Converted ring to 1D texture.

punyverse/entity.py

@@ -8,7 +8,7 @@ from six.moves import range
 from punyverse.glgeom import compile, glRestore, belt, Disk, OrbitVBO, Matrix4f, SimpleSphere, TangentSphere, Cube
 from punyverse.model import load_model, WavefrontVBO
 from punyverse.orbit import KeplerOrbit
-from punyverse.texture import get_best_texture, load_clouds, get_cube_map
+from punyverse.texture import get_best_texture, load_clouds, get_cube_map, load_texture_1d
 from punyverse.utils import cached_property
 
 G = 6.67384e-11  # Gravitation Constant
@@ -343,7 +343,7 @@ class SphericalBody(Body):
             roll = world.evaluate(info['ring'].get('roll', roll))
             self.ring_rotation = pitch, yaw, roll
 
-            self.ring_texture = get_best_texture(info['ring'].get('texture', None), clamp=True)
+            self.ring_texture = load_texture_1d(info['ring'].get('texture'), clamp=True)
             self.ring = Disk(distance, distance + size, 30)
 
     def _draw_planet(self):
@@ -482,7 +482,7 @@ class SphericalBody(Body):
         shader.uniform_float('u_ambient', 0.1)
 
         glActiveTexture(GL_TEXTURE0)
-        glBindTexture(GL_TEXTURE_2D, self.ring_texture)
+        glBindTexture(GL_TEXTURE_1D, self.ring_texture)
         shader.uniform_texture('u_texture', 0)
 
         glBindBuffer(GL_ARRAY_BUFFER, self.ring.vbo)

punyverse/shaders/ring.fragment.glsl

@@ -9,13 +9,13 @@ uniform vec3 u_sun;
 uniform vec3 u_planet;
 uniform float u_planetRadius;
 uniform float u_ambient;
-uniform sampler2D u_texture;
+uniform sampler1D u_texture;
 
 void main() {
     vec3 incident = v_position - u_sun;
     vec3 plane_normal = u_planet - u_sun;
     vec3 plane_intersect = dot(plane_normal, plane_normal) / dot(incident, plane_normal) * incident;
-    o_fragColor = texture(u_texture, vec2(v_u, 0));
+    o_fragColor = texture(u_texture, v_u);
     if (length(plane_intersect) < length(incident) &&
         distance(plane_intersect, plane_normal) <= u_planetRadius)
             o_fragColor.rgb *= u_ambient;

punyverse/texture.py

@@ -186,6 +186,27 @@ def get_file_path(file):
     return path, file
 
 
+def create_texture():
+    buffer = GLuint()
+    glGenTextures(1, byref(buffer))
+    id = buffer.value
+    return id
+
+
+def delete_texture(id):
+    buffer = GLuint(id)
+    glDeleteTextures(1, byref(buffer))
+
+
+def get_internal_mode(mode):
+    return {
+        GL_RGB: GL_RGB8,
+        GL_BGR: GL_RGB8,
+        GL_RGBA: GL_RGBA8,
+        GL_BGRA: GL_RGBA8,
+    }[mode]
+
+
 def load_texture(file, clamp=False):
     path, file = get_file_path(file)
     if path in cache:
@@ -193,10 +214,7 @@ def load_texture(file, clamp=False):
 
     path, width, height, depth, mode, texture = load_image(file, path)
 
-    buffer = GLuint()
-    glGenTextures(1, byref(buffer))
-    id = buffer.value
-
+    id = create_texture()
     glBindTexture(GL_TEXTURE_2D, id)
 
     if gl_info.have_version(3) or gl_info.have_extension('GL_ARB_framebuffer_object'):
@@ -219,13 +237,26 @@ def load_texture(file, clamp=False):
     return id
 
 
-def get_internal_mode(mode):
-    return {
-        GL_RGB: GL_RGB8,
-        GL_BGR: GL_RGB8,
-        GL_RGBA: GL_RGBA8,
-        GL_BGRA: GL_RGBA8,
-    }[mode]
+def load_texture_1d(file, clamp=False):
+    path, file = get_file_path(file)
+    path, width, height, depth, mode, texture = load_image(file, path)
+
+    id = create_texture()
+    glBindTexture(GL_TEXTURE_1D, id)
+
+    if gl_info.have_version(3) or gl_info.have_extension('GL_ARB_framebuffer_object'):
+        glTexImage1D(GL_TEXTURE_1D, 0, get_internal_mode(mode), width, 0, mode, GL_UNSIGNED_BYTE, texture)
+        glGenerateMipmap(GL_TEXTURE_1D)
+    else:
+        gluBuild1DMipmaps(GL_TEXTURE_1D, depth, width, mode, GL_UNSIGNED_BYTE, texture)
+
+    if clamp:
+        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
+
+    if gl_info.have_extension('GL_EXT_texture_filter_anisotropic'):
+        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAX_ANISOTROPY_EXT, glGetInteger(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT))
+
+    return id
 
 
 def load_clouds(file):
@@ -264,9 +295,7 @@ def get_cube_map(files, callback=None):
     assert len(files) == 6
     callback = callback or (lambda index, file: None)
 
-    buffer = GLuint()
-    glGenTextures(1, byref(buffer))
-    id = buffer.value
+    id = create_texture()
 
     glBindTexture(GL_TEXTURE_CUBE_MAP, id)
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_BASE_LEVEL, 0)
@@ -284,7 +313,7 @@ def get_cube_map(files, callback=None):
             callback(index, file)
             path, width, height, depth, mode, texture = load_image(file, path)
         except Exception:
-            glDeleteTextures(1, byref(buffer))
+            delete_texture(id)
             raise
         glTexImage2D(part, 0, get_internal_mode(mode), width, height, 0, mode, GL_UNSIGNED_BYTE, texture)