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public class Renderer implents GLEventListener {
...
public int shaderProgram;
public int vertexShader;
public int fragmentShader;
...
@Override
public void init(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
shaderProgram = gl.glCreateProgram();
vertexShader = gl.glCreateShader(GL2.GL_VERTEX_SHADER);
fragmentShader = gl.glCreateShader(GL2.GL_FRAGMENT_SHADER);
// Compilation du vertex shader
String content = new String(Files.readAllBytes(Paths.get("vertexShader.glsl")), Charset.defaultCharset());
String[] shaderContent = new String[] { content };
gl.glShaderSource(vertexShader, 1, shaderContent, new int[] { shaderContent[0].length() }, 0);
gl.glCompileShader(vertexShader);
gl.glGetShaderiv(vertexShader, GL2.GL_COMPILE_STATUS, compiled, 0);
// Compilation du fragment shader
content = new String(Files.readAllBytes(Paths.get("fragmentShader.glsl")), Charset.defaultCharset());
shaderContent = new String[] { content };
gl.glShaderSource(fragmentShader, 1, shaderContent, new int[] { shaderContent[0].length() }, 0);
gl.glCompileShader(fragmentShader);
gl.glGetShaderiv(fragmentShader, GL2.GL_COMPILE_STATUS, compiled, 0);
// Ce n'est pas présent ici mais je vérifie bien évidemment la compilation de mes shaders avec gl.glGetShaderInfoLog
}
...
@Override
public void display(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
gl.glClear(GL2.GL_DEPTH_BUFFER_BIT | GL2.GL_COLOR_BUFFER_BIT);
gl.glEnable(GL2.GL_BLEND);
gl.glBlendFunc(GL2.GL_SRC_ALPHA, GL2.GL_ONE_MINUS_SRC_ALPHA);
gl.glViewport(0, 0, largeurEcran, hauteurEcran);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(45.0f, ratioEcran, nearClipping, farClipping);
glu.gluLookAt(...);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
// Je boucle ici sur tous les éléments à afficher
for (Element e : myElements) {
gl.glAttachShader(shaderProgram, vertexShader);
gl.glAttachShader(shaderProgram, fragmentShader);
gl.glLinkProgram(shaderProgram);
gl.glValidateProgram(shaderProgram);
gl.glUseProgram(shaderProgram);
gl.glBindAttribLocation(shaderProgram, 0, "inPosition");
gl.glBindAttribLocation(shaderProgram, 0, "inColor");
int projectionHandler = gl.glGetUniformLocation(vertexShader, "projection");
int viewHandler = gl.glGetUniformLocation(vertexShader, "view");
int worldHandler = gl.glGetUniformLocation(vertexShader, "world");
gl.glUniformMatrix4fv(projectionHandler, 1, false, projectionMatrix, 0);
gl.glUniformMatrix4fv(viewHandler, 1, false, viewMatrix, 0);
gl.glUniformMatrix4fv(worldHandler, 1, false, worldMatrix, 0);
// 'toutesLesTextures' contient les textures chargées à partir du fichier XML qui contient ma scène 3D
Texture texture = toutesLesTextures.get(element);
texture.bind(gl);
texture.enable(gl);
gl.glTexParameteri(GL2.GL_TEXTURE_2D, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_NEAREST);
gl.glTexParameteri(GL2.GL_TEXTURE_2D, GL2.GL_TEXTURE_MAG_FILTER, GL2.GL_LINEAR);
// Ici, je génère un vertex buffer et un index buffer (je ne le détaille pas)
gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL2.GL_COLOR_ARRAY);
gl.glEnableClientState(GL2.GL_TEXTURE_COORD_ARRAY);
gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, vertexBufferHandle);
gl.glBufferData(GL2.GL_ARRAY_BUFFER, vertexBuffer.capacity() * Buffers.SIZEOF_FLOAT, vertexBuffer, GL2.GL_STATIC_DRAW);
gl.glVertexPointer(3, GL.GL_FLOAT, Vertex.MEMORY_SIZE << 2, 0 << 2);
// Est-ce que je devrais utiliser glVertexAttribPointer plutôt que glColorPointer ? Ou alors aucune différence ?
gl.glColorPointer(4, GL.GL_FLOAT, Vertex.MEMORY_SIZE << 2, 6 << 2);
gl.glTexCoordPointer(2, GL.GL_FLOAT, Vertex.MEMORY_SIZE << 2, 10 << 2);
gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, indexBufferHandle);
gl.glBufferData(GL2.GL_ELEMENT_ARRAY_BUFFER, indexBuffer.capacity() * Buffers.SIZEOF_INT, indexBuffer, GL2.GL_STATIC_DRAW);
gl.glDrawElements(GL2.GL_TRIANGLES, indices.size(), GL2.GL_UNSIGNED_INT, 0);
gl.glBindBuffer(GL2.GL_ARRAY_BUFFER, 0);
gl.glBindBuffer(GL2.GL_ELEMENT_ARRAY_BUFFER, 0);
gl.glDisableClientState(GL2.GL_COLOR_ARRAY);
gl.glDisableClientState(GL2.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL2.GL_TEXTURE_COORD_ARRAY);
}
gl.glFlush();
...
}
@Override
public void dispose(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
gl.glUseProgram(0);
gl.glDetachShader(shaderProgram, vertexShader);
gl.glDetachShader(shaderProgram, fragmentShader);
gl.glDeleteShader(vertexShader);
gl.glDeleteShader(fragmentShader);
gl.glDeleteProgram(shaderProgram);
}
} |
