opengl_x11

commit db78243437c28ef7ea818f63f3a11acd6c68c6be
parent dd3672d3ac6aec861233f3ad77f65525cc0a26ee
Author: bsandro <email@bsandro.tech>
Date:   Mon,  6 Oct 2025 21:58:25 +0300

leaking mem left and right

Diffstat:
M
Makefile
 | 
2
+-
M
main1.c
 | 
98
+++++++++++++++++++++++++++++++++++++++++++++----------------------------------

2 files changed, 57 insertions(+), 43 deletions(-)
diff --git a/Makefile b/Makefile
@@ -1,5 +1,5 @@
 all:
-	${CC} main1.c -std=c99 -Wpedantic -Os -s -fomit-frame-pointer -ffast-math -fno-stack-protector -march=native -fwrapv -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables -fno-unwind-tables -fmerge-all-constants -fno-ident -lGL -lGLU -lX11 -Wl,--gc-sections -o test1
+	${CC} main1.c -std=gnu23 -Wpedantic -Os -s -fomit-frame-pointer -ffast-math -fno-stack-protector -march=native -fwrapv -ffunction-sections -fdata-sections -fno-asynchronous-unwind-tables -fno-unwind-tables -fmerge-all-constants -fno-ident -lGL -lGLU -lX11 -Wl,--gc-sections -o test1
 
 min: all
 	strip -S --strip-unneeded --remove-section=.note.gnu.gold-version --remove-section=.comment --remove-section=.note --remove-section=.note.gnu.build-id --remove-section=.note.ABI-tag ./test1
diff --git a/main1.c b/main1.c
@@ -1,6 +1,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
+#include <unistd.h>
 #include <X11/X.h>
 #include <X11/Xlib.h>
 #define GL_GLEXT_PROTOTYPES 1
@@ -17,8 +19,14 @@ Window                  win;
 XWindowAttributes       gwa;
 XEvent                  xev;
 
+static const double current_ts() {
+    struct timespec ts;
+    timespec_get(&ts, TIME_UTC);
+    return (double)ts.tv_sec + (double)ts.tv_nsec/1e9;
+}
+
 static const GLchar *vertexSrc = "      \n\
-#version 150 core                       \n\
+#version 420                            \n\
 in vec3 position;                       \n\
 void main() {                           \n\
     gl_Position = vec4(position, 1.0);  \n\
@@ -26,10 +34,12 @@ void main() {                           \n\
 ";
 
 static const GLchar *fragmentSrc = "    \n\
-#version 150 core                       \n\
+#version 420                            \n\
+uniform double iTime;                   \n\
+uniform float alpha;                    \n\
 out vec4 outColor;                      \n\
 void main() {                           \n\
-    outColor = vec4(0.7, 0.5, 0.3, 1.0);\n\
+    outColor = vec4(sin(float(iTime)), 0.5, 0.3, sin(float(iTime)));\n\
 }                                       \n\
 ";
 
@@ -61,33 +71,18 @@ void DrawThing() {
     glClearColor(0.1f, 0.1f, 0.15f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT);
 
-    /*glBegin(GL_TRIANGLES);
-        // Vertex data
-        glColor3f(1.0f, 0.0f, 0.0f);
-        glVertex3f(-0.3f, 0.0f, 0.0f);
-        glColor3f(0.0f, 1.0f, 0.0f);
-        glVertex3f(0.3f, 0.1f, 0.0f);
-        glColor3f(1.0f, 0.0f, 1.0f);
-        glVertex3f(0.0f, 0.8f, 0.0f);
-    glEnd();
-
-    glBegin(GL_POLYGON);
-        glColor3f(0.8f, 0.0f, 0.0f);
-        glVertex3f(0.5f, 0.5f, 0.5f);
-        glVertex3f(0.1f, 0.1f, 0.1f);
-        glVertex3f(-0.1f, -0.1f, 0.1f);
-        glVertex3f(0.4f, 0.0f, 0.0f);
-        glVertex3f(-0.4f, 0.0f, 0.3f);
-    glEnd();*/
-
     GLuint vao;
     glGenVertexArrays(1, &vao);
     glBindVertexArray(vao);
 
