MiniMap.cpp

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/* Copyright (C) 2013 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "precompiled.h"

#include <math.h>

#include "MiniMap.h"

#include "graphics/GameView.h"
#include "graphics/LOSTexture.h"
#include "graphics/MiniPatch.h"
#include "graphics/Terrain.h"
#include "graphics/TerrainTextureEntry.h"
#include "graphics/TerrainTextureManager.h"
#include "graphics/TerritoryTexture.h"
#include "lib/ogl.h"
#include "lib/external_libraries/libsdl.h"
#include "lib/bits.h"
#include "lib/timer.h"
#include "ps/ConfigDB.h"
#include "ps/Game.h"
#include "ps/Profile.h"
#include "ps/World.h"
#include "renderer/Renderer.h"
#include "renderer/WaterManager.h"
#include "scriptinterface/ScriptInterface.h"
#include "simulation2/Simulation2.h"
#include "simulation2/components/ICmpMinimap.h"
#include "simulation2/system/ParamNode.h"

bool g_GameRestarted = false;

// Set max drawn entities to UINT16_MAX for now, which is more than enough
// TODO: we should be cleverer about drawing them to reduce clutter
const u16 MAX_ENTITIES_DRAWN = 65535;

static unsigned int ScaleColor(unsigned int color, float x)
{
    unsigned int r = unsigned(float(color & 0xff) * x);
    unsigned int g = unsigned(float((color>>8) & 0xff) * x);
    unsigned int b = unsigned(float((color>>16) & 0xff) * x);
    return (0xff000000 | r | g<<8 | b<<16);
}

CMiniMap::CMiniMap() :
    m_TerrainTexture(0), m_TerrainData(0), m_MapSize(0), m_Terrain(0), m_TerrainDirty(true), m_MapScale(1.f),
    m_EntitiesDrawn(0), m_IndexArray(GL_STATIC_DRAW), m_VertexArray(GL_DYNAMIC_DRAW),
    m_NextBlinkTime(0.0), m_PingDuration(25.0), m_BlinkState(false)
{
    AddSetting(GUIST_CColor,    "fov_wedge_color");
    AddSetting(GUIST_CStrW,     "tooltip");
    AddSetting(GUIST_CStr,      "tooltip_style");
    m_Clicking = false;
    m_MouseHovering = false;
    
    // Get the maximum height for unit passage in water.
    CParamNode externalParamNode;
    CParamNode::LoadXML(externalParamNode, L"simulation/data/pathfinder.xml");
    const CParamNode pathingSettings = externalParamNode.GetChild("Pathfinder").GetChild("PassabilityClasses");
    if (pathingSettings.GetChild("default").IsOk() && pathingSettings.GetChild("default").GetChild("MaxWaterDepth").IsOk())
        m_ShallowPassageHeight = pathingSettings.GetChild("default").GetChild("MaxWaterDepth").ToFloat();
    else
        m_ShallowPassageHeight = 0.0f;
        
    m_AttributePos.type = GL_FLOAT;
    m_AttributePos.elems = 2;
    m_VertexArray.AddAttribute(&m_AttributePos);
    
    m_AttributeColor.type = GL_UNSIGNED_BYTE;
    m_AttributeColor.elems = 4;
    m_VertexArray.AddAttribute(&m_AttributeColor);
    
    m_VertexArray.SetNumVertices(MAX_ENTITIES_DRAWN);
    m_VertexArray.Layout();

    m_IndexArray.SetNumVertices(MAX_ENTITIES_DRAWN);
    m_IndexArray.Layout();
    VertexArrayIterator<u16> index = m_IndexArray.GetIterator();
    for (u16 i = 0; i < MAX_ENTITIES_DRAWN; ++i)
    {
        *index++ = i;
    }
    m_IndexArray.Upload();
    m_IndexArray.FreeBackingStore();
    
