Part of the Khronos Group
OpenGL.org

The Industry's Foundation for High Performance Graphics

from games to virtual reality, mobile phones to supercomputers

Search:

Type: Posts; User: guihazan

Search: Search took 0.00 seconds.

  1. Replies
    2
    Views
    1,601

    drawing antialiased line on OpenGL ES 2

    Hi,

    As the topic says, i want to draw an antialiased line on OpenGL ES 2. Note that the glHint only accepts GL_GENERATE_MIPMAP_HINT in GLES2.

    Any help is greatly appreciated.

    guich
  2. Replies
    4
    Views
    1,975

    There's no stippling in Open GL ES 2... :-(

    There's no stippling in Open GL ES 2... :-(
  3. Replies
    4
    Views
    1,975

    Hi, thanks. Is this the same approach used to...

    Hi, thanks. Is this the same approach used to draw an antialiased line?
  4. Replies
    4
    Views
    1,975

    how to draw a dashed line in open gl es 2?

    Hi,

    I'm trying to do that but it doesn't work. This is the fragment code i tried:

    "precision mediump float;" \
    "uniform vec4 a_Color; bool on; " \
    "void main() {gl_FragColor...
  5. Replies
    0
    Views
    759

    drawing a point with a GL_TRIANGLE

    Hi,

    I came across a problem in Galaxy Tab 2 with Android 4.0.4 using Open GL ES 2: it does not draw correctly when using GL_POINTS or GL_LINES, only with GL_TRIANGLES*. The coordinates for the...
  6. Found the problem! Have to set the gl_PointSize...

    Found the problem! Have to set the gl_PointSize to 1.0.

    #define LRP_VERTEX_CODE \
    "attribute vec4 a_Position;" \
    "uniform mat4 projectionMatrix;" \
    "void main() {gl_PointSize...
  7. Is there any kind of parameter that would make...

    Is there any kind of parameter that would make opengl es 2 clip a single pixel?
  8. in galaxy tab 2, draw line with 2 points work but with 1 point not

    I'm now getting a strange problem. I have a gl2 program that draws a
    point. It works in the sony xperia S (android 2.3.7) but not in the samsung galaxy tab 2. This is the code:



    #define...
  9. Hi mhagain, I thought about another solution,...

    Hi mhagain,

    I thought about another solution, but i don't know how to implement it.

    vec4 color = (r,g,b,1);
    vec4 alpha = (1,1,1,a);

    v_Color = color * alpha;

    Is it possible?
  10. changing only the alpha-channel of a set of colors

    Hi,

    I have a shader that is used to draw a font. I know that people use texture to draw points, but here the point drawing shader is so fast that it does not make a difference to change it to...
  11. Found the problem: i was calling...

    Found the problem: i was calling glVertexAttribPointer with incorrect value in the 2nd parameter.
  12. using if/else to select between single or multiple colors

    Hi,

    I'm trying to create a single program to draw a point/line/rectangle and point array. The code is below:



    #define COORDS_PER_VERTEX 3

    GLfloat ftransp[16], f255[256];
  13. Replies
    6
    Views
    2,162

    You were right! Removing the line made the code...

    You were right! Removing the line made the code work without such error.

    Something i cant understand is about the state changes. What is and what is not stored in the program when you call...
  14. Replies
    6
    Views
    2,162

    Hi, Here's the code: #define...

    Hi,

    Here's the code:



    #define TEXTURE_VERTEX_CODE \
    "uniform vec4 uTextureColor;" \
    "attribute vec4 vertexPoint;" \
    "attribute vec2 aTextureCoord;" \
  15. Replies
    6
    Views
    2,162

    using multiple programs in open gl es 2

    Hi,

    Is there any online sample that shows how to use two or more gles2 programs (using glUseProgram)? I'm getting strange errors when i try to do that here.

    thanks in advance,

    guich
  16. Replies
    3
    Views
    1,589

    How can i render directly to a texture instead of...

    How can i render directly to a texture instead of rendering to the buffer? I'm using EGL.

    thanks!

    guich
  17. Replies
    3
    Views
    1,589

    transition effects using opengl es 2

    Hi,

    I'm targetting Android and iOS OpenGL ES 2.

    How can i create a transition effect using double-buffering? I would like to change from a screen to another one using something like stripes.
    ...
  18. Replies
    1
    Views
    925

    drawing using xor

    Hi,

    Can someone give me some insight of how to draw xor lines using opengl? A xor line is a line used for cursor positioning, where xor'ing two times the same place returns to the original colors....
  19. Partly update the screen or copying buffers

    Hi,

    My application updates the whole screen frequently, but there are a few situations that updates only a very small part of the screen.

    I already tried to use glScissor and/or glViewport to...
  20. Replies
    1
    Views
    860

    using single-buffering in GLES 2

    Hi,

    Is it possible to use a single buffer in opengl ES 2? I'm using eglSwapBuffers, but i would like to use a single buffer.

    thanks

    guich
  21. platform-independent way of loading images into textures in GLES 2

    Hi,

    I have a program where i dynamically create images in an offscreen buffer. I was using glDrawPoints to map each image pixel but it is rather slow, so i'm now searching a way to load and draw...
  22. Set vertex position and color at the same time

    Hi,

    I would like to set the vertex position and color at the same time.

    My opengl2 codes are:



    // http://www.songho.ca/opengl/gl_projectionmatrix.html
    static char* vertexShaderCode =...
  23. Replies
    4
    Views
    2,549

    Hi, That was the problem. Using 12 (as each...

    Hi,

    That was the problem. Using 12 (as each coordinate has 3 floats * 4 bytes per float) it works!

    thanks!!!
  24. Replies
    4
    Views
    2,549

    Hi, It doesnt work. In the more simple code...

    Hi,

    It doesnt work. In the more simple code below:



    final int COORDS_PER_VERTEX = 3;
    float[] letter; int nletter;
    private FloatBuffer letBuffer;
    private void drawText()
  25. Replies
    4
    Views
    2,549

    GL_POINTS not drawing points in Android

    Hi,

    I posted this on android forum but i'm sure that this forum is a better place to post this question.

    I've spent a full day trying to draw a series of points using GL_POINTS. I know i could...
Results 1 to 25 of 25