pulsing grid

[vrfileman] / src / backdrop.cc

diff --git a/src/backdrop.cc b/src/backdrop.cc
index 91c709a..2a11c97 100644 (file)
--- a/src/backdrop.cc
+++ b/src/backdrop.cc
@@ -14,10 +14,12 @@ static Texture *tex_grid;
 static Mesh *mesh_skydome;
 static unsigned int sdr_skydome;
 
+static Vec3 grid_color;
+static int uloc_grid_color;
 
 bool init_backdrop()
 {
-       Vec3 grid_color = color(1.0, 0.07, 1.0);
+       grid_color = color(1.0, 0.07, 1.0);
        Vec3 mid_color = color(0.133, 0.006, 0.612);
        Vec3 horiz_color = color(0.612, 0.006, 1.0);
        Vec3 zenith_color = color(0.029, 0.029, 0.029);
@@ -26,6 +28,7 @@ bool init_backdrop()
        if(!(sdr_grid = create_program_load("sdr/grid.v.glsl", "sdr/grid.p.glsl"))) {
                return false;
        }
+       uloc_grid_color = get_uniform_loc(sdr_grid, "grid_color");
        set_uniform_float3(sdr_grid, "grid_color", grid_color.x, grid_color.y, grid_color.z);
        set_uniform_float3(sdr_grid, "fog_color", fog_color.x, fog_color.y, fog_color.z);
 
@@ -84,6 +87,8 @@ void draw_backdrop()
        glMultMatrixf(xform[0]);
 
        bind_program(sdr_grid);
+       float pulse = 1.0 + sin(time_sec * 3.0) * 0.25;
+       glUniform3f(uloc_grid_color, grid_color.x * pulse, grid_color.y * pulse, grid_color.z * pulse);
        bind_texture(tex_grid);
 
        glBegin(GL_QUADS);