void CDecalsDrawerGL4::GenerateAtlasTexture()
{
std::unordered_map<std::string, STex> textures;
GetBuildingDecals(textures);
GetGroundScars(textures);
GetFallbacks(textures);
CQuadtreeAtlasAlloc atlas;
atlas.SetNonPowerOfTwo(globalRendering->supportNPOTs);
atlas.SetMaxSize(globalRendering->maxTextureSize, globalRendering->maxTextureSize);
for (auto it = textures.begin(); it != textures.end(); ++it) {
if (it->second.id == 0)
continue;
const float maxSize = 1024; //512;
int2 size = it->second.size;
if (size.x > maxSize) {
size.y = size.y * (maxSize / size.x);
size.x = maxSize;
}
if (size.y > maxSize) {
size.x = size.x * (maxSize / size.y);
size.y = maxSize;
}
atlas.AddEntry(it->first, size);
}
/*bool success =*/ atlas.Allocate();
glGenTextures(1, &atlasTex);
glBindTexture(GL_TEXTURE_2D, atlasTex);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 4.0f);
glSpringTexStorage2D(GL_TEXTURE_2D, atlas.GetMaxMipMaps(), GL_RGBA8, atlas.GetAtlasSize().x, atlas.GetAtlasSize().y);
FBO fb;
if (!fb.IsValid()) {
LOG_L(L_ERROR, "[%s] framebuffer not valid", __FUNCTION__);
return;
}
fb.Bind();
fb.AttachTexture(atlasTex);
if (!fb.CheckStatus(LOG_SECTION_DECALS_GL4)) {
LOG_L(L_ERROR, "[%s] Couldn't render to FBO!", __FUNCTION__);
return;
}
glViewport(0, 0, atlas.GetAtlasSize().x, atlas.GetAtlasSize().y);
glSpringMatrix2dProj(atlas.GetAtlasSize().x, atlas.GetAtlasSize().y);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // transparent black
glClear(GL_COLOR_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ZERO);
glDisable(GL_DEPTH_TEST);
CVertexArray va;
for (auto& p: textures) {
if (p.second.id == 0)
continue;
const float4 texCoords = atlas.GetTexCoords(p.first);
const float4 absCoords = atlas.GetEntry(p.first);
atlasTexs[p.first] = SAtlasTex(texCoords);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBindTexture(GL_TEXTURE_2D, p.second.id);
va.Initialize();
va.AddVertex2dT(absCoords.x, absCoords.y, 0.0f, 0.0f);
va.AddVertex2dT(absCoords.z+1, absCoords.y, 1.0f, 0.0f); //FIXME why +1?
va.AddVertex2dT(absCoords.x, absCoords.w+1, 0.0f, 1.0f);
va.AddVertex2dT(absCoords.z+1, absCoords.w+1, 1.0f, 1.0f); //FIXME why +1?
va.DrawArray2dT(GL_TRIANGLE_STRIP);
glDeleteTextures(1, &p.second.id);
}
fb.Unbind();
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glBindTexture(GL_TEXTURE_2D, atlasTex);
glGenerateMipmap(GL_TEXTURE_2D);
#ifdef DEBUG_SAVE_ATLAS
glSaveTexture(atlasTex, "x_decal_atlas.png");
#endif
}
void CGrassDrawer::CreateFarTex()
{
//TODO create normalmap, too?
const int sizeMod = 2;
const int billboardSize = 256;
const int numAngles = 16;
const int texSizeX = billboardSize * numAngles;
const int texSizeY = billboardSize;
if (farTex == 0) {
glGenTextures(1, &farTex);
glBindTexture(GL_TEXTURE_2D, farTex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glSpringTexStorage2D(GL_TEXTURE_2D, -1, GL_RGBA8, texSizeX, texSizeY);
}
FBO fboTex;
fboTex.Bind();
fboTex.AttachTexture(farTex);
fboTex.CheckStatus("GRASSDRAWER1");
FBO fbo;
fbo.Bind();
fbo.CreateRenderBuffer(GL_DEPTH_ATTACHMENT_EXT, GL_DEPTH_COMPONENT16, texSizeX * sizeMod, texSizeY * sizeMod);
fbo.CreateRenderBuffer(GL_COLOR_ATTACHMENT0_EXT, GL_RGBA8, texSizeX * sizeMod, texSizeY * sizeMod);
fbo.CheckStatus("GRASSDRAWER2");
if (!fboTex.IsValid() || !fbo.IsValid()) {
grassOff = true;
return;
}
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glDisable(GL_FOG);
glDisable(GL_BLEND);
glDisable(GL_ALPHA_TEST);
glBindTexture(GL_TEXTURE_2D, grassBladeTex);
glEnable(GL_TEXTURE_2D);
glEnable(GL_CLIP_PLANE0);
glEnable(GL_DEPTH_TEST);
glDepthMask(GL_TRUE);
glColor4f(1,1,1,1);
glViewport(0,0,texSizeX*sizeMod, texSizeY*sizeMod);
glClearColor(mapInfo->grass.color.r,mapInfo->grass.color.g,mapInfo->grass.color.b,0.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.f,0.f,0.f,0.f);
static const GLdouble eq[4] = {0.f, 1.f, 0.f, 0.f};
// render turf from different vertical angles
for (int a=0;a<numAngles;++a) {
glViewport(a*billboardSize*sizeMod, 0, billboardSize*sizeMod, billboardSize*sizeMod);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glRotatef(a*90.f/(numAngles-1),1,0,0);
//glTranslatef(0,-0.5f,0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-partTurfSize, partTurfSize, partTurfSize, -partTurfSize, -turfSize, turfSize);
