Automatic shader inputs.

game/camera.py

@@ -13,14 +13,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from engine import vec3_origin, mat4, mat4_projection, mat4_orbit, resolve_input, set_input_mat4
+from engine import vec3_origin, mat4, mat4_projection, mat4_orbit, set_input_mat4
-
-class _Inputs:
-    __slots__ = 'projection', 'view'
-
-    def __init__(self, shader, projection, view):
-        self.projection = resolve_input(shader, projection)
-        self.view = resolve_input(shader, view)
 
 class Camera:
     __slots__ = 'yaw', 'pitch', 'distance', 'projection', 'view'
@@ -44,9 +37,6 @@ class Camera:
     def to_km(self):
         mat4_orbit(self.view, vec3_origin, self.yaw, self.pitch, self.distance * 0.001)
 
-    def resolve_inputs(self, shader, projection = b'u_projection', view = b'u_view'):
+    def set_inputs(self, shader):
-        return _Inputs(shader, projection, view)
+        set_input_mat4(shader.u_projection, self.projection)
-
+        set_input_mat4(shader.u_view, self.view)
-    def update_inputs(self, inputs):
-        set_input_mat4(inputs.projection, self.projection)
-        set_input_mat4(inputs.view, self.view)

game/environment.py

@@ -14,7 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from math import radians, cos
-from engine import vec3, mat4_mul_vec3, resolve_input, set_input_vec3
+from engine import vec3, mat4_mul_vec3, set_input_vec3
 from game.math import vec3_up, vec3_add, vec3_sub, vec3_scale, vec3_mul, vec3_dot
 
 def _angles(start, end):
@@ -62,16 +62,6 @@ def _resolve_color(ranges, c):
     w, (a, b) = _resolve(ranges, c)
     return vec3_add(a, vec3_scale(b, w))
 
-class _Inputs:
-    __slots__ = 'light_direction', 'light_color', 'horizon_color', 'sky_color', 'sun_color'
-
-    def __init__(self, shader):
-        self.light_direction = resolve_input(shader, b'u_light_direction')
-        self.light_color = resolve_input(shader, b'u_light_color')
-        self.horizon_color = resolve_input(shader, b'u_horizon_color')
-        self.sky_color = resolve_input(shader, b'u_sky_color')
-        self.sun_color = resolve_input(shader, b'u_sun_color')
-
 class Environment:
     __slots__ = 'light_direction', 'light_color', 'horizon_color', 'sky_color', 'sun_color'
 
@@ -91,12 +81,9 @@ class Environment:
         self.sky_color.set(*vec3_scale(_resolve_color(_sky_color, c), light_power))
         self.sun_color.set(*_resolve_color(_sun_color, c))
 
-    def resolve_inputs(self, shader):
+    def set_inputs(self, shader):
-        return _Inputs(shader)
+        set_input_vec3(shader.u_light_direction, self.light_direction)
-
+        set_input_vec3(shader.u_light_color, self.light_color)
-    def update_inputs(self, inputs):
+        set_input_vec3(shader.u_horizon_color, self.horizon_color)
-        set_input_vec3(inputs.light_direction, self.light_direction)
+        set_input_vec3(shader.u_sky_color, self.sky_color)
-        set_input_vec3(inputs.light_color, self.light_color)
+        set_input_vec3(shader.u_sun_color, self.sun_color)
-        set_input_vec3(inputs.horizon_color, self.horizon_color)
-        set_input_vec3(inputs.sky_color, self.sky_color)
-        set_input_vec3(inputs.sun_color, self.sun_color)

