shaders/button.h

   1 #ifndef SHADER_button_H
   2 #define SHADER_button_H
   3 static void shader_button_link(void);
   4 static void shader_button_register(void);
   5 static struct vg_shader _shader_button = {
   6    .name = "button",
   7    .link = shader_button_link,
   8    .vs =
   9 {
  10 .orig_file = "shaders/button.vs.glsl",
  11 .static_src =
  12 "layout (location=0) in vec2 a_co;\n"
  13 "uniform vec4 uOffset;  // Tile x/y, uv x/y\n"
  14 "uniform mat3 uPv;\n"
  15 "\n"
  16 "out vec2 aTexCoords;\n"
  17 "\n"
  18 "void main(){\n"
  19 "       // Vertex transform\n"
  20 "       vec3 worldpos = vec3( a_co + uOffset.xy, 1.0 );\n"
  21 "       gl_Position = vec4( uPv * worldpos, 1.0 );\n"
  22 "\n"
  23 "       // Create texture coords\n"
  24 "       vec2 edge_safe_coords = a_co * 0.98 + 0.01;\n"
  25 "       aTexCoords = (edge_safe_coords + uOffset.zw) * 0.25;    \n"
  26 "}\n"
  27 ""},
  28    .fs =
  29 {
  30 .orig_file = "shaders/button.fs.glsl",
  31 .static_src =
  32 "out vec4 FragColor;\n"
  33 "\n"
  34 "uniform sampler2D uTexMain;\n"
  35 "uniform vec4 uColour; // rgb, light amount\n"
  36 "\n"
  37 "in vec2 aTexCoords;\n"
  38 "\n"
  39 "void main(){\n"
  40 "       vec4 glyph = texture( uTexMain, aTexCoords.xy );\n"
  41 "       \n"
  42 "       FragColor = vec4( uColour.rgb * \n"
  43 "                     (mix(glyph.r,glyph.g,uColour.a)+0.02)*2.6 + glyph.b * 0.4, \n"
  44 "                     glyph.a );\n"
  45 "}\n"
  46 ""},
  47 };
  48
  49 static GLuint _uniform_button_uOffset;
  50 static GLuint _uniform_button_uPv;
  51 static GLuint _uniform_button_uTexMain;
  52 static GLuint _uniform_button_uColour;
  53 static void shader_button_uOffset(v4f const v){
  54    glUniform4fv(_uniform_button_uOffset,1,v);
  55 }
  56 static void shader_button_uPv(m3x3f m){
  57    glUniformMatrix3fv(_uniform_button_uPv,1,GL_FALSE,(float*)m);
  58 }
  59 static void shader_button_uTexMain(int i){
  60    glUniform1i(_uniform_button_uTexMain,i);
  61 }
  62 static void shader_button_uColour(v4f const v){
  63    glUniform4fv(_uniform_button_uColour,1,v);
  64 }
  65 static void shader_button_register(void){
  66    vg_shader_register( &_shader_button );
  67 }
  68 static void shader_button_use(void){ glUseProgram(_shader_button.id); }
  69 static void shader_button_link(void){
  70    _uniform_button_uOffset = glGetUniformLocation( _shader_button.id, "uOffset" );
  71    _uniform_button_uPv = glGetUniformLocation( _shader_button.id, "uPv" );
  72    _uniform_button_uTexMain = glGetUniformLocation( _shader_button.id, "uTexMain" );
  73    _uniform_button_uColour = glGetUniformLocation( _shader_button.id, "uColour" );
  74 }
  75 #endif /* SHADER_button_H */