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terrain.cpp
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terrain.cpp
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/*
This file is part of Warzone 2100.
Copyright (C) 1999-2004 Eidos Interactive
Copyright (C) 2005-2020 Warzone 2100 Project
Warzone 2100 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.
Warzone 2100 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 Warzone 2100; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file terrain.c
* Draws the terrain.
* It uses the ground property of every MAPTILE to divide the terrain into different layers.
* For every layer the GROUND_TYPE (from psGroundTypes) determines the texture and size.
* The technique used it called "texture splatting".
* Every layer only draws the spots where that terrain is, and additive blending is used to make transitions smooth.
* Decals are a kind of hack now, as for some tiles (where decal == true) the old tile is just drawn.
* The water is drawn using the hardcoded page-80 and page-81 textures.
*/
#include <string.h>
#include "lib/framework/frame.h"
#include "lib/framework/frameresource.h"
#include "lib/framework/opengl.h"
#include "lib/framework/physfs_ext.h"
#include "lib/ivis_opengl/ivisdef.h"
#include "lib/ivis_opengl/imd.h"
#include "lib/ivis_opengl/piefunc.h"
#include "lib/ivis_opengl/tex.h"
#include "lib/ivis_opengl/pietypes.h"
#include "lib/ivis_opengl/pieclip.h"
#include "lib/ivis_opengl/piestate.h"
#include "lib/ivis_opengl/screen.h"
#include "lib/ivis_opengl/piematrix.h"
#include "lib/ivis_opengl/piedraw.h"
#include <glm/mat4x4.hpp>
#ifndef GLM_ENABLE_EXPERIMENTAL
#define GLM_ENABLE_EXPERIMENTAL
#endif
#include <glm/gtx/transform.hpp>
#include "terrain.h"
#include "map.h"
#include "texture.h"
#include "display3d.h"
#include "hci.h"
#include "loop.h"
// TODO: Fix and remove after merging terrain rendering changes
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wfloat-conversion"
#elif defined(__GNUC__)
#pragma GCC diagnostic ignored "-Wfloat-conversion"
#endif
/**
* A sector contains all information to draw a square piece of the map.
* The actual geometry and texture data is not stored in here but in large VBO's.
* The sector only stores the index and length of the pieces it's going to use.
*/
struct Sector
{
int geometryOffset; ///< The point in the geometry VBO where our geometry starts
int geometrySize; ///< The size of our geometry
int geometryIndexOffset; ///< The point in the index VBO where our triangles start
int geometryIndexSize; ///< The size of our indices
int waterOffset; ///< The point in the water VBO where the water geometry starts
int waterSize; ///< The size of the water geometry
int waterIndexOffset; ///< The point in the water index VBO where the water triangles start
int waterIndexSize; ///< The size of our water triangles
std::unique_ptr<int[]> textureOffset; ///< An array containing the offsets into the texture VBO for each terrain layer
std::unique_ptr<int[]> textureSize; ///< The size of the geometry for this layer for each layer
std::unique_ptr<int[]> textureIndexOffset; ///< The offset into the index VBO for the texture for each layer
std::unique_ptr<int[]> textureIndexSize; ///< The size of the indices for each layer
int decalOffset = 0; ///< Index into the decal VBO
int decalSize = 0; ///< Size of the part of the decal VBO we are going to use
int terrainAndDecalOffset = 0;
int terrainAndDecalSize = 0;
bool draw; ///< Do we draw this sector this frame?
bool dirty; ///< Do we need to update the geometry for this sector?
};
// VBO for gfx_api::TerrainLayer and TerrainDepth
struct TerrainVertex
{
Vector3f pos = Vector3f(0.f, 0.f, 0.f);
};
/// A vertex with a position and texture coordinates
struct DecalVertex
{
Vector3f pos = Vector3f(0.f, 0.f, 0.f);
Vector2f uv = Vector2f(0.f, 0.f);
};
using WaterVertex = glm::vec4; // w is depth
/// The lightmap texture
static gfx_api::texture* lightmap_texture = nullptr;
/// When are we going to update the lightmap next?
static unsigned int lightmapLastUpdate;
/// How big is the lightmap?
static size_t lightmapWidth;
static size_t lightmapHeight;
/// Lightmap image
static std::unique_ptr<iV_Image> lightmapPixmap;
/// Ticks per lightmap refresh
static const unsigned int LIGHTMAP_REFRESH = 80;
/// VBOs
static gfx_api::buffer *geometryVBO = nullptr, *geometryIndexVBO = nullptr, *textureVBO = nullptr, *textureIndexVBO = nullptr, *decalVBO = nullptr;
/// VBOs
static gfx_api::buffer *waterVBO = nullptr, *waterIndexVBO = nullptr;
static gfx_api::buffer *terrainDecalVBO = nullptr;
/// The amount we shift the water textures so the waves appear to be moving
static float waterOffset;
/// These are properties of your videocard and hardware
static int32_t GLmaxElementsVertices, GLmaxElementsIndices;
/// The sectors are stored here
static std::unique_ptr<Sector[]> sectors;
/// The default sector size (a sector is sectorSize x sectorSize)
static int sectorSize = 15;
/// What is the distance we can see
static int terrainDistance;
/// How many sectors have we actually got?
