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#include "StdAfx.h"
// HeightMapTexture.cpp: implementation of the HeightMapTexture class.
//
//////////////////////////////////////////////////////////////////////
#include "mmgr.h"
#include "HeightMapTexture.h"
#include "ReadMap.h"
#include "ConfigHandler.h"
/******************************************************************************/
/******************************************************************************/
HeightMapTexture heightMapTexture;
HeightMapTexture::HeightMapTexture()
{
init = false;
texID = 0;
xSize = 0;
ySize = 0;
}
HeightMapTexture::~HeightMapTexture()
{
}
void HeightMapTexture::Init()
{
if (init || (readmap == NULL)) {
return;
}
init = true;
if (!configHandler->Get("HeightMapTexture", 1)) {
return;
}
if (!GLEW_ARB_texture_float ||
!GLEW_ARB_texture_non_power_of_two) {
return;
}
xSize = (gs->mapx + 1);
ySize = (gs->mapy + 1);
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->GetHeightmap();
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::UpdateArea(int x0, int z0, int x1, int z1)
{
if (texID == 0) {
return;
}
const float* heightMap = readmap->GetHeightmap();
glBindTexture(GL_TEXTURE_2D, texID);
for (int z = z0; z <= z1; z++) {
glTexSubImage2D(GL_TEXTURE_2D, 0,
x0, z, (x1 - x0 + 1), 1,
GL_LUMINANCE, GL_FLOAT, heightMap + (x0 + (z * xSize)));
}
glBindTexture(GL_TEXTURE_2D, 0);
}
/******************************************************************************/
/******************************************************************************/
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