Question

What is the best approach for drawing a Line with a specific texture?

Right now I’m attempting to draw a Line with a texture by simply drawing lines instead of another Primitive.

    setupMandatoryHandlers(shader);

    GLES20.glEnableVertexAttribArray(positionHandler);
    GLES20.glVertexAttribPointer(positionHandler, COORDS, GLES20.GL_FLOAT, false, STRIDE, vertexBuffer);

    if (texture != null)
        setupTextureData();     

    GLES20.glUniform4fv(colorHandler, 1, color, 0);

    GLES20.glUniformMatrix4fv(MVPMatrixHandle, 1, false, orthoMatrix, 0);       
    GLES20.glDrawElements(drawType, indices.length, GLES20.GL_UNSIGNED_SHORT, indexBuffer);

    GLRenderer.CheckGLError("Draw Elements");       

    GLES20.glDisableVertexAttribArray(positionHandler);

    if (texture != null)
        GLES20.glDisableVertexAttribArray(texCoordHandler);

Is this the most efficient way of drawing lines with textures or should I be looking somewhere else? Should I use glDrawArrays instead of glDrawElements for lines?

Answer 1

To draw a texture on a line you either have to use PointSprites or draw small textured Quads. In my case I used Triangle_Strips and textured those because the line in my case could be small and still look exactly like a line.

If anyone has a better solution or has implemented the above feel free to post an answer!