Now that I have shadow maps working, I'd like to add in ambient occlusion. I have all of the code in place, and I try to draw a fullscreen quad, but it's like the shader isn't called. The code is at https://github.com/sjhalayka/opengl4_stlview_shadow_map​

The relevant code is in main.cpp on line 342.

Any ideas?

@taby Try it:

glBindVertexArray(quad_vao);

glDisable(GL_CULL_FACE);

glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

glEnable(GL_CULL_FACE);

Sorry, but that has no effect. :(

@taby

1. could you add executable file of Visual Studio project ? I need RenderDoc capture, it can help
2. try to draw screen quad with VB/IB, instead of reading Vertex's Position inside Vertex's shader
3. try to comment all code except drawing of fullscreen's quad, may be problem in some GL state

Hi again, Andrey. I tried a few things, but I'm still stuck.

A reference SSAO code that works is at: https://github.com/sjhalayka/opengl4_stlview​

Thanks for your time!

@taby Hi.

glutInitContextVersion(3, 3);

glutInitContextProfile(GLUT_COMPATIBILITY_PROFILE);

glutInitContextProfile(GLUT_CORE_PROFILE); // need for RenderDoc, but doesn't work

I will continue later.

taby said:
and I try to draw a fullscreen quad, but it's like the shader isn't called

ssao.fs.glsl:

void main(void)

{

   // Get texture position from gl_FragCoord

   vec2 P = gl_FragCoord.xy / textureSize(sNormalDepth, 0);

   // ND = normal and depth

   vec4 ND = textureLod(sNormalDepth, P, 0);

   // Extract normal and depth

   vec3 N = ND.xyz;

   float my_depth = ND.w;   

   if(my_depth <= 1.0)

   {

       colour = textureLod(sColor, P, 0);

       return;

   }

colour = vec4(1.0f, 0.0, 0.0f, 1.0f);

}

you should simplify SSAO pixel shader to find problem. your shader called

Hi again Andrey,

Thanks for your help. Is there any chance that you could please upload your version of the code to a repository on GitHub?

@taby , Hi I'm going to upload my modification today, later

@taby , Hi https://github.com/Andreyogld3d/opengl4_stlview