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# Class CL_ProgramObject

OpenGL Program Object More...

Derived from: none
Derived by: none
Group: GL (Display 3D)

#include <ClanLib/gl.h>

Construction:

CL_ProgramObject | Construct OpenGL program object.

Attributes:

get_handle | Returns the OpenGL program object handle.
get_link_status | Returns true if the link succeeded.
get_validate_status | Returns true if validation succeeded.
get_shaders | Returns the shaders attached to the program object.
get_info_log | Returns the current info log for the program object.
get_attribute_count | Returns the count of active attributes.
get_attributes | Returns the active attributes.
get_attribute_location | Returns the location of a named active attribute.
get_uniform_count | Returns the count of active uniform variables.
has_uniform | Returns true if the uniform variable is present in the program.
get_uniforms | Returns a list of the active uniforms.
get_uniform_location | Returns the location of a named uniform variable.

Operations:

attach | Add shader to program object.
detach | Remove shader from program object.
bind_attribute_location | Bind attribute to specific location.
link | Link program.
validate | Validate program.
use | Start using the shader.
disable | Stop using the shader.
set_uniform | Set uniform variable(s).
set_uniform_matrix | Set uniform matrices.

Detailed description:

The shader objects that are to be used by programmable stages of OpenGL are collected together to form a program object. CL_ProgramObject is ClanLib's C++ interface to OpenGL program objects.

To construct a program object programatically, the procedure is as follows:

      CL_ShaderObject vertex_shader(cl_shadertype_vertex, vertex_glsl_sourcecode);
      CL_ShaderObject fragment_shader(cl_shadertype_fragment, fragment_glsl_sourcecode);
      CL_ProgramObject program;
      program.attach(vertex_shader);
      program.attach(fragment_shader);
      program.link();

For more information about program objects, see the OpenGL 2.0 specification at www.opengl.org. Documentation about the OpenGL Shader Language (GLSL) is also available from www.opengl.org.

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