X-Git-Url: https://harrygodden.com/git/?a=blobdiff_plain;f=water.h;h=bcd0c6847d44ca840d66b8694840bbe6fbad2351;hb=dfee9022b3513fddec36f7ea70867ee5961a44da;hp=94c7b34d0a332c782e58b581f46bca735367e9a7;hpb=1f1d636056450dcd23cce55c0795ec6276272531;p=carveJwlIkooP6JGAAIwe30JlM.git

diff --git a/water.h b/water.h
index 94c7b34..bcd0c68 100644
--- a/water.h
+++ b/water.h
@@ -1,50 +1,142 @@
+#include "common.h"
+#include "model.h"
+
+static void water_register(void);
+static void water_init(void);
+static void water_fb_resize(void);
+static void water_compute_depth( boxf bounds );
+static void water_set_surface( glmesh *surf, float height );
+static float water_height(void);
+
 #ifndef WATER_H
 #define WATER_H
 
-#define VG_3D
-#include "vg/vg.h"
-
-#include "model.h"
+#include "world.h"
 #include "render.h"
 #include "shaders/water.h"
+#include "scene.h"
 
 vg_tex2d tex_water_surf = { .path = "textures/water_surf.qoi" };
 
 static struct
 {
-   GLuint fb, rgb, rb;
+   struct framebuffer fbreflect, fbdepth;
    glmesh mdl;
 
+   GLuint depthmap;
+   boxf depthbounds;
+   int depth_computed;
+
    float height;
+   int enabled;
+}
+wrender =
+{
+   .fbreflect = { .format = GL_RGB,  .div = 2 },
+   .fbdepth   = { .format = GL_RGBA, .div = 2 }
+};
+
+static float water_height(void)
+{
+   return wrender.height;
 }
-wrender;
 
 static void water_register(void)
 {
    shader_water_register();
 }
 
-static void water_init( void (*newfb)(GLuint*,GLuint*,GLuint*))
+static void water_init(void)
 {
-   newfb( &wrender.fb, &wrender.rgb, &wrender.rb );
+   /* TODO: probably dont do this every time */
+   wrender.enabled = 1;
+   
+   fb_init( &wrender.fbreflect );
+   fb_init( &wrender.fbdepth );
 }
 
-static void water_set_surface( glmesh *surf, float height )
+static void water_fb_resize(void)
 {
-   wrender.mdl = *surf;
-   wrender.height = height;
+   if( !wrender.enabled )
+      return;
+   
+   fb_resize( &wrender.fbreflect );
+   fb_resize( &wrender.fbdepth );
+}
+
+static void water_compute_depth( boxf bounds )
+{
+   if( !wrender.enabled )
+      return;
+
+#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_fb_resize( void (*resize)(GLuint*,GLuint*,GLuint*) )
+static void water_set_surface( glmesh *surf, float height )
 {
-   resize( &wrender.fb, &wrender.rgb, &wrender.fb );
+   wrender.mdl = *surf;
+   wrender.height = height;
 }
 
 static void render_water_texture( m4x3f camera )
 {
+   if( !wrender.enabled )
+      return;
+
    /* Draw reflection buffa */
-   glBindFramebuffer( GL_FRAMEBUFFER, wrender.fb );
-   glClearColor( 0.11f, 0.35f, 0.37f, 1.0f );
+   fb_use( &wrender.fbreflect );
    glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 
    m4x3f new_cam, inverse;
@@ -81,17 +173,44 @@ static void render_water_texture( m4x3f camera )
    m4x4_mul( projection, view, projection );
 
    glCullFace( GL_FRONT );
-   render_world( projection );
+   render_world( projection, new_cam );
    glCullFace( GL_BACK );
+
+
+   /* Draw beneath texture */
+   fb_use( &wrender.fbdepth );
+   glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
+
+   m4x3_invert_affine( camera, inverse );
+   m4x3_expand( inverse, view );
+
+   v4f clippb = { 0.0f, -1.0f, 0.0f, -(wrender.height) };
+   m4x3_mulp( inverse, clippb, clippb );
+   clippb[3] *= -1.0f;
+   
+   float depth_loss = camera[3][1]-wrender.height;
+
+   m4x4_projection( projection,
+         gpipeline.fov,
+         (float)vg_window_x / (float)vg_window_y, 
+         0.1f, 900.0f );
+
+   plane_clip_projection( projection, clippb );
+   m4x4_mul( projection, view, projection );
+   render_world( projection, camera );
+   
+   glViewport( 0, 0, vg_window_x, vg_window_y );
 }
 
-static void render_water_surface( m4x4f pv )
+static void render_water_surface( m4x4f pv, m4x3f camera )
 {
+   if( !wrender.enabled )
+      return;
+
    /* Draw surface */
    shader_water_use();
    
-   glActiveTexture( GL_TEXTURE0 );
-   glBindTexture( GL_TEXTURE_2D, wrender.rgb );
+   fb_bindtex( &wrender.fbreflect, 0 );
    shader_water_uTexMain( 0 );
 
    vg_tex2d_bind( &tex_water_surf, 1 );
@@ -100,7 +219,22 @@ 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])} );
+
+   fb_bindtex( &wrender.fbdepth, 3 );
+   shader_water_uTexBack( 3 );
+
    shader_water_uTime( vg_time );
+   shader_water_uCamera( camera[3] );
+   shader_water_uSurfaceY( wrender.height );
+
    shader_water_uPv( pv );
 
    m4x3f full;
@@ -109,8 +243,14 @@ 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 */