As I go along I will try to explain what I’m doing in my code, but I won’t go through my shader code line-by-line. Previous experience working with OpenGL (ES or otherwise) would be nice. But I’m guessing you are already familiar with Java if you are here. programming it shouldn’t be that hard to understand the code here. If you have experience with C/C++/Python/etc. Toggle Texturing: Can turn off texture mapping if there is an associated texture with the object (only the textured cube mesh).īefore you start reading this tutorial it would be useful if you have experience with:.off files) and Textured Cube Mesh (.obj file). Mesh switching: Can switch between an Octahedron, Tetrahedron (both.Shader switching: Can switch between Gouraud shading, phong shading and normal mapping.Toggle Light Rotation: Light rotation can be toggled through this option.Clicking the menu button on your phone allows you to: To rotate the mesh, and two fingers (pinch-to-zoom) to scale the mesh (though it’s not *perfect* ). There is a light rotating around the mesh. When the program starts you will see an octahedron mesh with Gouraud shading enabled. If it doesn’t my program quits without a warning. The program will only work if your phone supports OpenGL ES 2.0. NOTE: If your program is crashing with glError 1281 and you have a relatively new phone (a Samsung Galaxy S2 for example), change all dot() method calls in the shaders to dot2(). Normal Mapping: Gives a fake appearance of depth to a mesh.Sample textured cube mesh was exported from Blender. (.OBJ): Vertex positions, normals and texture coordinates are provided.My program will calculate per-vertex normals. (.OFF): These consist of only vertex positions.Mesh Loading:The program loads triangular meshes in these formats (as.I’ll first link to the apk, source code and the repository: Tutorials on how to write shaders for the Android platform are a little difficult to come by on the Internet, so I decided to work on a small but simple program which hopefully provides a simple framework to get started writing programs for OpenGL ES 2.0.

Opengl es 2.0 drawelements line