    
    VertexArrayIterator<float[2]> attrPos = m_AttributePos.GetIterator<float[2]>();
    VertexArrayIterator<u8[4]> attrColor = m_AttributeColor.GetIterator<u8[4]>();
    for (u16 i = 0; i < MAX_ENTITIES_DRAWN; i++)
    {
        (*attrColor)[0] = 0;
        (*attrColor)[1] = 0;
        (*attrColor)[2] = 0;
        (*attrColor)[3] = 0;
        ++attrColor;

        (*attrPos)[0] = -10000.0f;
        (*attrPos)[1] = -10000.0f;
        
        ++attrPos;
        
    }
    m_VertexArray.Upload();

    double blinkDuration = 1.0;

    // Tests won't have config initialised
    if (CConfigDB::IsInitialised())
    {
        CFG_GET_VAL("gui.session.minimap.pingduration", Double, m_PingDuration);
        CFG_GET_VAL("gui.session.minimap.blinkduration", Double, blinkDuration);
    }
    m_HalfBlinkDuration = blinkDuration/2;
}

CMiniMap::~CMiniMap()
{
    Destroy();
}

void CMiniMap::HandleMessage(SGUIMessage &Message)
{
    switch(Message.type)
    {
    case GUIM_MOUSE_PRESS_LEFT:
        {
            if (m_MouseHovering)
            {
                SetCameraPos();
                m_Clicking = true;
            }
            break;
        }
    case GUIM_MOUSE_RELEASE_LEFT:
        {
            if(m_MouseHovering && m_Clicking)
            {
                SetCameraPos();
            }
            m_Clicking = false;
            break;
        }
    case GUIM_MOUSE_DBLCLICK_LEFT:
        {
            if(m_MouseHovering && m_Clicking)
            {
                SetCameraPos();
            }
            m_Clicking = false;
            break;
        }
    case GUIM_MOUSE_ENTER:
        {
            m_MouseHovering = true;
            break;
        }
    case GUIM_MOUSE_LEAVE:
        {
            m_Clicking = false;
            m_MouseHovering = false;
            break;
        }
    case GUIM_MOUSE_RELEASE_RIGHT:
        {
            CMiniMap::FireWorldClickEvent(SDL_BUTTON_RIGHT, 1);
            break;
        }
    case GUIM_MOUSE_DBLCLICK_RIGHT:
        {
            CMiniMap::FireWorldClickEvent(SDL_BUTTON_RIGHT, 2);
            break;
        }
    case GUIM_MOUSE_MOTION:
        {
            if (m_MouseHovering && m_Clicking)
            {
                SetCameraPos();
            }
            break;
        }
    case GUIM_MOUSE_WHEEL_DOWN:
    case GUIM_MOUSE_WHEEL_UP:
        Message.Skip();
        break;

    default:
        break;
    }   // switch
}

void CMiniMap::GetMouseWorldCoordinates(float& x, float& z)
{
    // Determine X and Z according to proportion of mouse position and minimap

    CPos mousePos = GetMousePos();

    float px = (mousePos.x - m_CachedActualSize.left) / m_CachedActualSize.GetWidth();
    float py = (m_CachedActualSize.bottom - mousePos.y) / m_CachedActualSize.GetHeight();

    float angle = GetAngle();

    // Scale world coordinates for shrunken square map
    x = TERRAIN_TILE_SIZE * m_MapSize * (m_MapScale * (cos(angle)*(px-0.5) - sin(angle)*(py-0.5)) + 0.5);
    z = TERRAIN_TILE_SIZE * m_MapSize * (m_MapScale * (cos(angle)*(py-0.5) + sin(angle)*(px-0.5)) + 0.5);
}

void CMiniMap::SetCameraPos()
{
    CTerrain* terrain = g_Game->GetWorld()->GetTerrain();

    CVector3D target;
    GetMouseWorldCoordinates(target.X, target.Z);
    target.Y = terrain->GetExactGroundLevel(target.X, target.Z);
    g_Game->GetView()->MoveCameraTarget(target);
}

float CMiniMap::GetAngle()
{
    CVector3D cameraIn = m_Camera->m_Orientation.GetIn();
    return -atan2(cameraIn.X, cameraIn.Z);
}

void CMiniMap::FireWorldClickEvent(int button, int clicks)
{
    float x, z;
    GetMouseWorldCoordinates(x, z);

