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 "\n"
  45 "in vec4 aColour;\n"
  46 "in vec2 aUv;\n"
  47 "in vec3 aNorm;\n"
  48 "in vec3 aCo;\n"
  49 "\n"
  50 "void main()\n"
  51 "{\n"
  52 "   vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );\n"
  53 "   vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
  54 "   vec3 qnorm = floor(aNorm*4.0+modnorm) * 0.25;\n"
  55 "\n"
  56 "   vec2 dir = normalize(qnorm.xz);\n"
  57 "   vec2 uvdiffuse = aCo.xz * 0.02;\n"
  58 "   uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;\n"
  59 "\n"
  60 "   vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
  61 "   float amtgrass = step(qnorm.y,0.6);\n"
  62 "   vec2 uvgradients = vec2( rgarbage.a, -amtgrass*0.125 ) + aUv;\n"
  63 "   vec3 diffuse = texture( uTexGradients, uvgradients ).rgb;\n"
  64 "   \n"
  65 "   vec3 shadow = pow(vec3(0.014,0.034,0.084),vec3(1.0/3.2));\n"
  66 "   float light1 = 1.0-(dot( vec3(0.95,0.0,-0.3), qnorm )*0.5+0.5);\n"
  67 "\n"
  68 "   FragColor = vec4(diffuse*(1.0-light1)+diffuse*shadow*light1, 1.0);\n"
  69 "}\n"
  70 ""},
  71 };
  72
  73 static GLuint _uniform_terrain_uPv;
  74 static GLuint _uniform_terrain_uMdl;
  75 static GLuint _uniform_terrain_uTexGarbage;
  76 static GLuint _uniform_terrain_uTexGradients;
  77 static void shader_terrain_uPv(m4x4f m){
  78    glUniformMatrix4fv( _uniform_terrain_uPv, 1, GL_FALSE, (float *)m );
  79 }
  80 static void shader_terrain_uMdl(m4x3f m){
  81    glUniformMatrix4x3fv( _uniform_terrain_uMdl, 1, GL_FALSE, (float *)m );
  82 }
  83 static void shader_terrain_uTexGarbage(int i){
  84    glUniform1i( _uniform_terrain_uTexGarbage, i );
  85 }
  86 static void shader_terrain_uTexGradients(int i){
  87    glUniform1i( _uniform_terrain_uTexGradients, i );
  88 }
  89 static void shader_terrain_register(void){
  90    vg_shader_register( &_shader_terrain );
  91 }
  92 static void shader_terrain_use(void){ glUseProgram(_shader_terrain.id); }
  93 static void shader_terrain_link(void){
  94    _uniform_terrain_uPv = glGetUniformLocation( _shader_terrain.id, "uPv" );
  95    _uniform_terrain_uMdl = glGetUniformLocation( _shader_terrain.id, "uMdl" );
  96    _uniform_terrain_uTexGarbage = glGetUniformLocation( _shader_terrain.id, "uTexGarbage" );
  97    _uniform_terrain_uTexGradients = glGetUniformLocation( _shader_terrain.id, "uTexGradients" );
  98 }
  99 #endif /* SHADER_terrain_H */