commonMain.ru.casperix.opengl.renderer.ShaderCompiler.kt Maven / Gradle / Ivy

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package ru.casperix.opengl.renderer

import ru.casperix.opengl.core.*
import ru.casperix.opengl.core.misc.GLErrorPrinter
import ru.casperix.opengl.core.misc.ShaderErrorParser

object ShaderCompiler {
    fun compile(vertexShaderSource: String, fragmentShaderSource: String): GLuint {
       val vertexShader =  compile(vertexShaderSource, GL_VERTEX_SHADER)
       val fragmentShader =  compile(fragmentShaderSource, GL_FRAGMENT_SHADER)

        val shaderProgram = glCreateProgram()

        glAttachShader(shaderProgram, vertexShader)
        glAttachShader(shaderProgram, fragmentShader)
        glLinkProgram(shaderProgram)

        val programSuccess = glGetProgrami(shaderProgram, GL_LINK_STATUS)
        if (programSuccess != 1) {
            throw Error("Invalid program")
        }

        glUseProgram(shaderProgram)
        glDeleteShader(vertexShader)
        glDeleteShader(fragmentShader)
        GLErrorPrinter.throwIfExist()
        return shaderProgram
    }

    private fun compile(shaderSource: String, type: GLenum): GLuint {
        val vertexShader = glCreateShader(type)
        glShaderSource(vertexShader, shaderSource)
        glCompileShader(vertexShader)
        val vertexShaderSuccess = glGetShaderi(vertexShader, GL_COMPILE_STATUS)
        if (vertexShaderSuccess != 1) {
            println(ShaderErrorParser.get(shaderSource, vertexShader))
            throw Error("Invalid shader:\n\n$shaderSource")
        }
        return vertexShader
    }
}