    CScriptValRooted coords;
    g_ScriptingHost.GetScriptInterface().Eval("({})", coords);
    g_ScriptingHost.GetScriptInterface().SetProperty(coords.get(), "x", x, false);
    g_ScriptingHost.GetScriptInterface().SetProperty(coords.get(), "z", z, false);
    ScriptEvent("worldclick", coords);

    UNUSED2(button);
    UNUSED2(clicks);
}

#if CONFIG2_GLES
#warning TODO: implement minimap for GLES
void CMiniMap::Draw()
{
}
#else

// render view rect : John M. Mena
// This sets up and draws the rectangle on the mini-map
// which represents the view of the camera in the world.
void CMiniMap::DrawViewRect()
{
    // Compute the camera frustum intersected with a fixed-height plane.
    // TODO: Currently we hard-code the height, so this'll be dodgy when maps aren't the
    // expected height - how can we make it better without the view rect wobbling in
    // size while the player scrolls?
    float h = 16384.f * HEIGHT_SCALE;

    CVector3D hitPt[4];
    hitPt[0]=m_Camera->GetWorldCoordinates(0, g_Renderer.GetHeight(), h);
    hitPt[1]=m_Camera->GetWorldCoordinates(g_Renderer.GetWidth(), g_Renderer.GetHeight(), h);
    hitPt[2]=m_Camera->GetWorldCoordinates(g_Renderer.GetWidth(), 0, h);
    hitPt[3]=m_Camera->GetWorldCoordinates(0, 0, h);

    float ViewRect[4][2];
    const float invTileMapSize = 1.0f/float(TERRAIN_TILE_SIZE*m_MapSize);
    for (int i=0;i<4;i++) {
        // convert to minimap space
        const float px=hitPt[i].X;
        const float pz=hitPt[i].Z;
        ViewRect[i][0]=(m_CachedActualSize.GetWidth()*px*invTileMapSize);
        ViewRect[i][1]=(m_CachedActualSize.GetHeight()*pz*invTileMapSize);
    }

    // Enable Scissoring as to restrict the rectangle
    // to only the mini-map below by retrieving the mini-maps
    // screen coords.
    const float x = m_CachedActualSize.left, y = m_CachedActualSize.bottom;
    glScissor((int)x, g_Renderer.GetHeight()-(int)y, (int)m_CachedActualSize.GetWidth(), (int)m_CachedActualSize.GetHeight());
    glEnable(GL_SCISSOR_TEST);
    glEnable(GL_LINE_SMOOTH);
    glLineWidth(2.0f);
    glColor3f(1.0f, 0.3f, 0.3f);

    // Draw the viewing rectangle with the ScEd's conversion algorithm
    glBegin(GL_LINE_LOOP);
    glVertex2f(ViewRect[0][0], -ViewRect[0][1]);
    glVertex2f(ViewRect[1][0], -ViewRect[1][1]);
    glVertex2f(ViewRect[2][0], -ViewRect[2][1]);
    glVertex2f(ViewRect[3][0], -ViewRect[3][1]);
    glEnd();

    // restore state
    glDisable(GL_SCISSOR_TEST);
    glDisable(GL_LINE_SMOOTH);
    glLineWidth(1.0f);
}

struct MinimapUnitVertex
{
    u8 r, g, b, a;
    float x, y;
};

// Adds a vertex to the passed VertexArray
static void inline addVertex(const MinimapUnitVertex& v,
                      VertexArrayIterator<u8[4]>& attrColor,
                      VertexArrayIterator<float[2]>& attrPos)
{
    (*attrColor)[0] = v.r;
    (*attrColor)[1] = v.g;
    (*attrColor)[2] = v.b;
    (*attrColor)[3] = v.a;
    ++attrColor;

    (*attrPos)[0] = v.x;
    (*attrPos)[1] = v.y;

