MeshSpecification

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open class MeshSpecification

kotlin.Any
↳	android.graphics.MeshSpecification

Class responsible for holding specifications for Mesh creations. This class generates a MeshSpecification via the MeshSpecification#make(Attribute[], int, Varying[], String, String) method, where multiple parameters to set up the mesh are supplied, including attributes, vertex stride, Varying, and vertex/fragment shaders. There are also additional methods to provide an optional ColorSpace as well as an alpha type. For example a vertex shader that leverages a Varying may look like the following:

Varyings main(const Attributes attributes) {
              Varyings varyings;
              varyings.position = attributes.position;
              return varyings;
         }
  

The corresponding fragment shader that may consume the varying look like the following:

float2 main(const Varyings varyings, out float4 color) {
              color = vec4(1.0, 0.0, 0.0, 1.0);
              return varyings.position;
       }
  

The color returned from this fragment shader is blended with the other parameters that are configured on the Paint object (ex. Paint#setBlendMode(BlendMode) used to draw the mesh. The position returned in the fragment shader can be consumed by any following fragment shaders in the shader chain. See https://developer.android.com/develop/ui/views/graphics/agsl for more information regarding Android Graphics Shader Language. Note that there are several limitations on various mesh specifications: 1. The max amount of attributes allowed is 8. 2. The offset alignment length is 4 bytes. 2. The max stride length is 1024. 3. The max amount of varyings is 6. These should be kept in mind when generating a mesh specification, as exceeding them will lead to errors.

Summary

Nested classes
open	Attribute Data class to represent a single attribute in a shader.
open	Varying Data class to represent a single varying variable.

Constants
static Int	ALPHA_TYPE_OPAQUE Pixel is opaque.
static Int	ALPHA_TYPE_PREMULTIPLIED Pixel components are premultiplied by alpha.
static Int	ALPHA_TYPE_UNKNOWN uninitialized.
static Int	ALPHA_TYPE_UNPREMULTIPLIED Pixel components are independent of alpha.
static Int	TYPE_FLOAT Represents one float.
static Int	TYPE_FLOAT2 Represents two floats.
static Int	TYPE_FLOAT3 Represents three floats.
static Int	TYPE_FLOAT4 Represents four floats.
static Int	TYPE_UBYTE4 Represents four bytes.

Public methods
open static MeshSpecification	make(attributes: Array<MeshSpecification.Attribute!>, vertexStride: Int, varyings: Array<MeshSpecification.Varying!>, vertexShader: String, fragmentShader: String) Creates a MeshSpecification object for use within Mesh.
open static MeshSpecification	make(attributes: Array<MeshSpecification.Attribute!>, vertexStride: Int, varyings: Array<MeshSpecification.Varying!>, vertexShader: String, fragmentShader: String, colorSpace: ColorSpace) Creates a MeshSpecification object.
open static MeshSpecification	make(attributes: Array<MeshSpecification.Attribute!>, vertexStride: Int, varyings: Array<MeshSpecification.Varying!>, vertexShader: String, fragmentShader: String, colorSpace: ColorSpace, alphaType: Int) Creates a MeshSpecification object.

Constants

Public methods