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110 lines
3.6 KiB
110 lines
3.6 KiB
/* |
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vgui_clip.cpp - clip in 2D space |
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Copyright (C) 2011 Uncle Mike |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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*/ |
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#include "common.h" |
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#include "vgui_draw.h" |
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#include "wrect.h" |
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//----------------------------------------------------------------------------- |
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// For simulated scissor tests... |
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//----------------------------------------------------------------------------- |
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static wrect_t g_ScissorRect; |
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static qboolean g_bScissor = false; |
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//----------------------------------------------------------------------------- |
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// Enable/disable scissoring... |
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//----------------------------------------------------------------------------- |
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void EnableScissor( qboolean enable ) |
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{ |
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g_bScissor = enable; |
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} |
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void SetScissorRect( int left, int top, int right, int bottom ) |
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{ |
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// Check for a valid rectangle... |
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Assert( left <= right ); |
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Assert( top <= bottom ); |
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g_ScissorRect.left = left; |
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g_ScissorRect.top = top; |
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g_ScissorRect.right = right; |
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g_ScissorRect.bottom = bottom; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Used for clipping, produces an interpolated texture coordinate |
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//----------------------------------------------------------------------------- |
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inline float InterpTCoord( float val, float mins, float maxs, float tMin, float tMax ) |
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{ |
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float flPercent; |
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if( mins != maxs ) |
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flPercent = (float)(val - mins) / (maxs - mins); |
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else flPercent = 0.5f; |
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return tMin + (tMax - tMin) * flPercent; |
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} |
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//----------------------------------------------------------------------------- |
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// Purpose: Does a scissor clip of the input rectangle. |
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// Returns false if it is completely clipped off. |
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//----------------------------------------------------------------------------- |
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qboolean ClipRect( const vpoint_t &inUL, const vpoint_t &inLR, vpoint_t *pOutUL, vpoint_t *pOutLR ) |
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{ |
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if( g_bScissor ) |
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{ |
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// pick whichever left side is larger |
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if( g_ScissorRect.left > inUL.point[0] ) |
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pOutUL->point[0] = g_ScissorRect.left; |
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else |
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pOutUL->point[0] = inUL.point[0]; |
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// pick whichever right side is smaller |
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if( g_ScissorRect.right <= inLR.point[0] ) |
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pOutLR->point[0] = g_ScissorRect.right; |
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else |
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pOutLR->point[0] = inLR.point[0]; |
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// pick whichever top side is larger |
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if( g_ScissorRect.top > inUL.point[1] ) |
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pOutUL->point[1] = g_ScissorRect.top; |
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else |
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pOutUL->point[1] = inUL.point[1]; |
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// pick whichever bottom side is smaller |
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if( g_ScissorRect.bottom <= inLR.point[1] ) |
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pOutLR->point[1] = g_ScissorRect.bottom; |
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else |
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pOutLR->point[1] = inLR.point[1]; |
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// Check for non-intersecting |
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if(( pOutUL->point[0] > pOutLR->point[0] ) || ( pOutUL->point[1] > pOutLR->point[1] )) |
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{ |
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return false; |
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} |
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pOutUL->coord[0] = InterpTCoord(pOutUL->point[0], inUL.point[0], inLR.point[0], inUL.coord[0], inLR.coord[0] ); |
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pOutLR->coord[0] = InterpTCoord(pOutLR->point[0], inUL.point[0], inLR.point[0], inUL.coord[0], inLR.coord[0] ); |
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pOutUL->coord[1] = InterpTCoord(pOutUL->point[1], inUL.point[1], inLR.point[1], inUL.coord[1], inLR.coord[1] ); |
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pOutLR->coord[1] = InterpTCoord(pOutLR->point[1], inUL.point[1], inLR.point[1], inUL.coord[1], inLR.coord[1] ); |
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} |
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else |
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{ |
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*pOutUL = inUL; |
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*pOutLR = inLR; |
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} |
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return true; |
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} |