What is a Pixel Shader?

The pixel shader contains pixel shader instructions composed of ASCII text. Arithmetic instructions can be used to perform diffuse and / or specular lighting calculations.

Pixel shader

The pixel shader contains pixel shader instructions composed of ASCII text. Arithmetic instructions can be used to perform diffuse and / or specular lighting calculations.

Chinese name

Pixel shader

step 1

Check support for pixel shaders

Step 2

Declare vertex data

Step 3

Designing a pixel shader

Step 4

Create a pixel shader

Step 5

Rendering output pixels

Prior to Microsoft DirectX 8.0, Microsoft Direct3D used a fixed-function pipeline to convert 3D geometry into pixels on the screen. The user controls the way Direct3D transforms, lights, and renders pixels by setting the properties of the pipeline. The fixed-function vertex format is defined at compile time and determines the format of the input vertices. Once defined, the user can hardly control the change of the pipeline at runtime.

By allowing functions such as transforming vertices, lighting, and coloring each pixel, the shader takes the graphics pipeline to a new level. The pixel shader is a small program that

Texture

Step 1: Check support for pixel shaders. Step 2: Declare vertex data. Step 3: Design the pixel shader. Step 4: Create a pixel shader. Step 5: Render the output pixels. If the reader already knows how to build and run the Direct3D example, you can copy the code from this example and paste it into an existing application.

If the pixel shader is running, the following texture layer states will still be used. The use of these states depends on the version of the pixel shader, as shown in the following table.

Texture layer status	version
D3DTSS_BUMPENVMAT00	1_1-1_4
D3DTSS_BUMPENVMAT01	1_1-1_4
D3DTSS_BUMPENVMAT10	1_1-1_4
D3DTSS_BUMPENVMAT11	1_1-1_4
D3DTSS_BUMPENVLSCALE	1_1-1_3
D3DTSS_BUMPENVLOFFSET	1_1-1_3
D3DTSS_TEXCOORDINDEX	1_1-1_3. Only valid for fixed function vertex processing.
D3DTSS_TEXTURETRANSFORMFLAGS	1_1-1_3. Only valid for fixed function vertex processing.

If the pixel shader is running, the sampler state below will still be used.

Sampler status	version
D3DSAMP_ADDRESSU	All versions
D3DSAMP_ADDRESSV	All versions
D3DSAMP_ADDRESSW	All versions
D3DSAMP_BORDERCOLOR	All versions
D3DSAMP_MAGFILTER	All versions
D3DSAMP_MINFILTER	All versions
D3DSAMP_MIPFILTER	All versions
D3DSAMP_MIPMAPLODBIAS	All versions
D3DSAMP_MAXMIPLEVEL	All versions
D3DSAMP_MAXANISOTROPY	All versions
D3DSAMP_SRGBTEXTURE	All versions
D3DSAMP_ELEMENTINDEX	All versions
D3DSAMP_DMAPOFFSET	Vertex shader only (displacement map)

Because texture layer states are not part of the pixel shader, they are not available when the shader is compiled, so the driver cannot make any assumptions about them. For example, the driver could not distinguish between bilinear filtering and trilinear filtering at that time. The application is free to change these states without having to regenerate the currently bound shader.

Texture sampling and filtering operations are controlled by zoom in, zoom out, mip filtering, and surround addressing modes in standard texture layer states. For more information, see Texture Layer Status. Because the driver cannot get this information at compile time, the shader must be able to continue running after these states change. The application is responsible for setting the correct type of texture (two-dimensional) required by the pixel shader

Some other pixel operations-such as fog blending, stencil manipulation, and rendering target blending-occur after the shader executes. To support the new features described in this topic, the syntax for rendering target blending has been updated.

This example applies a texture map to a quad. The difference between this example and the previous example is:

Vertex data structures and FVF codes contain texture coordinates. Vertex data contains u, v data. Because the color of the pixels will be from the texture

This example puts the texture

Microsoft Visual Studio has an extension to support certain types of

Some graphics chip vendors provide shader debugging tools on their websites. These tools can be found by searching the Internet or reading the articles below. The reader can connect the debugger while the program is running, and use the debugger to step through the shader. By setting breakpoints, the reader can execute the shader code one line at a time and observe the changes in the register state. More information on vertex shaders and debugging tips.