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Add framebuffer::read_pixels

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This commit is contained in:
Nikita Lisitsa 2020-11-10 13:23:17 +03:00
parent 34cdba80a1
commit 67c6e18ef0
2 changed files with 24 additions and 0 deletions
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19
libs/gfx/include/psemek/gfx/framebuffer.hpp
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@ -3,6 +3,8 @@
#include <psemek/gfx/gl.hpp> #include <psemek/gfx/gl.hpp>
#include <psemek/gfx/texture.hpp> #include <psemek/gfx/texture.hpp>
#include <psemek/gfx/renderbuffer.hpp> #include <psemek/gfx/renderbuffer.hpp>
#include <psemek/gfx/pixel.hpp>
#include <psemek/gfx/pixmap.hpp>
namespace psemek::gfx namespace psemek::gfx
{ {
@ -24,6 +26,7 @@ namespace psemek::gfx
explicit operator bool() const { return id() != 0; } explicit operator bool() const { return id() != 0; }
void bind() const; void bind() const;
void bind_read() const;
void reset(); void reset();
@ -47,6 +50,22 @@ namespace psemek::gfx
bool complete() const; bool complete() const;
void assert_complete() const; void assert_complete() const;
template <typename Pixel>
void read_pixels(basic_pixmap<Pixel> & p) const
{
using traits = pixel_traits<Pixel>;
bind_read();
gl::ReadPixels(0, 0, p.width(), p.height(), traits::format, traits::type, p.data());
}
template <typename Pixel>
basic_pixmap<Pixel> read_pixels(std::size_t width, std::size_t height) const
{
basic_pixmap<Pixel> p({width, height});
read_pixels(p);
return p;
}
private: private:
GLuint id_; GLuint id_;

5
libs/gfx/source/framebuffer.cpp
View file

@ -53,6 +53,11 @@ namespace psemek::gfx
gl::BindFramebuffer(gl::DRAW_FRAMEBUFFER, id_); gl::BindFramebuffer(gl::DRAW_FRAMEBUFFER, id_);
} }
void framebuffer::bind_read() const
{
gl::BindFramebuffer(gl::READ_FRAMEBUFFER, id_);
}
void framebuffer::reset() void framebuffer::reset()
{ {
if (id_ != 0) if (id_ != 0)