Native Development

[Mungo]

Hi,

I am experiencing strange behaviour when trying to render lines under OpenGL ES 2.0 and using glLineWidth().

It works fine with a line width of 1.0, but everything wider just results in a filled shape with occasional screen flickering. According to GL_ALIASED_LINE_WIDTH_RANGE a line width of 1 to 7 should be supported.

I don't have my PlayBook yet so I only tested it on the simulator.

As this would be an instant show-stopper for me, could anybody else please confirm that this issue exists in the simulator or on the real device (or help me what I am doing wrong)?

My test program is as simple as this:

GLfloat vVertices[] = { 0.0f, 0.5f, 0.0f, -0.5f, -0.5f, 0.0f, 0.5f, -0.5f, 0.0f };

glUseProgram(simpleShader);

glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, vVertices);

glEnableVertexAttribArray(position);

glLineWidth(2.0);

glDrawArrays(GL_LINE_LOOP, 0, 3);

[guru2000at · Accepted solution]

I'm using glLineWidth(2.0f) without any flickering on the playbook. works fine

sample snippet:

		glEnableClientState(GL_VERTEX_ARRAY);
		glVertexPointer(2, GL_FLOAT, 0, pointsX);

		glLineWidth(2.0f);
		glDrawArrays(GL_LINE_STRIP, 0, numberOfPoints);

		glDisableClientState(GL_VERTEX_ARRAY);

[Mungo]

Thanks! It's (thankfully) really just a problem of the simulator.