forked from 0ad/0ad
246 lines
6.4 KiB
C++
246 lines
6.4 KiB
C++
/* Copyright (C) 2011 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. 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 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "precompiled.h"
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#include "LOSTexture.h"
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#include "graphics/Terrain.h"
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#include "lib/bits.h"
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#include "ps/Game.h"
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#include "ps/Profile.h"
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#include "ps/World.h"
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#include "renderer/Renderer.h"
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#include "simulation2/Simulation2.h"
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#include "simulation2/components/ICmpRangeManager.h"
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/*
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The LOS bitmap is computed with one value per map vertex, based on
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CCmpRangeManager's visibility information.
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The bitmap is then blurred using an NxN box filter (i.e. convolution
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with (1 1 1; 1 1 1; 1 1 1) etc). To implement the blur efficiently without
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using extra memory for a second copy of the bitmap, we generate the bitmap
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with (N-1)/2 pixels of padding on each side, then the blur shifts the
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image back into the corner.
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The blurred bitmap is then uploaded into a GL texture for use by the renderer.
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*/
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// Blur with a NxN box filter, where N = g_BlurSize must be an odd number.
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static const size_t g_BlurSize = 5;
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CLOSTexture::CLOSTexture() :
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m_Dirty(true), m_Texture(0), m_MapSize(0), m_TextureSize(0)
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{
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}
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CLOSTexture::~CLOSTexture()
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{
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if (m_Texture)
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{
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glDeleteTextures(1, &m_Texture);
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m_Texture = 0;
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}
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}
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void CLOSTexture::MakeDirty()
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{
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m_Dirty = true;
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}
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void CLOSTexture::BindTexture(int unit)
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{
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if (m_Dirty)
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{
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RecomputeTexture(unit);
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m_Dirty = false;
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}
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g_Renderer.BindTexture(unit, m_Texture);
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}
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const float* CLOSTexture::GetTextureMatrix()
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{
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debug_assert(!m_Dirty);
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return &m_TextureMatrix._11;
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}
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const float* CLOSTexture::GetMinimapTextureMatrix()
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{
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debug_assert(!m_Dirty);
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return &m_MinimapTextureMatrix._11;
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}
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void CLOSTexture::ConstructTexture(int unit)
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{
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CTerrain* terrain = g_Game->GetWorld()->GetTerrain();
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m_MapSize = terrain->GetVerticesPerSide();
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m_TextureSize = (GLsizei)round_up_to_pow2((size_t)m_MapSize + g_BlurSize - 1);
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glGenTextures(1, &m_Texture);
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g_Renderer.BindTexture(unit, m_Texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA8, m_TextureSize, m_TextureSize, 0, GL_ALPHA, GL_UNSIGNED_BYTE, 0);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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{
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// Texture matrix: We want to map
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// world pos (0, y, 0) (i.e. first vertex)
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// onto texcoord (0.5/texsize, 0.5/texsize) (i.e. middle of first texel);
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// world pos ((mapsize-1)*cellsize, y, (mapsize-1)*cellsize) (i.e. last vertex)
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// onto texcoord ((mapsize-0.5) / texsize, (mapsize-0.5) / texsize) (i.e. middle of last texel)
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float s = (m_MapSize-1) / (float)(m_TextureSize * (m_MapSize-1) * CELL_SIZE);
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float t = 0.5f / m_TextureSize;
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m_TextureMatrix.SetZero();
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m_TextureMatrix._11 = s;
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m_TextureMatrix._23 = s;
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m_TextureMatrix._14 = t;
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m_TextureMatrix._24 = t;
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m_TextureMatrix._44 = 1;
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}
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{
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// Minimap matrix: We want to map UV (0,0)-(1,1) onto (0,0)-(mapsize/texsize, mapsize/texsize)
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float s = m_MapSize / (float)m_TextureSize;
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m_MinimapTextureMatrix.SetZero();
