added example for Window opengl

Author: oddbookworm

examples/window_opengl.py

@@ -0,0 +1,76 @@
+""" pygame.examples.window_opengl
+
+Slightly modified version of the example at https://github.com/szabolcsdombi/zengl/blob/main/examples/pygame/hello_world.py
+Modified to use Window API instead of the display module
+
+Posted here with permission from https://github.com/szabolcsdombi given in the PGC discord server
+"""
+
+import pygame
+import zengl
+
+window_size = (1280, 720)
+
+pygame.init()
+window = pygame.Window(size=window_size, opengl=True)
+
+ctx = zengl.context()
+
+image = ctx.image(window_size, "rgba8unorm", samples=4)
+
+pipeline = ctx.pipeline(
+    vertex_shader="""
+        #version 330 core
+
+        out vec3 v_color;
+
+        vec2 vertices[3] = vec2[](
+            vec2(0.0, 0.8),
+            vec2(-0.6, -0.8),
+            vec2(0.6, -0.8)
+        );
+
+        vec3 colors[3] = vec3[](
+            vec3(1.0, 0.0, 0.0),
+            vec3(0.0, 1.0, 0.0),
+            vec3(0.0, 0.0, 1.0)
+        );
+
+        void main() {
+            gl_Position = vec4(vertices[gl_VertexID], 0.0, 1.0);
+            v_color = colors[gl_VertexID];
+        }
+    """,
+    fragment_shader="""
+        #version 330 core
+
+        in vec3 v_color;
+
+        layout (location = 0) out vec4 out_color;
+
+        void main() {
+            out_color = vec4(v_color, 1.0);
+            out_color.rgb = pow(out_color.rgb, vec3(1.0 / 2.2));
+        }
+    """,
+    framebuffer=[image],
+    topology="triangles",
+    vertex_count=3,
+)
+
+clock = pygame.Clock()
+
+while True:
+    for event in pygame.event.get():
+        if event.type == pygame.QUIT:
+            pygame.quit()
+            quit()
+
+    ctx.new_frame()
+    image.clear()
+    pipeline.render()
+    image.blit()
+    ctx.end_frame()
+
+    window.flip()
+    clock.tick(60)