Hi, after I am now able to create fragshaders, they don't even look that bad, thx for help
But now I have been wondering about the vertexshader for about 13 hours
I just don't get why vec4(aVertex,0,1)* uModelMatrix != vec4(aVertex,0,1)
In my opinion uModelMatrix is an identity matrix so it should work.
I expected a red field, the mesh coords are set weird because I just would like to see a red pixel.
What I get:
Nothing, absolutely nothing is rendered
There's the code, you could compile and test it yourself if you want
+ downloadlink if you don't wanna grab the libs yourself:
http://www.file-upload.net/download-7008284/ErrorShader.rar.html1
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| import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.backends.lwjgl.LwjglApplication;
import com.badlogic.gdx.backends.lwjgl.LwjglApplicationConfiguration;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.Mesh;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.VertexAttribute;
import com.badlogic.gdx.graphics.VertexAttributes.Usage;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;
import com.badlogic.gdx.math.Matrix4;
public class ErrorShader implements ApplicationListener {
MeshHelper meshHelper;
public static void main(String[] args) {
LwjglApplicationConfiguration cfg = new LwjglApplicationConfiguration();
cfg.title = "Error";
cfg.useGL20 = true;
cfg.width = 500;
cfg.height = 500;
cfg.resizable = false;
new LwjglApplication(new ErrorShader(), cfg);
}
@Override
public void create() {
meshHelper = new MeshHelper();
meshHelper.createMesh(new float[] { -100.0f, -100.0f,
230.0f, 100.0f,
100f, 156.0f });
}
@Override
public void resize(int width, int height) {
}
@Override
public void render() {
Gdx.graphics.getGL20().glClearColor(0.2f, 0.2f, 0.2f, 1);
Gdx.graphics.getGL20().glClear(GL10.GL_COLOR_BUFFER_BIT);
Gdx.graphics.getGL20().glEnable(GL20.GL_BLEND);
meshHelper.drawMesh();
}
@Override
public void pause() {
}
@Override
public void resume() {
}
@Override
public void dispose() {
meshHelper.dispose();
}
}
class MeshHelper {
private Mesh mesh;
private ShaderProgram redShader;
private OrthographicCamera cam;
private Matrix4 modelMatrix;
public MeshHelper() {
createShader();
modelMatrix = new Matrix4();
cam = new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
for(int i =0; i< modelMatrix.getValues().length; i++){
System.out.println("values "+ i+": " + modelMatrix.getValues()[i]);
}
}
public void createMesh(float[] vertices) {
mesh = new Mesh(true, vertices.length, 0,
new VertexAttribute(Usage.Position, 2, "aVertex"));
mesh.setVertices(vertices);
}
public void drawMesh() {
if (mesh == null)
throw new IllegalStateException("drawMesh called before a mesh has been created.");
redShader.begin();
redShader.setUniformMatrix("uModelMatrix", modelMatrix);
mesh.render(redShader, GL20.GL_TRIANGLES);
redShader.end();
}
private void createShader() {
String vertexShader =
"attribute vec2 aVertex; \n"
+ "uniform mat4 uViewProjMatrix; \n"
+ "uniform mat4 uModelMatrix; \n"
+ "void main() \n"
+ "{ \n"
+ " gl_Position = vec4(aVertex,0,1)* uModelMatrix; \n" + "} \n";
String fragmentREDShader =
"#ifdef GL_ES\n" + "#define LOWP lowp\n" + "precision mediump float;\n" + "#else\n" + "#define LOWP \n" + "#endif\n" + "\n" +
"void main() {\n" +
" gl_FragColor = vec4(1.0,0.0,0.0, 1.0);\n" +
"}";
redShader = new ShaderProgram(vertexShader, fragmentREDShader);
if (redShader.isCompiled() == false)
throw new IllegalStateException(redShader.getLog());
}
public void dispose() {
mesh.dispose();
redShader.dispose();
}
} |
thx for help,
best regards
