Add support for includes when loading shaders.

game/shader.py

@@ -19,29 +19,40 @@ from engine import load_shader
 
 #TODO: preprocessing (at least includes)
 
+def _cleanup(line):
+    return line.partition('//')[0].strip()
+
+def _filter(line):
+    return line
+
+def _subst(line):
+    if line.startswith('#include '):
+        path = Path('.') / 'game' / 'shaders'
+        lines = []
+        for name in line.split()[1:]:
+            lines.extend(_load_source(path / name.strip('"')))
+        return lines
+    return [line]
+
+def _load_source(_path):
+    assert _path.exists()
+    lines = filter(_filter, map(_cleanup, open(_path, 'rt')))
+    source = []
+    for line in lines:
+        source.extend(_subst(line))
+    return source
+
+def _convert(line):
+    return bytes(line, 'utf-8') + b'\n'
+
 def load(vert_name, frag_name = ''):
     path = Path('.') / 'game' / 'shaders'
     if not frag_name:
         frag_name = vert_name
-    def _cleanup(_line):
-        return _line.partition('//')[0].strip()
-    def _filter(_line):
-        return _line
-    def _convert(_line):
-        return bytes(_line, 'utf-8') + b'\n'
-    def load_source(_path):
-        if not _path.exists():
-            print("Cannot find", _path)
-            return None
-        return list(map(_convert, filter(_filter, map(_cleanup, open(_path, 'rt')))))
     print("Loading vertex shader", vert_name)
-    vert_lines = load_source(path / (vert_name + '_opengles.vert'))
-    if not vert_lines:
-        print("Error: Vertex shader is empty.")
-        return None
+    vert_lines = list(map(_convert, _load_source(path / (vert_name + '_opengles.vert'))))
+    assert vert_lines
     print("Loading fragment shader", frag_name)
-    frag_lines = load_source(path / (frag_name + '_opengles.frag'))
-    if not frag_lines:
-        print("Error: Fragment shader is empty.")
-        return None
+    frag_lines = list(map(_convert, _load_source(path / (frag_name + '_opengles.frag'))))
+    assert frag_lines
     return load_shader(vert_lines, frag_lines)

game/shaders/common_opengles.frag

@@ -16,6 +16,8 @@
 #version 320 es
 precision highp float;
 
+#include "include/environment.glsl"
+
 in vec4 v_position; // view space
 in vec4 v_normal; // view space
 in vec4 v_terrain_normal; // view space (x, y, z, weight)
@@ -23,9 +25,6 @@ in vec4 v_texcoord; // texture space (s, t, pixel_level, material_level)
 
 #define v_weight v_terrain_normal.w
 
-uniform vec3 u_light_direction; // view space (-direction_x, -direction_y, -direction_z)
-uniform vec3 u_light_color; // (color.r * power, color.g * power, color.b * power)
-
 layout(binding=0) uniform highp sampler2DArray u_texture_sampler;
 
 layout(location = 0) out vec4 o_color;

game/shaders/include/camera.glsl

@@ -0,0 +1,7 @@
+#ifndef CAMERA_INCLUDED
+#define CAMERA_INCLUDED
+
+uniform mat4 u_view; // world space -> view space
+uniform mat4 u_projection; // view space -> screen space
+
+#endif // CAMERA_INCLUDED

game/shaders/include/common.glsl

@@ -0,0 +1,20 @@
+#ifndef COMMON_INCLUDED
+#define COMMON_INCLUDED
+
+layout(binding=1) uniform highp sampler2D u_height_sampler;
+layout(binding=2) uniform highp sampler2D u_normal_sampler;
+
+const vec3 c_normal_scale = vec3(2.0, 2.0, 1.0);
+const vec3 c_normal_shift = vec3(-1.0, -1.0, 0.0);
+const vec2 c_st_scale = vec2(1.0 / 1023.0, 1.0 / 1023.0);
+const vec2 c_terrain_scale = vec2(1.0 / 2048.0, -1.0 / 2048.0);
+const vec2 c_terrain_shift = vec2(0.5, 0.5);
+const float c_weight_scale = 1.0 / 64.f;
+const vec3 c_world_forward = vec3(0.0, 1.0, 0.0);
+
+out vec4 v_position; // view space
+out vec4 v_normal; // view space
+out vec4 v_terrain_normal; // view space (x, y, z, weigth)
+out vec4 v_texcoord; // texture space (s, t, pixel_level, material_level)
+
+#endif // COMMON_INCLUDED

game/shaders/include/environment.glsl

@@ -0,0 +1,10 @@
+#ifndef ENVIRONMENT_INCLUDED
+#define ENVIRONMENT_INCLUDED
+
+uniform vec3 u_light_direction; // view space
+uniform vec3 u_light_color;
+uniform vec3 u_horizon_color;
+uniform vec3 u_sky_color;
+uniform vec3 u_sun_color;
+
+#endif // ENVIRONMENT_INCLUDED

game/shaders/include/vertex_format.glsl

@@ -0,0 +1,8 @@
+#ifndef VERTEX_FORMAT_INCLUDED
+#define VERTEX_FORMAT_INCLUDED
+
+layout(location = 0) in vec3 a_position; // model space
+layout(location = 1) in vec3 a_normal; // model space
+layout(location = 2) in vec3 a_texcoord; // texture space
+
+#endif // VERTEX_FORMAT_INCLUDED

game/shaders/sky_opengles.frag

@@ -16,14 +16,11 @@
 #version 320 es
 precision highp float;
 
