comparison: src/gl/gridprogram.cpp
src/gl/gridprogram.cpp
- changeset 156
- 65b75beed7e0
- parent 155
- 13713fadbf14
- child 167
- c1ff4f107569
equal
deleted
inserted
replaced
| 155:13713fadbf14 | 156:65b75beed7e0 |
|---|---|
| 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(1000, 0, 0, 0), vec4(0, 1000, 0, 0), vec4(0, 0, 1000, 0), vec4(0, 0, 0, 1)); | |
| 31 uniform mat4 grid; | 30 uniform mat4 grid; |
| 32 | 31 |
| 33 void main() | 32 void main() |
| 34 { | 33 { |
| 35 gl_Position = projection * view * model * grid * stretch * vec4(in_position, 0.0, 1.0); | 34 gl_Position = projection * view * model * grid * vec4(in_position, 0.0, 1.0); |
| 36 ex_uv = in_position; | 35 ex_uv = in_position; |
| 37 } | 36 } |
| 38 )"; | 37 )"; |
| 39 | 38 |
| 40 const char fragmentShaderSource[] = R"( | 39 const char fragmentShaderSource[] = R"( |
| 41 #version 330 core | 40 #version 330 core |
| 42 | 41 |
| 43 out vec4 color; | 42 out vec4 color; |
| 44 smooth in vec2 ex_uv; | 43 smooth in vec2 ex_uv; |
| 45 uniform vec4 gridColor; | 44 uniform vec4 gridColor; |
| 46 const float pi = 3.14159265f; | |
| 47 | 45 |
| 48 void main(void) | 46 void main(void) |
| 49 { | 47 { |
| 50 float dx = fract(ex_uv.y / 0.001f); | 48 float dx = fract(ex_uv.y); |
| 51 float dy = fract(ex_uv.x / 0.001f); | 49 float dy = fract(ex_uv.x); |
| 52 /* compute distance to nearest unit line */ | |
| 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(1.02 - d, 100); | |
| 56 /* fade the grid towards extreme co-ordinates */ | 50 /* fade the grid towards extreme co-ordinates */ |
| 57 d = (1.0f - 20 * max(abs(ex_uv.x), abs(ex_uv.y))) * d; | 51 float d = (1.0f - 0.015 * max(abs(ex_uv.x), abs(ex_uv.y))); |
| 58 /* add dashes */ | |
| 59 d *= (1 + pow(cos((ex_uv.y / 0.0001f) * pi), 10)) * 0.5f; | |
| 60 d *= (1 + pow(cos((ex_uv.x / 0.0001f) * pi), 10)) * 0.5f; | |
| 61 color = vec4(gridColor.xyz, gridColor.w * d); | 52 color = vec4(gridColor.xyz, gridColor.w * d); |
| 62 } | 53 } |
| 63 )"; | 54 )"; |
| 64 | 55 |
| 65 static const glm::vec2 data[] = {{-1, -1}, {-1, 1}, {1, 1}, {1, -1}}; | 56 GridProgram::GridProgram(QObject *parent) : |
| 57 AbstractBasicShaderProgram{parent} | |
| 58 { | |
| 59 this->gridData.reserve(8004); | |
| 60 for (int i = -1000; i < 1000; i += 1) | |
| 61 { | |
| 62 this->gridData.push_back({i, -1000}); | |
| 63 this->gridData.push_back({i, 1000}); | |
| 64 } | |
| 65 for (int i = -1000; i < 1000; i += 1) | |
| 66 { | |
| 67 this->gridData.push_back({-1000, i}); | |
| 68 this->gridData.push_back({1000, i}); | |
| 69 } | |
| 70 } | |
| 66 | 71 |
| 67 void GridProgram::setGridMatrix(const glm::mat4& newGridMatrix) | 72 void GridProgram::setGridMatrix(const glm::mat4& newGridMatrix) |
| 68 { | 73 { |
| 69 this->setMatrix("grid", newGridMatrix); | 74 this->setMatrix("grid", newGridMatrix); |
| 70 } | 75 } |
| 95 return ::fragmentShaderSource; | 100 return ::fragmentShaderSource; |
| 96 } | 101 } |
| 97 | 102 |
| 98 const void* GridProgram::vertexData() const | 103 const void* GridProgram::vertexData() const |
| 99 { | 104 { |
| 100 return ::data; | 105 return this->gridData.data(); |
| 101 } | 106 } |
| 102 | 107 |
| 103 int GridProgram::vertexSize() const | 108 int GridProgram::vertexSize() const |
| 104 { | 109 { |
| 105 return sizeof data[0]; | 110 return sizeof this->gridData[0]; |
| 106 } | 111 } |
| 107 | 112 |
| 108 int GridProgram::vertexCount() const | 113 int GridProgram::vertexCount() const |
| 109 { | 114 { |
| 110 return glm::countof(data); | 115 return this->gridData.size(); |
| 111 } | 116 } |
| 112 | 117 |
| 113 void GridProgram::setupVertexArrays() | 118 void GridProgram::setupVertexArrays() |
| 114 { | 119 { |
| 115 this->program->enableAttributeArray(0); | 120 this->program->enableAttributeArray(0); |
| 117 this->program->setUniformVector("gridColor", this->gridColor); | 122 this->program->setUniformVector("gridColor", this->gridColor); |
| 118 } | 123 } |
| 119 | 124 |
| 120 GLenum GridProgram::drawMode() const | 125 GLenum GridProgram::drawMode() const |
| 121 { | 126 { |
| 122 return GL_QUADS; | 127 return GL_LINES; |
| 123 } | 128 } |
| 124 | 129 |
| 125 QOpenGLBuffer::UsagePattern GridProgram::usagePattern() const | 130 QOpenGLBuffer::UsagePattern GridProgram::usagePattern() const |
| 126 { | 131 { |
| 127 return QOpenGLBuffer::StaticDraw; | 132 return QOpenGLBuffer::StaticDraw; |
