75 lines
1.3 KiB
C++
75 lines
1.3 KiB
C++
#include <psemek/gfx/effect/overlay.hpp>
|
|
#include <psemek/gfx/program.hpp>
|
|
#include <psemek/gfx/array.hpp>
|
|
|
|
#include <psemek/util/pimpl.hpp>
|
|
|
|
namespace psemek::gfx
|
|
{
|
|
|
|
static char const overlay_vs[] =
|
|
R"(#version 330
|
|
|
|
const vec4 vertices[6] = vec4[6](
|
|
vec4(-1.0, -1.0, 0.0, 1.0),
|
|
vec4( 1.0, -1.0, 0.0, 1.0),
|
|
vec4( 1.0, 1.0, 0.0, 1.0),
|
|
|
|
vec4(-1.0, -1.0, 0.0, 1.0),
|
|
vec4( 1.0, 1.0, 0.0, 1.0),
|
|
vec4(-1.0, 1.0, 0.0, 1.0)
|
|
);
|
|
|
|
out vec2 texcoord;
|
|
|
|
void main()
|
|
{
|
|
gl_Position = vertices[gl_VertexID];
|
|
texcoord = vertices[gl_VertexID].xy * 0.5 + vec2(0.5);
|
|
}
|
|
)";
|
|
|
|
static char const overlay_fs[] =
|
|
R"(#version 330
|
|
|
|
uniform sampler2D u_texture;
|
|
|
|
in vec2 texcoord;
|
|
|
|
out vec4 out_color;
|
|
|
|
void main()
|
|
{
|
|
out_color = texture(u_texture, texcoord);
|
|
}
|
|
)";
|
|
|
|
struct overlay::impl
|
|
{
|
|
gfx::program program{overlay_vs, overlay_fs};
|
|
gfx::array array;
|
|
};
|
|
|
|
overlay::overlay()
|
|
: pimpl_{make_impl()}
|
|
{
|
|
impl().program.bind();
|
|
impl().program["u_texture"] = 0;
|
|
}
|
|
|
|
overlay::~overlay() = default;
|
|
|
|
void overlay::invoke(texture_2d const & src, render_target const & dst)
|
|
{
|
|
gl::Disable(gl::DEPTH_TEST);
|
|
gl::Disable(gl::CULL_FACE);
|
|
|
|
dst.bind();
|
|
gl::ActiveTexture(gl::TEXTURE0);
|
|
src.bind();
|
|
impl().array.bind();
|
|
impl().program.bind();
|
|
gl::DrawArrays(gl::TRIANGLES, 0, 6);
|
|
}
|
|
|
|
}
|