Initial commit

client/common/shaders/bgfx_source/sky.sc

@@ -0,0 +1,35 @@
+$input a_position, a_texcoord0, a_color0
+$output v_texcoord0, v_color0
+
+#include "common.sh"
+
+uniform vec4 u_color;
+uniform vec4 u_color2;
+
+SAMPLER2D(s_diffuseMap, 0);
+
+void SkyVS()
+{
+    vec4 wpos = mul(u_worldMatrix, vec4(a_position, 1.0));
+
+    gl_Position = mul(u_viewProjection, wpos);
+
+#ifndef GLSLES
+    // snap to far plane to prevent scene-sky intersections
+    // small offset is needed to prevent 0/0 division in case w=0, which causes rasterization issues
+    // some mobile chips (hello, Vivante!) don't like it
+    gl_Position.z = gl_Position.w - 1.0 / 16.0;
+#endif
+
+#if BGFX_SHADER_LANGUAGE_GLSL
+    gl_PointSize = 2.0; // star size
+#endif
+
+    v_texcoord0 = a_texcoord0;
+    v_color0 = a_color0 * mix(u_color2, u_color, wpos.y / 1700.0);
+}
+
+void SkyPS()
+{
+    gl_FragColor = texture2D(s_diffuseMap, v_texcoord0) * v_color0;
+}