Simulate and light the smoke on the GPU and make rain and snow of particles

shaders/particles_smoke.frag

@@ -0,0 +1,42 @@
+// the smoke of the gpu (opengl46_gpu_particles, particles_smoke.vert): the texture of the smoke in the colour the compute pass
+// lit the particle with, faded in front of the scene, fogged
+
+in vec4 f_color;
+in vec2 f_coord;
+in vec4 f_pos;
+in float f_soft;
+
+in vec4 f_clip_pos;
+in vec4 f_clip_future_pos;
+
+#texture (tex1, 0, sRGB_A)
+uniform sampler2D tex1;
+
+#include <common>
+#include <apply_fog.glsl>
+#include <tonemapping.glsl>
+#include <particle_soft.glsl>
+
+layout(location = 0) out vec4 out_color;
+#if MOTIONBLUR_ENABLED
+layout(location = 1) out vec4 out_motion;
+#endif
+
+void main()
+{
+	vec4 tex_color = texture(tex1, f_coord) * f_color;
+	tex_color.a *= particle_soft_fade(f_soft, -f_pos.z);
+#if POSTFX_ENABLED
+	out_color = vec4(apply_fog(tex_color.rgb), tex_color.a);
+#else
+	out_color = tonemap(vec4(apply_fog(tex_color.rgb), tex_color.a));
+#endif
+#if MOTIONBLUR_ENABLED
+	{
+		vec2 a = (f_clip_future_pos.xy / f_clip_future_pos.w) * 0.5 + 0.5;
+		vec2 b = (f_clip_pos.xy / f_clip_pos.w) * 0.5 + 0.5;
+
+		out_motion = vec4(a - b, 0.0f, tex_color.a * alpha_mult);
+	}
+#endif
+}