Added heightmap

2016-05-25 11:31:37 +02:00
parent 47c228205a
commit 965b54c901
12 changed files with 154 additions and 23 deletions
@@ -0,0 +1,99 @@
+#include "HeightMap.h"
+#include "stb_image.h"
+
+#include <GL/freeglut.h>
+#include <iostream>
+#include <string>
+
+
+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++)
+	{
+		for (int w = 0; w < width; w++)
+		{
+			int offsets[4][2] = { { 0, 0 },{ 1, 0 },{ 1, 1 },{ 0, 1 } };
+			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 } );
+			}
+		}
+	}
+
+	glGenTextures(1, &imageIndex);
+	glBindTexture(GL_TEXTURE_2D, imageIndex);
+
+	glTexImage2D(GL_TEXTURE_2D,
+		0,					//level
+		GL_RGBA,			//internal format
+		width,				//width
+		height,				//height
+		0,					//border
+		GL_RGBA,			//data format
+		GL_UNSIGNED_BYTE,	//data type
+		imgData);			//data
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	stbi_image_free(imgData);
+}
+
+HeightMap::~HeightMap()
+{
+}
+
+void HeightMap::Draw()
+{
+	glEnable(GL_TEXTURE_2D);
+	glBindTexture(GL_TEXTURE_2D, imageIndex);
+
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+	//glEnableClientState(GL_COLOR_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);
+	glDrawArrays(GL_QUADS, 0, vertices.size());
+
+	glDisableClientState(GL_VERTEX_ARRAY);
+	glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+	//glDisableClientState(GL_COLOR_ARRAY);
+	//glDisableClientState(GL_NORMAL_ARRAY);
+}
+
+void HeightMap::GetHeigth(float x, float z)
+{
+
+}
+
+void HeightMap::SetTexture(const std::string &file)
+{
+	int bpp, width2, height2;
+	unsigned char* imgData = stbi_load(file.c_str(), &width2, &height2, &bpp, 4);
+
+	glBindTexture(GL_TEXTURE_2D, imageIndex);
+
+	glTexImage2D(GL_TEXTURE_2D,
+		0,		//level
+		GL_RGBA,		//internal format
+		width2,		//width
+		height2,		//height
+		0,		//border
+		GL_RGBA,		//data format
+		GL_UNSIGNED_BYTE,	//data type
+		imgData);		//data
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+	stbi_image_free(imgData);
+}