opengl-es-2.0

I'm trying to implement a 2D outline shader in OpenGL ES2.0 for iOS. It is insanely slow. As in 5fps slow. I've tracked it down to the texture2D() calls. However, without those any convolution shader is undoable. I've tried using lowp instead of mediump, but with that everything is just black, although it does give another 5fps, but it's still unusable. Here is my fragment shader. varying mediump vec4 colorVarying; varying mediump vec2 texCoord; uniform bool enableTexture; uniform sampler2D texture; uniform mediump float k; void main() { const mediump float step_w = 3.0/128.0; const mediump

The Problem (TL;DR) My problem, fundamentally, is that I do not know how OpenGL ES 2.0 expects me to write and use multiple shaders; or if it is even advisable/expected that a person will do so. The fundamental question here is: if I have an apple, a glowing rock and a fuzzy mesh, all in the same 3D world, all best drawn with different shader programs but using the same mvpMatrix then how would I go about using all of them in the same OpenGL render such that they all use their most appropriate shaders that I have written? What Have I done So I have written a basic OpenGL ES 2.0 program for my

I'm working on a simple game for android using openGL es 2.0. Game will be in 2D, something like old supermario, where player can move left-right/up-down but no depth. Level will be larger than screen, so graphics will have to scroll. Here is where the problem comes. I don't know where/when to stop scrolling. Example. Lets say that background is 100x100 sized square with texture. Lets say that on screen there is only 1/4 of the background visible at any time. When I then move screen to the right, I would like it to stop scrolling when right edge of background comes at the edge of the screen.

this question is similar to something I asked here Android OpenGL ES 2: Introduction to VBOs however I tried multiple aproaches since then and I still haven't succeeded, so I think posting another question where I offer aditional details would be a better aproach. I am new to OpenGL ES 2 on Android (I have never worked with another OpenGL, I just need to draw something for an app I am developing for Android) and I would very much like to understand how to use VBOs. I tried to modify this OpenGL ES 2 for Android tutorial to use VBOs when drawing the triangle. I tried to use this step by step

This question has been asked before but the quite a few years ago in my searches. The answer was always to use texture mapping but what I really want to do is represent the star as a single vertex - you may think I'm copping out with a simplistic method but in fact, a single point source of light actually looks pretty good and realistic. But I want to process that point of light with something like a gaussian blur too give it a little more body when zooming in or for brighter stars. I was going to texture map a gaussian blur image but if I understand things correctly I would then have to draw