我正在创建一个使用OpenGL 3.3的程序。我在程序中使用着色器，但它们似乎对我显示的三角形没有任何影响。他们正在加载和编译正常。
我在这里关注一个教程系列。
Tutorial3.scala：
import org.lwjgl.opengl.Display
import org.lwjgl.opengl.DisplayMode
import org.lwjgl.opengl.PixelFormat
import org.lwjgl.opengl.ContextAttribs
import org.lwjgl.opengl.GL11
import org.lwjgl.opengl.GL20
import org.lwjgl.opengl.GL15
import org.lwjgl.opengl.GL30
import org.lwjgl.BufferUtils
import utils.Shader
import utils.ShaderProgram
class Tutorial3(WIDTH: Int, HEIGHT: Int, TITLE: String) extends utils.Disposable {
/**
* Create an Int VBO for our triangle
*/
private var triangleVbo = 0
/**
* Create an Int VAO for our triangle
*/
private var triangleVao = 0
/**
* Create a Float array for storing our triangle's vertices. 3 vertices, containing 3 values each (x,y,z)
*/
private val triangleVertices: Array[Float] = new Array[Float](9)
/**
* Create a Float array for storing our trangle's colors
*/
private val triangleColors: Array[Float] = new Array[Float](9)
val vertexShader = new Shader()
val fragmentShader = new Shader()
val program = new ShaderProgram()
setupOpenGl
setupShapes
while(!Display.isCloseRequested()) {
loopCycle
Display sync 60
Display update
}
dispose
private def setupOpenGl() {
try {
val pixelFormat = new PixelFormat
val contextAttribs = new ContextAttribs(3, 3).withForwardCompatible(true).withProfileCore(true)
Display setDisplayMode new DisplayMode(WIDTH, HEIGHT)
Display setTitle TITLE
Display create (pixelFormat, contextAttribs)
GL11 glClearColor (1.0f, 0f, 0f, 1.0f)
} catch {
case e:Throwable => e printStackTrace; sys exit 1
}
}
private def setupShapes() {
//Triangle
triangleVertices(0) = -0.5f
triangleVertices(1) = -0.5f
triangleVertices(2) = 0f
triangleVertices(3) = 0.5f
triangleVertices(4) = -0.5f
triangleVertices(5) = 0f
triangleVertices(6) = 0f
triangleVertices(7) = 0.5f
triangleVertices(8) = 0f
//Colors
triangleColors(0) = 1.0f
triangleColors(1) = 0f
triangleColors(2) = 0f
triangleColors(3) = 0f
triangleColors(4) = 1.0f
triangleColors(5) = 0f
triangleColors(6) = 0f
triangleColors(7) = 0f
triangleColors(8) = 1.0f
val triangleBuffer = BufferUtils createFloatBuffer triangleVertices.length
triangleBuffer put triangleVertices
triangleBuffer flip ()
triangleVao = GL30 glGenVertexArrays ()
GL30 glBindVertexArray triangleVao
triangleVbo = GL15 glGenBuffers ()
GL15 glBindBuffer (GL15 GL_ARRAY_BUFFER, triangleVbo)
GL15 glBufferData (GL15 GL_ARRAY_BUFFER, triangleBuffer, GL15 GL_STATIC_DRAW)
GL20 glEnableVertexAttribArray 0
GL20 glVertexAttribPointer (0, 3, GL11 GL_FLOAT, false, 0, 0)
vertexShader loadShader ("vertex_shader_tutorial_3.glsl", GL20 GL_VERTEX_SHADER)
fragmentShader loadShader ("fragment_shader_tutorial_3.glsl", GL20 GL_FRAGMENT_SHADER)
program createProgram ()
program addShader vertexShader
program addShader fragmentShader
program linkProgram ()
program useProgram ()
GL15 glBindBuffer (GL15 GL_ARRAY_BUFFER, 0)
GL30 glBindVertexArray (0)
}
private def loopCycle() {
//Do Drawing / Logic
GL11 glClear (GL11 GL_COLOR_BUFFER_BIT)
GL30 glBindVertexArray triangleVao
GL20 glEnableVertexAttribArray 0
GL11 glDrawArrays(GL11 GL_TRIANGLES, 0, triangleVertices length)
GL20 glDisableVertexAttribArray 0
GL30 glBindVertexArray 0
}
override def dispose() {
GL20 glDisableVertexAttribArray 0
GL15 glBindBuffer (GL15 GL_ARRAY_BUFFER, 0)
GL15 glDeleteBuffers triangleVbo
GL30 glBindVertexArray 0
GL30 glDeleteVertexArrays triangleVao
Display destroy
}
}
object Tutorial3 {
def main(args: Array[String]) {
new Tutorial3(800, 600, "OpenGL 3.3 Tutorial 3")
}
}
着色器.scala：
package utils
import java.io.File
import java.io.BufferedReader
import java.io.FileReader
import org.lwjgl.opengl.GL30
import org.lwjgl.opengl.GL15
import org.lwjgl.opengl.GL11
import org.lwjgl.opengl.GL20
class Shader extends Disposable {
private var shader: Int = 0
private var typ: Int = 0
private var loaded: Boolean = false
def loadShader(filename: String, typ: Int): Boolean = {
val file: File = new File(System getProperty "user.dir", filename)
if(!file.exists())
false
var line: String = ""
val reader: BufferedReader = new BufferedReader(new FileReader(file))
var shaderSource: String = ""
while({line = reader.readLine(); line != null}) {
shaderSource = shaderSource + line + "\n"
}
reader close
this.shader = GL20 glCreateShader typ
GL20 glShaderSource (this.shader, shaderSource)
GL20 glCompileShader this.shader
val status: Int = GL20 glGetShaderi(this.shader, GL20 GL_COMPILE_STATUS)
if(status != 1)
false
this.typ = typ
this.loaded = true
true
}
def isLoaded(): Boolean = {
this.loaded
}
def getShaderId(): Int = {
this.shader
}
override def dispose() {
GL20 glDeleteShader this.shader
}
}
ShaderProgram.scala：
package utils
import org.lwjgl.opengl.GL20
class ShaderProgram extends Disposable {
private var program: Int = 0
private var linked: Int = 0
def createProgram() {
program = GL20 glCreateProgram
}
def useProgram() {
GL20 glUseProgram this.program
}
def addShader(shader: Shader): Boolean = {
GL20 glAttachShader(this.program, shader getShaderId)
shader isLoaded
}
def linkProgram(): Boolean = {
GL20 glLinkProgram this.program
this.linked = GL20 glGetProgrami (this.program, GL20 GL_LINK_STATUS)
this.linked != 0
}
def getProgramId(): Int = {
this.program
}
override def dispose() {
GL20 glDeleteProgram this.program
}
}
顶点着色器：
#version 330
layout (location = 0) in vec3 inPosition;
layout (location = 1) in vec3 inColor;
smooth out vec3 theColor;
void main() {
gl_Position = vec4(inPosition, 1.0);
theColor = inColor;
}
片段着色器：
#version 330
smooth in vec3 theColor;
out vec4 outColor;
void main() {
outColor = vec4(theColor, 1.0);
}
什么可能导致着色器不生效？