shaders/terrain.h

   1 #ifndef SHADER_terrain_H
   2 #define SHADER_terrain_H
   3 static void shader_terrain_link(void);
   4 static void shader_terrain_register(void);
   5 static struct vg_shader _shader_terrain = {
   6    .name = "terrain",
   7    .link = shader_terrain_link,
   8    .vs =
   9 {
  10 .orig_file = "../shaders/terrain.vs",
  11 .static_src =
  12 "layout (location=0) in vec3 a_co;\n"
  13 "layout (location=1) in vec3 a_norm;\n"
  14 "layout (location=2) in vec4 a_colour;\n"
  15 "layout (location=3) in vec2 a_uv;\n"
  16 "\n"
  17 "#line      2        0 \n"
  18 "\n"
  19 "uniform mat4 uPv;\n"
  20 "uniform mat4x3 uMdl;\n"
  21 "\n"
  22 "out vec4 aColour;\n"
  23 "out vec2 aUv;\n"
  24 "out vec3 aNorm;\n"
  25 "out vec3 aCo;\n"
  26 "\n"
  27 "void main()\n"
  28 "{\n"
  29 "   gl_Position = uPv * vec4( uMdl * vec4(a_co,1.0), 1.0 );\n"
  30 "   aColour = a_colour;\n"
  31 "   aUv = a_uv;\n"
  32 "   aNorm = mat3(uMdl) * a_norm;\n"
  33 "   aCo = a_co;\n"
  34 "}\n"
  35 ""},
  36    .fs =
  37 {
  38 .orig_file = "../shaders/terrain.fs",
  39 .static_src =
  40 "out vec4 FragColor;\n"
  41 "\n"
  42 "uniform sampler2D uTexGarbage;\n"
  43 "uniform sampler2D uTexGradients;\n"
  44 "uniform vec3 uCamera;\n"
  45 "uniform vec4 uPlane;\n"
  46 "\n"
  47 "in vec4 aColour;\n"
  48 "in vec2 aUv;\n"
  49 "in vec3 aNorm;\n"
  50 "in vec3 aCo;\n"
  51 "\n"
  52 "float water_depth( vec3 pos, vec3 dir, vec4 plane )\n"
  53 "{\n"
  54 "   float d = dot( plane.xyz, dir );\n"
  55 "   float t = dot((plane.xyz*plane.w - pos),plane.xyz) / d;\n"
  56 "   return t*0.05;\n"
  57 "}\n"
  58 "\n"
  59 "void main()\n"
  60 "{\n"
  61 "   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );\n"
  62 "   \n"
  63 "   // Creating normal patches\n"
  64 "   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
  65 "   vec3 qnorm = normalize(floor(aNorm*4.0+modnorm) * 0.25);\n"
  66 "   vec2 dir = normalize(qnorm.xz);\n"
  67 "   vec2 uvdiffuse = aCo.xz * 0.02;\n"
  68 "   uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;\n"
  69 "   \n"
  70 "   // Patch local noise\n"
  71 "   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
  72 "\n"
  73 "   // Colour blending\n"
  74 "   float amtgrass = step(qnorm.y,0.6);\n"
  75 "   float amtsand = min(max((aCo.y + 90.0) * -0.08,0.0)*qnorm.y,1.0);\n"
  76 "   vec2 uvgradients = vec2( rgarbage.a, -amtgrass*0.125 ) + aUv;\n"
  77 "   vec3 diffuse = texture( uTexGradients, uvgradients ).rgb;\n"
  78 "   diffuse = mix( diffuse, vec3(1.0,0.9,0.7), amtsand );\n"
  79 "\n"
  80 "   // Lighting\n"
  81 "   vec3 lightdir = vec3(0.95,0.0,-0.3);\n"
  82 "   vec3 shadow = pow(vec3(0.014,0.034,0.084),vec3(1.0/3.2));\n"
  83 "   float light1 = dot( lightdir, mix(qnorm,aNorm,amtsand) )*0.5+0.5;\n"
  84 "   diffuse = diffuse * (light1*vec3(1.0,0.96,0.9)*1.2 + shadow*(1.0-light1));\n"
  85 "   \n"
  86 "   // Specular lighting\n"
  87 "   vec3 halfview = normalize( uCamera - aCo );\n"
  88 "   vec3 specdir = reflect( -lightdir, qnorm );\n"
  89 "   float spec = pow(max(dot(halfview,specdir),0.0),10.0) * 0.2*rgarbage.r;\n"
  90 "   diffuse += spec * vec3(1.0,0.8,0.8);\n"
  91 "\n"
  92 "   FragColor = vec4(diffuse, water_depth(aCo,halfview,uPlane));\n"
  93 "}\n"
  94 ""},
  95 };
  96
  97 static GLuint _uniform_terrain_uPv;
  98 static GLuint _uniform_terrain_uMdl;
  99 static GLuint _uniform_terrain_uTexGarbage;
 100 static GLuint _uniform_terrain_uTexGradients;
 101 static GLuint _uniform_terrain_uCamera;
 102 static GLuint _uniform_terrain_uPlane;
 103 static void shader_terrain_uPv(m4x4f m){
 104    glUniformMatrix4fv( _uniform_terrain_uPv, 1, GL_FALSE, (float *)m );
 105 }
 106 static void shader_terrain_uMdl(m4x3f m){
 107    glUniformMatrix4x3fv( _uniform_terrain_uMdl, 1, GL_FALSE, (float *)m );
 108 }
 109 static void shader_terrain_uTexGarbage(int i){
 110    glUniform1i( _uniform_terrain_uTexGarbage, i );
 111 }
 112 static void shader_terrain_uTexGradients(int i){
 113    glUniform1i( _uniform_terrain_uTexGradients, i );
 114 }
 115 static void shader_terrain_uCamera(v3f v){
 116    glUniform3fv( _uniform_terrain_uCamera, 1, v );
 117 }
 118 static void shader_terrain_uPlane(v4f v){
 119    glUniform4fv( _uniform_terrain_uPlane, 1, v );
 120 }
 121 static void shader_terrain_register(void){
 122    vg_shader_register( &_shader_terrain );
 123 }
 124 static void shader_terrain_use(void){ glUseProgram(_shader_terrain.id); }
 125 static void shader_terrain_link(void){
 126    _uniform_terrain_uPv = glGetUniformLocation( _shader_terrain.id, "uPv" );
 127    _uniform_terrain_uMdl = glGetUniformLocation( _shader_terrain.id, "uMdl" );
 128    _uniform_terrain_uTexGarbage = glGetUniformLocation( _shader_terrain.id, "uTexGarbage" );
 129    _uniform_terrain_uTexGradients = glGetUniformLocation( _shader_terrain.id, "uTexGradients" );
 130    _uniform_terrain_uCamera = glGetUniformLocation( _shader_terrain.id, "uCamera" );
 131    _uniform_terrain_uPlane = glGetUniformLocation( _shader_terrain.id, "uPlane" );
 132 }
 133 #endif /* SHADER_terrain_H */