// has to be applied after the matrix transformations,
// cause it uses those an `compiles` them into the clip plane
glClipPlane(GL_CLIP_PLANE0, &eq[0]);
glCallList(grassDL);
}
glDisable(GL_CLIP_PLANE0);
// scale down the rendered fartextures (MSAA) and write to the final texture
glBindFramebufferEXT(GL_READ_FRAMEBUFFER, fbo.fboId);
glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER, fboTex.fboId);
glBlitFramebufferEXT(0, 0, texSizeX*sizeMod, texSizeY*sizeMod,
0, 0, texSizeX, texSizeY,
GL_COLOR_BUFFER_BIT, GL_LINEAR);
// compute mipmaps
glBindTexture(GL_TEXTURE_2D, farTex);
glGenerateMipmap(GL_TEXTURE_2D);
// blur non-rendered areas, so in mipmaps color data isn't blurred with background color
{
const int mipLevels = std::ceil(std::log((float)(std::max(texSizeX, texSizeY) + 1)));
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glEnable(GL_BLEND);
glBlendFuncSeparate(GL_ONE_MINUS_DST_ALPHA, GL_DST_ALPHA, GL_ZERO, GL_DST_ALPHA);
// copy each mipmap to its predecessor background
// -> fill background with blurred color data
fboTex.Bind();
for (int mipLevel = mipLevels - 2; mipLevel >= 0; --mipLevel) {
fboTex.AttachTexture(farTex, GL_TEXTURE_2D, GL_COLOR_ATTACHMENT0_EXT, mipLevel);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, mipLevel + 1.f);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, mipLevel + 1.f);
glViewport(0, 0, texSizeX>>mipLevel, texSizeY>>mipLevel);
CVertexArray* va = GetVertexArray();
va->Initialize();
va->AddVertexT(float3(-1.0f, 1.0f, 0.0f), 0.0f, 1.0f);
va->AddVertexT(float3( 1.0f, 1.0f, 0.0f), 1.0f, 1.0f);
va->AddVertexT(float3( 1.0f, -1.0f, 0.0f), 1.0f, 0.0f);
va->AddVertexT(float3(-1.0f, -1.0f, 0.0f), 0.0f, 0.0f);
va->DrawArrayT(GL_QUADS);
}
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// recreate mipmaps from now blurred base level
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, -1000.f);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, 1000.f);
glGenerateMipmap(GL_TEXTURE_2D);
}
glViewport(globalRendering->viewPosX, 0, globalRendering->viewSizeX, globalRendering->viewSizeY);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
FBO::Unbind();
//glSaveTexture(farTex, "grassfar.png");
}
void CGrassDrawer::CreateFarTex()
{
int sizeMod=2;
glGenTextures(1, &farTex);
glBindTexture(GL_TEXTURE_2D, farTex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glSpringTexStorage2D(GL_TEXTURE_2D, -1, GL_RGBA8, 1024, 64);
FBO fboTex;
fboTex.Bind();
fboTex.AttachTexture(farTex);
fboTex.CheckStatus("GRASSDRAWER1");
FBO fbo;
fbo.Bind();
fbo.CreateRenderBuffer(GL_DEPTH_ATTACHMENT_EXT, GL_DEPTH_COMPONENT16, 1024 * sizeMod, 64 * sizeMod);
fbo.CreateRenderBuffer(GL_COLOR_ATTACHMENT0_EXT, GL_RGBA8, 1024 * sizeMod, 64 * sizeMod);
fbo.CheckStatus("GRASSDRAWER2");
if (!fboTex.IsValid() || !fbo.IsValid()) {
grassOff = true;
return;
}
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glDisable(GL_FOG);
glDisable(GL_BLEND);
glDisable(GL_ALPHA_TEST);
glBindTexture(GL_TEXTURE_2D, grassBladeTex);
glEnable(GL_TEXTURE_2D);
glColor4f(1,1,1,1);
glViewport(0,0,1024*sizeMod, 64*sizeMod);
glClearColor(0.75f,0.9f,0.75f,0.f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.f,0.f,0.f,0.f);
// render turf from different vertical angles
for (int a=0;a<16;++a) {
glViewport(a*64*sizeMod, 0, 64*sizeMod, 64*sizeMod);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glRotatef((a-1)*90/15.0f,1,0,0);
glTranslatef(0,-0.5f,0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-partTurfSize, partTurfSize, -partTurfSize, partTurfSize, -turfSize, turfSize);
glCallList(grassDL);
}
glViewport(globalRendering->viewPosX, 0, globalRendering->viewSizeX, globalRendering->viewSizeY);
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
// scale down the rendered fartextures (MSAA) and write to the final texture
glBindFramebufferEXT(GL_READ_FRAMEBUFFER, fbo.fboId);
glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER, fboTex.fboId);
glBlitFramebufferEXT(0, 0, 1024*sizeMod, 64*sizeMod,
0, 0, 1024, 64,
GL_COLOR_BUFFER_BIT, GL_LINEAR);
fbo.Unbind();
// compute mipmaps
glBindTexture(GL_TEXTURE_2D, farTex);
glGenerateMipmap(GL_TEXTURE_2D);
}