Switch clouds to shaders.

punyverse/entity.py

@@ -5,7 +5,7 @@ from pyglet.gl import *
 # noinspection PyUnresolvedReferences
 from six.moves import range
 
-from punyverse.glgeom import compile, glRestore, belt, Sphere, Disk, OrbitVBO, Matrix4f, SimpleSphere, TangentSphere
+from punyverse.glgeom import compile, glRestore, belt, Disk, OrbitVBO, Matrix4f, SimpleSphere, TangentSphere
 from punyverse.model import load_model, WavefrontVBO
 from punyverse.orbit import KeplerOrbit
 from punyverse.texture import get_best_texture, load_clouds
@@ -32,9 +32,14 @@ class Entity(object):
     def mv_matrix(self):
         return self.world.view_matrix() * self.model_matrix
 
+    @cached_property
+    def mvp_matrix(self):
+        return self.world.vp_matrix * self.model_matrix
+
     def update(self):
         self.model_matrix = None
         self.mv_matrix = None
+        self.mvp_matrix = None
         x, y, z = self.location
         dx, dy, dz = self.direction
         self.location = x + dx, y + dy, z + dz
@@ -316,8 +321,9 @@ class SphericalBody(Body):
             atm_texture = atmosphere_data.get('diffuse_texture', None)
             cloud_texture = atmosphere_data.get('cloud_texture', None)
             if cloud_texture is not None:
-                self.cloud_texture = get_best_texture(cloud_texture, loader=load_clouds)
-                self.clouds = Sphere(self.radius + 2, division, division)
+                self.cloud_transparency = get_best_texture(cloud_texture, loader=load_clouds)
+                self.cloud_radius = self.radius + 2
+                self.clouds = self._get_sphere(division, tangent=False)
 
             if atm_texture is not None:
                 self.atm_texture = get_best_texture(atm_texture, clamp=True)
@@ -341,7 +347,7 @@ class SphericalBody(Body):
         shader.uniform_float('u_radius', self.radius)
         shader.uniform_mat4('u_modelMatrix', self.model_matrix)
         shader.uniform_mat4('u_mvMatrix', self.mv_matrix)
-        shader.uniform_mat4('u_mvpMatrix', self.world.vp_matrix * self.model_matrix)
+        shader.uniform_mat4('u_mvpMatrix', self.mvp_matrix)
 
         glActiveTexture(GL_TEXTURE0)
         glBindTexture(GL_TEXTURE_2D, self.texture)
@@ -395,7 +401,7 @@ class SphericalBody(Body):
     def _draw_star(self):
         shader = self.world.activate_shader('star')
         shader.uniform_float('u_radius', self.radius)
-        shader.uniform_mat4('u_mvpMatrix', self.world.vp_matrix * self.model_matrix)
+        shader.uniform_mat4('u_mvpMatrix', self.mvp_matrix)
 
         glActiveTexture(GL_TEXTURE0)
         glBindTexture(GL_TEXTURE_2D, self.texture)
@@ -436,17 +442,30 @@ class SphericalBody(Body):
             self.atmosphere.draw()
 
     def _draw_clouds(self):
-        with glRestore(GL_ENABLE_BIT | GL_TEXTURE_BIT):
-            glLoadMatrixf(self.mv_matrix)
-            glEnable(GL_BLEND)
-            glEnable(GL_ALPHA_TEST)
-            glEnable(GL_CULL_FACE)
-            glDisable(GL_LIGHTING)
-            glEnable(GL_TEXTURE_2D)
+        glEnable(GL_BLEND)
+        shader = self.world.activate_shader('clouds')
+        shader.uniform_float('u_radius', self.cloud_radius)
+        shader.uniform_mat4('u_modelMatrix', self.model_matrix)
+        shader.uniform_mat4('u_mvpMatrix', self.mvp_matrix)
 