static int xSectors, ySectors;
/// Did we initialise the terrain renderer yet?
static bool terrainInitialised = false;
/// Helper to specify the offset in a VBO
#define BUFFER_OFFSET(i) (reinterpret_cast<char *>(i))
/// Helper variables for the DrawRangeElements functions
GLuint dreStart, dreEnd, dreOffset;
GLsizei dreCount;
/// Are we actually drawing something using the DrawRangeElements functions?
bool drawRangeElementsStarted = false;
TerrainShaderQuality terrainShaderQuality = TerrainShaderQuality::NORMAL_MAPPING;
TerrainShaderType terrainShaderType = TerrainShaderType::SINGLE_PASS;
bool initializedTerrainShaderType = false;
void drawWaterClassic(const glm::mat4 &ModelViewProjection, const glm::mat4 &ModelUVLightmap, const Vector3f &cameraPos, const Vector3f &sunPos);
#define MIN_TERRAIN_TEXTURE_SIZE 512
/// Pass all remaining triangles to OpenGL
template<typename PSO>
static void finishDrawRangeElements()
{
if (drawRangeElementsStarted && dreCount > 0)
{
ASSERT(dreEnd - dreStart + 1 <= GLmaxElementsVertices, "too many vertices (%i)", (int)(dreEnd - dreStart + 1));
ASSERT(dreCount <= GLmaxElementsIndices, "too many indices (%i)", (int)dreCount);
PSO::get().draw_elements(dreCount, sizeof(GLuint)*dreOffset);
}
drawRangeElementsStarted = false;
}
/**
* Either draw the elements or batch them to be sent to OpenGL later
* This improves performance by reducing the amount of OpenGL calls.
*/
template<typename PSO>
static void addDrawRangeElements(GLuint start,
GLuint end,
GLsizei count,
GLuint offset)
{
if (end - start + 1 > GLmaxElementsVertices)
{
debug(LOG_WARNING, "A single call provided too much vertices, will operate at reduced performance or crash. Decrease the sector size to fix this.");
}
if (count > GLmaxElementsIndices)
{
debug(LOG_WARNING, "A single call provided too much indices, will operate at reduced performance or crash. Decrease the sector size to fix this.");
}
if (!drawRangeElementsStarted)
{
dreStart = start;
dreEnd = end;
dreCount = count;
dreOffset = offset;
drawRangeElementsStarted = true;
return;
}
// check if we can append theoretically and
// check if this will not go over the bounds advised by the opengl implementation
if (dreOffset + dreCount != offset ||
dreCount + count > GLmaxElementsIndices ||
end - dreStart + 1 > GLmaxElementsVertices)
{
finishDrawRangeElements<PSO>();
// start anew
addDrawRangeElements<PSO>(start, end, count, offset);
}
else
{
// OK to append
dreCount += count;
dreEnd = end;
}
// make sure we did everything right
ASSERT(dreEnd - dreStart + 1 <= GLmaxElementsVertices, "too many vertices (%i)", (int)(dreEnd - dreStart + 1));
ASSERT(dreCount <= GLmaxElementsIndices, "too many indices (%i)", (int)(dreCount));
}
/// Get the colour of the terrain tile at the specified position
PIELIGHT getTileColour(int x, int y)
{
return mapTile(x, y)->colour;
}
/// Set the colour of the tile at the specified position
void setTileColour(int x, int y, PIELIGHT colour)
{
MAPTILE *psTile = mapTile(x, y);
psTile->colour = colour;
}
static void flipRotateTexCoords(unsigned short texture, Vector2f &sP1, Vector2f &sP2, Vector2f &sP3, Vector2f &sP4);
// NOTE: The current (max) texture size of a tile is 128x128. We allow up to a user defined texture size
// of 2048. This will cause ugly seams for the decals, if user picks a texture size bigger than the tile!
