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authorAnton Luka Šijanec <anton@sijanec.eu>2022-05-10 00:53:01 +0200
committerAnton Luka Šijanec <anton@sijanec.eu>2022-05-10 00:53:01 +0200
commit0c88f7d7ffb82a729df516a91847bcf0a1ee68d4 (patch)
tree34f251e14ac652f405075d992560cadad83ec9bd /fiz
parenthelmholtz gl (diff)
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Diffstat (limited to 'fiz')
-rw-r--r--fiz/naloga/gl/fragment.glsl41
-rw-r--r--fiz/naloga/gl/helmholtz.c43
2 files changed, 67 insertions, 17 deletions
diff --git a/fiz/naloga/gl/fragment.glsl b/fiz/naloga/gl/fragment.glsl
index c4952c4..095cb78 100644
--- a/fiz/naloga/gl/fragment.glsl
+++ b/fiz/naloga/gl/fragment.glsl
@@ -1,11 +1,10 @@
#version 330
-#pragma optionNV (unroll 1)
+// #pragma optionNV (unroll 1)
#define show_vec
#define SEG 32
-#define R .8
#define I .5
#define n 100.
@@ -18,12 +17,11 @@ uniform int OPTIONS;
out vec4 fragColor;
-vec3 tuljava (vec3 pz) {
+vec3 tuljava (vec3 pz, float R) {
float dr = 2. * PI / float(SEG);
vec3 sum = vec3(0);
for (int i = 0; i < SEG; i++){
float theta = dr * float(i);
- // jebi se, zakaj neza? pisat ?ita linearno >:(
vec3 dl = vec3(0,cos(theta),-sin(theta))*dr*R;
vec3 r = vec3(0,sin(theta),cos(theta))*R;
r+=pz;
@@ -33,13 +31,38 @@ vec3 tuljava (vec3 pz) {
return sum;
}
+
void main () {
+ float R = 0.8;
+ float R2 = abs(sin((time+8.2)/.6))+0.5;
vec2 uv = UVo;
- vec3 poz = vec3(uv*2.,sin(time/10.)*R);
- vec3 offset = vec3(R/2.,0,0);
-
- vec3 rez = tuljava(poz+offset)*n*I +
- tuljava(poz-offset)*n*I;
+ vec2 poz = vec2(uv*2.); // zavrteti moramo tako točke same, kot tudi
+ vec2 offset = vec2(R/2.,0); // njihove komponente
+ float kot = time/.4;
+ float multi = n*I/**abs(sin(time/.2)+0.2)*/;
+ vec2 dodatek = vec2(sin(time/.6)*.5, cos(time/.4)*.6);
+ vec3 rez = tuljava(
+ vec3(poz+offset, 1/2*R), R
+ )*n*I +
+ tuljava(
+ vec3(
+ vec2(poz-offset+dodatek)*
+ mat2( cos(kot),
+ sin(kot), -sin(kot),
+ cos(kot)
+ ),
+ 1/2*R
+ ),
+ R2
+ )*multi*mat3( cos(kot),
+ sin(kot),
+ 0,
+ -sin(kot),
+ cos(kot),
+ 0,
+ 0,
+ 0,
+ 1);
rez *= 1000.;
#ifdef show_vec
fragColor = vec4(rez, 1);
diff --git a/fiz/naloga/gl/helmholtz.c b/fiz/naloga/gl/helmholtz.c
index cbc1db3..5f8f44d 100644
--- a/fiz/naloga/gl/helmholtz.c
+++ b/fiz/naloga/gl/helmholtz.c
@@ -1,9 +1,12 @@
#include <stdlib.h>
#include <stdio.h>
-#include <complex.h>
#include <unistd.h>
#include <GL/glxew.h>
#include <GLFW/glfw3.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mman.h>
extern char _binary_vertex_glsl_start[];
extern char _binary_vertex_glsl_end[];
extern char _binary_fragment_glsl_start[];
@@ -63,15 +66,10 @@ int main (void) {
const char * vertex = _binary_vertex_glsl_start;
const char * fragment = _binary_fragment_glsl_start;
#define DO_SHADER(whi, WHI) \
- fprintf(stderr, "shader code:\n%.*s\n", whi##_len, whi); \
- fprintf(stderr, "glCreateShader ...\n"); \
GLuint whi##_shader = glCreateShader(GL_##WHI##_SHADER); \
- fprintf(stderr, "glShaderSource ...\n"); \
glShaderSource(whi##_shader, 1, &whi, &whi##_len); \
- fprintf(stderr, "glCompileShader ...\n"); \
glCompileShader(whi##_shader); \
GLint whi##_success = 0; \
- fprintf(stderr, "glGetShaderiv ...\n"); \
glGetShaderiv(whi##_shader, GL_COMPILE_STATUS, &whi##_success); \
if (whi##_success == GL_FALSE) { \
GLint logSize = 0; \
@@ -110,18 +108,47 @@ int main (void) {
GLuint optI = glGetUniformLocation(program, "OPTIONS");
uint32_t opts = 123456;
glClearColor(0.1, 0.2, 0.3, 1);
+ unsigned frame = 0;
+ getchar(); // da vmes odpremo okno v floating načinu s pravilno velikostjo
while (!glfwWindowShouldClose(okno)) {
int w, h;
glfwGetFramebufferSize(okno, &w, &h);
glViewport(0, 0, w, h);
glClear(GL_COLOR_BUFFER_BIT);
glUseProgram(program); // testiraj, mogoče se to sme dat iz loopa gor
- glUniform1f(timeI, glfwGetTime());
+ glUniform1f(timeI, (float) frame/60);
glUniform1i(optI, opts++);
glBindVertexArray(vao);
glDrawArrays(GL_TRIANGLES, 0, 6 /* dva triangla po 3 */);
glfwSwapBuffers(okno);
- glfwWaitEvents(); // glfwPollEvents pa returna takoj
+ glfwPollEvents(); // wait / poll
+ frame++;
+ char fn[25];
+ sprintf(fn, "animacija%04d.ppm", frame);
+ int fd;
+ if ((fd = open(fn, O_CREAT | O_RDWR, 00664)) == -1) {
+ perror("open");
+ abort();
+ }
+ if (ftruncate(fd, 128+w*h*3) == -1) {
+ perror("ftruncate");
+ abort();
+ }
+ void * p;
+ if ((p = mmap(NULL, 128+w*h*3, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) {
+ perror("mmap");
+ abort();
+ }
+ sprintf(p, "P6\n\n%57d\n%57d\n255\n", w, h);
+ glReadPixels(0, 0, w, h, GL_RGB, GL_UNSIGNED_BYTE, (unsigned char *) p + 128);
+ if (munmap(p, 128+w*h*3) == -1) {
+ perror("munmap");
+ abort();
+ }
+ if (close(fd) == -1) {
+ perror("close");
+ abort();
+ }
}
glfwDestroyWindow(okno);
glfwTerminate();