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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#include "System/mmgr.h"
#include "HeightMapTexture.h"
#include "ReadMap.h"
#include "System/EventHandler.h"
#include "System/Rectangle.h"
#include "System/Config/ConfigHandler.h"
CONFIG(bool, HeightMapTexture).defaultValue(true);
HeightMapTexture* heightMapTexture = NULL;
HeightMapTexture::HeightMapTexture()
: CEventClient("[HeightMapTexture]", 2718965, false)
{
texID = 0;
xSize = 0;
ySize = 0;
eventHandler.AddClient(this);
Init();
}
HeightMapTexture::~HeightMapTexture()
{
Kill();
eventHandler.RemoveClient(this);
}
void HeightMapTexture::Init()
{
if (readmap == NULL) {
return;
}
if (!configHandler->GetBool("HeightMapTexture")) {
return;
}
if (!GLEW_ARB_texture_float ||
!GLEW_ARB_texture_non_power_of_two) {
return;
}
xSize = gs->mapxp1;
ySize = gs->mapyp1;
glGenTextures(1, &texID);
glBindTexture(GL_TEXTURE_2D, texID);
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_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
const float* heightMap = readmap->GetCornerHeightMapUnsynced();
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE32F_ARB,
xSize, ySize, 0,
GL_LUMINANCE, GL_FLOAT, heightMap);
glBindTexture(GL_TEXTURE_2D, 0);
}
void HeightMapTexture::Kill()
{
glDeleteTextures(1, &texID);
texID = 0;
xSize = 0;
ySize = 0;
}
void HeightMapTexture::UnsyncedHeightMapUpdate(const SRectangle& rect)
{
if (texID == 0) {
return;
}
const float* heightMap = readmap->GetCornerHeightMapUnsynced();
const int sizeX = rect.x2 - rect.x1 + 1;
const int sizeZ = rect.z2 - rect.z1 + 1;
pbo.Bind();
pbo.Resize(sizeX * sizeZ * sizeof(float));
{
float* buf = (float*) pbo.MapBuffer();
for (int z = 0; z < sizeZ; z++) {
const void* src = heightMap + rect.x1 + (z + rect.z1) * xSize;
void* dst = buf + z * sizeX;
memcpy(dst, src, sizeX * sizeof(float));
}
}
pbo.UnmapBuffer();
glBindTexture(GL_TEXTURE_2D, texID);
glTexSubImage2D(GL_TEXTURE_2D, 0,
rect.x1, rect.z1, sizeX, sizeZ,
GL_LUMINANCE, GL_FLOAT, pbo.GetPtr());
pbo.Unbind();
}
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