mirror of
https://github.com/leozide/leocad
synced 2024-11-17 07:47:55 +01:00
130 lines
3 KiB
C++
130 lines
3 KiB
C++
#include "lc_global.h"
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#include "tr.h"
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#include "lc_math.h"
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TiledRender::TiledRender()
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{
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mTileWidth = 256;
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mTileHeight = 256;
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mCurrentTile = -1;
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}
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TiledRender::~TiledRender()
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{
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}
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void TiledRender::TileSize(int width, int height)
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{
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mTileWidth = width;
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mTileHeight = height;
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}
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void TiledRender::ImageSize(int width, int height)
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{
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mImageWidth = width;
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mImageHeight = height;
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}
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void TiledRender::Ortho(double left, double right, double bottom, double top, double zNear, double zFar)
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{
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if (mCurrentTile < 0)
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{
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mPerspective = false;
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mLeft = left;
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mRight = right;
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mBottom = bottom;
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mTop = top;
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mNear = zNear;
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mFar = zFar;
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}
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}
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void TiledRender::Frustum(double left, double right, double bottom, double top, double zNear, double zFar)
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{
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if (mCurrentTile < 0)
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{
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mPerspective = true;
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mLeft = left;
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mRight = right;
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mBottom = bottom;
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mTop = top;
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mNear = zNear;
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mFar = zFar;
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}
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}
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void TiledRender::Perspective(double fovy, double aspect, double zNear, double zFar)
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{
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double xmin, xmax, ymin, ymax;
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ymax = zNear * tan(fovy * 3.14159265 / 360.0);
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ymin = -ymax;
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xmin = ymin * aspect;
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xmax = ymax * aspect;
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Frustum(xmin, xmax, ymin, ymax, zNear, zFar);
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}
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lcMatrix44 TiledRender::BeginTile()
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{
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int tileWidth, tileHeight;
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double left, right, bottom, top;
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if (mCurrentTile <= 0)
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{
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mColumns = (mImageWidth + mTileWidth - 1) / mTileWidth;
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mRows = (mImageHeight + mTileHeight - 1) / mTileHeight;
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mCurrentTile = 0;
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// Save user's viewport, will be restored after last tile rendered
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glGetIntegerv(GL_VIEWPORT, mViewportSave);
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}
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// which tile (by row and column) we're about to render
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mCurrentRow = mCurrentTile / mColumns;
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mCurrentColumn = mCurrentTile % mColumns;
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// Compute actual size of this tile with border
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if (mCurrentRow < mRows - 1)
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tileHeight = mTileHeight;
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else
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tileHeight = mImageHeight - (mRows - 1) * (mTileHeight);
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if (mCurrentColumn < mColumns - 1)
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tileWidth = mTileWidth;
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else
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tileWidth = mImageWidth - (mColumns - 1) * (mTileWidth);
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// Save tile size, with border
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mCurrentTileWidth = tileWidth;
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mCurrentTileHeight = tileHeight;
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glViewport(0, 0, tileWidth, tileHeight); // tile size including border
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// compute projection parameters
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left = mLeft + (mRight - mLeft) * (mCurrentColumn * mTileWidth) / mImageWidth;
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right = left + (mRight - mLeft) * tileWidth / mImageWidth;
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bottom = mBottom + (mTop - mBottom) * (mCurrentRow * mTileHeight) / mImageHeight;
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top = bottom + (mTop - mBottom) * tileHeight / mImageHeight;
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if (mPerspective)
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return lcMatrix44Frustum(left, right, bottom, top, mNear, mFar);
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else
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return lcMatrix44Ortho(left, right, bottom, top, mNear, mFar);
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}
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int TiledRender::EndTile()
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{
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// be sure OpenGL rendering is finished
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glFlush();
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// increment tile counter, return 1 if more tiles left to render
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mCurrentTile++;
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if (mCurrentTile >= mRows * mColumns)
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{
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// restore user's viewport
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glViewport(mViewportSave[0], mViewportSave[1], mViewportSave[2], mViewportSave[3]);
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mCurrentTile = -1; // all done
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return 0;
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}
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else
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return 1;
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}
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