comparison: src/gl/gridprogram.cpp
src/gl/gridprogram.cpp
- changeset 54
- a4055f67b9c7
- parent 53
- 3af627f7a40f
- child 55
- cb81ecb5fb23
equal
deleted
inserted
replaced
| 53:3af627f7a40f | 54:a4055f67b9c7 |
|---|---|
| 26 uniform mat4 view; | 26 uniform mat4 view; |
| 27 uniform mat4 projection; | 27 uniform mat4 projection; |
| 28 uniform mat4 model; | 28 uniform mat4 model; |
| 29 smooth out vec2 ex_uv; | 29 smooth out vec2 ex_uv; |
| 30 const mat4 stretch = mat4(vec4(10000, 0, 0, 0), vec4(0, 10000, 0, 0), vec4(0, 0, 10000, 0), vec4(0, 0, 0, 1)); | 30 const mat4 stretch = mat4(vec4(10000, 0, 0, 0), vec4(0, 10000, 0, 0), vec4(0, 0, 10000, 0), vec4(0, 0, 0, 1)); |
| 31 const mat4 gridmatrix = mat4(vec4(1, 0, 0, 0), vec4(0, 1, 0, 0), vec4(0, 0, 1, 0), vec4(0, 0, 0, 1)); | |
| 31 | 32 |
| 32 void main() | 33 void main() |
| 33 { | 34 { |
| 34 gl_Position = projection * view * model * stretch * vec4(in_position, 0.0, 1.0); | 35 gl_Position = projection * view * model * gridmatrix * stretch * vec4(in_position, 0.0, 1.0); |
| 35 ex_uv = in_position; | 36 ex_uv = in_position; |
| 36 } | 37 } |
| 37 )"; | 38 )"; |
| 38 | 39 |
| 39 const char fragmentShaderSource[] = R"( | 40 const char fragmentShaderSource[] = R"( |
| 40 #version 330 core | 41 #version 330 core |
| 41 | 42 |
| 42 out vec4 color; | 43 out vec4 color; |
| 43 smooth in vec2 ex_uv; | 44 smooth in vec2 ex_uv; |
| 44 const vec4 lineColor = vec4(1.0, 1.0, 1.0, 0.75); | 45 const vec4 lineColor = vec4(1.0, 1.0, 1.0, 0.75); |
| 46 const float pi = 3.14159265f; | |
| 45 | 47 |
| 46 void main(void) | 48 void main(void) |
| 47 { | 49 { |
| 48 if(fract(ex_uv.x / 0.001f) < 0.01f || fract(ex_uv.y / 0.001f) < 0.01f) | 50 float dx = fract(ex_uv.y / 0.0001f); |
| 49 color = lineColor; | 51 float dy = fract(ex_uv.x / 0.0001f); |
| 50 else | 52 /* compute distance to nearest unit line */ |
| 51 color = vec4(0); | 53 float d = min(min(min(dy, dx), 1 - dy), 1 - dx); |
| 54 /* use an extreme sigmoid to bring out the grid shape */ | |
| 55 d = pow(1 - d, 50); | |
| 56 /* fade the grid towards extreme co-ordinates */ | |
| 57 d = (1.0f - 20 * max(abs(ex_uv.x), abs(ex_uv.y))) * d; | |
| 58 /* add dashes */ | |
| 59 d *= (1 + cos(ex_uv.y / 0.00001f * pi)) * 0.5f; | |
| 60 d *= (1 + cos(ex_uv.x / 0.00001f * pi)) * 0.5f; | |
| 61 color = vec4(lineColor.xyz, d); | |
| 52 } | 62 } |
| 53 )"; | 63 )"; |
| 54 | 64 |
| 55 static const glm::vec2 data[] = {{-1, -1}, {-1, 1}, {1, 1}, {1, -1}}; | 65 static const glm::vec2 data[] = {{-1, -1}, {-1, 1}, {1, 1}, {1, -1}}; |
| 56 | 66 |
