milek7/sim branch opengl 3.3 renderer import

gl/postfx.cpp

@@ -0,0 +1,49 @@
+#include "stdafx.h"
+
+#include "postfx.h"
+
+std::shared_ptr<gl::shader> gl::postfx::vertex;
+std::shared_ptr<gl::vao> gl::postfx::vao;
+
+gl::postfx::postfx(const std::string &s) : postfx(shader("postfx_" + s + ".frag"))
+{
+}
+
+gl::postfx::postfx(const shader &s)
+{
+    if (!vertex)
+        vertex = std::make_shared<gl::shader>("quad.vert");
+    if (!vao)
+        vao = std::make_shared<gl::vao>();
+
+    program.attach(*vertex);
+    program.attach(s);
+    program.link();
+}
+
+void gl::postfx::apply(opengl_texture &src, framebuffer *dst)
+{
+    apply({&src}, dst);
+}
+
+void gl::postfx::apply(std::vector<opengl_texture *> src, framebuffer *dst)
+{
+    if (dst)
+    {
+        dst->clear(GL_COLOR_BUFFER_BIT);
+        dst->bind();
+    }
+    else
+        framebuffer::unbind();
+
+    program.bind();
+    vao->bind();
+
+    size_t unit = 0;
+    for (opengl_texture *tex : src)
+        tex->bind(unit++);
+
+    glDisable(GL_DEPTH_TEST);
+    glDepthMask(GL_FALSE);
+    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+}