    ++attrPos;
}


void CMiniMap::DrawTexture(float coordMax, float angle, float x, float y, float x2, float y2, float z)
{
    // Rotate the texture coordinates (0,0)-(coordMax,coordMax) around their center point (m,m)
    // Scale square maps to fit in circular minimap area
    const float s = sin(angle) * m_MapScale;
    const float c = cos(angle) * m_MapScale;
    const float m = coordMax / 2.f;

    glBegin(GL_QUADS);
    glTexCoord2f(m*(-c + s + 1.f), m*(-c + -s + 1.f));
    glVertex3f(x, y, z);
    glTexCoord2f(m*(c + s + 1.f), m*(-c + s + 1.f));
    glVertex3f(x2, y, z);
    glTexCoord2f(m*(c + -s + 1.f), m*(c + s + 1.f));
    glVertex3f(x2, y2, z);
    glTexCoord2f(m*(-c + -s + 1.f), m*(c + -s + 1.f));
    glVertex3f(x, y2, z);
    glEnd();
}

// TODO: render the minimap in a framebuffer and just draw the frambuffer texture
//  most of the time, updating the framebuffer twice a frame.
// Here it updates as ping-pong either texture or vertex array each sec to lower gpu stalling
// (those operations cause a gpu sync, which slows down the way gpu works)
void CMiniMap::Draw()
{
    PROFILE3("render minimap");

    // The terrain isn't actually initialized until the map is loaded, which
    // happens when the game is started, so abort until then.
    if(!(GetGUI() && g_Game && g_Game->IsGameStarted()))
        return;

    CSimulation2* sim = g_Game->GetSimulation2();
    CmpPtr<ICmpRangeManager> cmpRangeManager(*sim, SYSTEM_ENTITY);
    ENSURE(cmpRangeManager);

    // Set our globals in case they hadn't been set before
    m_Camera      = g_Game->GetView()->GetCamera();
    m_Terrain     = g_Game->GetWorld()->GetTerrain();
    m_Width  = (u32)(m_CachedActualSize.right - m_CachedActualSize.left);
    m_Height = (u32)(m_CachedActualSize.bottom - m_CachedActualSize.top);
    m_MapSize = m_Terrain->GetVerticesPerSide();
    m_TextureSize = (GLsizei)round_up_to_pow2((size_t)m_MapSize);
    m_MapScale = (cmpRangeManager->GetLosCircular() ? 1.f : 1.414f);

    if(!m_TerrainTexture || g_GameRestarted)
        CreateTextures();


    // only update 2x / second
    // (note: since units only move a few pixels per second on the minimap,
    // we can get away with infrequent updates; this is slow)
    // TODO: store frequency in a config file?
    static double last_time;
    const double cur_time = timer_Time();
    const bool doUpdate = cur_time - last_time > 0.5;
    if(doUpdate)
    {   
        last_time = cur_time;
        if(m_TerrainDirty)
            RebuildTerrainTexture();
    }

    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glLoadIdentity();
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();
    CMatrix3D matrix = GetDefaultGuiMatrix();
    glLoadMatrixf(&matrix._11);

    // Disable depth updates to prevent apparent z-fighting-related issues
    // with some drivers causing units to get drawn behind the texture
    glDepthMask(0);
    
    CShaderProgramPtr shader;
    CShaderTechniquePtr tech;
    
    if (g_Renderer.GetRenderPath() == CRenderer::RP_SHADER)
    {
        CShaderDefines defines;
        defines.Add(str_MINIMAP_BASE, str_1);
        tech = g_Renderer.GetShaderManager().LoadEffect(str_minimap, g_Renderer.GetSystemShaderDefines(), defines);
        tech->BeginPass();
        shader = tech->GetShader();
    }

    const float x = m_CachedActualSize.left, y = m_CachedActualSize.bottom;
    const float x2 = m_CachedActualSize.right, y2 = m_CachedActualSize.top;
    const float z = GetBufferedZ();
    const float texCoordMax = (float)(m_MapSize - 1) / (float)m_TextureSize;
    const float angle = GetAngle();

