GlProgram

Kotlin |Java

@UnstableApi
class GlProgram

Represents a GLSL shader program.

After constructing a program, keep a reference for its lifetime and call delete (or release the current GL context) when it's no longer needed.

Summary

Public constructors
`GlProgram(vertexShaderGlsl: String!, fragmentShaderGlsl: String!)` Creates a GL shader program from vertex and fragment shader GLSL GLES20 code.
`GlProgram( context: Context!, vertexShaderFilePath: String!, fragmentShaderFilePath: String! )` Compiles a GL shader program from vertex and fragment shader GLSL GLES20 code.

Public functions
`Unit`	`bindAttributesAndUniforms()` Binds all attributes and uniforms in the program.
`Unit`	`delete()` Deletes the program.
`Int`	`getAttributeArrayLocationAndEnable(attributeName: String!)` Returns the location of an `Attribute`, which has been enabled as a vertex attribute array.
`Int`	`getUniformLocation(uniformName: String!)` Returns the location of a `Uniform`.
`Unit`	`setBufferAttribute(name: String!, values: FloatArray!, size: Int)` Sets a float buffer type attribute.
`Unit`	`setExternalTexturesRequireNearestSampling( externalTexturesRequireNearestSampling: Boolean )` Sets whether to sample external textures with GL_NEAREST.
`Unit`	`setFloatUniform(name: String!, value: Float)` Sets a `float` type uniform.
`Unit`	`setFloatsUniform(name: String!, value: FloatArray!)` Sets a `float[]` type uniform.
`Unit`	`setFloatsUniformIfPresent(name: String!, value: FloatArray!)` Sets a `float[]` type uniform if `name` is present, no-op otherwise.
`Unit`	`setIntUniform(name: String!, value: Int)` Sets an `int` type uniform.
`Unit`	`setIntsUniform(name: String!, value: IntArray!)` Sets a `int[]` type uniform.
`Unit`	`setSamplerTexIdUniform(name: String!, texId: Int, texUnitIndex: Int)` Sets a texture sampler type uniform.
`Unit`	`use()` Uses the program.

Public constructors

GlProgram

GlProgram(vertexShaderGlsl: String!, fragmentShaderGlsl: String!)

Creates a GL shader program from vertex and fragment shader GLSL GLES20 code.

This involves slow steps, like compiling, linking, and switching the GL program, so do not call this in fast rendering loops.

Parameters
`vertexShaderGlsl: String!`	The vertex shader program.
`fragmentShaderGlsl: String!`	The fragment shader program.

GlProgram

GlProgram(
    context: Context!,
    vertexShaderFilePath: String!,
    fragmentShaderFilePath: String!
)

Compiles a GL shader program from vertex and fragment shader GLSL GLES20 code.

Parameters
`context: Context!`	The `Context`.
`vertexShaderFilePath: String!`	The path to a vertex shader program.
`fragmentShaderFilePath: String!`	The path to a fragment shader program.

Throws
`java.io.IOException`	When failing to read shader files.

Public functions

bindAttributesAndUniforms

fun bindAttributesAndUniforms(): Unit

Binds all attributes and uniforms in the program.

Throws
`androidx.media3.common.util.GlUtil.GlException`

delete

fun delete(): Unit

Deletes the program. Deleted programs cannot be used again.

Throws
`androidx.media3.common.util.GlUtil.GlException`

getAttributeArrayLocationAndEnable

fun getAttributeArrayLocationAndEnable(attributeName: String!): Int

Returns the location of an Attribute, which has been enabled as a vertex attribute array.

Throws
`androidx.media3.common.util.GlUtil.GlException`

getUniformLocation

fun getUniformLocation(uniformName: String!): Int

Returns the location of a Uniform.

setBufferAttribute

fun setBufferAttribute(name: String!, values: FloatArray!, size: Int): Unit

Sets a float buffer type attribute.

setExternalTexturesRequireNearestSampling

fun setExternalTexturesRequireNearestSampling(
    externalTexturesRequireNearestSampling: Boolean
): Unit

Sets whether to sample external textures with GL_NEAREST.

The default value is false.

setFloatUniform

fun setFloatUniform(name: String!, value: Float): Unit

Sets a float type uniform.

setFloatsUniform

fun setFloatsUniform(name: String!, value: FloatArray!): Unit

Sets a float[] type uniform.

setFloatsUniformIfPresent

fun setFloatsUniformIfPresent(name: String!, value: FloatArray!): Unit

Sets a float[] type uniform if name is present, no-op otherwise.

setIntUniform

fun setIntUniform(name: String!, value: Int): Unit

Sets an int type uniform.

setIntsUniform

fun setIntsUniform(name: String!, value: IntArray!): Unit

Sets a int[] type uniform.

setSamplerTexIdUniform

fun setSamplerTexIdUniform(name: String!, texId: Int, texUnitIndex: Int): Unit

Sets a texture sampler type uniform.

Parameters
`name: String!`	The uniform's name.
`texId: Int`	The texture identifier.
`texUnitIndex: Int`	The texture unit index. Use a different index (0, 1, 2, ...) for each texture sampler in the program.

use

fun use(): Unit

Uses the program.

Call this in the rendering loop to switch between different programs.

Throws
`androidx.media3.common.util.GlUtil.GlException`