public Renderer(
final String vShader, final String fShader, final String texture, final String meshName)
throws Exception {
final HashMap<String, Shader.Type> dat = new HashMap<>();
dat.put(vShader, Shader.Type.Vertex_Shader);
dat.put(fShader, Shader.Type.Fragment_Shader);
this.program = AssetManager.loadProgram(dat);
if (texture.equals("")) {
this.texture = -1;
} else {
this.texture = AssetManager.loadTexture(texture);
}
this.lastRot = new Quaternion();
this.lastPosition = new Vector3<>(0f, 0f, 0f);
this.lastSize = new Vector3<>(0f, 0f, 0f);
this.lastMat = Matrix4x4.identityMatrix();
this.mesh = AssetManager.loadMesh(meshName);
this.glPos = glGetUniformLocation(AssetManager.getProgram(this.program), "mv_matrix");
}
/**
* Renders the various attributes on screen
*
* @param size
* @param position
* @param rotMat
*/
public void render(
final Vector3<Float> size, final Vector3<Float> position, final Quaternion rotation) {
try {
boolean recalculate = false;
if (!size.equals(lastSize)) {
this.lastSize.set(size);
recalculate = true;
}
if (!this.lastPosition.equals(position)) {
this.lastPosition.set(position);
recalculate = true;
}
if (!this.lastRot.equals(rotation)) {
this.lastRot.set(rotation);
recalculate = true;
}
// Only do the calculations when it has been changed
if (recalculate) {
Matrix4x4 mat = Matrix4x4.identityMatrix();
mat = Matrix4x4.scale(mat, size);
Matrix4x4 pos = Matrix4x4.identityMatrix();
pos.translate(position);
mat = Matrix4x4.multiply(pos, mat);
this.lastMat.set(Matrix4x4.multiply(mat, Quaternion.quaternionToMatrix(rotation)));
}
glUseProgram(AssetManager.getProgram(this.program));
glBindVertexArray(AssetManager.getMeshVao(this.mesh));
glEnableVertexAttribArray(0);
glUniformMatrix4fv(this.glPos, true, this.lastMat.getRawData());
if (this.texture != -1) {
glBindTexture(GL_TEXTURE_2D, AssetManager.getTexture(this.texture));
}
glDrawArrays(GL_TRIANGLES, 0, AssetManager.getMeshSize(this.mesh));
glDisableVertexAttribArray(0);
glBindVertexArray(0);
} catch (AssetManager.AssetNotFoundException ex) {
Logger.getLogger(Renderer.class.getName()).log(Level.SEVERE, null, ex);
}
}
