textures

Can I have Stencil prepared with a texture (Image) in OpenGL 2.0 So that some part of the Image will be transparent and as a result it will be transfered as is to Stencil buffer and then will use this use this stencil buffer for further drawing. EDIT by datenwolf to account for OPs question update in a answer: By @InfiniteLoop: @datenwolf thanks a lot for ur reply but no success :( here is my code - (void)render { [EAGLContext setCurrentContext:context]; glBindFramebuffer(GL_FRAMEBUFFER, defaultFramebuffer); glUseProgram(program); glClearColor(0, 104.0/255.0, 55.0/255.0, 1.0); glViewport(0, 0,

I want to change the some texels in a OpenGL texture for a given location. Can anyone help me with this pls ? This is the functionnality that I want, void ChangeTexelColor(int x, int y, GLuint id, int texW, int texH, GLenum format) { //What is here ? } This will use to maintain the minimap of my game (if anyone have a better idea of maintaining a dynamic map-texture-). Btw, this must done fast. Thanks. OpenGL has the glTexSubImage2D function, which is exactly for your purpose. Here's a functions that changes the color of one texel: void changeTexelColor(GLuint id, GLint x, GLint y, uint8_t r,

Everyone, I'm trying to animate a Canvas-based texture that is mapped onto a plane, like a billboard. I've made a point of including material.needsUpdate & texture.needsUpdate , but I'm still unable to get the texture to come to life. I've also included a rotating cube just so I know the animation routine is functioning on some level. Here is the code: if ( window.innerWidth === 0 ) { window.innerWidth = parent.innerWidth; window.innerHeight = parent.innerHeight; } var camera, scene, renderer; var mesh, geometry, material; var light, sign, animTex; var canvas, context; init(); animate();

I'm getting the error [.WebGLRenderingContext]RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering or is not 'texture complete' when I run my web app in dartium. I've been trying to troubleshoot this issue for two days, including a full rewrite of the code, But I can't isolate the issue. I think the problem lies in this piece of code, however. void main() { ... var texture = gl.createTexture(); var image = new ImageElement(); image.onLoad.listen((e) { gl.bindTexture(webGL.TEXTURE_2D, texture); gl.texImage2DImage

I've been trying to figure out how to use float textures in GLES2. The API Reference ( http://www.khronos.org/opengles/sdk/docs/man/glTexImage2D.xml ) says that only unsigned bytes and shorts can be used, but i've seen people saying it is supported elsewhere. I could use GL_LUMINANCE as the texture format but that only gets me one float value. If anyone has some insight i'd appreciate it. In OpenGL ES 2.0, floating-point textures are only supported if the implementation exports the OES_texture_float extension. Note that this extension only allows nearest filtering within a texture level, and

I'm using defered rendering in my application and i'm trying to create a texture that will contain both the depth and the stencil. glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH24_STENCIL8, width, height, 0, ???, GL_FLOAT, 0); Now what format enum does opengl want for this particular texture. I tried a couple and got error for all of them Also, what is the correct glsl syntax to access the depth and stencil part of the texture. I understand that depth texture are usually uniform sampler2Dshadow. But do I do float depth = texture(depthstenciltex,uv).r;// <- first bit ? all 32 bit ? 24 bit ? float