-            glCullFace(GL_BACK)
-            glBindTexture(GL_TEXTURE_2D, self.cloud_texture)
-            self.clouds.draw()
+        glActiveTexture(GL_TEXTURE0)
+        glBindTexture(GL_TEXTURE_2D, self.cloud_transparency)
+        shader.uniform_texture('u_transparency', 0)
+        shader.uniform_vec3('u_diffuse', 1, 1, 1)
+        shader.uniform_vec3('u_ambient', 0.1, 0.1, 0.1)
+
+        glBindBuffer(GL_ARRAY_BUFFER, self.clouds.vbo)
+        shader.vertex_attribute('a_normal', self.clouds.direction_size, self.clouds.type, GL_FALSE,
+                                self.clouds.stride, self.clouds.direction_offset)
+        shader.vertex_attribute('a_uv', self.clouds.uv_size, self.clouds.type, GL_FALSE,
+                                self.clouds.stride, self.clouds.uv_offset)
+
+        glDrawArrays(GL_TRIANGLE_STRIP, 0, self.clouds.vertex_count)
+
+        shader.deactivate_attributes()
+        glBindBuffer(GL_ARRAY_BUFFER, 0)
+        self.world.activate_shader(None)
+        glDisable(GL_BLEND)
 
     def _draw_rings(self):
         with glRestore(GL_ENABLE_BIT | GL_TEXTURE_BIT):

punyverse/shader.py

@@ -1,4 +1,5 @@
 import os
+import sys
 from ctypes import pointer, byref, create_string_buffer, POINTER, cast
 
 from pyglet.gl import *
@@ -39,11 +40,15 @@ class Program(object):
         succeeded = GLint()
         log_length = GLint()
         glGetShaderiv(shader, GL_COMPILE_STATUS, byref(succeeded))
+        glGetShaderiv(shader, GL_INFO_LOG_LENGTH, byref(log_length))
+        buffer = create_string_buffer(log_length.value + 1)
+        glGetShaderInfoLog(shader, log_length.value, None, buffer)
+
         if not succeeded:
-            glGetShaderiv(shader, GL_INFO_LOG_LENGTH, byref(log_length))
-            buffer = create_string_buffer(log_length.value + 1)
-            glGetShaderInfoLog(shader, log_length.value, None, buffer)
-            raise CompileError(buffer.value)
+            raise CompileError(buffer.value.decode('utf-8'))
+        elif log_length.value:
+            print('Warning:', file=sys.stderr)
+            print(buffer.value.decode('utf-8'), file=sys.stderr)
 
     def __init__(self, vertex_file, fragment_file):
         with glShader(GL_VERTEX_SHADER) as vertex_shader, glShader(GL_FRAGMENT_SHADER) as fragment_shader:

punyverse/shaders/clouds.fragment.glsl

@@ -0,0 +1,19 @@
+#version 130
+
+in vec2 v_uv;
+in vec3 v_normal;
+in vec3 v_position;
+
+out vec4 o_fragColor;
+
+uniform vec3 u_ambient;
+uniform vec3 u_diffuse;
+uniform vec3 u_sun;
+uniform sampler2D u_transparency;
+
+void main() {
+    vec3 incident = normalize(u_sun - v_position);
+    vec3 diffuse = u_diffuse * clamp(dot(v_normal, incident) + 0.2, 0.0, 1.0);
+
+    o_fragColor = vec4(u_ambient + diffuse, texture(u_transparency, v_uv).r);
+}

punyverse/shaders/clouds.vertex.glsl

@@ -0,0 +1,20 @@
+#version 130
+
+in vec3 a_normal;
+in vec2 a_uv;
+
+out vec2 v_uv;
+out vec3 v_normal;
+out vec3 v_position;
+
+uniform float u_radius;
+uniform mat4 u_mvpMatrix;
+uniform mat4 u_modelMatrix;
+
+void main() {
+    vec3 position = u_radius * a_normal;
+    v_uv = a_uv;
+    v_normal = (u_modelMatrix * vec4(a_normal, 0)).xyz;
+    v_position = (u_modelMatrix * vec4(position, 1)).xyz;
+    gl_Position = u_mvpMatrix * vec4(position, 1);
+}

punyverse/shaders/planet.fragment.glsl

@@ -6,6 +6,8 @@ in vec3 v_position;
 in vec3 v_camDirection;
 in mat3 v_TBN;
 