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m_MinimapTextureMatrix._11 = s;
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m_MinimapTextureMatrix._22 = s;
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m_MinimapTextureMatrix._44 = 1;
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}
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}
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void CLOSTexture::RecomputeTexture(int unit)
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{
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if (!m_Texture)
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ConstructTexture(unit);
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PROFILE("recompute LOS texture");
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std::vector<u8> losData;
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losData.resize(GetBitmapSize(m_MapSize, m_MapSize));
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CmpPtr<ICmpRangeManager> cmpRangeManager(*g_Game->GetSimulation2(), SYSTEM_ENTITY);
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if (cmpRangeManager.null())
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return;
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ICmpRangeManager::CLosQuerier los (cmpRangeManager->GetLosQuerier(g_Game->GetPlayerID()));
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GenerateBitmap(los, &losData[0], m_MapSize, m_MapSize);
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g_Renderer.BindTexture(unit, m_Texture);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_MapSize + g_BlurSize - 1, m_MapSize + g_BlurSize - 1, GL_ALPHA, GL_UNSIGNED_BYTE, &losData[0]);
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}
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size_t CLOSTexture::GetBitmapSize(size_t w, size_t h)
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{
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return (w + g_BlurSize - 1) * (h + g_BlurSize - 1);
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}
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void CLOSTexture::GenerateBitmap(ICmpRangeManager::CLosQuerier los, u8* losData, size_t w, size_t h)
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{
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const size_t rowSize = w + g_BlurSize-1; // size of losData rows
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u8 *dataPtr = losData;
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// Initialise the top padding
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for (size_t j = 0; j < g_BlurSize/2; ++j)
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for (size_t i = 0; i < rowSize; ++i)
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*dataPtr++ = 0;
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for (size_t j = 0; j < h; ++j)
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{
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// Initialise the left padding
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for (size_t i = 0; i < g_BlurSize/2; ++i)
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*dataPtr++ = 0;
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// Fill in the visibility data
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for (size_t i = 0; i < w; ++i)
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{
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if (los.IsVisible(i, j))
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*dataPtr++ = 255;
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else if (los.IsExplored(i, j))
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*dataPtr++ = 127;
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else
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*dataPtr++ = 0;
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}
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// Initialise the right padding
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for (size_t i = 0; i < g_BlurSize/2; ++i)
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*dataPtr++ = 0;
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}
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// Initialise the bottom padding
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for (size_t j = 0; j < g_BlurSize/2; ++j)
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for (size_t i = 0; i < rowSize; ++i)
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*dataPtr++ = 0;
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// Horizontal blur:
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for (size_t j = g_BlurSize/2; j < h + g_BlurSize/2; ++j)
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{
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u32 accum = 0; // sum of values in the sliding Nx1 window
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// Initialise the filter window for the first output pixel
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// (Start i at the first of the non-padding pixels, since the
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// padding was set to 0)
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for (size_t i = g_BlurSize/2; i < g_BlurSize-1; ++i)
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accum += losData[i+j*rowSize];
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// For each pixel, update the sliding window and store the average
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// of the window's sum
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for (size_t i = 0; i < w; ++i)
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{
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accum += losData[i+g_BlurSize-1+j*rowSize];
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u8 old = losData[i+j*rowSize];
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losData[i+j*rowSize] = accum / g_BlurSize;
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accum -= old;
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}
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}
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// Vertical blur:
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for (size_t i = 0; i < w; ++i)
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{
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u32 accum = 0;
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for (size_t j = g_BlurSize/2; j < g_BlurSize-1; ++j)
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accum += losData[i+j*rowSize];
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for (size_t j = 0; j < h; ++j)
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{
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accum += losData[i+(j+g_BlurSize-1)*rowSize];
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u8 old = losData[i+j*rowSize];
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losData[i+j*rowSize] = accum / g_BlurSize;
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accum -= old;
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}
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}
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}
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