From 0c88f7d7ffb82a729df516a91847bcf0a1ee68d4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anton=20Luka=20=C5=A0ijanec?= <anton@sijanec.eu>
Date: Tue, 10 May 2022 00:53:01 +0200
Subject: opengl animacija

---
 fiz/naloga/gl/helmholtz.c | 43 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 35 insertions(+), 8 deletions(-)

(limited to 'fiz/naloga/gl/helmholtz.c')

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();
-- 
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