game/game.py

@@ -20,9 +20,9 @@ from ctypes import Structure
 from engine import *
 
 from game import math
-from game import shader
 from game import triangles
 from game import sea
+from game.shader import Shader
 from game.generator import Generator
 from game.resources import RuntimeArchive
 from game.batch import Batch
@@ -53,9 +53,9 @@ def main():
     mouse = Mouse(events, wheel = 60, wheel_min = 20)
     keyboard = Keyboard(events)
     render_initialize(__debug__)
-    terrain_shader = shader.load('terrain', 'common')
+    terrain_shader = Shader('terrain', 'common')
-    tests_shader = shader.load('tests', 'common')
+    tests_shader = Shader('tests', 'common')
-    sky_shader = shader.load('sky')
+    sky_shader = Shader('sky')
 
     heightmap = create_texture(
         TEXTURE_FORMAT_FLOAT_32, 256, 256, 0, TEXTURE_FLAG_MIN_LINEAR | TEXTURE_FLAG_MAG_LINEAR,
@@ -127,21 +127,13 @@ def main():
     cube_id = cube_model.spawn(tests_batch, cube_spawn_translation, mat3_identity)
     clouds_id = clouds_model.spawn(tests_batch, vec3(0.0, 0.0, 32.0), mat3_identity)
 
-    sea_phase = resolve_input(sky_shader, b'u_sea_phase')
     sea_polar_textures = sea.load_polar_textures(('data/sea_bump1.png', 'data/sea_bump2.png'))
     sea_detail_texture = sea.load_detail_texture('data/sea_bump.png')
     sky_triangles = create_triangles(triangles.sky_triangles(64, proj_far_z - 0.1, proj_ratio))
 
     camera = Camera()
     camera.set_projection(proj_hfov, proj_ratio, proj_near_z, proj_far_z)
-    terrain_camera_inputs = camera.resolve_inputs(terrain_shader)
-    tests_camera_inputs = camera.resolve_inputs(tests_shader)
-    sky_camera_inputs = camera.resolve_inputs(sky_shader)
-
     environment = Environment()
-    terrain_environment_inputs = environment.resolve_inputs(terrain_shader)
-    tests_environment_inputs = environment.resolve_inputs(tests_shader)
-    sky_environment_inputs = environment.resolve_inputs(sky_shader)
 
     blob_translation = tests_batch.translation[blob_id]
     cube_translation = tests_batch.translation[cube_id]
@@ -176,9 +168,9 @@ def main():
             camera.set_view(camera_yaw, camera_pitch, camera_distance)
             environment.from_sun(camera.view, sun_direction, sun_power)
 
-            select_shader(terrain_shader)
+            terrain_shader.select()
-            camera.update_inputs(terrain_camera_inputs)
+            camera.set_inputs(terrain_shader)
-            environment.update_inputs(terrain_environment_inputs)
+            environment.set_inputs(terrain_shader)
             select_texture(0, tiles_texture)
             select_texture(1, heightmap)
             select_texture(2, normalmap)
@@ -188,7 +180,7 @@ def main():
             unselect_texture(0, tiles_texture)
             unselect_texture(1, heightmap)
             unselect_texture(2, normalmap)
-            unselect_shader(terrain_shader)
+            terrain_shader.unselect()
 
             rotation = mat3()
             mat3_rotation(rotation, vec3_up, (current_time * 0.21) % tau)
@@ -197,9 +189,9 @@ def main():
             mat3_rotation(cube_orientation, vec3_up, (current_time * 0.43) % tau)
             mat3_rotation(clouds_orientation, vec3_up, (current_time * -0.037) % tau)
 
-            select_shader(tests_shader)
+            tests_shader.select()
-            camera.update_inputs(tests_camera_inputs)
+            camera.set_inputs(tests_shader)
-            environment.update_inputs(tests_environment_inputs)
+            environment.set_inputs(tests_shader)
             select_texture(0, tests_texture)
             select_texture(1, heightmap)
             select_texture(2, normalmap)
@@ -207,20 +199,20 @@ def main():
             unselect_texture(0, tests_texture)
             unselect_texture(1, heightmap)
             unselect_texture(2, normalmap)
-            unselect_shader(tests_shader)
+            tests_shader.unselect()
 
             camera.to_km()
 
