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Lord and Savior Johan

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This commit is contained in:
kennyboy55
2016-05-26 12:53:22 +02:00
parent 908786897f
commit 56e174ae2f
8 changed files with 642 additions and 24 deletions
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HeightMap.cpp
+42 -12
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@@ -1,5 +1,6 @@
#include "HeightMap.h"
#include "stb_image.h"
#include "vector.h"
#include <GL/freeglut.h>
#include <iostream>
@@ -11,19 +12,28 @@ HeightMap::HeightMap(const std::string &file)
int bpp;
unsigned char* imgData = stbi_load(file.c_str(), &width, &height, &bpp, 4);
for (int h = 0; h < height; h++)
auto heightAt = [&](int x, int y)
{
for (int w = 0; w < width; w++)
return (imgData[(x + y * width) * 4] / 256.0f) * 100.0f;
};
for (int y = 0; y < height-1; y++)
{
for (int x = 0; x < width-1; x++)
{
int offsets[4][2] = { { 0, 0 },{ 1, 0 },{ 1, 1 },{ 0, 1 } };
Vec3f ca(0, heightAt(x, y + 1) - heightAt(x, y), 1);
Vec3f ba(1, heightAt(x + 1, y) - heightAt(x, y), 0);
Vec3f normal = ca.cross(ba);
normal.Normalize();
for (int i = 0; i < 4; i++)
{
float y = ((float)imgData[((h + offsets[i][0]) + (w + offsets[i][1]) * width) * 4]);
y = (y / 256.0f) * 100.0f;
vertices.push_back(Vertex{ (float)(h + offsets[i][0])*scale, y*scale, (float)(w + offsets[i][1])*scale,
0, 1, 0,
(h + offsets[i][0]) / (float)height, (w + offsets[i][1]) / (float)width } );
float h = heightAt(x + offsets[i][0], y + offsets[i][1]);
vertices.push_back(Vertex{ (float)(x + offsets[i][0])*scale, h*scale, (float)(y + offsets[i][1])*scale,
normal.x, normal.y, normal.z,
(x + offsets[i][0]) / (float)height, (y + offsets[i][1]) / (float)width } );
}
}
}
@@ -48,31 +58,51 @@ HeightMap::HeightMap(const std::string &file)
HeightMap::~HeightMap()
{
glDeleteTextures(1, &imageIndex);
}
void HeightMap::Draw()
{
glEnable(GL_LIGHTING);
float color[] = { 0.7f, 0.7f, 0.7f, 1 };
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, color);
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, color);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, imageIndex);
//glDisable(GL_TEXTURE_2D);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
//glEnableClientState(GL_COLOR_ARRAY);
//glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glVertexPointer(3, GL_FLOAT, sizeof(Vertex), ((float*)vertices.data()) + 0);
glTexCoordPointer(2, GL_FLOAT, sizeof(Vertex), ((float*)vertices.data()) + 6);
//glNormalPointer(GL_FLOAT, sizeof(Vertex), ((float*)cubeVertices.data()) + 3);
glNormalPointer(GL_FLOAT, sizeof(Vertex), ((float*)vertices.data()) + 3);
glDrawArrays(GL_QUADS, 0, vertices.size());
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
//glDisableClientState(GL_COLOR_ARRAY);
//glDisableClientState(GL_NORMAL_ARRAY);
glDisableClientState(GL_NORMAL_ARRAY);
}
void HeightMap::GetHeigth(float x, float z)
void HeightMap::GetHeigth(float x, float y)
{
x /= scale;
y /= scale;
int ix = x;
int iy = y;
int index = (ix + (width - 1) * iy) * 4;
Vertex& a = vertices[index];
Vertex& b = vertices[index+1];
Vertex& c = vertices[index+3];
//http://stackoverflow.com/questions/36090269/finding-height-of-point-on-height-map-triangles
}