles between Shaders

as seen on Game Development - Search for 'Game Development'
I need higher precision on a few values within my vertex and pixel shaders...I'm currently using floats, so I would like to use doubles...I've read that HLSL Model 4 has two functions to convert a double into two unsigned integers and back again( asuint() and asdouble() ). These functions are only… >>> More
DirectX9 dynamic rendering

as seen on Game Development - Search for 'Game Development'
What I am planning to do is have the models (or maybe just an identifier for the model to be used) stored outside of the directX9 framework, and so in nature have completely dynamic rendering. All of the information that I have found contains static rendering (rendering models that are stored in… >>> More
"const char *" is incompatible with parameter of type "LPCWSTR" error

as seen on Game Development - Search for 'Game Development'
I'm trying to incorporate some code from Programming an RTS Game With Direct3D into my game. Before anyone says it, I know the book is kinda old, but it's the particle effects system he creates that I'm trying to use. With his shader class, he intialise it thusly: void SHADER::Init(IDirect3DDevice9… >>> More
DirectX11 Swap Chain RGBA vs BGRA Format

as seen on Game Development - Search for 'Game Development'
I was wondering if anyone could elaborate any further on something that's been bugging me. In DirectX9 the main supported back buffer formats were D3DFMT_X8R8B8G8 and D3DFMT_A8R8G8B8 (Both being BGRA in layout). http://msdn.microsoft.com/en-us/library/windows/desktop/bb174314(v=vs.85).aspx With… >>> More