/// Set up the texture coordinates for a tile
static Vector2f getTileTexCoords(Vector2f *uv, unsigned int tileNumber)
{
/* unmask proper values from compressed data */
const unsigned short texture = TileNumber_texture(tileNumber);
const unsigned short tile = TileNumber_tile(tileNumber);
/* Used to calculate texture coordinates */
const float xMult = 1.0f / TILES_IN_PAGE_COLUMN;
const float yMult = 1.0f / TILES_IN_PAGE_ROW;
float texsize = (float)getTextureSize();
// the decals are 128x128 (at this time), we should not go above this value. See note above
if (texsize > getCurrentTileTextureSize())
{
texsize = getCurrentTileTextureSize();
}
const float centertile = 0.5f / texsize; // compute center of tile
const float shiftamount = (texsize - 1.0f) / texsize; // 1 pixel border
// bump the texture coords, for 1 pixel border, so our range is [.5,(texsize - .5)]
const float one = 1.0f / (TILES_IN_PAGE_COLUMN * texsize) + centertile * shiftamount;
/*
* Points for flipping the texture around if the tile is flipped or rotated
* Store the source rect as four points
*/
Vector2f sP1 { one, one };
Vector2f sP2 { xMult - one, one };
Vector2f sP3 { xMult - one, yMult - one };
Vector2f sP4 { one, yMult - one };
flipRotateTexCoords(texture, sP1, sP2, sP3, sP4);
const Vector2f offset { tileTexInfo[tile].uOffset, tileTexInfo[tile].vOffset };
uv[0 + 0] = offset + sP1;
uv[0 + 2] = offset + sP2;
uv[1 + 2] = offset + sP3;
uv[1 + 0] = offset + sP4;
/// Calculate the average texture coordinates of 4 points
return Vector2f { (uv[0].x + uv[1].x + uv[2].x + uv[3].x) / 4, (uv[0].y + uv[1].y + uv[2].y + uv[3].y) / 4 };
}
static void flipRotateTexCoords(unsigned short texture, Vector2f &sP1, Vector2f &sP2, Vector2f &sP3, Vector2f &sP4)
{
if (texture & TILE_XFLIP)
{
std::swap(sP1, sP2);
std::swap(sP3, sP4);
}
if (texture & TILE_YFLIP)
{
std::swap(sP1, sP4);
std::swap(sP2, sP3);
}
Vector2f sPTemp;
switch ((texture & TILE_ROTMASK) >> TILE_ROTSHIFT)
{
case 1:
sPTemp = sP1;
sP1 = sP4;
sP4 = sP3;
sP3 = sP2;
sP2 = sPTemp;
break;
case 2:
sPTemp = sP1;
sP1 = sP3;
sP3 = sPTemp;
sPTemp = sP4;
sP4 = sP2;
sP2 = sPTemp;
break;
case 3:
sPTemp = sP1;
sP1 = sP2;
sP2 = sP3;
sP3 = sP4;
sP4 = sPTemp;
break;
}
}
/// set up tile/decal coords for texture arrays. just flip/rotate, without borders and tex atlas stuff.
static Vector2f getTileTexArrCoords(Vector2f *uv, unsigned int tileNumber)
{
/* unmask proper values from compressed data */
const unsigned short texture = TileNumber_texture(tileNumber);
Vector2f sP[] = {{ 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 }};
flipRotateTexCoords(texture, sP[0], sP[1], sP[2], sP[3]);
uv[0 + 0] = sP[0];
uv[0 + 2] = sP[1];
uv[1 + 2] = sP[2];
uv[1 + 0] = sP[3];
return Vector2f { 0.5, 0.5 };
}
/// Average the four positions to get the center
static void averagePos(Vector3i *center, Vector3i *a, Vector3i *b, Vector3i *c, Vector3i *d)
{
center->x = (a->x + b->x + c->x + d->x) / 4;
center->y = (a->y + b->y + c->y + d->y) / 4;
center->z = (a->z + b->z + c->z + d->z) / 4;
}
/// Is this position next to a water tile?
static bool isWater(int x, int y)
{
bool result = false;
result = result || (tileOnMap(x , y) && terrainType(mapTile(x , y)) == TER_WATER);
result = result || (tileOnMap(x - 1, y) && terrainType(mapTile(x - 1, y)) == TER_WATER);
result = result || (tileOnMap(x , y - 1) && terrainType(mapTile(x , y - 1)) == TER_WATER);
result = result || (tileOnMap(x - 1, y - 1) && terrainType(mapTile(x - 1, y - 1)) == TER_WATER);
return result;
}
/// Is this position an *actual* water-only tile?
