private static void DrawTexture(Rect screenRect, Rect uvs, Texture texture, bool texelAdjust)
{
// sanity check
if (uvs.width == 0 || uvs.height == 0 || screenRect.width == 0 || screenRect.height == 0 || (texture == null))
{
return;
}
Rect uvsAdjusted;
if (texelAdjust)
{
// adjust the uvs by half a pixel - sometimes useful when textures are closely packed
const float texelAdjustPixels = 0.5f;
Vector2 uvHalfPixel = new Vector2(texelAdjustPixels / texture.width, texelAdjustPixels / texture.height);
uvsAdjusted = Rect.MinMaxRect(uvs.xMin + uvHalfPixel.x,
uvs.yMin + uvHalfPixel.y,
uvs.xMax - uvHalfPixel.x,
uvs.yMax - uvHalfPixel.y);
}
else
{
// do not adjust
uvsAdjusted = uvs;
}
// create Vec2 sizes for the inputs
Vector2 screenRectSize = new Vector2(screenRect.width, screenRect.height);
Vector2 uvSize = new Vector2(uvsAdjusted.width, uvsAdjusted.height);
Vector2 textureSize = new Vector2(texture.width, texture.height);
// convert the UV size into pixels
Vector2 uvSizeInPixels = Vector2.Scale(textureSize, uvSize);
// divide the screenRect size (pixels) by the uv size (pixels) to get a scale ration
Vector2 textureScale = new Vector2(screenRectSize.x / uvSizeInPixels.x, screenRectSize.y / uvSizeInPixels.y);
// convert the UV offset into pixels
Vector2 uvOffsetInPixels = new Vector2(uvsAdjusted.xMin * textureSize.x, uvsAdjusted.yMin * textureSize.y);
// multiply the uv offset (pixels) by the texture scale to get the offset of the texture
// this result will be positive but we need to move the texture left and up - which is the negative direction so *=-1
Vector2 textureOffset = new Vector2(uvOffsetInPixels.x * textureScale.x, uvOffsetInPixels.y * textureScale.y) * -1;
// multiply the texture size by the texture scale to get the actual width and height the texture should be drawn at
Vector2 textureRectSize = Vector2.Scale(textureScale, textureSize);
// set up the rect used to draw the texture
Rect textureRect = GUIx.Vector2Rect(textureOffset, textureRectSize);
// set up a GUI clipping rect
GUI.BeginGroup(screenRect);
// rendering the texture directly always results in scaling - use a guiStyle
GUIStyle guiStyle = new GUIStyle();
guiStyle.normal.background = (Texture2D)texture;
// render the texture - use GUI.Box instead of GUI.DrawTexture as GUI.DrawTexture does not obey Group clipping
GUI.Box(textureRect, (string)null, guiStyle);
// end GUI clipping rect
GUI.EndGroup();
}
private static void DrawScaleTexture(Rect screenRect, Texture texture)
{
// sanity check
if (screenRect.width == 0 ||
screenRect.height == 0 ||
texture == null ||
texture.width == 0 ||
texture.height == 0)
{
return;
}
// calculate sizes used when drawing
Vector2 screenRectSize = new Vector2(screenRect.width, screenRect.height);
Vector2 halfScreenRectSize = screenRectSize / 2.0f;
Vector2 textureSize = new Vector2(1.0f, 1.0f); // use 1.0 instead of actual size as we are passing in UVs
Vector2 textureThirdSize = textureSize / 3.0f;
Vector2 textureCornerPixels = new Vector2(texture.width / 3.0f, texture.height / 3.0f);
Vector2 cornerSize = new Vector2(Mathf.Min(halfScreenRectSize.x, textureCornerPixels.x),
Mathf.Min(halfScreenRectSize.y, textureCornerPixels.y));
Vector2 edgeSize = new Vector2(screenRectSize.x - (textureCornerPixels.x * 2.0f),
screenRectSize.y - (textureCornerPixels.y * 2.0f));
// use a GUI group to get correct offsetting
GUI.BeginGroup(screenRect);
// draw the corners
// top left
GUIx.DrawTexture(GUIx.Vector2Rect(Vector2.zero, cornerSize),
GUIx.Vector2Rect(Vector2.zero, textureThirdSize),
texture);
// top right
GUIx.DrawTexture(GUIx.Vector2Rect(new Vector2(screenRectSize.x - cornerSize.x, 0.0f), cornerSize),
GUIx.Vector2Rect(new Vector2(textureSize.x - textureThirdSize.x, 0.0f), textureThirdSize),
texture);
// bottom left
GUIx.DrawTexture(GUIx.Vector2Rect(new Vector2(0.0f, screenRectSize.y - cornerSize.y), cornerSize),
GUIx.Vector2Rect(new Vector2(0.0f, textureSize.y - textureThirdSize.y), textureThirdSize),
texture);
// bottom right
GUIx.DrawTexture(GUIx.Vector2Rect(screenRectSize - cornerSize, cornerSize),
GUIx.Vector2Rect(textureSize - textureThirdSize, textureThirdSize),
texture);
// will be set to false if one or both of the edges does not draw
bool drawCentre = true;
// should the horizontal edges be drawn?
if (edgeSize.x > 0.0)
{
// top
GUIx.DrawTexture(GUIx.Vector2Rect(new Vector2(cornerSize.x, 0.0f), new Vector2(edgeSize.x, cornerSize.y)),
GUIx.Vector2Rect(new Vector2(textureThirdSize.x, 0.0f), textureThirdSize),
texture);
// bottom
GUIx.DrawTexture(
GUIx.Vector2Rect(new Vector2(cornerSize.x, screenRectSize.y - cornerSize.y), new Vector2(edgeSize.x, cornerSize.y)),
GUIx.Vector2Rect(new Vector2(textureThirdSize.x, textureSize.y - textureThirdSize.y), textureThirdSize),
texture);
}
else
{
drawCentre = false;
}
// should the vertical edges be drawn?
if (edgeSize.y > 0.0)
{
// left
GUIx.DrawTexture(GUIx.Vector2Rect(new Vector2(0.0f, cornerSize.y), new Vector2(cornerSize.x, edgeSize.y)),
GUIx.Vector2Rect(new Vector2(0.0f, textureThirdSize.y), textureThirdSize),
texture);
// right
GUIx.DrawTexture(
GUIx.Vector2Rect(new Vector2(screenRectSize.x - cornerSize.x, cornerSize.y), new Vector2(cornerSize.x, edgeSize.y)),
GUIx.Vector2Rect(new Vector2(textureSize.x - textureThirdSize.x, textureThirdSize.y), textureThirdSize),
texture);
}
else
{
drawCentre = false;
}
// if both edges were drawn, draw the centre texture
if (drawCentre)
{
GUIx.DrawTexture(GUIx.Vector2Rect(cornerSize, edgeSize),
GUIx.Vector2Rect(textureThirdSize, textureThirdSize),
texture);
}
// end the GUI group
GUI.EndGroup();
}