shaders/ball.h

   1 #ifndef SHADER_ball_H
   2 #define SHADER_ball_H
   3 static void shader_ball_link(void);
   4 static void shader_ball_register(void);
   5 static struct vg_shader _shader_ball = {
   6    .name = "ball",
   7    .link = shader_ball_link,
   8    .vs =
   9 {
  10 .orig_file = "shaders/ball.vs.glsl",
  11 .static_src =
  12 "layout (location=0) in vec2 a_co;\n"
  13 "uniform vec3 uOffset;\n"
  14 "uniform mat3 uPv;\n"
  15 "\n"
  16 "out vec4 aTexCoords;\n"
  17 "\n"
  18 "void main(){\n"
  19 "  // Vertex transform\n"
  20 "  vec3 worldpos = vec3( (a_co * 0.5 - 0.25) * uOffset.z + uOffset.xy, 1.0 );\n"
  21 "  gl_Position = vec4( uPv * worldpos, 1.0 );\n"
  22 "\n"
  23 "  // Create texture coords\n"
  24 "  aTexCoords = vec4( a_co, worldpos.xy );\n"
  25 "}\n"
  26 ""},
  27    .fs =
  28 {
  29 .orig_file = "shaders/ball.fs.glsl",
  30 .static_src =
  31 "out vec4 FragColor;\n"
  32 "\n"
  33 "uniform sampler2D uTexMain;\n"
  34 "uniform vec3 uColour;\n"
  35 "uniform vec2 uTexOffset;\n"
  36 "\n"
  37 "in vec4 aTexCoords;\n"
  38 "\n"
  39 "void main(){\n"
  40 "       vec2 center_coords = aTexCoords.xy - 0.5;\n"
  41 "       vec2 center_coords_sqr = center_coords*center_coords;\n"
  42 "       float circle_factor = smoothstep( 0.07, 0.0625, \n"
  43 "                                     center_coords_sqr.x+center_coords_sqr.y );\n"
  44 "       \n"
  45 "       float bulge_amt = center_coords_sqr.x+center_coords_sqr.y;\n"
  46 "       vec2 warped_coords = aTexCoords.zw+uTexOffset - center_coords;\n"
  47 "       vec4 noise_sample = texture( uTexMain, warped_coords );\n"
  48 "       \n"
  49 "       float rim_light = (center_coords_sqr.x+center_coords_sqr.y)*15.0;\n"
  50 "       \n"
  51 "       vec2 shadow_coords = center_coords + vec2(0.02,0.07);\n"
  52 "       vec2 shadow_coords_sqr = shadow_coords*shadow_coords;\n"
  53 "       float shadow = exp(-((shadow_coords_sqr.x+shadow_coords_sqr.y)-0.0125)*15.0);\n"
  54 "       \n"
  55 "       vec3 marble_comp = uColour*0.6 + \n"
  56 "                        (noise_sample.x*2.7+pow(rim_light,3.0)*2.0) * 0.1;\n"
  57 "       vec4 colour_comp = mix( vec4(0.0,0.0,0.0,shadow), \n"
  58 "                           vec4(marble_comp,1.0), circle_factor );\n"
  59 "       FragColor = colour_comp;\n"
  60 "}\n"
  61 ""},
  62 };
  63
  64 static GLuint _uniform_ball_uOffset;
  65 static GLuint _uniform_ball_uPv;
  66 static GLuint _uniform_ball_uTexMain;
  67 static GLuint _uniform_ball_uColour;
  68 static GLuint _uniform_ball_uTexOffset;
  69 static void shader_ball_uOffset(v3f const v){
  70    glUniform3fv(_uniform_ball_uOffset,1,v);
  71 }
  72 static void shader_ball_uPv(m3x3f m){
  73    glUniformMatrix3fv(_uniform_ball_uPv,1,GL_FALSE,(float*)m);
  74 }
  75 static void shader_ball_uTexMain(int i){
  76    glUniform1i(_uniform_ball_uTexMain,i);
  77 }
  78 static void shader_ball_uColour(v3f const v){
  79    glUniform3fv(_uniform_ball_uColour,1,v);
  80 }
  81 static void shader_ball_uTexOffset(v2f const v){
  82    glUniform2fv(_uniform_ball_uTexOffset,1,v);
  83 }
  84 static void shader_ball_register(void){
  85    vg_shader_register( &_shader_ball );
  86 }
  87 static void shader_ball_use(void){ glUseProgram(_shader_ball.id); }
  88 static void shader_ball_link(void){
  89    _uniform_ball_uOffset = glGetUniformLocation( _shader_ball.id, "uOffset" );
  90    _uniform_ball_uPv = glGetUniformLocation( _shader_ball.id, "uPv" );
  91    _uniform_ball_uTexMain = glGetUniformLocation( _shader_ball.id, "uTexMain" );
  92    _uniform_ball_uColour = glGetUniformLocation( _shader_ball.id, "uColour" );
  93    _uniform_ball_uTexOffset = glGetUniformLocation( _shader_ball.id, "uTexOffset" );
  94 }
  95 #endif /* SHADER_ball_H */