/* Initialise the Trig tables */
bool trigInitialise(void)
{
uint64_t test;
uint32_t crc;
uint32_t i;
// Generate tables.
STATIC_ASSERT(sizeof(trigSinTable)/sizeof(*trigSinTable) == 0x4001);
for (i = 0; i != 0x4001; ++i)
{
trigSinTable[i] = (int)(0x10000*sin(i*(M_PI/0x8000)) + 0.5) - !!i; // -!!i = subtract 1, unless i == 0.
}
STATIC_ASSERT(sizeof(trigAtanTable)/sizeof(*trigAtanTable) == 0x2001);
for (i = 0; i != 0x2001; ++i)
{
trigAtanTable[i] = (int)(0x8000/M_PI*atan((double)i/0x2000) + 0.5);
}
// Check tables are correct.
crc = ~crcSumU16(0, trigSinTable, sizeof(trigSinTable)/sizeof(*trigSinTable));
ASSERT(crc == 0x6D3C8DB5, "Bad trigSinTable CRC = 0x%08X, sin function is broken.", crc);
crc = ~crcSumU16(0, trigAtanTable, sizeof(trigAtanTable)/sizeof(*trigAtanTable));
ASSERT(crc == 0xD2797F85, "Bad trigAtanTable CRC = 0x%08X, atan function is broken.", crc);
// Test large and small square roots.
for (test = 0x0000; test != 0x10000; ++test)
{
uint64_t lower = test*test;
uint64_t upper = (test + 1)*(test + 1) - 1;
ASSERT((uint32_t)iSqrt(lower) == test, "Sanity check failed, sqrt(%"PRIu64") gave %"PRIu32" instead of %"PRIu64"!", lower, i64Sqrt(lower), test);
ASSERT((uint32_t)iSqrt(upper) == test, "Sanity check failed, sqrt(%"PRIu64") gave %"PRIu32" instead of %"PRIu64"!", upper, i64Sqrt(upper), test);
}
for (test = 0xFFFE0000; test != 0x00020000; test = (test + 1)&0xFFFFFFFF)
{
uint64_t lower = test*test;
uint64_t upper = (test + 1)*(test + 1) - 1;
ASSERT((uint32_t)i64Sqrt(lower) == test, "Sanity check failed, sqrt(%"PRIu64") gave %"PRIu32" instead of %"PRIu64"!", lower, i64Sqrt(lower), test);
ASSERT((uint32_t)i64Sqrt(upper) == test, "Sanity check failed, sqrt(%"PRIu64") gave %"PRIu32" instead of %"PRIu64"!", upper, i64Sqrt(upper), test);
}
return true;
}
/**
* 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(void)
{
int i, j, x, y, a, b, absX, absY;
PIELIGHT colour[2][2], centerColour;
int layer = 0;
RenderVertex *geometry;
RenderVertex *water;
DecalVertex *decaldata;
int geometrySize, geometryIndexSize;
int waterSize, waterIndexSize;
int textureSize, textureIndexSize;
GLuint *geometryIndex;
GLuint *waterIndex;
GLuint *textureIndex;
PIELIGHT *texture;
int decalSize;
int maxSectorSizeIndices, maxSectorSizeVertices;
bool decreasedSize = false;
// call VBO support hack before using it
screen_EnableVBO();
// this information is useful to prevent crashes with buggy opengl implementations
glGetIntegerv(GL_MAX_ELEMENTS_VERTICES, &GLmaxElementsVertices);
glGetIntegerv(GL_MAX_ELEMENTS_INDICES, &GLmaxElementsIndices);
// testing for crappy cards
debug(LOG_TERRAIN, "GL_MAX_ELEMENTS_VERTICES: %i", (int)GLmaxElementsVertices);
debug(LOG_TERRAIN, "GL_MAX_ELEMENTS_INDICES: %i", (int)GLmaxElementsIndices);
// now we know these values, determine the maximum sector size achievable
maxSectorSizeVertices = iSqrt(GLmaxElementsVertices/2)-1;
maxSectorSizeIndices = iSqrt(GLmaxElementsIndices/12);
debug(LOG_TERRAIN, "preferred sector size: %i", sectorSize);
debug(LOG_TERRAIN, "maximum sector size due to vertices: %i", maxSectorSizeVertices);
debug(LOG_TERRAIN, "maximum sector size due to indices: %i", maxSectorSizeIndices);
