wraitii
d8ea401a95
Introduce a LOS_TILE_SIZE, to replace usage of TERRITORY_TILE_SIZE in the LOS code. This makes it possible to change the resolution of LOS/Terrain without affecting the other component. Additional refactoring: - LosTile has been renamed LosRegion (it's more comparable to the hierarchical pathfinder regions/spatial subdivisions) - LosState explicitly refers to "los vertices" instead of terrain vertices. Refs #5566 Differential Revision: https://code.wildfiregames.com/D3076 This was SVN commit r24980.
439 lines
12 KiB
C++
439 lines
12 KiB
C++
/* Copyright (C) 2020 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/ShaderManager.h"
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#include "lib/bits.h"
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#include "lib/config2.h"
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#include "ps/CLogger.h"
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#include "ps/Game.h"
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#include "ps/Profile.h"
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#include "renderer/Renderer.h"
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#include "renderer/RenderingOptions.h"
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#include "renderer/TimeManager.h"
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#include "simulation2/Simulation2.h"
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#include "simulation2/components/ICmpRangeManager.h"
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#include "simulation2/helpers/Los.h"
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/*
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The LOS bitmap is computed with one value per LOS 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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// Keep it in relation to the number of impassable tiles in MAP_EDGE_TILES.
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static const size_t g_BlurSize = 7;
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// Alignment (in bytes) of the pixel data passed into glTexSubImage2D.
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// This must be a multiple of GL_UNPACK_ALIGNMENT, which ought to be 1 (since
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// that's what we set it to) but in some weird cases appears to have a different
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// value. (See Trac #2594). Multiples of 4 are possibly good for performance anyway.
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static const size_t g_SubTextureAlignment = 4;
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CLOSTexture::CLOSTexture(CSimulation2& simulation)
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: m_Simulation(simulation), m_Dirty(true), m_ShaderInitialized(false),
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m_Texture(0), m_TextureSmooth1(0), m_TextureSmooth2(0), m_smoothFbo(0),
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m_MapSize(0), m_TextureSize(0), whichTex(true)
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{
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if (CRenderer::IsInitialised() && g_RenderingOptions.GetSmoothLOS())
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CreateShader();
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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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DeleteTexture();
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}
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// Create the LOS texture engine. Should be ran only once.
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bool CLOSTexture::CreateShader()
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{
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m_smoothShader = g_Renderer.GetShaderManager().LoadEffect(str_los_interp);
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CShaderProgramPtr shader = m_smoothShader->GetShader();
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m_ShaderInitialized = m_smoothShader && shader;
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if (!m_ShaderInitialized)
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{
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LOGERROR("Failed to load SmoothLOS shader, disabling.");
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g_RenderingOptions.SetSmoothLOS(false);
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return false;
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}
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pglGenFramebuffersEXT(1, &m_smoothFbo);
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return true;
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}
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void CLOSTexture::DeleteTexture()
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{
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glDeleteTextures(1, &m_Texture);
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if (m_TextureSmooth1)
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glDeleteTextures(1, &m_TextureSmooth1);
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if (m_TextureSmooth2)
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glDeleteTextures(1, &m_TextureSmooth2);
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m_Texture = 0;
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m_TextureSmooth1 = 0;
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m_TextureSmooth2 = 0;
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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::GetTextureSmooth()
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{
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if (CRenderer::IsInitialised() && !g_RenderingOptions.GetSmoothLOS())
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return GetTexture();
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else
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return whichTex ? m_TextureSmooth1 : m_TextureSmooth2;
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}
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void CLOSTexture::InterpolateLOS()
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{
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if (CRenderer::IsInitialised() && !g_RenderingOptions.GetSmoothLOS())
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return;
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if (!m_ShaderInitialized)
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{
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if (!CreateShader())
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return;
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// RecomputeTexture(0) will not cause the ConstructTexture to run.
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// Force the textures to be created.
