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Canvas:clear() when multiple canvases are active is now more efficient when GL3+ is supported

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This commit is contained in:
Alex Szpakowski
2013-07-06 07:02:48 -03:00
parent 268fca156f
commit 9da1af1e99
1 changed files with 30 additions and 13 deletions
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src/modules/graphics/opengl/Canvas.cpp
+30 -13
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@@ -560,23 +560,40 @@ void Canvas::clear(const Color &c)
strategy->bindFBO(fbo);
}
// Make sure only this canvas is cleared when multi-canvas rendering is set.
if (attachedCanvases.size() > 0)
strategy->setAttachments();
// We don't need to worry about multiple FBO attachments or global clear
// color state when OpenGL 3.0+ is supported.
if (GLEE_VERSION_3_0)
{
GLuint glcolor[] = {c.r, c.g, c.b, c.a};
glClearBufferuiv(GL_COLOR, 0, glcolor);
// Don't use the state-shadowed gl.setClearColor because we want to save the
// previous clear color.
glClearColor((float)c.r/255.0f, (float)c.g/255.0f, (float)c.b/255.0f, (float)c.a/255.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
if (depth_stencil != 0)
{
GLint stencilvalue = 0;
glClearBufferiv(GL_STENCIL, 0, &stencilvalue);
}
}
else
{
// glClear will clear all active draw buffers, so we need to temporarily
// detach any other canvases (when MRT is being used.)
if (attachedCanvases.size() > 0)
strategy->setAttachments();
if (attachedCanvases.size() > 0)
strategy->setAttachments(attachedCanvases);
// Don't use the state-shadowed gl.setClearColor because we want to save
// the previous clear color.
glClearColor((float)c.r/255.0f, (float)c.g/255.0f, (float)c.b/255.0f, (float)c.a/255.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
if (attachedCanvases.size() > 0)
strategy->setAttachments(attachedCanvases);
// Restore the global clear color.
gl.setClearColor(gl.getClearColor());
}
if (current != this)
strategy->bindFBO(previous);
// Restore the previous clear color.
gl.setClearColor(gl.getClearColor());
}
void Canvas::draw(float x, float y, float angle, float sx, float sy, float ox, float oy, float kx, float ky) const
@@ -623,7 +640,7 @@ void Canvas::drawg(love::graphics::Geometry *geom, float x, float y, float angle
bool Canvas::checkCreateStencil()
{
// Do nothing if we've already created the stencil buffer.
if (depth_stencil)
if (depth_stencil != 0)
return true;
if (current != this)