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CHAPTER 9: User Interface
if (textureHandle[0] != 0) {
val options = BitmapFactory.Options().apply {
inScaled = false //
No pre-scaling
}
// Read in the resource
val bitmap = BitmapFactory.decodeResource(
context.getResources(),
resourceId, options)
// Bind to the texture in OpenGL
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D,
textureHandle[0])
//
Set filtering
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
GLES20.GL_TEXTURE_MIN_FILTER,
GLES20.GL_NEAREST)
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
GLES20.GL_TEXTURE_MAG_FILTER,
GLES20.GL_NEAREST)
// Load the bitmap into the bound texture.
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0,
bitmap, 0)
// The bitmap is no longer needed.
bitmap.recycle()
}else{
// TODO: handle error
}
return textureHandle[0]
}
In addition, the renderer gets new code for both the vertex and the fragment shader.
val vertexShaderCode = """
attribute vec4 vPosition;
attribute vec2 vTexture;
attribute vec4 vColor;
varying vec2 textureCoords;
varying vec4 fColor;
uniform mat4 uMVPMatrix;
void main() {
gl_Position = uMVPMatrix * vPosition;
textureCoords = vTexture;
fColor = vColor;
}
""".trimIndent()