if (sectorSize > maxSectorSizeVertices)
{
sectorSize = maxSectorSizeVertices;
decreasedSize = true;
}
if (sectorSize > maxSectorSizeIndices)
{
sectorSize = maxSectorSizeIndices;
decreasedSize = true;
}
if (decreasedSize)
{
if (sectorSize < 1)
{
debug(LOG_WARNING, "GL_MAX_ELEMENTS_VERTICES: %i", (int)GLmaxElementsVertices);
debug(LOG_WARNING, "GL_MAX_ELEMENTS_INDICES: %i", (int)GLmaxElementsIndices);
debug(LOG_WARNING, "maximum sector size due to vertices: %i", maxSectorSizeVertices);
debug(LOG_WARNING, "maximum sector size due to indices: %i", maxSectorSizeIndices);
debug(LOG_ERROR, "Your graphics card and/or drivers do not seem to support glDrawRangeElements, needed for the terrain renderer.");
debug(LOG_ERROR, "- Do other 3D games work?");
debug(LOG_ERROR, "- Did you install the latest drivers correctly?");
debug(LOG_ERROR, "- Do you have a 3D window manager (Aero/Compiz) running?");
return false;
}
debug(LOG_WARNING, "decreasing sector size to %i to fit graphics card constraints", sectorSize);
}
// +4 = +1 for iHypot rounding, +1 for sector size rounding, +2 for edge of visibility
terrainDistance = iHypot(visibleTiles.x/2, visibleTiles.y/2)+4+sectorSize/2;
debug(LOG_TERRAIN, "visible tiles x:%i y: %i", visibleTiles.x, visibleTiles.y);
debug(LOG_TERRAIN, "terrain view distance: %i", terrainDistance);
/////////////////////
// Create the sectors
xSectors = (mapWidth +sectorSize-1)/sectorSize;
ySectors = (mapHeight+sectorSize-1)/sectorSize;
sectors = (Sector *)malloc(sizeof(Sector)*xSectors*ySectors);
////////////////////
// fill the geometry part of the sectors
geometry = (RenderVertex *)malloc(sizeof(RenderVertex)*xSectors*ySectors*(sectorSize+1)*(sectorSize+1)*2);
geometryIndex = (GLuint *)malloc(sizeof(GLuint)*xSectors*ySectors*sectorSize*sectorSize*12);
geometrySize = 0;
geometryIndexSize = 0;
water = (RenderVertex *)malloc(sizeof(RenderVertex)*xSectors*ySectors*(sectorSize+1)*(sectorSize+1)*2);
waterIndex = (GLuint *)malloc(sizeof(GLuint)*xSectors*ySectors*sectorSize*sectorSize*12);
waterSize = 0;
waterIndexSize = 0;
for (x = 0; x < xSectors; x++)
{
for (y = 0; y < ySectors; y++)
{
sectors[x*ySectors + y].dirty = false;
sectors[x*ySectors + y].geometryOffset = geometrySize;
sectors[x*ySectors + y].geometrySize = 0;
sectors[x*ySectors + y].waterOffset = waterSize;
sectors[x*ySectors + y].waterSize = 0;
setSectorGeometry(x, y, geometry, water, &geometrySize, &waterSize);
sectors[x*ySectors + y].geometrySize = geometrySize - sectors[x*ySectors + y].geometryOffset;
sectors[x*ySectors + y].waterSize = waterSize - sectors[x*ySectors + y].waterOffset;
// and do the index buffers
sectors[x*ySectors + y].geometryIndexOffset = geometryIndexSize;
sectors[x*ySectors + y].geometryIndexSize = 0;
sectors[x*ySectors + y].waterIndexOffset = waterIndexSize;
sectors[x*ySectors + y].waterIndexSize = 0;
for (i = 0; i < sectorSize; i++)
{
for (j = 0; j < sectorSize; j++)
{
if (x*sectorSize+i >= mapWidth || y*sectorSize+j >= mapHeight)
{
continue; // off map, so skip
}
/* One tile is composed of 4 triangles,
* we need _2_ vertices per tile (1)
* e.g. center and bottom left
* the other 3 vertices are from the adjacent tiles
* on their top and right.