+#include "include/camera.glsl"
+#include "include/environment.glsl"
+
 in vec3 v_position;
 
-uniform mat4 u_view; // world space -> view space, unit = km
-uniform vec3 u_light_direction; // view space (-direction_x, -direction_y, -direction_z)
-uniform vec3 u_light_color;
-uniform vec3 u_horizon_color;
-uniform vec3 u_sky_color;
-uniform vec3 u_sun_color;
 uniform float u_sea_phase;
 
 #define u_right u_view[0].xyz

game/shaders/sky_opengles.vert

@@ -16,9 +16,9 @@
 #version 320 es
 precision highp float;
 
-layout(location = 0) in vec3 a_position; // view space
+#include "include/camera.glsl"
 
-uniform mat4 u_projection; // view space -> screen space
+layout(location = 0) in vec3 a_position; // view space
 
 out vec3 v_position; // view space
 

game/shaders/terrain_opengles.vert

@@ -16,31 +16,12 @@
 #version 320 es
 precision highp float;
 
-layout(location = 0) in vec3 a_position; // model space
-layout(location = 1) in vec3 a_normal; // model space
-layout(location = 2) in vec3 a_texcoord; // texture space
+#include "include/vertex_format.glsl"
+#include "include/camera.glsl"
+#include "include/common.glsl"
 
 layout(location = 3) in vec3 i_translation; // per mesh, model space -> world space
 
-uniform mat4 u_view; // world space -> view space
-uniform mat4 u_projection; // view space -> screen space
-
-layout(binding=1) uniform highp sampler2D u_height_sampler;
-layout(binding=2) uniform highp sampler2D u_normal_sampler;
-
-const vec3 c_normal_scale = vec3(2.0, 2.0, 1.0);
-const vec3 c_normal_shift = vec3(-1.0, -1.0, 0.0);
-const vec2 c_st_scale = vec2(1.0 / 1023.0, 1.0 / 1023.0);
-const vec2 c_terrain_scale = vec2(1.0 / 2048.0, -1.0 / 2048.0);
-const vec2 c_terrain_shift = vec2(0.5, 0.5);
-const float c_weight_scale = 1.0 / 64.f;
-const vec3 c_world_forward = vec3(0.0, 1.0, 0.0);
-
-out vec4 v_position; // view space
-out vec4 v_normal; // view space
-out vec4 v_terrain_normal; // view space (x, y, z, weigth)
-out vec4 v_texcoord; // texture space (s, t, pixel_level, material_level)
-
 void main(void) {
     vec4 world_position = vec4(i_translation + a_position, 1.0);
     vec2 terrain_coords = c_terrain_shift + world_position.xy * c_terrain_scale;

game/shaders/tests_opengles.vert

@@ -16,32 +16,13 @@
 #version 320 es
 precision highp float;
 
-layout(location = 0) in vec3 a_position; // model space
-layout(location = 1) in vec3 a_normal; // model space
-layout(location = 2) in vec3 a_texcoord; // texture space
+#include "include/vertex_format.glsl"
+#include "include/camera.glsl"
+#include "include/common.glsl"
 
 layout(location = 3) in vec3 i_translation; // per mesh, model space -> world space
 layout(location = 4) in mat3 i_orientation; // per mesh, model space -> world space
 
-uniform mat4 u_view; // world space -> view space
-uniform mat4 u_projection; // view space -> screen space
-
-layout(binding=1) uniform highp sampler2D u_height_sampler;
-layout(binding=2) uniform highp sampler2D u_normal_sampler;
-
-const vec3 c_normal_scale = vec3(2.0, 2.0, 1.0);
-const vec3 c_normal_shift = vec3(-1.0, -1.0, 0.0);
-const vec2 c_st_scale = vec2(1.0 / 1023.0, 1.0 / 1023.0);
-const vec2 c_terrain_scale = vec2(1.0 / 2048.0, -1.0 / 2048.0);
-const vec2 c_terrain_shift = vec2(0.5, 0.5);
-const float c_weight_scale = 1.0 / 64.f;
-const vec3 c_world_forward = vec3(0.0, 1.0, 0.0);
-
-out vec4 v_position; // view space
-out vec4 v_normal; // view space
-out vec4 v_terrain_normal; // view space (x, y, z, weigth)
-out vec4 v_texcoord; // texture space (s, t, pixel_level, material_level)
-
 void main(void) {
     vec4 world_position = vec4(i_translation + i_orientation * a_position, 1.0);
     float weight = max(0.0, 1.0 - world_position.z * c_weight_scale);