Draw a 2D Image using OpenGL ES 2.0

Question

I\'ve been struggling to draw a 2D image from jpg/png files using openGL ES 2.0 for Android. Everywhere I look the tutorials are for texturing 3D images so its been rough figuri

Answer 1

The solution could be as simple as Enabling mTextureCoord... before assigning the VertexAttribPointer;

Answer 2

"v_TexCoordinate = a_TexCoordinate" +

should have been

"v_TexCoordinate = a_TexCoordinate;" +

Apparently I forgot a semi-colon, now I realize just how much I rely on my IDE's to tell me when I mess up stupid things haha.

Answer 3

I would also change this in the shader

  gl_Position = vPosition * uMVPMatrix;

to this

  gl_Position = uMVPMatrix * vPosition;

it will make a difference when trying to translate the position of the image.

Answer 4

Try with following Texture coordinates:

final float[] cubeTextureCoordinateData = {
0.5,-0.5, 0.5,0.5, -0.5,0.5, -0.5,-0.5 };

Its working. Thank you very much.

Answer 5

There is a mistake with variable vColor naming (or using) in fragmentShaderCode. Here your variable has name vColor:

uniform vec4 vColor;

and in this line it has name v_Color

gl_FragColor = (v_Color * texture2D(u_Texture, v_TexCoordinate));