* (1) The top row and right column of tiles need 4 vertices per tile
* because they do not have adjacent tiles on their top and right,
* that is why we add _1_ row and _1_ column to provide the geometry
* for these tiles.
* This is the source of the '*2' and '+1' in the index math below.
*/
#define q(i,j,center) ((x*ySectors+y)*(sectorSize+1)*(sectorSize+1)*2 + ((i)*(sectorSize+1)+(j))*2+(center))
// First triangle
geometryIndex[geometryIndexSize+0] = q(i ,j ,1); // Center vertex
geometryIndex[geometryIndexSize+1] = q(i ,j ,0); // Bottom left
geometryIndex[geometryIndexSize+2] = q(i+1,j ,0); // Bottom right
// Second triangle
geometryIndex[geometryIndexSize+3] = q(i ,j ,1); // Center vertex
geometryIndex[geometryIndexSize+4] = q(i ,j+1,0); // Top left
geometryIndex[geometryIndexSize+5] = q(i ,j ,0); // Bottom left
// Third triangle
geometryIndex[geometryIndexSize+6] = q(i ,j ,1); // Center vertex
geometryIndex[geometryIndexSize+7] = q(i+1,j+1,0); // Top right
geometryIndex[geometryIndexSize+8] = q(i ,j+1,0); // Top left
// Fourth triangle
geometryIndex[geometryIndexSize+9] = q(i ,j ,1); // Center vertex
geometryIndex[geometryIndexSize+10] = q(i+1,j ,0); // Bottom right
geometryIndex[geometryIndexSize+11] = q(i+1,j+1,0); // Top right
geometryIndexSize += 12;
if (isWater(i+x*sectorSize,j+y*sectorSize))
{
waterIndex[waterIndexSize+0] = q(i ,j ,1);
waterIndex[waterIndexSize+1] = q(i ,j ,0);
waterIndex[waterIndexSize+2] = q(i+1,j ,0);
waterIndex[waterIndexSize+3] = q(i ,j ,1);
waterIndex[waterIndexSize+4] = q(i ,j+1,0);
waterIndex[waterIndexSize+5] = q(i ,j ,0);
waterIndex[waterIndexSize+6] = q(i ,j ,1);
waterIndex[waterIndexSize+7] = q(i+1,j+1,0);
waterIndex[waterIndexSize+8] = q(i ,j+1,0);
waterIndex[waterIndexSize+9] = q(i ,j ,1);
waterIndex[waterIndexSize+10] = q(i+1,j ,0);
waterIndex[waterIndexSize+11] = q(i+1,j+1,0);
waterIndexSize += 12;
}
}
}
sectors[x*ySectors + y].geometryIndexSize = geometryIndexSize - sectors[x*ySectors + y].geometryIndexOffset;
sectors[x*ySectors + y].waterIndexSize = waterIndexSize - sectors[x*ySectors + y].waterIndexOffset;
}
}
glGenBuffers(1, &geometryVBO); glError();
glBindBuffer(GL_ARRAY_BUFFER, geometryVBO); glError();
glBufferData(GL_ARRAY_BUFFER, sizeof(RenderVertex)*geometrySize, geometry, GL_DYNAMIC_DRAW); glError();
free(geometry);
glGenBuffers(1, &geometryIndexVBO); glError();
glBindBuffer(GL_ARRAY_BUFFER, geometryIndexVBO); glError();
glBufferData(GL_ARRAY_BUFFER, sizeof(GLuint)*geometryIndexSize, geometryIndex, GL_STATIC_DRAW); glError();
free(geometryIndex);
glGenBuffers(1, &waterVBO); glError();
glBindBuffer(GL_ARRAY_BUFFER, waterVBO); glError();
glBufferData(GL_ARRAY_BUFFER, sizeof(RenderVertex)*waterSize, water, GL_DYNAMIC_DRAW); glError();
free(water);
glGenBuffers(1, &waterIndexVBO); glError();
glBindBuffer(GL_ARRAY_BUFFER, waterIndexVBO); glError();
