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#include "../core/je_configuration.h"
#if defined(jin_graphics)
#include "../utils/je_macros.h"
#include "je_canvas.h"
#include "je_window.h"
namespace JinEngine
{
namespace Graphics
{
/*class member*/ const Canvas* Canvas::current = nullptr;
/*class member*/ const Canvas* const Canvas::DEFAULT_CANVAS = new Canvas(0);
/*class member*/ Canvas* Canvas::createCanvas(int w, int h)
{
return new Canvas(w, h);
}
Canvas::Canvas(GLuint n)
: fbo(n)
{
}
Canvas::Canvas(int w, int h)
: Graphic(w, h)
{
GLint current_fbo;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, ¤t_fbo);
// Generate a new render buffer object
fbo = gl.genFrameBuffer();
gl.bindFrameBuffer(fbo);
GLuint texture = getGLTexture();
gl.bindTexture(texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
gl.texImage(GL_RGBA8, w, h, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
gl.bindTexture(0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
// Unbind framebuffer
gl.bindFrameBuffer(current_fbo);
}
Canvas::~Canvas()
{
}
/*class member*/ bool Canvas::isBinded(const Canvas* cvs)
{
return current == cvs;
}
/**
* bind to canvas
*/
/*class member*/ void Canvas::bind(Canvas* canvas)
{
if (isBinded(canvas)) return;
current = canvas;
gl.bindFrameBuffer(canvas->fbo);
int w = canvas->getWidth();
int h = canvas->getHeight();
// Set view port to canvas.
glViewport(0, 0, w, h);
gl.setProjectionMatrix(0, w, 0, h, -1, 1);
}
/**
* bind to default screen render buffer.
* do some coordinates transform work
* https://blog.csdn.net/liji_digital/article/details/79370841
* https://blog.csdn.net/lyx2007825/article/details/8792475
*/
/*class member*/ void Canvas::unbind()
{
if (isBinded(DEFAULT_CANVAS)) return;
current = DEFAULT_CANVAS;
/* get window size as viewport */
Window* wnd = Window::get();
int w = wnd->getW();
int h = wnd->getH();
glBindFramebuffer(GL_FRAMEBUFFER, DEFAULT_CANVAS->fbo);
/* set viewport on screen */
glViewport(0, 0, w, h);
gl.setProjectionMatrix(0, w, h, 0, -1, 1);
}
} // namespace Graphics
} // namespace JinEngine
#endif // defined(jin_graphics)
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