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DeleteTexture();
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ConstructTexture(0);
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m_Dirty = true;
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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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pglBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_smoothFbo);
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pglFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D,
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whichTex ? m_TextureSmooth2 : m_TextureSmooth1, 0);
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GLenum status = pglCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
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if (status != GL_FRAMEBUFFER_COMPLETE_EXT)
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{
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LOGWARNING("LOS framebuffer object incomplete: 0x%04X", status);
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}
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m_smoothShader->BeginPass();
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CShaderProgramPtr shader = m_smoothShader->GetShader();
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glDisable(GL_BLEND);
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shader->Bind();
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shader->BindTexture(str_losTex1, m_Texture);
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shader->BindTexture(str_losTex2, whichTex ? m_TextureSmooth1 : m_TextureSmooth2);
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shader->Uniform(str_delta, (float)g_Renderer.GetTimeManager().GetFrameDelta() * 4.0f, 0.0f, 0.0f, 0.0f);
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const SViewPort oldVp = g_Renderer.GetViewport();
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const SViewPort vp = { 0, 0, m_TextureSize, m_TextureSize };
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g_Renderer.SetViewport(vp);
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float quadVerts[] = {
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1.0f, 1.0f,
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-1.0f, 1.0f,
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-1.0f, -1.0f,
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-1.0f, -1.0f,
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1.0f, -1.0f,
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1.0f, 1.0f
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};
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float quadTex[] = {
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1.0f, 1.0f,
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0.0f, 1.0f,
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0.0f, 0.0f,
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0.0f, 0.0f,
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1.0f, 0.0f,
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1.0f, 1.0f
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};
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shader->TexCoordPointer(GL_TEXTURE0, 2, GL_FLOAT, 0, quadTex);
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shader->VertexPointer(2, GL_FLOAT, 0, quadVerts);
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shader->AssertPointersBound();
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glDrawArrays(GL_TRIANGLES, 0, 6);
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g_Renderer.SetViewport(oldVp);
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shader->Unbind();
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m_smoothShader->EndPass();
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pglFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, 0, 0);
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pglBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
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whichTex = !whichTex;
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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 CMatrix3D& CLOSTexture::GetTextureMatrix()
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{
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ENSURE(!m_Dirty);
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return m_TextureMatrix;
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}
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const CMatrix3D* CLOSTexture::GetMinimapTextureMatrix()
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{
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ENSURE(!m_Dirty);
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return &m_MinimapTextureMatrix;
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}
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void CLOSTexture::ConstructTexture(int unit)
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{
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CmpPtr<ICmpRangeManager> cmpRangeManager(m_Simulation, SYSTEM_ENTITY);
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if (!cmpRangeManager)
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return;
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m_MapSize = cmpRangeManager->GetVerticesPerSide();
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m_TextureSize = (GLsizei)round_up_to_pow2(round_up((size_t)m_MapSize + g_BlurSize - 1, g_SubTextureAlignment));
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glGenTextures(1, &m_Texture);
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// Initialise texture with SoD color, for the areas we don't
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// overwrite with glTexSubImage2D later
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u8* texData = new u8[m_TextureSize * m_TextureSize * 4];
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memset(texData, 0x00, m_TextureSize * m_TextureSize * 4);
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if (CRenderer::IsInitialised() && g_RenderingOptions.GetSmoothLOS())
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{
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glGenTextures(1, &m_TextureSmooth1);
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glGenTextures(1, &m_TextureSmooth2);
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g_Renderer.BindTexture(unit, m_TextureSmooth1);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_TextureSize, m_TextureSize, 0, GL_ALPHA, GL_UNSIGNED_BYTE, texData);
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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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g_Renderer.BindTexture(unit, m_TextureSmooth2);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_TextureSize, m_TextureSize, 0, GL_ALPHA, GL_UNSIGNED_BYTE, texData);
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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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g_Renderer.BindTexture(unit, m_Texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, m_TextureSize, m_TextureSize, 0, GL_ALPHA, GL_UNSIGNED_BYTE, texData);
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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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delete[] texData;
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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) * LOS_TILE_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 the map was resized, delete and regenerate the texture
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if (m_Texture)
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{
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CmpPtr<ICmpRangeManager> cmpRangeManager(m_Simulation, SYSTEM_ENTITY);
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if (!cmpRangeManager || m_MapSize != cmpRangeManager->GetVerticesPerSide())
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DeleteTexture();
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}
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bool recreated = false;
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if (!m_Texture)
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{
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ConstructTexture(unit);
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recreated = true;
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}
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PROFILE("recompute LOS texture");
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std::vector<u8> losData;
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size_t pitch;
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losData.resize(GetBitmapSize(m_MapSize, m_MapSize, &pitch));
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CmpPtr<ICmpRangeManager> cmpRangeManager(m_Simulation, SYSTEM_ENTITY);
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if (!cmpRangeManager)
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return;
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CLosQuerier los(cmpRangeManager->GetLosQuerier(g_Game->GetSimulation2()->GetSimContext().GetCurrentDisplayedPlayer()));
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GenerateBitmap(los, &losData[0], m_MapSize, m_MapSize, pitch);
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if (CRenderer::IsInitialised() && g_RenderingOptions.GetSmoothLOS() && recreated)
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{
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g_Renderer.BindTexture(unit, m_TextureSmooth1);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, pitch, m_MapSize, GL_ALPHA, GL_UNSIGNED_BYTE, &losData[0]);
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g_Renderer.BindTexture(unit, m_TextureSmooth2);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, pitch, m_MapSize, GL_ALPHA, GL_UNSIGNED_BYTE, &losData[0]);
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}
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g_Renderer.BindTexture(unit, m_Texture);
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glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, pitch, m_MapSize, 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, size_t* pitch)
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{
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*pitch = round_up(w + g_BlurSize - 1, g_SubTextureAlignment);
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return *pitch * (h + g_BlurSize - 1);
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}
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void CLOSTexture::GenerateBitmap(const CLosQuerier& los, u8* losData, size_t w, size_t h, size_t pitch)
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{
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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 < pitch; ++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_UncheckedRange(i, j))
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*dataPtr++ = 255;
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else if (los.IsExplored_UncheckedRange(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 < pitch - w - 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 < pitch; ++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*pitch];
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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*pitch];
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*d = (
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1*d[0*pitch] +
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6*d[1*pitch] +
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15*d[2*pitch] +
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20*d[3*pitch] +
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15*d[4*pitch] +
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6*d[5*pitch] +
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1*d[6*pitch]
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) / 64;
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}
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}
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}
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