glBufferData(GL_ARRAY_BUFFER, sizeof(GLuint)*waterIndexSize, waterIndex, GL_STATIC_DRAW); glError();
free(waterIndex);
glBindBuffer(GL_ARRAY_BUFFER, 0);
////////////////////
// fill the texture part of the sectors
texture = (PIELIGHT *)malloc(sizeof(PIELIGHT)*xSectors*ySectors*(sectorSize+1)*(sectorSize+1)*2*numGroundTypes);
textureIndex = (GLuint *)malloc(sizeof(GLuint)*xSectors*ySectors*sectorSize*sectorSize*12*numGroundTypes);
textureSize = 0;
textureIndexSize = 0;
for (layer = 0; layer < numGroundTypes; layer++)
{
for (x = 0; x < xSectors; x++)
{
for (y = 0; y < ySectors; y++)
{
if (layer == 0)
{
sectors[x*ySectors + y].textureOffset = (int *)malloc(sizeof(int)*numGroundTypes);
sectors[x*ySectors + y].textureSize = (int *)malloc(sizeof(int)*numGroundTypes);
sectors[x*ySectors + y].textureIndexOffset = (int *)malloc(sizeof(int)*numGroundTypes);
sectors[x*ySectors + y].textureIndexSize = (int *)malloc(sizeof(int)*numGroundTypes);
}
sectors[x*ySectors + y].textureOffset[layer] = textureSize;
sectors[x*ySectors + y].textureSize[layer] = 0;
sectors[x*ySectors + y].textureIndexOffset[layer] = textureIndexSize;
sectors[x*ySectors + y].textureIndexSize[layer] = 0;
//debug(LOG_WARNING, "offset when filling %i: %i", layer, xSectors*ySectors*(sectorSize+1)*(sectorSize+1)*2*layer);
for (i = 0; i < sectorSize+1; i++)
{
for (j = 0; j < sectorSize+1; j++)
{
bool draw = false;
bool off_map;
// set transparency
for (a=0;a<2;a++)
{
for(b=0;b<2;b++)
{
absX = x*sectorSize+i+a;
absY = y*sectorSize+j+b;
colour[a][b].rgba = 0x00FFFFFF; // transparent
// extend the terrain type for the bottom and left edges of the map
off_map = false;
if (absX == mapWidth)
{
off_map = true;
absX--;
}
if (absY == mapHeight)
{
off_map = true;
absY--;
}
if (absX < 0 || absY < 0 || absX >= mapWidth || absY >= mapHeight)
{
// not on the map, so don't draw
continue;
}
if (mapTile(absX,absY)->ground == layer)
{
colour[a][b].rgba = 0xFFFFFFFF;
if (!off_map)
{
// if this point lies on the edge is may not force this tile to be drawn
// otherwise this will give a bright line when fog is enabled
draw = true;
}
}
}
}
texture[xSectors*ySectors*(sectorSize+1)*(sectorSize+1)*2*layer+((x*ySectors+y)*(sectorSize+1)*(sectorSize+1)*2 + (i*(sectorSize+1)+j)*2)].rgba = colour[0][0].rgba;
averageColour(¢erColour, colour[0][0], colour[0][1], colour[1][0], colour[1][1]);
texture[xSectors*ySectors*(sectorSize+1)*(sectorSize+1)*2*layer+((x*ySectors+y)*(sectorSize+1)*(sectorSize+1)*2 + (i*(sectorSize+1)+j)*2+1)].rgba = centerColour.rgba;
textureSize += 2;
if ((draw) && i < sectorSize && j < sectorSize)
{
textureIndex[textureIndexSize+0] = q(i ,j ,1);
textureIndex[textureIndexSize+1] = q(i ,j ,0);
textureIndex[textureIndexSize+2] = q(i+1,j ,0);
textureIndex[textureIndexSize+3] = q(i ,j ,1);
textureIndex[textureIndexSize+4] = q(i ,j+1,0);
textureIndex[textureIndexSize+5] = q(i ,j ,0);
