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Adding custom offset and scaling for color table to fragment shader

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This commit is contained in:
Dan Paulat 2021-11-13 01:50:44 -06:00
parent 3e92847901
commit aa48d8610a
6 changed files with 60 additions and 14 deletions
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35
scwx-qt/source/scwx/qt/map/radar_product_layer.cpp
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@ -53,6 +53,8 @@ public:
gl::ShaderProgram shaderProgram_;
GLint uMVPMatrixLocation_;
GLint uMapScreenCoordLocation_;
GLint uDataMomentOffsetLocation_;
GLint uDataMomentScaleLocation_;
std::array<GLuint, 2> vbo_;
GLuint vao_;
GLuint texture_;
@ -95,6 +97,24 @@ void RadarProductLayer::initialize()
<< logPrefix_ << "Could not find uMapScreenCoord";
}
p->uDataMomentOffsetLocation_ =
gl.glGetUniformLocation(p->shaderProgram_.id(), "uDataMomentOffset");
if (p->uDataMomentOffsetLocation_ == -1)
{
BOOST_LOG_TRIVIAL(warning)
<< logPrefix_ << "Could not find uDataMomentOffset";
}
p->uDataMomentScaleLocation_ =
gl.glGetUniformLocation(p->shaderProgram_.id(), "uDataMomentScale");
if (p->uDataMomentScaleLocation_ == -1)
{
BOOST_LOG_TRIVIAL(warning)
<< logPrefix_ << "Could not find uDataMomentScale";
}
p->shaderProgram_.Use();
// Generate a vertex array object
gl.glGenVertexArrays(1, &p->vao_);
@ -187,6 +207,8 @@ void RadarProductLayer::render(
{
gl::OpenGLFunctions& gl = p->gl_;
p->shaderProgram_.Use();
if (p->colorTableNeedsUpdate_)
{
UpdateColorTable();
@ -197,8 +219,6 @@ void RadarProductLayer::render(
UpdateSweep();
}
p->shaderProgram_.Use();
const float scale = std::pow(2.0, params.zoom) * 2.0f *
mbgl::util::tileSize / mbgl::util::DEGREES_MAX;
const float xScale = scale / params.width;
@ -252,12 +272,18 @@ void RadarProductLayer::UpdateColorTable()
{
BOOST_LOG_TRIVIAL(debug) << logPrefix_ << "UpdateColorTable()";
uint16_t rangeMin;
uint16_t rangeMax;
float scale;
p->colorTableNeedsUpdate_ = false;
gl::OpenGLFunctions& gl = p->gl_;
const std::vector<boost::gil::rgba8_pixel_t>& colorTable =
p->radarProductView_->color_table();
p->radarProductView_->color_table(rangeMin, rangeMax);
scale = rangeMax - rangeMin;
gl.glActiveTexture(GL_TEXTURE0);
gl.glBindTexture(GL_TEXTURE_1D, p->texture_);
@ -270,6 +296,9 @@ void RadarProductLayer::UpdateColorTable()
GL_UNSIGNED_BYTE,
colorTable.data());
gl.glGenerateMipmap(GL_TEXTURE_1D);
gl.glUniform1ui(p->uDataMomentOffsetLocation_, rangeMin);
gl.glUniform1f(p->uDataMomentScaleLocation_, rangeMax - rangeMin);
}
void RadarProductLayer::UpdateColorTableNextFrame()