static bool isOnlyWater(int x, int y)
{
bool result = true;
result = result && (tileOnMap(x , y) && terrainType(mapTile(x , y)) == TER_WATER);
result = result && (tileOnMap(x - 1, y) && terrainType(mapTile(x - 1, y)) == TER_WATER);
result = result && (tileOnMap(x , y - 1) && terrainType(mapTile(x , y - 1)) == TER_WATER);
result = result && (tileOnMap(x - 1, y - 1) && terrainType(mapTile(x - 1, y - 1)) == TER_WATER);
return result;
}
/// Get the position of a grid point
static void getGridPos(Vector3i *result, int x, int y, bool center, bool water)
{
if (center)
{
Vector3i a, b, c, d;
getGridPos(&a, x , y , false, water);
getGridPos(&b, x + 1, y , false, water);
getGridPos(&c, x , y + 1, false, water);
getGridPos(&d, x + 1, y + 1, false, water);
averagePos(result, &a, &b, &c, &d);
return;
}
result->x = world_coord(x);
result->z = world_coord(-y);
if (x <= 0 || y <= 0 || x >= mapWidth || y >= mapHeight)
{
result->y = 0;
}
else
{
if (terrainShaderQuality != TerrainShaderQuality::CLASSIC)
{
result->y = map_TileHeight(x, y);
if (water)
{
result->y = map_WaterHeight(x, y);
}
}
else
{
result->y = map_TileHeightSurface(x, y);
}
}
}
static Vector3f getGridPosf(int x, int y, bool center = false, bool water = false)
{
Vector3i r;
getGridPos(&r, x, y, center, water);
return Vector3f(r);
}
/// Get normal vector of grid point
static Vector3f getGridNormal(int x, int y, bool center = false)
{
auto calcNormal = [](const Vector3f &pc, const std::vector<Vector3f> &p) {
auto res = Vector3f(0.0);
for (int i = 0; i < p.size(); i++) {
auto e1 = p[(i+1)%p.size()] - pc, e2 = p[i] - pc;
float ang = acos(glm::dot(e1, e2) / glm::length(e1) / glm::length(e2));
res += glm::cross(e1, e2) * ang; // += normal * (2*area) * angle
}
return -glm::normalize(res);
};
if (center) {
// avg nearest normals provide better results
return (getGridNormal(x, y) + getGridNormal(x+1, y) + getGridNormal(x+1, y+1) + getGridNormal(x, y+1)) / 4.f;
} else {
return calcNormal(getGridPosf(x, y), {
getGridPosf(x+1, y), getGridPosf(x, y, true), getGridPosf(x, y+1), getGridPosf(x-1, y, true),
getGridPosf(x-1, y), getGridPosf(x-1, y-1, true), getGridPosf(x, y-1), getGridPosf(x, y-1, true)
});
}
}
/// Calculate the average colour of 4 points
static inline void averageColour(PIELIGHT *average, PIELIGHT a, PIELIGHT b,
PIELIGHT c, PIELIGHT d)
{
average->byte.a = (a.byte.a + b.byte.a + c.byte.a + d.byte.a) / 4;
average->byte.r = (a.byte.r + b.byte.r + c.byte.r + d.byte.r) / 4;
average->byte.g = (a.byte.g + b.byte.g + c.byte.g + d.byte.g) / 4;
average->byte.b = (a.byte.b + b.byte.b + c.byte.b + d.byte.b) / 4;
}
/**
* Set the terrain and water geometry for the specified sector
*/
static void setSectorGeometry(int sx, int sy,
TerrainVertex *geometry, WaterVertex *water,
int *geometrySize, int *waterSize)
{
for (int x = sx*sectorSize; x < (sx+1)*sectorSize + 1; x++)
{
for (int y = sy * sectorSize; y < (sy+1) * sectorSize + 1; y++)
{
// set up geometry
auto pos = getGridPosf(x, y, false, false);
geometry[*geometrySize].pos = pos;
(*geometrySize)++;
float waterHeight = map_WaterHeight(x, y);
water[*waterSize] = glm::vec4(pos.x, (terrainShaderQuality != TerrainShaderQuality::CLASSIC) ? waterHeight : pos.y, pos.z, waterHeight - pos.y);
(*waterSize)++;
pos = getGridPosf(x, y, true, false);
geometry[*geometrySize].pos = pos;
(*geometrySize)++;
water[*waterSize] = glm::vec4(pos.x, (terrainShaderQuality != TerrainShaderQuality::CLASSIC) ? waterHeight : pos.y, pos.z, waterHeight - pos.y);
(*waterSize)++;
}
}
}
/**
* Set the decals for a sector. This takes care of both the geometry and the texture part.
*/
static void setSectorDecals(int x, int y, DecalVertex *decaldata, int *decalSize)
{
Vector3i pos;
Vector2f uv[2][2], center;
int a, b;
int i, j;
for (i = x * sectorSize; i < x * sectorSize + sectorSize; i++)
{
for (j = y * sectorSize; j < y * sectorSize + sectorSize; j++)
{
if (i < 0 || j < 0 || i >= mapWidth || j >= mapHeight)
{
continue;
}
if (TILE_HAS_DECAL(mapTile(i, j)))
{
center = getTileTexCoords(*uv, mapTile(i, j)->texture);
getGridPos(&pos, i, j, true, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = center;
(*decalSize)++;
a = 0; b = 1;
getGridPos(&pos, i + a, j + b, false, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = uv[a][b];
(*decalSize)++;
a = 0; b = 0;
getGridPos(&pos, i + a, j + b, false, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = uv[a][b];
(*decalSize)++;
getGridPos(&pos, i, j, true, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = center;
(*decalSize)++;
a = 1; b = 1;
getGridPos(&pos, i + a, j + b, false, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = uv[a][b];
(*decalSize)++;
a = 0; b = 1;
getGridPos(&pos, i + a, j + b, false, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = uv[a][b];
(*decalSize)++;
getGridPos(&pos, i, j, true, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = center;
(*decalSize)++;
a = 1; b = 0;
getGridPos(&pos, i + a, j + b, false, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = uv[a][b];
(*decalSize)++;
a = 1; b = 1;
getGridPos(&pos, i + a, j + b, false, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = uv[a][b];
(*decalSize)++;
getGridPos(&pos, i, j, true, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = center;
(*decalSize)++;
a = 0; b = 0;
getGridPos(&pos, i + a, j + b, false, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = uv[a][b];
(*decalSize)++;
a = 1; b = 0;
getGridPos(&pos, i + a, j + b, false, false);
decaldata[*decalSize].pos = pos;
decaldata[*decalSize].uv = uv[a][b];
(*decalSize)++;
}
}
}
}
static void setSectorDecalVertex_SinglePass(int x, int y, gfx_api::TerrainDecalVertex *terrainDecalData, int *terrainDecalSize)
{
Vector3i pos;
Vector2f uv[2][2], center;
int i, j;
for (i = x * sectorSize; i < x * sectorSize + sectorSize; i++)
{
for (j = y * sectorSize; j < y * sectorSize + sectorSize; j++)
{
if (i < 0 || j < 0 || i >= mapWidth || j >= mapHeight)
{
continue;
}
MAPTILE *tile = mapTile(i, j);
center = getTileTexArrCoords(*uv, tile->texture);
int decalNo = static_cast<int>(TileNumber_tile(tile->texture));
bool skipDecalDraw = !TILE_HAS_DECAL(tile);
if (terrainShaderQuality == TerrainShaderQuality::CLASSIC)
{
// in Classic mode, skip drawing any that are the "water only" decal (water is handled separately as a prior pass)
skipDecalDraw = skipDecalDraw || (isOnlyWater(i, j) && decalNo == 17); // Magic number hack, but decal # 17 is always the *water only* tile in the legacy terrain tilesets we ship // TODO: Figure out a better way of determining this from the tileset data?
