working triangles

1 files changed, 60 insertions, 3 deletions

diff --git a/txtgameengine/platform.py b/txtgameengine/platform.py
index 0d89213..f5b8ded 100644
--- a/txtgameengine/platform.py
+++ b/txtgameengine/platform.py
@@ -1,7 +1,8 @@
 import glfw
 import typing
 
-from OpenGL import GL
+from OpenGL.GL import *
+import OpenGL.GL.shaders as shaders
 
 if typing.TYPE_CHECKING:
     from .app import TxtGameApp
@@ -20,6 +21,7 @@ class PlatformComponent:
         glfw.init()
         self.init_window()
         glfw.make_context_current(self.window)
+        glViewport(0, 0, *self.app.size)
 
     @staticmethod
     def monotonic_time():
@@ -32,6 +34,9 @@ class PlatformComponent:
     def init_window(self):
         glfw.window_hint(glfw.CLIENT_API, glfw.OPENGL_API)
         glfw.window_hint(glfw.RESIZABLE, glfw.FALSE)
+        glfw.window_hint(glfw.OPENGL_FORWARD_COMPAT, glfw.TRUE)
+        glfw.window_hint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)
+        glfw.window_hint(glfw.OPENGL_DEBUG_CONTEXT, glfw.TRUE)
         glfw.window_hint(glfw.CONTEXT_VERSION_MAJOR, 3)
         glfw.window_hint(glfw.CONTEXT_VERSION_MINOR, 3)
         self.window = glfw.create_window(
@@ -60,8 +65,60 @@ class PlatformComponent:
 
     @staticmethod
     def set_clear_color(r, g, b, a):
-        GL.glClearColor(r, g, b, a)
+        glClearColor(r, g, b, a)
+
+    @staticmethod
+    def print_debug_message(source, msg_type, msg_id, severity, length, raw, user):
+        print('OPENGL ERROR', source, msg_type, msg_id, severity)
+
+    def check_debug(self):
+        assert (glGetIntegerv(GL_CONTEXT_FLAGS)
+                & GL_CONTEXT_FLAG_DEBUG_BIT) != 0
+        glDebugMessageCallback(GLDEBUGPROC(self.print_debug_message), None)
 
     @staticmethod
     def clear_background(depth_buffer=False):
-        GL.glClear(GL.GL_COLOR_BUFFER_BIT | (depth_buffer and GL.GL_DEPTH_BUFFER_BIT or 0))
+        glClear(GL_COLOR_BUFFER_BIT | (
+            depth_buffer and GL_DEPTH_BUFFER_BIT or 0))
+
+
+class ShaderComponent:
+    def __init__(self, app: 'TxtGameApp'):
+        self.app = app
+
+    @staticmethod
+    def load_shaders(vertex_file, fragment_file):
+        with open(vertex_file) as fp:
+            vertex_source = fp.read()
+        with open(fragment_file) as fp:
+            fragment_source = fp.read()
+        vertex_shader = shaders.compileShader(vertex_source, GL_VERTEX_SHADER)
+        fragment_shader = shaders.compileShader(
+            fragment_source, GL_FRAGMENT_SHADER)
+        return shaders.compileProgram(vertex_shader, fragment_shader)
+
+
+class RenderComponent:
+    def __init__(self, app: 'TxtGameApp'):
+        self.app = app
+
+    @staticmethod
+    def setup_vertex_arrays():
+        arr = glGenVertexArrays(1)
+        glBindVertexArray(arr)
+
+    @staticmethod
+    def setup_triangle(arr):
+        buf = glGenBuffers(1)
+        glBindBuffer(GL_ARRAY_BUFFER, buf)
+        glBufferData(GL_ARRAY_BUFFER, arr.itemsize *
+                     arr.size, arr, GL_STATIC_DRAW)
+        return buf
+
+    @staticmethod
+    def triangle(buf):
+        glEnableVertexAttribArray(0)
+        glBindBuffer(GL_ARRAY_BUFFER, buf)
+        glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, None)
+        glDrawArrays(GL_TRIANGLES, 0, 3)
+        glDisableVertexAttribArray(0)