chip8 experiment (incomplete)

arcade/experimental/examples/chip8_display.py

@@ -0,0 +1,77 @@
+"""
+CHIP-8 is an interpreted minimalist programming language that was designed by
+Joseph Weisbecker in the 1970s for use on the RCA COSMAC VIP computer.
+
+This example renders a 64 x 32 pixel display. The pixel format is using
+bits to represent what pixel is enabled/disabled so the byte size of
+the buffer is 8 x 4 = 32 bytes.
+
+References: 
+http://mattmik.com/files/chip8/mastering/chip8.html
+https://github.com/JohnEarnest/Octo
+"""
+import math
+from array import array
+
+import arcade
+from arcade.gl import geometry
+from arcade import get_projection
+
+# Do the math to figure out our screen dimensions
+SCREEN_WIDTH = 64 * 10
+SCREEN_HEIGHT = 32 * 10
+SCREEN_TITLE = "CHIP-8 Screen"
+
+
+class MyGame(arcade.Window):
+
+    def __init__(self, width, height, title):
+        """CHIP-8 Screen"""
+        super().__init__(width, height, title)
+        self.program = self.ctx.program(
+            vertex_shader="""
+            #version 330
+            uniform mat4 projection;
+            in vec2 in_vert;
+            in vec2 in_uv;
+            out vec2 v_uv;
+            void main() {
+                gl_Position = projection * vec4(in_vert, 0.0, 1.0);
+                v_uv = in_uv;
+            }
+            """,
+            fragment_shader="""
+            #version 330
+            uniform usampler2D screen;
+            in vec2 v_uv;
+            out vec4 out_color;
+            void main() {
+                out_color = vec4(vec3(texture(screen, v_uv * vec2(1.0, -1.0)).r), 1.0);
+            }
+            """
+        )
+        # 8 x 4 
+        self.program['projection'] = get_projection().flatten()
+        self.program['screen'] = 0
+        self.quad = geometry.screen_rectangle(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT)
+        self.texture = self.ctx.texture((8, 4), components=1, dtype='i1')
+        self.texture.write(array(
+            'B',
+            [
+                # 62 x 32 screen
+                0xF0, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xF0,
+                0x00, 0x00, 0x00, 0x00, 0xFF, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xF0,
+            ]
+        ).tobytes())
+
+    def on_draw(self):
+        self.clear()
+        self.texture.use(0)
+        self.quad.render(self.program)
+
+
+if __name__ == "__main__":
+    MyGame(SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_TITLE)
+    arcade.run()