    // Draw the main textured quad
    if (g_Renderer.GetRenderPath() == CRenderer::RP_SHADER)
        shader->BindTexture(str_baseTex, m_TerrainTexture);
    else
        g_Renderer.BindTexture(0, m_TerrainTexture);
    
    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    DrawTexture(texCoordMax, angle, x, y, x2, y2, z);


    // Draw territory boundaries
    CTerritoryTexture& territoryTexture = g_Game->GetView()->GetTerritoryTexture();
    
    if (g_Renderer.GetRenderPath() == CRenderer::RP_SHADER)
        shader->BindTexture(str_baseTex, territoryTexture.GetTexture());
    else
        territoryTexture.BindTexture(0);
    
    glEnable(GL_BLEND);
    glMatrixMode(GL_TEXTURE);
    glLoadMatrixf(territoryTexture.GetMinimapTextureMatrix());
    glMatrixMode(GL_MODELVIEW);

    DrawTexture(1.0f, angle, x, y, x2, y2, z);

    glMatrixMode(GL_TEXTURE);
    glLoadIdentity();
    glMatrixMode(GL_MODELVIEW);
    glDisable(GL_BLEND);


    // Draw the LOS quad in black, using alpha values from the LOS texture
    CLOSTexture& losTexture = g_Game->GetView()->GetLOSTexture();
    
    if (g_Renderer.GetRenderPath() == CRenderer::RP_SHADER)
    {
        tech->EndPass();

        CShaderDefines defines;
        defines.Add(str_MINIMAP_LOS, str_1);
        tech = g_Renderer.GetShaderManager().LoadEffect(str_minimap, g_Renderer.GetSystemShaderDefines(), defines);
        tech->BeginPass();
        shader = tech->GetShader();
        shader->BindTexture(str_baseTex, losTexture.GetTexture());
    }
    else
    {
        losTexture.BindTexture(0);
    }
    
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_REPLACE);
    glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_PRIMARY_COLOR_ARB);
    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA_ARB, GL_REPLACE);
    glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA_ARB, GL_TEXTURE);
    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA_ARB, GL_ONE_MINUS_SRC_ALPHA);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glColor3f(0.0f, 0.0f, 0.0f);

    glMatrixMode(GL_TEXTURE);
    glLoadMatrixf(losTexture.GetMinimapTextureMatrix());
    glMatrixMode(GL_MODELVIEW);

    DrawTexture(1.0f, angle, x, y, x2, y2, z);

    glMatrixMode(GL_TEXTURE);
    glLoadIdentity();
    glMatrixMode(GL_MODELVIEW);

    glDisable(GL_BLEND);
    
    if (g_Renderer.GetRenderPath() == CRenderer::RP_SHADER)
    {
        tech->EndPass();

        CShaderDefines defines;
        defines.Add(str_MINIMAP_POINT, str_1);
        tech = g_Renderer.GetShaderManager().LoadEffect(str_minimap, g_Renderer.GetSystemShaderDefines(), defines);
        tech->BeginPass();
        shader = tech->GetShader();
    }
    
    // Set up the matrix for drawing points and lines
    glPushMatrix();
    glTranslatef(x, y, z);
    // Rotate around the center of the map
    glTranslatef((x2-x)/2.f, (y2-y)/2.f, 0.f);
    // Scale square maps to fit in circular minimap area
    float unitScale = (cmpRangeManager->GetLosCircular() ? 1.f : m_MapScale/2.f);
    glScalef(unitScale, unitScale, 1.f);
    glRotatef(angle * 180.f/M_PI, 0.f, 0.f, 1.f);
    glTranslatef(-(x2-x)/2.f, -(y2-y)/2.f, 0.f);

    PROFILE_START("minimap units");


    const float sx = (float)m_Width / ((m_MapSize - 1) * TERRAIN_TILE_SIZE);
    const float sy = (float)m_Height / ((m_MapSize - 1) * TERRAIN_TILE_SIZE);

