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#include <wayfire/per-output-plugin.hpp>
#include <wayfire/output.hpp>
#include <wayfire/opengl.hpp>
#include <wayfire/render-manager.hpp>
static const char *vertex_shader =
R"(
#version 100
attribute mediump vec2 position;
attribute highp vec2 uvPosition;
varying highp vec2 uvpos;
void main() {
gl_Position = vec4(position.xy, 0.0, 1.0);
uvpos = uvPosition;
}
)";
static const char *fragment_shader =
R"(
#version 100
varying highp vec2 uvpos;
uniform sampler2D smp;
uniform bool preserve_hue;
void main()
{
mediump vec4 tex = texture2D(smp, uvpos);
if (preserve_hue)
{
mediump float hue = tex.a - min(tex.r, min(tex.g, tex.b)) - max(tex.r, max(tex.g, tex.b));
gl_FragColor = hue + tex;
} else
{
gl_FragColor = vec4(1.0 - tex.r, 1.0 - tex.g, 1.0 - tex.b, 1.0);
}
}
)";
class wayfire_invert_screen : public wf::per_output_plugin_instance_t
{
wf::post_hook_t hook;
wf::activator_callback toggle_cb;
wf::option_wrapper_t<bool> preserve_hue{"invert/preserve_hue"};
bool active = false;
OpenGL::program_t program;
wf::plugin_activation_data_t grab_interface = {
.name = "invert",
.capabilities = 0,
};
public:
void init() override
{
wf::option_wrapper_t<wf::activatorbinding_t> toggle_key{"invert/toggle"};
hook = [=] (const wf::framebuffer_t& source,
const wf::framebuffer_t& destination)
{
render(source, destination);
};
toggle_cb = [=] (auto)
{
if (!output->can_activate_plugin(&grab_interface))
{
return false;
}
if (active)
{
output->render->rem_post(&hook);
} else
{
output->render->add_post(&hook);
}
active = !active;
return true;
};
OpenGL::render_begin();
program.set_simple(
OpenGL::compile_program(vertex_shader, fragment_shader));
OpenGL::render_end();
output->add_activator(toggle_key, &toggle_cb);
}
void render(const wf::framebuffer_t& source,
const wf::framebuffer_t& destination)
{
static const float vertexData[] = {
-1.0f, -1.0f,
1.0f, -1.0f,
1.0f, 1.0f,
-1.0f, 1.0f
};
static const float coordData[] = {
0.0f, 0.0f,
1.0f, 0.0f,
1.0f, 1.0f,
0.0f, 1.0f
};
OpenGL::render_begin(destination);
program.use(wf::TEXTURE_TYPE_RGBA);
GL_CALL(glBindTexture(GL_TEXTURE_2D, source.tex));
GL_CALL(glActiveTexture(GL_TEXTURE0));
program.attrib_pointer("position", 2, 0, vertexData);
program.attrib_pointer("uvPosition", 2, 0, coordData);
program.uniform1i("preserve_hue", preserve_hue);
GL_CALL(glDisable(GL_BLEND));
GL_CALL(glDrawArrays(GL_TRIANGLE_FAN, 0, 4));
GL_CALL(glEnable(GL_BLEND));
GL_CALL(glBindTexture(GL_TEXTURE_2D, 0));
program.deactivate();
OpenGL::render_end();
}
void fini() override
{
if (active)
{
output->render->rem_post(&hook);
}
OpenGL::render_begin();
program.free_resources();
OpenGL::render_end();
output->rem_binding(&toggle_cb);
}
};
DECLARE_WAYFIRE_PLUGIN(wf::per_output_plugin_t<wayfire_invert_screen>);
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