}
if (skipDecalDraw)
{
decalNo = -1;
}
int dxdy[4][2] = {{0,0}, {0,1}, {1,1}, {1,0}};
PIELIGHT grounds;
gfx_api::TerrainDecalVertex vs[5];
for (int k = 0; k<4; k++) {
int dx = dxdy[k][0], dy = dxdy[k][1];
getGridPos(&pos, i + dx, j + dy, false, false);
vs[k].pos = pos;
vs[k].decalUv = uv[dx][dy];
vs[k].normal = getGridNormal(i + dx, j + dy);
vs[k].decalNo = decalNo;
grounds.vector[k] = mapTile(i + dx, j + dy)->ground;
vs[k].groundWeights.rgba = 0;
vs[k].groundWeights.vector[k] = 255;
}
// 4 = center;
getGridPos(&pos, i, j, true, false);
vs[4].pos = pos;
vs[4].decalUv = center;
vs[4].normal = getGridNormal(i, j, true);
vs[4].decalNo = decalNo;
vs[4].groundWeights = {0, 0, 0, 0}; // special value for shader.
for (int k = 0; k < 5; k++) vs[k].grounds = grounds.rgba;
terrainDecalData[(*terrainDecalSize)++] = vs[4];
terrainDecalData[(*terrainDecalSize)++] = vs[1];
terrainDecalData[(*terrainDecalSize)++] = vs[0];
terrainDecalData[(*terrainDecalSize)++] = vs[4];
terrainDecalData[(*terrainDecalSize)++] = vs[2];
terrainDecalData[(*terrainDecalSize)++] = vs[1];
terrainDecalData[(*terrainDecalSize)++] = vs[4];
terrainDecalData[(*terrainDecalSize)++] = vs[3];
terrainDecalData[(*terrainDecalSize)++] = vs[2];
terrainDecalData[(*terrainDecalSize)++] = vs[4];
terrainDecalData[(*terrainDecalSize)++] = vs[0];
terrainDecalData[(*terrainDecalSize)++] = vs[3];
// calc tangents
for (int idx = *terrainDecalSize - 3*4; idx < *terrainDecalSize; idx+=3) {
auto p = terrainDecalData + idx;
auto e1 = p[1].pos - p[0].pos;
auto e2 = p[2].pos - p[0].pos;
auto uv1 = p[1].decalUv - p[0].decalUv;
auto uv2 = p[2].decalUv - p[0].decalUv;
float r = 1.0f / (uv1.x * uv2.y - uv2.x * uv1.y);
Vector3f tangent = glm::normalize(r * (uv2.y * e1 - uv1.y * e2));
Vector3f bitangent = glm::normalize(r * (-uv2.x * e1 + uv1.x * e2));
for (int k=0; k<3; k++) {
auto &n = p[k].normal;
const auto t = glm::normalize(tangent - (n * glm::dot(tangent, n)));
float w = 1.0f; // not mirrored
if (glm::dot(glm::cross(n, t), bitangent) < 0.0f) {
w = -1.0f; // we're mirrored
}
p[k].decalTangent = glm::vec4(t, w);
}
}
}
}
}
/**
* Update the sector for when the terrain is changed.