-            select_shader(sky_shader)
+            sky_shader.select()
-            camera.update_inputs(sky_camera_inputs)
+            camera.set_inputs(sky_shader)
-            environment.update_inputs(sky_environment_inputs)
+            environment.set_inputs(sky_shader)
-            set_input_float(sea_phase, (current_time * 0.023) % 1.0)
+            set_input_float(sky_shader.u_sea_phase, (current_time * 0.023) % 1.0)
             select_texture(0, sea_polar_textures)
             select_texture(1, sea_detail_texture)
             draw_triangles(sky_triangles)
             unselect_texture(0, sea_polar_textures)
             unselect_texture(1, sea_detail_texture)
-            unselect_shader(sky_shader)
+            sky_shader.unselect()
 
             frame_end = time.thread_time()
             end_frame()
@@ -272,9 +264,9 @@ def main():
     destroy_texture(normalmap)
     destroy_triangles(sky_triangles)
     archive.destroy()
-    destroy_shader(terrain_shader)
+    del terrain_shader
-    destroy_shader(tests_shader)
+    del tests_shader
-    destroy_shader(sky_shader)
+    del sky_shader
     render_terminate()
     del events
     destroy_display(display)

game/shader.py

@@ -15,9 +15,7 @@
 
 from pathlib import Path
 
-from engine import load_shader
+from engine import load_shader, resolve_input, select_shader, unselect_shader, destroy_shader
-
-#TODO: preprocessing (at least includes)
 
 def _cleanup(line):
     return line.partition('//')[0].strip()
@@ -34,9 +32,9 @@ def _subst(line):
         return lines
     return [line]
 
-def _load_source(_path):
+def _load_source(path):
-    assert _path.exists()
+    assert path.exists()
-    lines = filter(_filter, map(_cleanup, open(_path, 'rt')))
+    lines = filter(_filter, map(_cleanup, open(path, 'rt')))
     source = []
     for line in lines:
         source.extend(_subst(line))
@@ -45,14 +43,41 @@ def _load_source(_path):
 def _convert(line):
     return bytes(line, 'utf-8') + b'\n'
 
-def load(vert_name, frag_name = ''):
+def _parse(shader, vert_lines, frag_lines):
+    uniforms = []
+    for line in vert_lines:
+        if line.startswith('uniform '):
+            uniforms.append(line.split()[-1].strip(';'))
+    for line in frag_lines:
+        if line.startswith('uniform '):
+            name = line.split()[-1].strip(';')
+            if name not in uniforms:
+                uniforms.append(name)
+    for name in uniforms:
+        setattr(shader, name, resolve_input(shader._shader, bytes(name, 'utf-8')))
+
+class Shader:
+    __slots__ = '_shader', '__dict__'
+
+    def __init__(self, vert_name, frag_name = ''):
         path = Path('.') / 'game' / 'shaders'
+        assert path.exists()
         if not frag_name:
             frag_name = vert_name
         print("Loading vertex shader", vert_name)
-    vert_lines = list(map(_convert, _load_source(path / (vert_name + '_opengles.vert'))))
+        vert_lines = _load_source(path / (vert_name + '_opengles.vert'))
         assert vert_lines
         print("Loading fragment shader", frag_name)
-    frag_lines = list(map(_convert, _load_source(path / (frag_name + '_opengles.frag'))))
+        frag_lines = _load_source(path / (frag_name + '_opengles.frag'))
         assert frag_lines
-    return load_shader(vert_lines, frag_lines)
+        self._shader = load_shader(list(map(_convert, vert_lines)), list(map(_convert, frag_lines)))
+        _parse(self, vert_lines, frag_lines)
+
+    def __del__(self):
+        destroy_shader(self._shader)
+
+    def select(self):
+        select_shader(self._shader)
+
+    def unselect(self):
+        unselect_shader(self._shader)