shaders/planeinf.h

   1 #ifndef SHADER_planeinf_H
   2 #define SHADER_planeinf_H
   3 static void shader_planeinf_link(void);
   4 static void shader_planeinf_register(void);
   5 static struct vg_shader _shader_planeinf = {
   6    .name = "planeinf",
   7    .link = shader_planeinf_link,
   8    .vs =
   9 {
  10 .orig_file = "../shaders/standard.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 "out vec3 aWorldCo;\n"
  27 "\n"
  28 "void main()\n"
  29 "{\n"
  30 "   vec3 world_pos = uMdl * vec4(a_co,1.0);\n"
  31 "   gl_Position = uPv * vec4( world_pos, 1.0 );\n"
  32 "   aColour = a_colour;\n"
  33 "   aUv = a_uv;\n"
  34 "   aNorm = mat3(uMdl) * a_norm;\n"
  35 "   aCo = a_co;\n"
  36 "   aWorldCo = world_pos;\n"
  37 "}\n"
  38 ""},
  39    .fs =
  40 {
  41 .orig_file = "../shaders/planeinf.fs",
  42 .static_src =
  43 "\n"
  44 "#line      2        0 \n"
  45 "\n"
  46 "out vec4 FragColor;\n"
  47 "\n"
  48 "uniform vec3 uCamera;\n"
  49 "uniform vec4 uPlane;\n"
  50 "\n"
  51 "in vec4 aColour;\n"
  52 "in vec2 aUv;\n"
  53 "in vec3 aNorm;\n"
  54 "in vec3 aCo;\n"
  55 "\n"
  56 "float ray_plane( vec3 pos, vec3 dir, vec4 plane )\n"
  57 "{\n"
  58 "   float d = dot( plane.xyz, dir );\n"
  59 "   float t = dot((plane.xyz*plane.w - pos),plane.xyz) / d;\n"
  60 "   return t;\n"
  61 "}\n"
  62 "\n"
  63 "void main()\n"
  64 "{\n"
  65 "   float fdist = ray_plane( uCamera, -aNorm, uPlane );\n"
  66 "   vec3 world_pos = uCamera - aNorm*fdist;\n"
  67 "\n"
  68 "   FragColor = vec4(fract(world_pos*0.1),1.0);\n"
  69 "}\n"
  70 ""},
  71 };
  72
  73 static GLuint _uniform_planeinf_uPv;
  74 static GLuint _uniform_planeinf_uMdl;
  75 static GLuint _uniform_planeinf_uCamera;
  76 static GLuint _uniform_planeinf_uPlane;
  77 static void shader_planeinf_uPv(m4x4f m){
  78    glUniformMatrix4fv( _uniform_planeinf_uPv, 1, GL_FALSE, (float *)m );
  79 }
  80 static void shader_planeinf_uMdl(m4x3f m){
  81    glUniformMatrix4x3fv( _uniform_planeinf_uMdl, 1, GL_FALSE, (float *)m );
  82 }
  83 static void shader_planeinf_uCamera(v3f v){
  84    glUniform3fv( _uniform_planeinf_uCamera, 1, v );
  85 }
  86 static void shader_planeinf_uPlane(v4f v){
  87    glUniform4fv( _uniform_planeinf_uPlane, 1, v );
  88 }
  89 static void shader_planeinf_register(void){
  90    vg_shader_register( &_shader_planeinf );
  91 }
  92 static void shader_planeinf_use(void){ glUseProgram(_shader_planeinf.id); }
  93 static void shader_planeinf_link(void){
  94    _uniform_planeinf_uPv = glGetUniformLocation( _shader_planeinf.id, "uPv" );
  95    _uniform_planeinf_uMdl = glGetUniformLocation( _shader_planeinf.id, "uMdl" );
  96    _uniform_planeinf_uCamera = glGetUniformLocation( _shader_planeinf.id, "uCamera" );
  97    _uniform_planeinf_uPlane = glGetUniformLocation( _shader_planeinf.id, "uPlane" );
  98 }
  99 #endif /* SHADER_planeinf_H */