+out vec4 o_fragColor;
+
 struct Surface {
     sampler2D diffuseMap;
     bool hasNormal;
@@ -49,5 +51,5 @@ void main() {
     emission *= u_planet.emission * (1 - min(diffuseIntensity * 2, 1));
     specular *= u_planet.specular * u_sun.specular * max(shininess, 0) * diffuseIntensity;
 
-    gl_FragColor = vec4((ambient + diffuse + emission + specular) * u_sun.intensity, 1);
+    o_fragColor = vec4((ambient + diffuse + emission + specular) * u_sun.intensity, 1);
 }

punyverse/shaders/sky.fragment.glsl

@@ -1,8 +1,9 @@
 #version 130
 
 in vec2 v_uv;
+out vec4 o_fragColor;
 uniform sampler2D u_skysphere;
 
 void main() {
-    gl_FragColor = vec4(texture(u_skysphere, v_uv).rgb, 1);
+    o_fragColor = vec4(texture(u_skysphere, v_uv).rgb, 1);
 }

punyverse/shaders/star.fragment.glsl

@@ -1,8 +1,9 @@
 #version 130
 
 in vec2 v_uv;
+out vec4 o_fragColor;
 uniform sampler2D u_emission;
 
 void main() {
-    gl_FragColor = vec4(texture(u_emission, v_uv).rgb, 1);
+    o_fragColor = vec4(texture(u_emission, v_uv).rgb, 1);
 }

punyverse/texture.py

@@ -1,6 +1,5 @@
 from __future__ import print_function
 
-import itertools
 import os.path
 import struct
 from ctypes import c_int, byref, c_uint
@@ -9,7 +8,7 @@ from io import BytesIO
 import six
 from pyglet import image
 from pyglet.gl import *
-from six.moves import zip, range
+from six.moves import range
 
 try:
     from ._glgeom import bgr_to_rgb, flip_vertical
@@ -229,21 +228,26 @@ def load_clouds(file):
 
     path, width, height, depth, mode, texture = load_image(file, path)
 
+    if depth != 1:
+        texture = texture[::depth]
+
     buffer = c_uint()
     glGenTextures(1, byref(buffer))
     id = buffer.value
 
-    pixels = bytearray(len(texture) * 4)
-    white = b'\xff'[0]
-    pixels[:] = itertools.chain.from_iterable(zip(itertools.repeat(white), itertools.repeat(white),
-                                                  itertools.repeat(white),
-                                                  itertools.islice(texture, 0, None, depth)))
-
     glBindTexture(GL_TEXTURE_2D, id)
 
+    if gl_info.have_version(3) or gl_info.have_extension('GL_ARB_framebuffer_object'):
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, width, height, 0, GL_RED, GL_UNSIGNED_BYTE, texture)
+        glGenerateMipmap(GL_TEXTURE_2D)
+    else:
+        gluBuild2DMipmaps(GL_TEXTURE_2D, 1, width, height, GL_RED, GL_UNSIGNED_BYTE, texture)
+
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
-    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, six.binary_type(pixels))
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR)
+
+    if gl_info.have_extension('GL_EXT_texture_filter_anisotropic'):
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, glGetInteger(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT))
 
     cache[path] = id
     return id

punyverse/world.py

@@ -20,6 +20,7 @@ class World(object):
     PROGRAMS = {
         'sky': ('sky.vertex.glsl', 'sky.fragment.glsl'),
         'planet': ('planet.vertex.glsl', 'planet.fragment.glsl'),
+        'clouds': ('clouds.vertex.glsl', 'clouds.fragment.glsl'),
         'star': ('star.vertex.glsl', 'star.fragment.glsl'),
     }
 
@@ -52,6 +53,9 @@ class World(object):
         shader.uniform_vec3('u_sun.specular', 0.5, 0.5, 0.5)
         shader.uniform_vec3('u_sun.position', 0, 0, 0)
         shader.uniform_float('u_sun.intensity', 1)
+
+        shader = self.activate_shader('clouds')
+        shader.uniform_vec3('u_sun', 0, 0, 0)
         self.activate_shader(None)
 
     def _load_programs(self):