*/
static void updateSectorGeometry(int x, int y)
{
TerrainVertex *geometry;
WaterVertex *water;
DecalVertex *decaldata;
int geometrySize = 0;
int waterSize = 0;
int decalSize = 0;
geometry = new TerrainVertex[sectors[x * ySectors + y].geometrySize];
water = (WaterVertex *)malloc(sizeof(WaterVertex) * sectors[x * ySectors + y].waterSize);
setSectorGeometry(x, y, geometry, water, &geometrySize, &waterSize);
ASSERT(geometrySize == sectors[x * ySectors + y].geometrySize, "something went seriously wrong updating the terrain");
ASSERT(waterSize == sectors[x * ySectors + y].waterSize , "something went seriously wrong updating the terrain");
geometryVBO->update(sizeof(TerrainVertex)*sectors[x * ySectors + y].geometryOffset,
sizeof(TerrainVertex)*sectors[x * ySectors + y].geometrySize, geometry,
gfx_api::buffer::update_flag::non_overlapping_updates_promise);
waterVBO->update(sizeof(WaterVertex)*sectors[x * ySectors + y].waterOffset,
sizeof(WaterVertex)*sectors[x * ySectors + y].waterSize, water,
gfx_api::buffer::update_flag::non_overlapping_updates_promise);
delete[] geometry;
free(water);
if (terrainShaderType == TerrainShaderType::FALLBACK)
{
if (sectors[x * ySectors + y].decalSize <= 0)
{
// Nothing to do here, and glBufferSubData(GL_ARRAY_BUFFER, 0, 0, *) crashes in my graphics driver. Probably shouldn't crash...
return;
}
decaldata = (DecalVertex *)malloc(sizeof(DecalVertex) * sectors[x * ySectors + y].decalSize);
setSectorDecals(x, y, decaldata, &decalSize);
ASSERT(decalSize == sectors[x * ySectors + y].decalSize , "the amount of decals has changed");
if (decalSize > 0)
{
if (decalVBO)
{
decalVBO->update(sizeof(DecalVertex)*sectors[x * ySectors + y].decalOffset,
sizeof(DecalVertex)*sectors[x * ySectors + y].decalSize, decaldata,
gfx_api::buffer::update_flag::non_overlapping_updates_promise);
}
else
{
// didn't have decals, but now we do??
// code needs a refactoring if this is the case
ASSERT(false, "Didn't have decals, but now we do. Unsupported.");
}
}
free(decaldata);
}
else
{
gfx_api::TerrainDecalVertex *terrainDecalData = (gfx_api::TerrainDecalVertex *)malloc(sizeof(gfx_api::TerrainDecalVertex) * mapWidth * mapHeight * 12);
int terrainDecalSize = 0;
setSectorDecalVertex_SinglePass(x, y, terrainDecalData, &terrainDecalSize);
terrainDecalVBO->update(sizeof(gfx_api::TerrainDecalVertex)*sectors[x * ySectors + y].terrainAndDecalOffset,
sizeof(gfx_api::TerrainDecalVertex)*sectors[x * ySectors + y].terrainAndDecalSize, terrainDecalData,
gfx_api::buffer::update_flag::non_overlapping_updates_promise);
free(terrainDecalData);
}
}
/**
* Mark all tiles that are influenced by this grid point as dirty.
* Dirty sectors will later get updated by updateSectorGeometry.
*/
void markTileDirty(int i, int j)
{
int x, y;
if (!terrainInitialised)
{
return; // will be updated anyway
}
x = i / sectorSize;
y = j / sectorSize;
if (x < xSectors && y < ySectors) // could be on the lower or left edge of the map
{
sectors[x * ySectors + y].dirty = true;
}
// it could be on an edge, so update for all sectors it is in
if (x * sectorSize == i && x > 0)
{
if (x - 1 < xSectors && y < ySectors)
{
sectors[(x - 1)*ySectors + y].dirty = true;
}
}
if (y * sectorSize == j && y > 0)
{
if (x < xSectors && y - 1 < ySectors)
{
sectors[x * ySectors + (y - 1)].dirty = true;
}
}
if (x * sectorSize == i && x > 0 && y * sectorSize == j && y > 0)
{
if (x - 1 < xSectors && y - 1 < ySectors)
{
sectors[(x - 1)*ySectors + (y - 1)].dirty = true;
}
}
}
void loadWaterTextures(int maxTerrainTextureSize);
void loadTerrainTextures_Fallback(MAP_TILESET mapTileset)
{
ASSERT_OR_RETURN(, getNumGroundTypes(), "Ground type was not set, no textures will be seen.");
int32_t maxGfxTextureSize = gfx_api::context::get().get_context_value(gfx_api::context::context_value::MAX_TEXTURE_SIZE);
int maxTerrainTextureSize = std::max(std::min({getTextureSize(), maxGfxTextureSize}), MIN_TERRAIN_TEXTURE_SIZE);
// for each terrain layer
for (int layer = 0; layer < getNumGroundTypes(); layer++)
{
// pre-load the texture
const auto groundType = getGroundType(layer);
optional<size_t> texPage = iV_GetTexture(groundType.textureName.c_str(), gfx_api::texture_type::game_texture, maxTerrainTextureSize, maxTerrainTextureSize);
