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gapic/src/main/com/google/gapid/glviewer/geo/ObjWriter.java
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| @@ -0,0 +1,112 @@ | ||
| /* | ||
| * Copyright (C) 2017 Google Inc. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.google.gapid.glviewer.geo; | ||
|
|
||
| import java.io.IOException; | ||
| import java.io.Writer; | ||
|
|
||
| /** | ||
| * Writes {@link Model models} to OBJ files. | ||
| */ | ||
| public class ObjWriter { | ||
| private ObjWriter() { | ||
| } | ||
|
|
||
| public static void write(Writer out, Model model) throws IOException { | ||
| // TODO: could possibly make the OBJ smaller by deduping vertices and normals. | ||
| writePositions(out, model.getPositions()); | ||
| writeNormals(out, model.getNormals()); | ||
| out.write("s 1\n"); | ||
| switch (model.getPrimitive()) { | ||
| case Points: writePoints(out, model.getIndices()); break; | ||
| case Lines: writeLines(out, model.getIndices()); break; | ||
| case LineStrip: writeLineStrip(out, model.getIndices()); break; | ||
| case LineLoop: writeLineLoop(out, model.getIndices()); break; | ||
| case Triangles: writeTriangles(out, model.getIndices()); break; | ||
| case TriangleStrip: writeTriangleStrip(out, model.getIndices()); break; | ||
| case TriangleFan: writeTriangleFan(out, model.getIndices()); break; | ||
| default: throw new IOException("Unsupported draw primitive: " + model.getPrimitive()); | ||
| } | ||
| } | ||
|
|
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| private static void writePositions(Writer out, float[] pos) throws IOException { | ||
| for (int i = 2; i < pos.length; i += 3) { | ||
| out.write("v " + pos[i - 2] + " " + pos[i - 1] + " " + pos[i - 0] + "\n"); | ||
| } | ||
| } | ||
|
|
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| private static void writeNormals(Writer out, float[] normals) throws IOException { | ||
| for (int i = 2; i < normals.length; i += 3) { | ||
| out.write("vn " + normals[i - 2] + " " + normals[i - 1] + " " + normals[i - 0] + "\n"); | ||
| } | ||
| } | ||
|
|
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| private static void writePoints(Writer out, int[] indices) throws IOException { | ||
| for (int i : indices) { | ||
| out.write("p " + (i + 1) + "\n"); | ||
| } | ||
| } | ||
|
|
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| private static void writeLines(Writer out, int[] indices) throws IOException { | ||
| for (int i = 1; i < indices.length; i += 2) { | ||
| writeLine(out, indices[i - 1], indices[i - 0]); | ||
| } | ||
| } | ||
|
|
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| private static void writeLineStrip(Writer out, int[] indices) throws IOException { | ||
| for (int i = 1; i < indices.length; i++) { | ||
| writeLine(out, indices[i - 1], indices[i]); | ||
| } | ||
| } | ||
|
|
||
| private static void writeLineLoop(Writer out, int[] indices) throws IOException { | ||
| for (int i = 1; i < indices.length; i++) { | ||
| writeLine(out, indices[i - 1], indices[i]); | ||
| } | ||
| writeLine(out, indices[indices.length - 1], 0); | ||
| } | ||
|
|
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| private static void writeLine(Writer out, int a, int b) throws IOException { | ||
| out.write("l " + (a + 1) + " " + (b + 1) + "\n"); | ||
| } | ||
|
|
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| private static void writeTriangles(Writer out, int[] indices) throws IOException { | ||
| for (int i = 2; i < indices.length; i += 3) { | ||
| writeTriangle(out, indices[i - 2], indices[i - 1], indices[i - 0]); | ||
| } | ||
| } | ||
|
|
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| private static void writeTriangleStrip(Writer out, int[] indices) throws IOException { | ||
| for (int i = 2; i < indices.length; i += 3) { | ||
| writeTriangle(out, indices[i - 2], indices[i - 1], indices[i - 0]); | ||
| if ((i += 3) >= indices.length) { | ||
| break; | ||
| } | ||
| writeTriangle(out, indices[i - 1], indices[i - 2], indices[i - 0]); | ||
| } | ||
| } | ||
|
|
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| private static void writeTriangleFan(Writer out, int[] indices) throws IOException { | ||
| for (int i = 2; i < indices.length; i++) { | ||
| writeTriangle(out, indices[0], indices[i - 1], indices[i]); | ||
| } | ||
| } | ||
|
|
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| private static void writeTriangle(Writer out, int a, int b, int c) throws IOException { | ||
| out.write("f " + (a + 1) + "//" + (a + 1) + " " + (b + 1) + "//" + (b + 1) + | ||
| " " + (c + 1) + "//" + (c + 1) + "\n"); | ||
| } | ||
| } |
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