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package at.hannibal2.skyhanni.utils.shader
import at.hannibal2.skyhanni.features.chroma.ChromaShader
import at.hannibal2.skyhanni.utils.LorenzUtils
import net.minecraft.client.Minecraft
import net.minecraft.util.ResourceLocation
import org.apache.commons.lang3.StringUtils
import java.io.BufferedReader
import java.io.InputStreamReader
/**
* Object to handle shaders for SkyHanni
*/
object ShaderManager {
/**
* For any future shaders add the object instance in this enum and
* in the when expression
*/
enum class Shaders(val shader: Shader) {
CHROMA(ChromaShader.INSTANCE);
companion object {
fun getShaderInstance(shaderName: String): Shader? = when (shaderName) {
"chroma" -> CHROMA.shader
else -> {
null
}
}
}
}
private val shaders: MutableMap<String, Shader> = mutableMapOf()
private var activeShader: Shader? = null
fun enableShader(shaderName: String) {
var shader = shaders[shaderName]
if (shader == null) {
shader = Shaders.getShaderInstance(shaderName)
if (shader == null) return
shaders[shaderName] = shader
}
activeShader = shader
shader.enable()
shader.updateUniforms()
}
fun attachShader(shaderProgram: Int, shaderID: Int) {
ShaderHelper.glAttachShader(shaderProgram, shaderID)
}
fun disableShader() {
if (activeShader == null) return
activeShader?.disable()
activeShader = null
}
fun loadShader(type: ShaderType, fileName: String): Int {
val resourceLocation = ResourceLocation("skyhanni:shaders/$fileName${type.extension}")
val source = StringBuilder()
val inputStream = Minecraft.getMinecraft().resourceManager.getResource(resourceLocation).inputStream
BufferedReader(InputStreamReader(inputStream)).forEachLine {
source.append(it).append("\n")
}
val shaderID = ShaderHelper.glCreateShader(type.shaderType)
ShaderHelper.glShaderSource(shaderID, source.toString())
ShaderHelper.glCompileShader(shaderID)
if (ShaderHelper.glGetShaderi(shaderID, ShaderHelper.GL_COMPILE_STATUS) == 0) {
LorenzUtils.consoleLog(
"Error occurred when compiling shader $fileName${type.extension} : " +
StringUtils.trim(ShaderHelper.glGetShaderInfoLog(shaderID, 1024))
)
}
return shaderID
}
}
enum class ShaderType(val extension: String, val shaderType: Int) {
VERTEX(".vsh", ShaderHelper.GL_VERTEX_SHADER),
FRAGMENT(".fsh", ShaderHelper.GL_FRAGMENT_SHADER)
}
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