milek7/sim branch opengl 3.3 renderer import

gl/framebuffer.cpp

@@ -0,0 +1,103 @@
+#include "stdafx.h"
+#include "framebuffer.h"
+
+gl::framebuffer::framebuffer()
+{
+    glGenFramebuffers(1, *this);
+}
+
+gl::framebuffer::~framebuffer()
+{
+    glDeleteFramebuffers(1, *this);
+}
+
+void gl::framebuffer::bind(GLuint id)
+{
+    glBindFramebuffer(GL_FRAMEBUFFER, id);
+}
+
+void gl::framebuffer::attach(const opengl_texture &tex, GLenum location)
+{
+    bind();
+    glFramebufferTexture2D(GL_FRAMEBUFFER, location, tex.target, tex.id, 0);
+}
+
+void gl::framebuffer::attach(const cubemap &tex, int face, GLenum location)
+{
+    bind();
+    glFramebufferTexture2D(GL_FRAMEBUFFER, location, GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, *tex, 0);
+}
+
+void gl::framebuffer::attach(const renderbuffer &rb, GLenum location)
+{
+    bind();
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, location, GL_RENDERBUFFER, *rb);
+}
+
+void gl::framebuffer::detach(GLenum location)
+{
+    bind();
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, location, GL_RENDERBUFFER, 0);
+}
+
+bool gl::framebuffer::is_complete()
+{
+    bind();
+    GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
+    return status == GL_FRAMEBUFFER_COMPLETE;
+}
+
+void gl::framebuffer::clear(GLbitfield mask)
+{
+    bind();
+    if (mask & GL_DEPTH_BUFFER_BIT)
+        glDepthMask(GL_TRUE);
+    glClear(mask);
+}
+
+void gl::framebuffer::blit_to(framebuffer *other, int w, int h, GLbitfield mask, GLenum attachment)
+{
+    blit(this, other, 0, 0, w, h, mask, attachment);
+}
+
+void gl::framebuffer::blit_from(framebuffer *other, int w, int h, GLbitfield mask, GLenum attachment)
+{
+    blit(other, this, 0, 0, w, h, mask, attachment);
+}
+
+void gl::framebuffer::blit(framebuffer *src, framebuffer *dst, int sx, int sy, int w, int h, GLbitfield mask, GLenum attachment)
+{
+    glBindFramebuffer(GL_READ_FRAMEBUFFER, src ? *src : 0);
+    glBindFramebuffer(GL_DRAW_FRAMEBUFFER, dst ? *dst : 0);
+
+    if (mask & GL_COLOR_BUFFER_BIT)
+    {
+        int attachment_n = attachment - GL_COLOR_ATTACHMENT0;
+
+        GLenum outputs[8] = { GL_NONE };
+        outputs[attachment_n] = attachment;
+
+        glReadBuffer(attachment);
+        glDrawBuffers(attachment_n + 1, outputs);
+    }
+
+    glBlitFramebuffer(sx, sy, sx + w, sy + h, 0, 0, w, h, mask, GL_NEAREST);
+    unbind();
+}
+
+void gl::framebuffer::setup_drawing(int attachments)
+{
+    bind();
+    GLenum a[8] =
+    {
+        GL_COLOR_ATTACHMENT0,
+        GL_COLOR_ATTACHMENT1,
+        GL_COLOR_ATTACHMENT2,
+        GL_COLOR_ATTACHMENT3,
+        GL_COLOR_ATTACHMENT4,
+        GL_COLOR_ATTACHMENT5,
+        GL_COLOR_ATTACHMENT6,
+        GL_COLOR_ATTACHMENT7
+    };
+    glDrawBuffers(std::min(attachments, 8), &a[0]);
+}