//------------------------------------
ofMesh ofTexture::getMeshForSubsection(float x, float y, float z, float w, float h, float sx, float sy, float sw, float sh, bool vflipped, ofRectMode rectMode) const{
ofMesh quad;
if(!texData.bAllocated){
return quad;
}
GLfloat px0 = x; // up to you to get the aspect ratio right
GLfloat py0 = y;
GLfloat px1 = w+x;
GLfloat py1 = h+y;
if (texData.bFlipTexture == vflipped){
swap(py0,py1);
}
// for rect mode center, let's do this:
if (rectMode == OF_RECTMODE_CENTER){
px0 -= w/2;
py0 -= h/2;
px1 -= w/2;
py1 -= h/2;
}
//we translate our drawing points by our anchor point.
//we still respect ofRectMode so if you have rect mode set to
//OF_RECTMODE_CENTER your anchor will be relative to that.
GLfloat anchorX;
GLfloat anchorY;
if(bAnchorIsPct){
anchorX = anchor.x * w;
anchorY = anchor.y * h;
}else{
anchorX = anchor.x;
anchorY = anchor.y;
}
px0 -= anchorX;
py0 -= anchorY;
px1 -= anchorX;
py1 -= anchorY;
// -------------------------------------------------
// complete hack to remove border artifacts.
// slightly, slightly alters an image, scaling...
// to remove the border.
// we need a better solution for this, but
// to constantly add a 2 pixel border on all uploaded images
// is insane..
GLfloat offsetw = 0.0f;
GLfloat offseth = 0.0f;
if (!ofGLSupportsNPOTTextures() && bTexHackEnabled) {
offsetw = 1.0f / (texData.tex_w);
offseth = 1.0f / (texData.tex_h);
}
// -------------------------------------------------
ofPoint topLeft = getCoordFromPoint(sx, sy);
ofPoint bottomRight = getCoordFromPoint(sx + sw, sy + sh);
GLfloat tx0 = topLeft.x + offsetw;
GLfloat ty0 = topLeft.y + offseth;
GLfloat tx1 = bottomRight.x - offsetw;
GLfloat ty1 = bottomRight.y - offseth;
quad.setMode(OF_PRIMITIVE_TRIANGLE_FAN);
quad.getVertices().resize(4);
quad.getTexCoords().resize(4);
quad.getVertices()[0].set(px0,py0,z);
quad.getVertices()[1].set(px1,py0,z);
quad.getVertices()[2].set(px1,py1,z);
quad.getVertices()[3].set(px0,py1,z);
quad.getTexCoords()[0].set(tx0,ty0);
quad.getTexCoords()[1].set(tx1,ty0);
quad.getTexCoords()[2].set(tx1,ty1);
quad.getTexCoords()[3].set(tx0,ty1);
return quad;
}
//----------------------------------------------------------
void ofTexture::drawSubsection(float x, float y, float z, float w, float h, float sx, float sy, float sw, float sh) {
if(!texData.bAllocated){
return;
}
GLfloat px0 = x; // up to you to get the aspect ratio right
GLfloat py0 = y;
GLfloat px1 = w+x;
GLfloat py1 = h+y;
if (texData.bFlipTexture == ofIsVFlipped()){
swap(py0,py1);
}
// for rect mode center, let's do this:
if (ofGetRectMode() == OF_RECTMODE_CENTER){
px0 -= w/2;
py0 -= h/2;
px1 -= w/2;
py1 -= h/2;
}
//we translate our drawing points by our anchor point.
//we still respect ofRectMode so if you have rect mode set to
//OF_RECTMODE_CENTER your anchor will be relative to that.
GLfloat anchorX;
GLfloat anchorY;
if(bAnchorIsPct){
anchorX = anchor.x * w;
anchorY = anchor.y * h;
}else{
anchorX = anchor.x;
anchorY = anchor.y;
}
px0 -= anchorX;
py0 -= anchorY;
px1 -= anchorX;
py1 -= anchorY;
// -------------------------------------------------
// complete hack to remove border artifacts.
// slightly, slightly alters an image, scaling...
// to remove the border.
// we need a better solution for this, but
// to constantly add a 2 pixel border on all uploaded images
// is insane..
GLfloat offsetw = 0.0f;
GLfloat offseth = 0.0f;
if (!ofGLSupportsNPOTTextures() && bTexHackEnabled) {
offsetw = 1.0f / (texData.tex_w);
offseth = 1.0f / (texData.tex_h);
}
// -------------------------------------------------
ofPoint topLeft = getCoordFromPoint(sx, sy);
ofPoint bottomRight = getCoordFromPoint(sx + sw, sy + sh);
GLfloat tx0 = topLeft.x + offsetw;
GLfloat ty0 = topLeft.y + offseth;
GLfloat tx1 = bottomRight.x - offsetw;
GLfloat ty1 = bottomRight.y - offseth;
quad.getVertices()[0].set(px0,py0,z);
quad.getVertices()[1].set(px1,py0,z);
quad.getVertices()[2].set(px1,py1,z);
quad.getVertices()[3].set(px0,py1,z);
quad.getTexCoords()[0].set(tx0,ty0);
quad.getTexCoords()[1].set(tx1,ty0);
quad.getTexCoords()[2].set(tx1,ty1);
quad.getTexCoords()[3].set(tx0,ty1);
// make sure we are on unit 0 - we may change this when setting shader samplers
// before glEnable or else the shader gets confused
/// ps: maybe if bUsingArbTex is enabled we should use glActiveTextureARB?
//glActiveTexture(GL_TEXTURE0);
bool wasBound = texData.isBound;
if(!wasBound) bind(0);
quad.draw();
if(!wasBound) unbind(0);
}