textureIndex[textureIndexSize+6] = q(i ,j ,1);
textureIndex[textureIndexSize+7] = q(i+1,j+1,0);
textureIndex[textureIndexSize+8] = q(i ,j+1,0);
textureIndex[textureIndexSize+9] = q(i ,j ,1);
textureIndex[textureIndexSize+10] = q(i+1,j ,0);
textureIndex[textureIndexSize+11] = q(i+1,j+1,0);
textureIndexSize += 12;
}
}
}
sectors[x*ySectors + y].textureSize[layer] = textureSize - sectors[x*ySectors + y].textureOffset[layer];
sectors[x*ySectors + y].textureIndexSize[layer] = textureIndexSize - sectors[x*ySectors + y].textureIndexOffset[layer];
}
}
}
glGenBuffers(1, &textureVBO); glError();
glBindBuffer(GL_ARRAY_BUFFER, textureVBO); glError();
glBufferData(GL_ARRAY_BUFFER, sizeof(PIELIGHT)*xSectors*ySectors*(sectorSize+1)*(sectorSize+1)*2*numGroundTypes, texture, GL_STATIC_DRAW); glError();
free(texture);
glGenBuffers(1, &textureIndexVBO); glError();
glBindBuffer(GL_ARRAY_BUFFER, textureIndexVBO); glError();
glBufferData(GL_ARRAY_BUFFER, sizeof(GLuint)*textureIndexSize, textureIndex, GL_STATIC_DRAW); glError();
free(textureIndex);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// and finally the decals
decaldata = (DecalVertex *)malloc(sizeof(DecalVertex)*mapWidth*mapHeight*12);
decalSize = 0;
for (x = 0; x < xSectors; x++)
{
for (y = 0; y < ySectors; y++)
{
sectors[x*ySectors + y].decalOffset = decalSize;
sectors[x*ySectors + y].decalSize = 0;
setSectorDecals(x, y, decaldata, &decalSize);
sectors[x*ySectors + y].decalSize = decalSize - sectors[x*ySectors + y].decalOffset;
}
}
debug(LOG_TERRAIN, "%i decals found", decalSize/12);
glGenBuffers(1, &decalVBO); glError();
glBindBuffer(GL_ARRAY_BUFFER, decalVBO); glError();
glBufferData(GL_ARRAY_BUFFER, sizeof(DecalVertex)*decalSize, decaldata, GL_STATIC_DRAW); glError();
free(decaldata);
glBindBuffer(GL_ARRAY_BUFFER, 0);
lightmap_tex_num = 0;
lightmapLastUpdate = 0;
lightmapWidth = 1;
lightmapHeight = 1;
// determine the smallest power-of-two size we can use for the lightmap
while (mapWidth > (lightmapWidth <<= 1)) {}
while (mapHeight > (lightmapHeight <<= 1)) {}
debug(LOG_TERRAIN, "the size of the map is %ix%i", mapWidth, mapHeight);
debug(LOG_TERRAIN, "lightmap texture size is %ix%i", lightmapWidth, lightmapHeight);
// Prepare the lightmap pixmap and texture
lightmapPixmap = (GLubyte *)calloc(lightmapWidth * lightmapHeight, 3 * sizeof(GLubyte));
if (lightmapPixmap == NULL)
{
debug(LOG_FATAL, "Out of memory!");
abort();
return false;
}
glGenTextures(1, &lightmap_tex_num);
glBindTexture(GL_TEXTURE_2D, lightmap_tex_num);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, lightmapWidth, lightmapHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, lightmapPixmap);
terrainInitalised = true;
glBindBuffer(GL_ARRAY_BUFFER, 0); // HACK Must unbind GL_ARRAY_BUFFER (in this function, at least), otherwise text rendering may mysteriously crash.
return true;
}