ASSERT(texPage.has_value(), "Failed to pre-load terrain texture: %s", groundType.textureName.c_str());
}
// load water textures
loadWaterTextures(maxTerrainTextureSize);
}
static gfx_api::texture_array* groundTexArr = nullptr;
static gfx_api::texture_array* groundNormalArr = nullptr;
static gfx_api::texture_array* groundSpecularArr = nullptr;
static gfx_api::texture_array* groundHeightArr = nullptr;
struct WaterTextures
{
gfx_api::texture* tex1 = nullptr;
gfx_api::texture* tex2 = nullptr;
// water optional textures. null if none
gfx_api::texture* tex1_nm = nullptr;
gfx_api::texture* tex2_nm = nullptr;
gfx_api::texture* tex1_sm = nullptr;
gfx_api::texture* tex2_sm = nullptr;
public:
void clear()
{
delete tex1; tex1 = nullptr;
delete tex2; tex2 = nullptr;
delete tex1_nm; tex1_nm = nullptr;
delete tex2_nm; tex2_nm = nullptr;
delete tex1_sm; tex1_sm = nullptr;
delete tex2_sm; tex2_sm = nullptr;
}
};
static WaterTextures waterTextures;
static gfx_api::texture* waterClassicTexture = nullptr; // only used for classic mode
gfx_api::texture* getWaterClassicTexture()
{
if (waterClassicTexture)
{
return waterClassicTexture;
}
int32_t maxGfxTextureSize = gfx_api::context::get().get_context_value(gfx_api::context::context_value::MAX_TEXTURE_SIZE);
int maxTerrainTextureSize = std::max(std::min({getTextureSize(), maxGfxTextureSize}), MIN_TERRAIN_TEXTURE_SIZE);
std::string legacyWaterDecalPath = std::string(tilesetDir) + "-" + std::to_string(getCurrentTileTextureSize()) + "/tile-17.png"; // TODO: This is currently hard-coded for legacy tileset textures...
waterClassicTexture = gfx_api::context::get().loadTextureFromFile(legacyWaterDecalPath.c_str(), gfx_api::texture_type::game_texture, maxTerrainTextureSize, maxTerrainTextureSize);
return waterClassicTexture;
}
void loadWaterTextures(int maxTerrainTextureSize)
{
waterTextures.clear();
// load water textures
auto checkTex = [maxTerrainTextureSize](const WzString &fileName, gfx_api::texture_type type) -> gfx_api::texture* {
WzString fullName = "texpages/" + fileName;
auto imageLoadFilename = gfx_api::imageLoadFilenameFromInputFilename(fullName);
if (!PHYSFS_exists(imageLoadFilename))
{
return nullptr;
}
return gfx_api::context::get().loadTextureFromFile(imageLoadFilename.toUtf8().c_str(), type, maxTerrainTextureSize, maxTerrainTextureSize);
};
waterTextures.tex1 = checkTex("page-80-water-1.png", gfx_api::texture_type::game_texture);
waterTextures.tex2 = checkTex("page-81-water-2.png", (terrainShaderQuality != TerrainShaderQuality::NORMAL_MAPPING) ? gfx_api::texture_type::specular_map : gfx_api::texture_type::game_texture);
// check water optional textures
waterTextures.tex1_nm = checkTex("page-80-water-1_nm.png", gfx_api::texture_type::normal_map);
waterTextures.tex2_nm = checkTex("page-81-water-2_nm.png", gfx_api::texture_type::normal_map);
waterTextures.tex1_sm = checkTex("page-80-water-1_sm.png", gfx_api::texture_type::specular_map);
waterTextures.tex2_sm = checkTex("page-81-water-2_sm.png", gfx_api::texture_type::specular_map);
}
void loadTerrainTextures_SinglePass(MAP_TILESET mapTileset)
{
ASSERT_OR_RETURN(, getNumGroundTypes(), "Ground type was not set, no textures will be seen.");
int32_t maxGfxTextureSize = gfx_api::context::get().get_context_value(gfx_api::context::context_value::MAX_TEXTURE_SIZE);
int maxTerrainTextureSize = std::max(std::min({getTextureSize(), maxGfxTextureSize}), MIN_TERRAIN_TEXTURE_SIZE);
delete groundTexArr; groundTexArr = nullptr;
delete groundNormalArr; groundNormalArr = nullptr;
delete groundSpecularArr; groundSpecularArr = nullptr;
delete groundHeightArr; groundHeightArr = nullptr;
delete waterClassicTexture; waterClassicTexture = nullptr;
std::vector<WzString> groundTextureFilenames;
std::vector<WzString> groundTextureFilenames_nm;
std::vector<WzString> groundTextureFilenames_spec;
std::vector<WzString> groundTextureFilenames_height;
auto optTexturenameToPath = [](const std::string& textureFilename) -> WzString {
if (textureFilename.empty())
{
return WzString();
}
return "texpages/" + WzString::fromUtf8(textureFilename);
};
// for each terrain layer
for (int layer = 0; layer < getNumGroundTypes(); layer++)
{
const auto groundType = getGroundType(layer);
groundTextureFilenames.push_back(optTexturenameToPath(groundType.textureName));
