I just wanted to point out some driver bugs. I hunted them for 3 days. On my 780 everything works perfect.
Bug 1:
void glGetProgramResourceiv(GLuint program, GLenum programInterface, GLuint index, GLsizei propCount, const Glenum * props, GLsizei bufSize, GLsizei * length, GLint * params);
returns a negative number, when the property
props = GL_BUFFER_DATA_SIZE
is beeing queried for a
programInterface = GL_SHADER_STORAGE_BLOCK
which is larger than 64kb.
Up to 64kb it counts correctly, but with each byte you get higher, the number gets smaller again until it gets stuck at -16.
Bug 2:
glShaderStorageBlockBinding(...);
is beeing used to bind a shader storage buffer to a binding point of comput shader.
If I render (e.g. glDraw(...)) something with a program that has a fragment shader after glShaderStorageBlockBinding() gets called, all shader storage bindings get disconnected and you can't rebind them.
All shader storage reads return 0 from that point on.
If I comment out the draw call everything is fine again.
Here is my Java code. It uses my own library, but it's clear what it does.
InterfaceBlockBuffer sourceBuffer = new InterfaceBlockBuffer(resourcePool, "SourceBuffer", BUFFER_USAGE.DYNAMIC_DRAW);
InterfaceBlockBuffer destBuffer= new InterfaceBlockBuffer(resourcePool, "DestBuffer", BUFFER_USAGE.DYNAMIC_DRAW);
sourceBuffer.shaderStorageBlockBindingr(Bindings.BUF_SOURCE);
destBuffer.shaderStorageBlockBinding(Bindings.BUF_DEST);
sourceBuffer.bufferSubData(mySourceData);
// ***** If this is commented out - it works *****
Joogl.setProgram(renderProgram);
Joogl.setVertexArray(someVertexArray);
Joogl.draw(DRAW_MODE.TRIANGLE_FAN, 0, 4);
// ***********************************************
Joogl.setProgram(copyProgram); // Copy from sourceBuffer to destBuffer
Joogl.compute(MAX_FACES, 1, 1);
destBuffer.getBufferData(myDestData);
// print out myDestData ... on so on
//myDestData all zero when render call is beeing made
System:
Core i5 750
AMD Radeon 6950
Windows 7 64
Driver Version: 14.4
