particle systems

[carveJwlIkooP6JGAAIwe30JlM.git] / shaders / particle.h

diff --git a/shaders/particle.h b/shaders/particle.h
new file mode 100644 (file)
index 0000000..60bc981
--- /dev/null
+++ b/shaders/particle.h
@@ -0,0 +1,108 @@
+#ifndef SHADER_particle_H
+#define SHADER_particle_H
+static void shader_particle_link(void);
+static void shader_particle_register(void);
+static struct vg_shader _shader_particle = {
+   .name = "particle",
+   .link = shader_particle_link,
+   .vs = 
+{
+.orig_file = "shaders/particle.vs",
+.static_src = 
+"layout (location=0) in vec3 a_co;\n"
+"layout (location=1) in vec4 a_colour;\n"
+"\n"
+"#line       1        1 \n"
+"const float k_motion_lerp_amount = 0.01;\n"
+"\n"
+"#line      2        0 \n"
+"\n"
+"out vec3 aMotionVec0;\n"
+"out vec3 aMotionVec1;\n"
+"\n"
+"void vs_motion_out( vec4 vproj0, vec4 vproj1 )\n"
+"{\n"
+"   // This magically solves some artifacting errors!\n"
+"   //\n"
+"   vproj1 = vproj0*(1.0-k_motion_lerp_amount) + vproj1*k_motion_lerp_amount;\n"
+"\n"
+"   aMotionVec0 = vec3( vproj0.xy, vproj0.w );\n"
+"   aMotionVec1 = vec3( vproj1.xy, vproj1.w );\n"
+"}\n"
+"\n"
+"#line      5        0 \n"
+"\n"
+"uniform mat4 uPv;\n"
+"uniform mat4 uPvPrev;\n"
+"\n"
+"out vec4 aColour;\n"
+"\n"
+"void main(){\n"
+"   vec4 vproj0     = uPv     * vec4( a_co, 1.0 );\n"
+"   vec4 vproj1     = uPvPrev * vec4( a_co, 1.0 );\n"
+"   vs_motion_out( vproj0, vproj1 );\n"
+"\n"
+"   gl_Position = vproj0;\n"
+"   aColour = a_colour;\n"
+"}\n"
+""},
+   .fs = 
+{
+.orig_file = "shaders/particle.fs",
+.static_src = 
+"layout (location = 0) out vec4 oColour;\n"
+"in vec4 aColour;\n"
+"\n"
+"#line       1        1 \n"
+"const float k_motion_lerp_amount = 0.01;\n"
+"\n"
+"#line      2        0 \n"
+"\n"
+"layout (location = 1) out vec2 oMotionVec;\n"
+"\n"
+"in vec3 aMotionVec0;\n"
+"in vec3 aMotionVec1;\n"
+"\n"
+"void compute_motion_vectors()\n"
+"{\n"
+"   // Write motion vectors\n"
+"   vec2 vmotion0 = aMotionVec0.xy / aMotionVec0.z;\n"
+"   vec2 vmotion1 = aMotionVec1.xy / aMotionVec1.z;\n"
+"\n"
+"   oMotionVec = (vmotion1-vmotion0) * (1.0/k_motion_lerp_amount);\n"
+"}\n"
+"\n"
+"#line      5        0 \n"
+"\n"
+"void main(){\n"
+"   compute_motion_vectors();\n"
+"\n"
+"   //vec2 ssuv = gl_FragCoord.xy;\n"
+"   //vec3 vDither = vec3( dot( vec2( 171.0, 231.0 ), ssuv) );\n"
+"   //float dither = fract( vDither.g / 71.0 ) - 0.5;\n"
+"\n"
+"   //if( vsamplemain.a+dither<0.5 )\n"
+"   //   discard;\n"
+"\n"
+"   oColour = aColour;\n"
+"}\n"
+""},
+};
+
+static GLuint _uniform_particle_uPv;
+static GLuint _uniform_particle_uPvPrev;
+static void shader_particle_uPv(m4x4f m){
+   glUniformMatrix4fv(_uniform_particle_uPv,1,GL_FALSE,(float*)m);
+}
+static void shader_particle_uPvPrev(m4x4f m){
+   glUniformMatrix4fv(_uniform_particle_uPvPrev,1,GL_FALSE,(float*)m);
+}
+static void shader_particle_register(void){
+   vg_shader_register( &_shader_particle );
+}
+static void shader_particle_use(void){ glUseProgram(_shader_particle.id); }
+static void shader_particle_link(void){
+   _uniform_particle_uPv = glGetUniformLocation( _shader_particle.id, "uPv" );
+   _uniform_particle_uPvPrev = glGetUniformLocation( _shader_particle.id, "uPvPrev" );
+}
+#endif /* SHADER_particle_H */