comparison: src/gl/gridprogram.cpp
src/gl/gridprogram.cpp
- changeset 72
- 7c27cda03747
- parent 70
- f21b800b02a4
- child 90
- e234edb5e613
equal
deleted
inserted
replaced
| 71:198d25fe4e21 | 72:7c27cda03747 |
|---|---|
| 25 layout (location = 0) in vec2 in_position; | 25 layout (location = 0) in vec2 in_position; |
| 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(1000, 0, 0, 0), vec4(0, 1000, 0, 0), vec4(0, 0, 1000, 0), vec4(0, 0, 0, 1)); |
| 31 uniform mat4 grid; | 31 uniform mat4 grid; |
| 32 | 32 |
| 33 void main() | 33 void main() |
| 34 { | 34 { |
| 35 gl_Position = projection * view * model * grid * stretch * vec4(in_position, 0.0, 1.0); | 35 gl_Position = projection * view * model * grid * stretch * vec4(in_position, 0.0, 1.0); |
| 45 uniform vec4 gridColor; | 45 uniform vec4 gridColor; |
| 46 const float pi = 3.14159265f; | 46 const float pi = 3.14159265f; |
| 47 | 47 |
| 48 void main(void) | 48 void main(void) |
| 49 { | 49 { |
| 50 float dx = fract(ex_uv.y / 0.0001f); | 50 float dx = fract(ex_uv.y / 0.001f); |
| 51 float dy = fract(ex_uv.x / 0.0001f); | 51 float dy = fract(ex_uv.x / 0.001f); |
| 52 /* compute distance to nearest unit line */ | 52 /* compute distance to nearest unit line */ |
| 53 float d = min(min(min(dy, dx), 1 - dy), 1 - dx); | 53 float d = min(min(min(dy, dx), 1 - dy), 1 - dx); |
| 54 /* use an extreme sigmoid to bring out the grid shape */ | 54 /* use an extreme sigmoid to bring out the grid shape */ |
| 55 d = pow(1 - d, 50); | 55 d = pow(1 - d, 50); |
| 56 /* fade the grid towards extreme co-ordinates */ | 56 /* fade the grid towards extreme co-ordinates */ |
| 57 d = (1.0f - 20 * max(abs(ex_uv.x), abs(ex_uv.y))) * d; | 57 d = (1.0f - 20 * max(abs(ex_uv.x), abs(ex_uv.y))) * d; |
| 58 /* add dashes */ | 58 /* add dashes */ |
| 59 d *= (1 + cos(ex_uv.y / 0.00001f * pi)) * 0.5f; | 59 d *= (1 + cos(ex_uv.y / 0.0001f * pi)) * 0.5f; |
| 60 d *= (1 + cos(ex_uv.x / 0.00001f * pi)) * 0.5f; | 60 d *= (1 + cos(ex_uv.x / 0.0001f * pi)) * 0.5f; |
| 61 color = vec4(gridColor.xyz, gridColor.w * d); | 61 color = vec4(gridColor.xyz, gridColor.w * d); |
| 62 } | 62 } |
| 63 )"; | 63 )"; |
| 64 | 64 |
| 65 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}}; |
