Re: [Opensg-users] OpenSG2: Accumulated changes... part 3: texture

2017-01-20 Thread Carsten Neumann 
Hello Johannes,

On 2017-01-20 03:45, Johannes wrote:
> I have reread these articles and I now tend to agree with you wrt to the
> LayeredTextureBuffer. However, the GL_TEXTURE_CUBE_MAP_ARRAY is missing
> nevertheless (?)

yes, looks like it is missing. I think it should make use of 
glFramebufferTexture for the cubemap array case though.

> This stuff is not easy to grasp. Most important for me is that I have
> the OpenSG primitives at hand that I need to translate my plain OpenGL
> shadow implementation into OpenSG land.

I think OSG::TextureBuffer is the one that should use 
glFramebufferTextureLayer (for cubemap array and similar cases) to make 
non-layer attachments. To me that seems in line with it's other uses 
where it binds a plain 2D image as the attachment.
Since you have a use case for these, you are likely in a much better 
position to verify changes. Can you adjust the changes to 
TextureBuffer/LayeredTextureBuffer to be in line with the above? Thanks!

Cheers,
Carsten

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Re: [Opensg-users] OpenSG2: Accumulated changes... part 3: texture

2017-01-20 Thread Johannes 
Hello Carsten,

first off, I'm not an expert with textures. First I will show you how I 
initialize my shadow maps in my plain OpenGL example. So that you 
understand what I want to map into OpenSG land.

Example: [1]

Next the sources I have studied:
https://www.khronos.org/opengl/wiki/Framebuffer_Object
https://www.khronos.org/opengl/wiki/Geometry_Shader#Layered_rendering

https://www.opengl.org/sdk/docs/man/html/glFramebufferTextureLayer.xhtml
https://www.opengl.org/sdk/docs/man/html/glFramebufferTexture.xhtml


I have reread these articles and I now tend to agree with you wrt to the 
LayeredTextureBuffer. However, the GL_TEXTURE_CUBE_MAP_ARRAY is missing 
nevertheless (?)

This stuff is not easy to grasp. Most important for me is that I have 
the OpenSG primitives at hand that I need to translate my plain OpenGL 
shadow implementation into OpenSG land.

Best,
Johannes


[1]
void OpenGLWindow::InitializeShadowFBO()
{
 if (_shadow_casters_point > 0)
 {
 glGenTextures(1, &_texture_shadow_array_point_id);
 glBindTexture(GL_TEXTURE_CUBE_MAP_ARRAY, 
_texture_shadow_array_point_id);

 glTexImage3D(
 GL_TEXTURE_CUBE_MAP_ARRAY,
 0,
 GL_DEPTH_COMPONENT,
 SHADOW_WIDTH,
 SHADOW_HEIGHT,
 6 * _shadow_casters_point,
 0,
 GL_DEPTH_COMPONENT,
 GL_FLOAT,
 nullptr);

 glTexParameteri (GL_TEXTURE_CUBE_MAP_ARRAY, 
GL_TEXTURE_MIN_FILTER,   GL_NEAREST);
 glTexParameteri (GL_TEXTURE_CUBE_MAP_ARRAY, 
GL_TEXTURE_MAG_FILTER,   GL_NEAREST);
 glTexParameteri (GL_TEXTURE_CUBE_MAP_ARRAY, GL_TEXTURE_WRAP_S, 
  GL_CLAMP_TO_EDGE);
 glTexParameteri (GL_TEXTURE_CUBE_MAP_ARRAY, GL_TEXTURE_WRAP_T, 
  GL_CLAMP_TO_EDGE);
 glTexParameteri (GL_TEXTURE_CUBE_MAP_ARRAY, GL_TEXTURE_WRAP_R, 
  GL_CLAMP_TO_EDGE);

 for (unsigned int i = 0; i < _shadow_casters_point * 6; i++)
 {
 GLuint fbo_id;
 glGenFramebuffers(1, _id);

 glBindFramebuffer(GL_FRAMEBUFFER, fbo_id);
 glFramebufferTextureLayer(GL_FRAMEBUFFER, 
GL_DEPTH_ATTACHMENT, _texture_shadow_array_point_id, 0, i);

 glDrawBuffer(GL_NONE);
 glReadBuffer(GL_NONE);

 glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }

 glBindTexture(GL_TEXTURE_CUBE_MAP_ARRAY, 0);
 }

 if (_shadow_casters_dir > 0)
 {
 glGenTextures(1, &_texture_shadow_array_dir_id);
 glBindTexture(GL_TEXTURE_2D_ARRAY, _texture_shadow_array_dir_id);

 glTexImage3D(
 GL_TEXTURE_2D_ARRAY,
 0,
 GL_DEPTH_COMPONENT,
 SHADOW_WIDTH,
 SHADOW_HEIGHT,
 _shadow_casters_dir,
 0,
 GL_DEPTH_COMPONENT,
 GL_FLOAT,
 nullptr);

 glTexParameteri (GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, 
GL_CLAMP_TO_BORDER);
 glTexParameteri (GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, 
GL_CLAMP_TO_BORDER);

 GLfloat borderColor[] = { 1.0, 1.0, 1.0, 1.0 };
 glTexParameterfv(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_BORDER_COLOR, 
borderColor);
 glTexParameteri (GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, 
GL_NEAREST);
 glTexParameteri (GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, 
GL_NEAREST);

 for (unsigned int i = 0; i < _shadow_casters_dir; i++)
 {
 GLuint fbo_id;
 glGenFramebuffers(1, _id);

 glBindFramebuffer(GL_FRAMEBUFFER, fbo_id);
 glFramebufferTextureLayer(GL_FRAMEBUFFER, 
GL_DEPTH_ATTACHMENT, _texture_shadow_array_dir_id, 0, i);

 glDrawBuffer(GL_NONE);
 glReadBuffer(GL_NONE);

 glBindFramebuffer(GL_FRAMEBUFFER, 0);
 }
 glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
 }
  }



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