    CSimulation2::InterfaceList ents = sim->GetEntitiesWithInterface(IID_Minimap);

    if (doUpdate)
    {

        VertexArrayIterator<float[2]> attrPos = m_AttributePos.GetIterator<float[2]>();
        VertexArrayIterator<u8[4]> attrColor = m_AttributeColor.GetIterator<u8[4]>();

        m_EntitiesDrawn = 0;
        MinimapUnitVertex v;
        std::vector<MinimapUnitVertex> pingingVertices;
        pingingVertices.reserve(MAX_ENTITIES_DRAWN/2);

        const double time = timer_Time();

        if (time > m_NextBlinkTime)
        {
            m_BlinkState = !m_BlinkState;
            m_NextBlinkTime = time + m_HalfBlinkDuration;
        }

        entity_pos_t posX, posZ;
        for (CSimulation2::InterfaceList::const_iterator it = ents.begin(); it != ents.end(); ++it)
        {
            ICmpMinimap* cmpMinimap = static_cast<ICmpMinimap*>(it->second);
            if (cmpMinimap->GetRenderData(v.r, v.g, v.b, posX, posZ))
            {
                ICmpRangeManager::ELosVisibility vis = cmpRangeManager->GetLosVisibility(it->first, g_Game->GetPlayerID());
                if (vis != ICmpRangeManager::VIS_HIDDEN)
                {
                    v.a = 255;
                    v.x = posX.ToFloat()*sx;
                    v.y = -posZ.ToFloat()*sy;
                    
                    // Check minimap pinging to indicate something
                    if (m_BlinkState && cmpMinimap->CheckPing(time, m_PingDuration))
                    {
                        v.r = 255; // ping color is white
                        v.g = 255;
                        v.b = 255;

                        pingingVertices.push_back(v);
                    }
                    else
                    {
                        addVertex(v, attrColor, attrPos);
                        ++m_EntitiesDrawn;
                    }
                }
            }
        }

        // Add the pinged vertices at the end, so they are drawn on top
        for (size_t v = 0; v < pingingVertices.size(); ++v)
        {
            addVertex(pingingVertices[v], attrColor, attrPos);
            ++m_EntitiesDrawn;
        }

        ENSURE(m_EntitiesDrawn < MAX_ENTITIES_DRAWN);
        m_VertexArray.Upload();
    }

    if (m_EntitiesDrawn > 0)
    {       
        // Don't enable GL_POINT_SMOOTH because it's far too slow
        // (~70msec/frame on a GF4 rendering a thousand points)
        glPointSize(3.f);

        u8* indexBase = m_IndexArray.Bind();
        u8* base = m_VertexArray.Bind();
        const GLsizei stride = (GLsizei)m_VertexArray.GetStride();

        if (g_Renderer.GetRenderPath() == CRenderer::RP_SHADER)
        {
            shader->VertexPointer(2, GL_FLOAT, stride, base + m_AttributePos.offset);
            shader->ColorPointer(4, GL_UNSIGNED_BYTE, stride, base + m_AttributeColor.offset);
            shader->AssertPointersBound();
        }
        else
        {   
            glEnableClientState(GL_VERTEX_ARRAY);
            glEnableClientState(GL_COLOR_ARRAY);

            glDisable(GL_TEXTURE_2D);
            glVertexPointer(2, GL_FLOAT, stride, base + m_AttributePos.offset);
            glColorPointer(4, GL_UNSIGNED_BYTE, stride, base + m_AttributeColor.offset);
        }
        
        if (!g_Renderer.m_SkipSubmit)
        {
            glDrawElements(GL_POINTS, (GLsizei)(m_EntitiesDrawn), GL_UNSIGNED_SHORT, indexBase);
        }

        
        g_Renderer.GetStats().m_DrawCalls++;
        CVertexBuffer::Unbind();
    }

    PROFILE_END("minimap units");

    if (g_Renderer.GetRenderPath() == CRenderer::RP_SHADER)
    {
        tech->EndPass();

        CShaderDefines defines;
        defines.Add(str_MINIMAP_LINE, str_1);
        tech = g_Renderer.GetShaderManager().LoadEffect(str_minimap, g_Renderer.GetSystemShaderDefines(), defines);
        tech->BeginPass();
        shader = tech->GetShader();
    }
    else
    {
        glEnable(GL_TEXTURE_2D);
        glDisableClientState(GL_VERTEX_ARRAY);
        glDisableClientState(GL_COLOR_ARRAY);
    }

