the walk manifold is alive

[carveJwlIkooP6JGAAIwe30JlM.git] / water.h

diff --git a/water.h b/water.h
index 957f2021c3cfedc7b34513dd8b503ad027b31f96..81d709e47956e56e992110f2eb8c945c51ee601a 100644 (file)
--- a/water.h
+++ b/water.h
@@ -7,6 +7,7 @@
 #include "model.h"
 #include "render.h"
 #include "shaders/water.h"
+#include "scene.h"
 
 vg_tex2d tex_water_surf = { .path = "textures/water_surf.qoi" };
 
@@ -15,6 +16,10 @@ static struct
    GLuint fb, rgb, rb;
    glmesh mdl;
 
+   GLuint depthmap;
+   boxf depthbounds;
+   int depth_computed;
+
    float height;
 }
 wrender;
@@ -29,6 +34,64 @@ static void water_init(void)
    create_renderbuffer_std( &wrender.fb, &wrender.rgb, &wrender.rb );
 }
 
+static int ray_world( v3f pos, v3f dir, ray_hit *hit );
+static void water_compute_depth( boxf bounds )
+{
+#ifdef VG_RELEASE
+   int const kres = 512;
+#else
+   int const kres = 64;
+#endif
+
+   vg_info( "Computing depth map\n" );
+   u8 *img = malloc( kres*kres );
+
+   v3f volume;
+   v3_sub( bounds[1], bounds[0], volume );
+   box_copy( bounds, wrender.depthbounds );
+   
+   for( int y=0; y<kres; y++ )
+   {
+      for( int x=0; x<kres; x++ )
+      {
+         v3f pos = { x, 0, y };
+         v3_divs( pos, kres, pos );
+         v3_muladd( bounds[0], pos, volume, pos );
+         pos[1] = wrender.height;
+         
+         ray_hit hit;
+         hit.dist = INFINITY;
+         u8 *dst = &img[ y*kres+x ];
+
+         if( ray_world( pos, (v3f){0.0f,-1.0f,0.0f}, &hit ))
+         {
+            float h = wrender.height - hit.pos[1];
+            h *= 1.0f/15.0f;
+            h = vg_clampf( h, 0.0f, 1.0f );
+            *dst = (u8)(h*255.0f);
+         }
+         else
+            *dst = 0;
+      }
+   }
+
+   if( wrender.depth_computed )
+      glDeleteTextures( 1, &wrender.depthmap );
+
+   glGenTextures( 1, &wrender.depthmap );
+   glBindTexture( GL_TEXTURE_2D, wrender.depthmap );
+   glTexImage2D( GL_TEXTURE_2D, 0, GL_RED, kres, kres, 0, 
+         GL_RED, GL_UNSIGNED_BYTE, img );
+
+   vg_tex2d_mipmap();
+   vg_tex2d_linear_mipmap();
+   vg_tex2d_clamp();
+
+   wrender.depth_computed = 1;
+   free( img );
+   vg_success( "Done.\n" );
+}
+
 static void water_set_surface( glmesh *surf, float height )
 {
    wrender.mdl = *surf;
@@ -100,6 +163,15 @@ static void render_water_surface( m4x4f pv )
          1.0f / (float)vg_window_x,
          1.0f / (float)vg_window_y });
 
+   glActiveTexture( GL_TEXTURE2 );
+   glBindTexture( GL_TEXTURE_2D, wrender.depthmap );
+   shader_water_uTexDepth( 2 );
+   shader_water_uDepthBounds( (v4f){ 
+         wrender.depthbounds[0][0],
+         wrender.depthbounds[0][2],
+         1.0f/ (wrender.depthbounds[1][0]-wrender.depthbounds[0][0]),
+         1.0f/ (wrender.depthbounds[1][2]-wrender.depthbounds[0][2])} );
+
    shader_water_uTime( vg_time );
    shader_water_uPv( pv );
 
@@ -109,8 +181,14 @@ static void render_water_surface( m4x4f pv )
 
    shader_water_uMdl( full );
 
+   glEnable(GL_BLEND);
+   glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
+   glBlendEquation(GL_FUNC_ADD);
+
    mesh_bind( &wrender.mdl );
    mesh_draw( &wrender.mdl );
+
+   glDisable(GL_BLEND);
 }
 
 #endif /* WATER_H */