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FastUIDraw
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If one wishes to make use of other PainterBrushShaderGLSL fastuidraw_gl_vert_brush_main()/fastuidraw_gl_frag_brush_main() of other shaders (for example to have a simple shader that adds on to a previous shader), a DependencyList provides the means to do so. More...
#include <painter_brush_shader_glsl.hpp>
Public Member Functions | |
| DependencyList (void) | |
| DependencyList (const DependencyList &obj) | |
| DependencyList & | add_shader (c_string name, const reference_counted_ptr< const PainterBrushShaderGLSL > &shader) |
| DependencyList & | operator= (const DependencyList &rhs) |
| void | swap (DependencyList &obj) |
Friends | |
| class | PainterBrushShaderGLSL |
If one wishes to make use of other PainterBrushShaderGLSL fastuidraw_gl_vert_brush_main()/fastuidraw_gl_frag_brush_main() of other shaders (for example to have a simple shader that adds on to a previous shader), a DependencyList provides the means to do so.
Each such used shader is given a name by which the caller will use it. In addition, the caller has access to the varyings and shared symbols of the callee as well. A varying or shareable V of an element in the DependencyList is accessed from the parent shader with dep::V where dep is the argument value of name to add_shader(). Note that it is accessed with the scope-resolution operator; the uber-shader assember will convert the scope-resolution operator into acceptable GLSL code.
By using the values of the shareables (embodied in fields symbol_list::m_vert_shareable_values and symbol_list::m_frag_shareable_values), reading and potentially modifying the values of the varyings, one can create effects building off of the built-in shaders of the GLSL module.
Lastly, the uber-shader assembler gives a means to avoid collision in using context textures. To avoid re-using the same context textures, the macros fastuidraw_brush_start_context_texture, and fastuidraw_brush_context_texture(X) are provided where
The Uber-shader assembler fills the textures depth-first. Thus the first dependency uses slots [0, 1, .., N - 1] where N is number_context_textures() of the first dependency, then the second dependency uses [N, N + 1, ..., N + M - 1] where M is number_context_textures() of the second dependency and so on.
Definition at line 129 of file painter_brush_shader_glsl.hpp.
| fastuidraw::glsl::PainterBrushShaderGLSL::DependencyList::DependencyList | ( | void | ) |
Ctor.
| fastuidraw::glsl::PainterBrushShaderGLSL::DependencyList::DependencyList | ( | const DependencyList & | obj | ) |
Copy ctor.
| obj | value from which to copy |
| DependencyList& fastuidraw::glsl::PainterBrushShaderGLSL::DependencyList::add_shader | ( | c_string | name, |
| const reference_counted_ptr< const PainterBrushShaderGLSL > & | shader | ||
| ) |
Add a shader to the DependencyList's list.
| name | name by which to call the shader |
| shader | shader to add to this DependencyList |
| DependencyList& fastuidraw::glsl::PainterBrushShaderGLSL::DependencyList::operator= | ( | const DependencyList & | rhs | ) |
Assignment operator
| rhs | value from which to copy |
| void fastuidraw::glsl::PainterBrushShaderGLSL::DependencyList::swap | ( | DependencyList & | obj | ) |
Swap operation
| obj | object with which to swap |
1.8.13