    DrawViewRect();

    glPopMatrix();
    
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
    glMatrixMode(GL_MODELVIEW);
    glPopMatrix();
    
    if (g_Renderer.GetRenderPath() == CRenderer::RP_SHADER)
    {
        tech->EndPass();
    }

    // Reset everything back to normal
    glPointSize(1.0f);
    glEnable(GL_TEXTURE_2D);
    glDepthMask(1);
}

#endif // CONFIG2_GLES

void CMiniMap::CreateTextures()
{
    Destroy();

    // Create terrain texture
    glGenTextures(1, &m_TerrainTexture);
    g_Renderer.BindTexture(0, m_TerrainTexture);

    // Initialise texture with solid black, for the areas we don't
    // overwrite with glTexSubImage2D later
    u32* texData = new u32[m_TextureSize * m_TextureSize];
    for (ssize_t i = 0; i < m_TextureSize * m_TextureSize; ++i)
        texData[i] = 0xFF000000;
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, m_TextureSize, m_TextureSize, 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, texData);
    delete[] texData;

    m_TerrainData = new u32[(m_MapSize - 1) * (m_MapSize - 1)];
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

    // Rebuild and upload both of them
    RebuildTerrainTexture();
}


void CMiniMap::RebuildTerrainTexture()
{
    u32 x = 0;
    u32 y = 0;
    u32 w = m_MapSize - 1;
    u32 h = m_MapSize - 1;
    float waterHeight = g_Renderer.GetWaterManager()->m_WaterHeight;

    m_TerrainDirty = false;

    for(u32 j = 0; j < h; j++)
    {
        u32 *dataPtr = m_TerrainData + ((y + j) * (m_MapSize - 1)) + x;
        for(u32 i = 0; i < w; i++)
        {
            float avgHeight = ( m_Terrain->GetVertexGroundLevel((int)i, (int)j)
                    + m_Terrain->GetVertexGroundLevel((int)i+1, (int)j)
                    + m_Terrain->GetVertexGroundLevel((int)i, (int)j+1)
                    + m_Terrain->GetVertexGroundLevel((int)i+1, (int)j+1)
                ) / 4.0f;

            if(avgHeight < waterHeight && avgHeight > waterHeight - m_ShallowPassageHeight)
            {
                // shallow water
                *dataPtr++ = 0xff7098c0;
            } else if (avgHeight < waterHeight)
            {
                // Set water as constant color for consistency on different maps
                *dataPtr++ = 0xff5078a0;
            }
            else
            {
                int hmap = ((int)m_Terrain->GetHeightMap()[(y + j) * m_MapSize + x + i]) >> 8;
                int val = (hmap / 3) + 170;

                u32 color = 0xFFFFFFFF;

                CMiniPatch *mp = m_Terrain->GetTile(x + i, y + j);
                if(mp)
                {
                    CTerrainTextureEntry *tex = mp->GetTextureEntry();
                    if(tex)
                    {
                        // If the texture can't be loaded yet, set the dirty flags
                        // so we'll try regenerating the terrain texture again soon
                        if(!tex->GetTexture()->TryLoad())
                            m_TerrainDirty = true;

                        color = tex->GetBaseColor();
                    }
                }

                *dataPtr++ = ScaleColor(color, float(val) / 255.0f);
            }
        }
    }

    // Upload the texture
    g_Renderer.BindTexture(0, m_TerrainTexture);
    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, m_MapSize - 1, m_MapSize - 1, GL_BGRA_EXT, GL_UNSIGNED_BYTE, m_TerrainData);
}

void CMiniMap::Destroy()
{
    if(m_TerrainTexture)
    {
        glDeleteTextures(1, &m_TerrainTexture);
        m_TerrainTexture = 0;
    }

    delete[] m_TerrainData;
    m_TerrainData = 0;
}