     GLfloat vertices[] = {
-         0.0f, 0.0f, 0.0f,
-         0.4f, 0.0f, 0.0f,
-         0.0f, 0.4f, 0.0f
+          0.01f,  0.01f, 0.0f,
+          0.4f,   0.0f,  0.0f,
+          0.0f,   0.4f,  0.0f,
+
+         -0.01f, -0.01f, 0.0f,
+         -0.4f,   0.0f,  0.0f,
+          0.0f,  -0.4f,  0.0f
     };
 
     GLuint vbo;
@@ -98,15 +93,28 @@ void DrawThing() {
     GLuint vertex = mkShader(GL_VERTEX_SHADER, vertexSrc);
     GLuint fragment = mkShader(GL_FRAGMENT_SHADER, fragmentSrc);
     GLuint shaderPrg = linkProgram(vertex, fragment);
+
+    GLfloat iTime = glGetUniformLocation(shaderPrg, "iTime");
+    glUniform1d(iTime, current_ts());
+    printf("%f\n", current_ts());
+
     glUseProgram(shaderPrg);
 
     glEnableVertexAttribArray(0);
     glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)0);
-    glDrawArrays(GL_TRIANGLES, 0, 3);
+    glDrawArrays(GL_TRIANGLES, 0, sizeof(vertices)/sizeof(GLfloat)/3);
     glDisableVertexAttribArray(0);
     glUseProgram(0);
 }
 
+void __attribute__((constructor)) start() {
+    printf("start()\n");
+}
+
+void __attribute((destructor)) end() {
+    printf("end()\n");
+}
+
 int main(int argc, char *argv[]) {
     dpy = XOpenDisplay(NULL);
 
@@ -133,24 +141,30 @@ int main(int argc, char *argv[]) {
     XStoreName(dpy, win, "OPENGL");
     GLXContext ctx = glXCreateContext(dpy, vi, NULL, GL_TRUE);
     glXMakeCurrent(dpy, win, ctx);
-    float p = .0f;
     while (1) {
-        // while (XPending(dpy)) ???
-        XNextEvent(dpy, &xev);
-        if (xev.type == Expose) {
-            XGetWindowAttributes(dpy, win, &gwa);
-            glViewport(0, 0, gwa.width, gwa.height);
-            DrawThing();
-            glXSwapBuffers(dpy, win);
-        } else if (xev.type == KeyPress) {
-            printf("btn:%d\n", xev.xbutton.button);
-            if (xev.xbutton.button==24||xev.xbutton.button==9) {
-                glXMakeCurrent(dpy, None, NULL);
-                glXDestroyContext(dpy, ctx);
-                XDestroyWindow(dpy, win);
-                XCloseDisplay(dpy);
-                exit(0);
+        while (XPending(dpy)) {
+            XEvent xev;
+            XNextEvent(dpy, &xev);
+            if (xev.type == Expose) {
+                XGetWindowAttributes(dpy, win, &gwa);
+                glViewport(0, 0, gwa.width, gwa.height);
+            } else if (xev.type == KeyPress) {
+                printf("btn:%d\n", xev.xbutton.button);
+                if (xev.xbutton.button==24||xev.xbutton.button==9) {
+                    glXMakeCurrent(dpy, None, NULL);
+                    glXDestroyContext(dpy, ctx);
+                    XDestroyWindow(dpy, win);
+                    XCloseDisplay(dpy);
+                    exit(0);
+                }
+            } else if (xev.type == ConfigureNotify) {
+                XConfigureEvent *ce = (XConfigureEvent *)&xev;
+                glViewport(0, 0, ce->width, ce->height);
             }
         }
+
+        DrawThing();
+        glXSwapBuffers(dpy, win);
+        usleep(1000*16);
     }
 }