forked from 0ad/0ad
Ykkrosh
29dd635d3b
Fix particles in Actor Viewer. Expand terrain in Actor Viewer. Change background to black so it blends with the LOS texture more nicely. This was SVN commit r9172.
253 lines
6.3 KiB
C++
253 lines
6.3 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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#include "simulation2/components/ICmpTerrain.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 filter (in particular a
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7-tap Binomial filter as an efficient integral approximation of a Gaussian).
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To implement the blur efficiently without using extra memory for a second copy
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of the bitmap, we generate the bitmap with (N-1)/2 pixels of padding on each side,
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then the blur shifts the 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 filter, where N = g_BlurSize must be an odd number.
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static const size_t g_BlurSize = 7;
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CLOSTexture::CLOSTexture(CSimulation2& simulation) :
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m_Simulation(simulation), 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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GLuint CLOSTexture::GetTexture()
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{
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if (m_Dirty)
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{
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RecomputeTexture(0);
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m_Dirty = false;
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}
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return 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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CmpPtr<ICmpTerrain> cmpTerrain(m_Simulation, SYSTEM_ENTITY);
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if (cmpTerrain.null())
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return;
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m_MapSize = cmpTerrain->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(m_Simulation, 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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for (size_t i = 0; i < w; ++i)
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{
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u8* d = &losData[i+j*rowSize];
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*d = (
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1*d[0] +
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6*d[1] +
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15*d[2] +
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20*d[3] +
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15*d[4] +
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6*d[5] +
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1*d[6]
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) / 64;
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}
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}
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// Vertical blur:
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for (size_t j = 0; j < h; ++j)
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{
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for (size_t i = 0; i < w; ++i)
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{
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u8* d = &losData[i+j*rowSize];
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*d = (
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1*d[0*rowSize] +
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6*d[1*rowSize] +
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15*d[2*rowSize] +
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20*d[3*rowSize] +
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15*d[4*rowSize] +
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6*d[5*rowSize] +
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1*d[6*rowSize]
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) / 64;
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}
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}
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}
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