alecgl_old/sfml20test/NoiseReader.cpp
Alec Obradovich 03f7d95b13 fuckmess
what is this nonsense
2015-04-08 16:35:21 -05:00

135 lines
No EOL
3.5 KiB
C++

#include "NoiseReader.h"
agl::NoiseReader::NoiseReader(char *filename) {
loadFromFile(filename);
}
float agl::NoiseReader::avgPixel(sf::Color c) {
return (c.r+c.g+c.b)/3;
}
int agl::NoiseReader::loadFromFile(char *filename) {
sf::Image tmp;
tmp.loadFromFile(filename);
rnum = ((tmp.getSize().x-1)*2)*(tmp.getSize().y-1);
vertexData = new float[rnum*3*3];
normalData = new float[rnum*3*3];
texData = new float[rnum*3*2];
printf("%i %i\n", tmp.getSize().x, tmp.getSize().y);
glm::vec3 *tmpv = new glm::vec3[3],
tmpn;
glm::vec2 *tmpt = new glm::vec2[3];
const float wmult = 1, hmult = .15;
int i = 0;
int ti = 0;
for(int y = 0; y < tmp.getSize().y-1; y++) {
for(int x = 0; x < tmp.getSize().x-1; x++) {
float h[] = {avgPixel(tmp.getPixel(x+1,y)), avgPixel(tmp.getPixel(x,y)), avgPixel(tmp.getPixel(x,y+1))};
tmpv[0] = glm::vec3((x+1)*wmult,h[0]*hmult,y*wmult);
tmpv[1] = glm::vec3(x*wmult,h[1]*hmult,y*wmult);
tmpv[2] = glm::vec3(x*wmult,h[2]*hmult,(y+1)*wmult);
int a = 2;
float b = 1.0f/float(a);
tmpt[0] = glm::vec2(b+b*(x%a), b+b*(y%a));
tmpt[1] = glm::vec2(b*(x%a), b+b*(y%a));
tmpt[2] = glm::vec2(b*(x%a), b*(y%a));
tmpn = -glm::cross(tmpv[0]-tmpv[1],tmpv[2]-tmpv[1]);
for(int w = 0; w < 3; w++) {
vertexData[i] = tmpv[w].x;
normalData[i] = tmpn.x;
texData[ti] = tmpt[w].x;
i++; ti++;
vertexData[i] = tmpv[w].y;
normalData[i] = tmpn.y;
texData[ti] = tmpt[w].y;
i++; ti++;
vertexData[i] = tmpv[w].z;
normalData[i] = tmpn.z;
i++;
}
h[0] = avgPixel(tmp.getPixel(x+1,y));
h[1] = avgPixel(tmp.getPixel(x,y+1));
h[2] = avgPixel(tmp.getPixel(x+1,y+1));
tmpv[0] = glm::vec3((x+1)*wmult,h[0]*hmult,y*wmult);
tmpv[1] = glm::vec3(x*wmult,h[1]*hmult,(y+1)*wmult);
tmpv[2] = glm::vec3((x+1)*wmult,h[2]*hmult,(y+1)*wmult);
tmpt[0] = glm::vec2(b+b*(x%a), b+b*(y%a));
tmpt[1] = glm::vec2(b*(x%a), b*(y%a));
tmpt[2] = glm::vec2(b+b*(x%a), b*(y%a));
tmpn = glm::cross(tmpv[0]-tmpv[2],tmpv[1]-tmpv[2]);
for(int w = 0; w < 3; w++) {
vertexData[i] = tmpv[w].x;
normalData[i] = tmpn.x;
texData[ti] = tmpt[w].x;
i++; ti++;
vertexData[i] = tmpv[w].y;
normalData[i] = tmpn.y;
texData[ti] = tmpt[w].y;
i++; ti++;
vertexData[i] = tmpv[w].z;
normalData[i] = tmpn.z;
i++;
}
}
}
glGenBuffers(1, &vbuf);
glBindBuffer(GL_ARRAY_BUFFER, vbuf);
glBufferData(GL_ARRAY_BUFFER, (rnum*3*3)*sizeof(float), vertexData, GL_STATIC_DRAW);
glGenBuffers(1, &nbuf);
glBindBuffer(GL_ARRAY_BUFFER, nbuf);
glBufferData(GL_ARRAY_BUFFER, (rnum*3*3)*sizeof(float), normalData, GL_STATIC_DRAW);
glGenBuffers(1, &tbuf);
glBindBuffer(GL_ARRAY_BUFFER, tbuf);
glBufferData(GL_ARRAY_BUFFER, (rnum*3*2)*sizeof(float), texData, GL_STATIC_DRAW);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glGenVertexArrays(1, &vao);
glBindVertexArray(vao);
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, vbuf);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, nbuf);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, (void*)0);
glEnableVertexAttribArray(2);
glBindBuffer(GL_ARRAY_BUFFER, tbuf);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 0, (void*)0);
glBindVertexArray(0);
return 0;
}
void agl::NoiseReader::Render() {
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, rnum*3);
glBindVertexArray(0);
}
agl::NoiseReader::~NoiseReader() {
}