opengl_x11

commit 9e27f5e0bb85d094da7b93b84b0190f201fa9c1c
parent 1fafa50a4833e1c448f3773c37d44466bdad90f0
Author: bsandro <email@bsandro.tech>
Date:   Wed, 26 Nov 2025 22:30:04 +0200

geometry shader

Diffstat:
M
obj2d.c
 | 
13
++++++++-----

1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/obj2d.c b/obj2d.c
@@ -57,7 +57,6 @@ void main() {
     EmitVertex();
     gl_Position = p+vec4(-0.1, -0.1, 0.0, 0.0);
     EmitVertex();
-
     EndPrimitive();
 }
 )";
@@ -153,10 +152,11 @@ int main(int argc, char *argv[]) {
     glBindVertexArray(vao);
 
     // x,y
-    static const GLfloat vertices[] = {
-        -0.5, -0.5,
-         0.5, -0.5,
-         0.5,  0.5
+    static const GLfloat vertices[][2] = {
+        {-0.3, -0.5},
+        { 0.6, -0.1},
+        { 0.4,  0.4},
+        {-0.5,  0.6}
     };
 
     GLuint vbo;
@@ -177,6 +177,9 @@ int main(int argc, char *argv[]) {
     glVertexAttribPointer(position, 2, GL_FLOAT, GL_FALSE, 2*sizeof(GLfloat), (void *)0);
     glEnableVertexAttribArray(position);
 
+    glLineWidth(1.f);
+    glPointSize(4.f);
+
     while (1) {
         while (XPending(dpy)) {
             XEvent xev;