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
= {
7 .link
= shader_terrain_link
,
10 .orig_file
= "../shaders/terrain.vs",
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"
20 "uniform mat4x3 uMdl;\n"
29 " gl_Position = uPv * vec4( uMdl * vec4(a_co,1.0), 1.0 );\n"
30 " aColour = a_colour;\n"
32 " aNorm = mat3(uMdl) * a_norm;\n"
38 .orig_file
= "../shaders/terrain.fs",
40 "out vec4 FragColor;\n"
42 "uniform sampler2D uTexGarbage;\n"
43 "uniform sampler2D uTexGradients;\n"
44 "uniform vec3 uCamera;\n"
53 " vec4 wgarbage = texture( uTexGarbage, aCo.xz * 0.015 );\n"
54 " vec3 modnorm = (wgarbage.rgb-0.4) * 1.4;\n"
55 " vec3 qnorm = floor(aNorm*4.0+modnorm) * 0.25;\n"
57 " vec2 dir = normalize(qnorm.xz);\n"
58 " vec2 uvdiffuse = aCo.xz * 0.02;\n"
59 " uvdiffuse = mat2(dir.y, dir.x, -dir.x, dir.y) * uvdiffuse;\n"
61 " vec4 rgarbage = texture( uTexGarbage, uvdiffuse );\n"
62 " float amtgrass = step(qnorm.y,0.6);\n"
63 " vec2 uvgradients = vec2( rgarbage.a, -amtgrass*0.125 ) + aUv;\n"
64 " vec3 diffuse = texture( uTexGradients, uvgradients ).rgb;\n"
66 " vec3 lightdir = vec3(0.95,0.0,-0.3);\n"
67 " vec3 shadow = pow(vec3(0.014,0.034,0.084),vec3(1.0/3.2));\n"
68 " float light1 = 1.0-(dot( lightdir, qnorm )*0.5+0.5);\n"
70 " qnorm = floor(aNorm*8.0)*0.125;\n"
71 " vec3 viewdelta = normalize( uCamera - aCo );\n"
72 " vec3 specdir = reflect( -lightdir, qnorm );\n"
73 " float spec = pow(max(dot(viewdelta,specdir),0.0),10.0) * 0.2*rgarbage.r;\n"
75 " diffuse = diffuse*(1.0-light1)+diffuse*shadow*light1;\n"
76 " FragColor = vec4(diffuse+spec, 1.0);\n"
81 static GLuint _uniform_terrain_uPv
;
82 static GLuint _uniform_terrain_uMdl
;
83 static GLuint _uniform_terrain_uTexGarbage
;
84 static GLuint _uniform_terrain_uTexGradients
;
85 static GLuint _uniform_terrain_uCamera
;
86 static void shader_terrain_uPv(m4x4f m
){
87 glUniformMatrix4fv( _uniform_terrain_uPv
, 1, GL_FALSE
, (float *)m
);
89 static void shader_terrain_uMdl(m4x3f m
){
90 glUniformMatrix4x3fv( _uniform_terrain_uMdl
, 1, GL_FALSE
, (float *)m
);
92 static void shader_terrain_uTexGarbage(int i
){
93 glUniform1i( _uniform_terrain_uTexGarbage
, i
);
95 static void shader_terrain_uTexGradients(int i
){
96 glUniform1i( _uniform_terrain_uTexGradients
, i
);
98 static void shader_terrain_uCamera(v3f v
){
99 glUniform3fv( _uniform_terrain_uCamera
, 1, v
);
101 static void shader_terrain_register(void){
102 vg_shader_register( &_shader_terrain
);
104 static void shader_terrain_use(void){ glUseProgram(_shader_terrain
.id
); }
105 static void shader_terrain_link(void){
106 _uniform_terrain_uPv
= glGetUniformLocation( _shader_terrain
.id
, "uPv" );
107 _uniform_terrain_uMdl
= glGetUniformLocation( _shader_terrain
.id
, "uMdl" );
108 _uniform_terrain_uTexGarbage
= glGetUniformLocation( _shader_terrain
.id
, "uTexGarbage" );
109 _uniform_terrain_uTexGradients
= glGetUniformLocation( _shader_terrain
.id
, "uTexGradients" );
110 _uniform_terrain_uCamera
= glGetUniformLocation( _shader_terrain
.id
, "uCamera" );
112 #endif /* SHADER_terrain_H */