groundTextureFilenames_nm.push_back(optTexturenameToPath(groundType.normalMapTextureName));
groundTextureFilenames_spec.push_back(optTexturenameToPath(groundType.specularMapTextureName));
groundTextureFilenames_height.push_back(optTexturenameToPath(groundType.heightMapTextureName));
}
// load the textures into the texture arrays
groundTexArr = gfx_api::context::get().loadTextureArrayFromFiles(groundTextureFilenames, gfx_api::texture_type::game_texture, maxTerrainTextureSize, maxTerrainTextureSize, nullptr, []() { resDoResLoadCallback(); });
ASSERT(groundTexArr != nullptr, "Failed to load terrain textures");
if (terrainShaderQuality == TerrainShaderQuality::NORMAL_MAPPING)
{
if (std::any_of(groundTextureFilenames_nm.begin(), groundTextureFilenames_nm.end(), [](const WzString& filename) {
return !filename.isEmpty();
}))
{
groundNormalArr = gfx_api::context::get().loadTextureArrayFromFiles(groundTextureFilenames_nm, gfx_api::texture_type::normal_map, maxTerrainTextureSize, maxTerrainTextureSize, [](int width, int height, int channels) -> std::unique_ptr<iV_Image> {
std::unique_ptr<iV_Image> pDefaultNormalMap = std::unique_ptr<iV_Image>(new iV_Image);
pDefaultNormalMap->allocate(width, height, channels, true);
// default normal map: (0,0,1)
unsigned char* pBmpWrite = pDefaultNormalMap->bmp_w();
memset(pBmpWrite, 0x7f, pDefaultNormalMap->data_size());
if (channels >= 3)
{
size_t pixelIncrement = static_cast<size_t>(channels);
for (size_t b = 0; b < pDefaultNormalMap->data_size(); b += pixelIncrement)
{
pBmpWrite[b+2] = 0xff; // blue=z
}
}
return pDefaultNormalMap;
}, []() { resDoResLoadCallback(); });
ASSERT(groundNormalArr != nullptr, "Failed to load terrain normals");
}
if (std::any_of(groundTextureFilenames_spec.begin(), groundTextureFilenames_spec.end(), [](const WzString& filename) {
return !filename.isEmpty();
}))
{
groundSpecularArr = gfx_api::context::get().loadTextureArrayFromFiles(groundTextureFilenames_spec, gfx_api::texture_type::specular_map, maxTerrainTextureSize, maxTerrainTextureSize, [](int width, int height, int channels) -> std::unique_ptr<iV_Image> {
std::unique_ptr<iV_Image> pDefaultSpecularMap = std::unique_ptr<iV_Image>(new iV_Image);
// default specular map: 0
pDefaultSpecularMap->allocate(width, height, channels, true);
return pDefaultSpecularMap;
}, []() { resDoResLoadCallback(); });
ASSERT(groundSpecularArr != nullptr, "Failed to load terrain specular maps");
}
if (std::any_of(groundTextureFilenames_height.begin(), groundTextureFilenames_height.end(), [](const WzString& filename) {
return !filename.isEmpty();
}))
{
groundHeightArr = gfx_api::context::get().loadTextureArrayFromFiles(groundTextureFilenames_height, gfx_api::texture_type::height_map, maxTerrainTextureSize, maxTerrainTextureSize, [](int width, int height, int channels) -> std::unique_ptr<iV_Image> {
std::unique_ptr<iV_Image> pDefaultHeightMap = std::unique_ptr<iV_Image>(new iV_Image);
// default height map: 0
pDefaultHeightMap->allocate(width, height, channels, true);
return pDefaultHeightMap;
}, []() { resDoResLoadCallback(); });
ASSERT(groundHeightArr != nullptr, "Failed to load terrain height maps");
}
}
// load water textures
loadWaterTextures(maxTerrainTextureSize);
}
void loadTerrainTextures(MAP_TILESET mapTileset)
{
ASSERT_OR_RETURN(, getNumGroundTypes(), "Ground type was not set, no textures will be seen.");
switch (terrainShaderType)
{
case TerrainShaderType::FALLBACK:
loadTerrainTextures_Fallback(mapTileset);
break;
case TerrainShaderType::SINGLE_PASS:
loadTerrainTextures_SinglePass(mapTileset);
break;
}
}
void reloadTerrainTextures()
{
if (getNumGroundTypes() == 0)
{
return; // nothing loaded yet
}
loadTerrainTextures(currentMapTileset);
}
/**
* Check what the videocard + drivers support and divide the loaded map into sectors that can be drawn.
* It also determines the lightmap size.
*/
bool initTerrain()
{
int i, j, x, y, a, b, absX, absY;
PIELIGHT colour[2][2], centerColour;
int layer = 0;
TerrainVertex *geometry = nullptr;
WaterVertex *water = nullptr;
DecalVertex *decaldata = nullptr;
int geometrySize, geometryIndexSize;
int waterSize, waterIndexSize;
int textureSize, textureIndexSize;
GLuint *geometryIndex = nullptr;
GLuint *waterIndex = nullptr;
GLuint *textureIndex = nullptr;
PIELIGHT *texture = nullptr;
int decalSize = 0;