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 "\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/planeinf.fs",
  39 .static_src =
  40 "\n"
  41 "#line      2        0 \n"
  42 "\n"
  43 "out vec4 FragColor;\n"
  44 "\n"
  45 "uniform vec3 uCamera;\n"
  46 "uniform vec4 uPlane;\n"
  47 "\n"
  48 "in vec4 aColour;\n"
  49 "in vec2 aUv;\n"
  50 "in vec3 aNorm;\n"
  51 "in vec3 aCo;\n"
  52 "\n"
  53 "float ray_plane( vec3 pos, vec3 dir, vec4 plane )\n"
  54 "{\n"
  55 "   float d = dot( plane.xyz, dir );\n"
  56 "   float t = dot((plane.xyz*plane.w - pos),plane.xyz) / d;\n"
  57 "   return t;\n"
  58 "}\n"
  59 "\n"
  60 "void main()\n"
  61 "{\n"
  62 "   float fdist = ray_plane( uCamera, -aNorm, uPlane );\n"
  63 "   vec3 world_pos = uCamera - aNorm*fdist;\n"
  64 "\n"
  65 "   FragColor = vec4(fract(world_pos*0.1),1.0);\n"
  66 "}\n"
  67 ""},
  68 };
  69
  70 static GLuint _uniform_planeinf_uPv;
  71 static GLuint _uniform_planeinf_uMdl;
  72 static GLuint _uniform_planeinf_uCamera;
  73 static GLuint _uniform_planeinf_uPlane;
  74 static void shader_planeinf_uPv(m4x4f m){
  75    glUniformMatrix4fv( _uniform_planeinf_uPv, 1, GL_FALSE, (float *)m );
  76 }
  77 static void shader_planeinf_uMdl(m4x3f m){
  78    glUniformMatrix4x3fv( _uniform_planeinf_uMdl, 1, GL_FALSE, (float *)m );
  79 }
  80 static void shader_planeinf_uCamera(v3f v){
  81    glUniform3fv( _uniform_planeinf_uCamera, 1, v );
  82 }
  83 static void shader_planeinf_uPlane(v4f v){
  84    glUniform4fv( _uniform_planeinf_uPlane, 1, v );
  85 }
  86 static void shader_planeinf_register(void){
  87    vg_shader_register( &_shader_planeinf );
  88 }
  89 static void shader_planeinf_use(void){ glUseProgram(_shader_planeinf.id); }
  90 static void shader_planeinf_link(void){
  91    _uniform_planeinf_uPv = glGetUniformLocation( _shader_planeinf.id, "uPv" );
  92    _uniform_planeinf_uMdl = glGetUniformLocation( _shader_planeinf.id, "uMdl" );
  93    _uniform_planeinf_uCamera = glGetUniformLocation( _shader_planeinf.id, "uCamera" );
  94    _uniform_planeinf_uPlane = glGetUniformLocation( _shader_planeinf.id, "uPlane" );
  95 }
  96 #endif /* SHADER_planeinf_H */