opengl_x11

commit 3e182313eb72b66426a814c3d1d8725165a26f83
parent db78243437c28ef7ea818f63f3a11acd6c68c6be
Author: bsandro <email@bsandro.tech>
Date:   Mon,  6 Oct 2025 23:05:22 +0300

still leaking memory

Diffstat:
M
Makefile
 | 
2
+-
M
main1.c
 | 
100
++++++++++++++++++++++++++++++++++++++++++-------------------------------------

2 files changed, 54 insertions(+), 48 deletions(-)
diff --git a/Makefile b/Makefile
@@ -1,5 +1,5 @@
 all:
-	${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
+	${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 -lm -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
@@ -3,6 +3,7 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
+#include <math.h>
 #include <X11/X.h>
 #include <X11/Xlib.h>
 #define GL_GLEXT_PROTOTYPES 1
@@ -25,6 +26,8 @@ static const double current_ts() {
     return (double)ts.tv_sec + (double)ts.tv_nsec/1e9;
 }
 
+static double t_started;
+
 static const GLchar *vertexSrc = "      \n\
 #version 420                            \n\
 in vec3 position;                       \n\
@@ -33,14 +36,14 @@ void main() {                           \n\
 }                                       \n\
 ";
 
-static const GLchar *fragmentSrc = "    \n\
-#version 420                            \n\
-uniform double iTime;                   \n\
-uniform float alpha;                    \n\
-out vec4 outColor;                      \n\
-void main() {                           \n\
-    outColor = vec4(sin(float(iTime)), 0.5, 0.3, sin(float(iTime)));\n\
-}                                       \n\
+static const GLchar *fragmentSrc = "     \n\
+#version 420                             \n\
+uniform double iTime;                    \n\
+out vec4 outColor;                       \n\
+void main() {                            \n\
+    float c = abs(sin(float(iTime))); \n\
+    outColor = vec4(c, 0.5, 0.3, 1.0);   \n\
+}                                        \n\
 ";
 
 static GLuint mkShader(GLenum type, const GLchar *src) {
@@ -67,48 +70,13 @@ static GLuint linkProgram(GLuint vertex, GLuint fragment) {
     return shaderProgram;
 }
 
-void DrawThing() {
-    glClearColor(0.1f, 0.1f, 0.15f, 1.0f);
-    glClear(GL_COLOR_BUFFER_BIT);
-
-    GLuint vao;
-    glGenVertexArrays(1, &vao);
-    glBindVertexArray(vao);
-
-    GLfloat vertices[] = {
-          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;
-    glGenBuffers(1, &vbo);
-    glBindBuffer(GL_ARRAY_BUFFER, vbo);
-    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
-
-    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, sizeof(vertices)/sizeof(GLfloat)/3);
-    glDisableVertexAttribArray(0);
-    glUseProgram(0);
+void DrawThing(GLuint shaderPrg) {
+    
 }
 
 void __attribute__((constructor)) start() {
     printf("start()\n");
+    t_started = current_ts();
 }
 
 void __attribute((destructor)) end() {
@@ -141,6 +109,30 @@ int main(int argc, char *argv[]) {
     XStoreName(dpy, win, "OPENGL");
     GLXContext ctx = glXCreateContext(dpy, vi, NULL, GL_TRUE);
     glXMakeCurrent(dpy, win, ctx);
+
+    GLuint vao;
+    glGenVertexArrays(1, &vao);
+    glBindVertexArray(vao);
+
+    static const GLfloat vertices[] = {
+          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;
+    glGenBuffers(1, &vbo);
+    glBindBuffer(GL_ARRAY_BUFFER, vbo);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    GLuint vertex = mkShader(GL_VERTEX_SHADER, vertexSrc);
+    GLuint fragment = mkShader(GL_FRAGMENT_SHADER, fragmentSrc);
+    GLuint shaderPrg = linkProgram(vertex, fragment);
+
     while (1) {
         while (XPending(dpy)) {
             XEvent xev;
@@ -163,7 +155,21 @@ int main(int argc, char *argv[]) {
             }
         }
 
-        DrawThing();
+        glClearColor(0.1f, 0.1f, 0.15f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        GLfloat iTime = glGetUniformLocation(shaderPrg, "iTime");
+        glUniform1d(iTime, current_ts()-t_started);
+        //printf("%f\n", fabsf(sinf(current_ts()-t_started)));
+
+        glUseProgram(shaderPrg);
+
+        glEnableVertexAttribArray(0);
+        glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, (const GLvoid *)0);
+        glDrawArrays(GL_TRIANGLES, 0, sizeof(vertices)/sizeof(GLfloat)/3);
+        //glDisableVertexAttribArray(0);
+        //glUseProgram(0);
+
         glXSwapBuffers(dpy, win);
         usleep(1000*16);
     }