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Use geometry shaders for icon and polygon thresholds, fix threshold method to map distance for placefile text

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This commit is contained in:
Dan Paulat 2023-08-18 00:42:55 -05:00
parent 69f93d6faf
commit 12833202b7
7 changed files with 174 additions and 100 deletions
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99
scwx-qt/source/scwx/qt/gl/draw/placefile_icons.cpp
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@ -1,4 +1,5 @@
#include <scwx/qt/gl/draw/placefile_icons.hpp>
#include <scwx/qt/util/maplibre.hpp>
#include <scwx/qt/util/texture_atlas.hpp>
#include <scwx/util/logger.hpp>
@ -84,6 +85,7 @@ public:
uMVPMatrixLocation_(GL_INVALID_INDEX),
uMapMatrixLocation_(GL_INVALID_INDEX),
uMapScreenCoordLocation_(GL_INVALID_INDEX),
uMapDistanceLocation_(GL_INVALID_INDEX),
vao_ {GL_INVALID_INDEX},
vbo_ {GL_INVALID_INDEX},
numVertices_ {0}
@ -95,6 +97,7 @@ public:
std::shared_ptr<GlContext> context_;
bool dirty_ {false};
bool thresholded_ {false};
boost::unordered_flat_map<std::size_t, const PlacefileIconInfo>
iconFiles_ {};
@ -105,9 +108,10 @@ public:
GLint uMVPMatrixLocation_;
GLint uMapMatrixLocation_;
GLint uMapScreenCoordLocation_;
GLint uMapDistanceLocation_;
GLuint vao_;
GLuint vbo_;
GLuint vao_;
std::array<GLuint, 2> vbo_;
GLsizei numVertices_;
@ -123,39 +127,32 @@ PlacefileIcons::~PlacefileIcons() = default;
PlacefileIcons::PlacefileIcons(PlacefileIcons&&) noexcept = default;
PlacefileIcons& PlacefileIcons::operator=(PlacefileIcons&&) noexcept = default;
void PlacefileIcons::set_thresholded(bool thresholded)
{
p->thresholded_ = thresholded;
}
void PlacefileIcons::Initialize()
{
gl::OpenGLFunctions& gl = p->context_->gl();
p->shaderProgram_ = p->context_->GetShaderProgram(":/gl/geo_texture2d.vert",
":/gl/texture2d.frag");
p->uMVPMatrixLocation_ =
gl.glGetUniformLocation(p->shaderProgram_->id(), "uMVPMatrix");
if (p->uMVPMatrixLocation_ == -1)
{
logger_->warn("Could not find uMVPMatrix");
}
p->uMapMatrixLocation_ =
gl.glGetUniformLocation(p->shaderProgram_->id(), "uMapMatrix");
if (p->uMapMatrixLocation_ == -1)
{
logger_->warn("Could not find uMapMatrix");
}
p->shaderProgram_ = p->context_->GetShaderProgram(
{{GL_VERTEX_SHADER, ":/gl/geo_texture2d.vert"},
{GL_GEOMETRY_SHADER, ":/gl/threshold.geom"},
{GL_FRAGMENT_SHADER, ":/gl/texture2d.frag"}});
p->uMVPMatrixLocation_ = p->shaderProgram_->GetUniformLocation("uMVPMatrix");
p->uMapMatrixLocation_ = p->shaderProgram_->GetUniformLocation("uMapMatrix");
p->uMapScreenCoordLocation_ =
gl.glGetUniformLocation(p->shaderProgram_->id(), "uMapScreenCoord");
if (p->uMapScreenCoordLocation_ == -1)
{
logger_->warn("Could not find uMapScreenCoord");
}
p->shaderProgram_->GetUniformLocation("uMapScreenCoord");
p->uMapDistanceLocation_ =
p->shaderProgram_->GetUniformLocation("uMapDistance");
gl.glGenVertexArrays(1, &p->vao_);
gl.glGenBuffers(1, &p->vbo_);
gl.glGenBuffers(2, p->vbo_.data());
gl.glBindVertexArray(p->vao_);
gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_);
gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_[0]);
gl.glBufferData(GL_ARRAY_BUFFER, 0u, nullptr, GL_DYNAMIC_DRAW);
// aLatLong
@ -203,6 +200,17 @@ void PlacefileIcons::Initialize()
reinterpret_cast<void*>(10 * sizeof(float)));
gl.glEnableVertexAttribArray(4);
gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_[1]);
gl.glBufferData(GL_ARRAY_BUFFER, 0u, nullptr, GL_DYNAMIC_DRAW);
// aThreshold
gl.glVertexAttribIPointer(5, //
1,
GL_INT,
0,
static_cast<void*>(0));
gl.glEnableVertexAttribArray(5);
p->dirty_ = true;
}
@ -214,7 +222,6 @@ void PlacefileIcons::Render(
gl::OpenGLFunctions& gl = p->context_->gl();
gl.glBindVertexArray(p->vao_);
gl.glBindBuffer(GL_ARRAY_BUFFER, p->vbo_);
p->Update();
p->shaderProgram_->Use();
@ -222,6 +229,21 @@ void PlacefileIcons::Render(
UseMapProjection(
params, p->uMapMatrixLocation_, p->uMapScreenCoordLocation_);
if (p->thresholded_)
{
// If thresholding is enabled, set the map distance
// TODO: nautical miles
auto mapDistance =
util::maplibre::GetMapDistance(params).value() / 1852.0f;
gl.glUniform1f(p->uMapDistanceLocation_,
static_cast<float>(mapDistance));
}
else
{
// If thresholding is disabled, set the map distance to 0
gl.glUniform1f(p->uMapDistanceLocation_, 0.0f);
}
// Don't interpolate texture coordinates
gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
gl.glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
@ -236,7 +258,7 @@ void PlacefileIcons::Deinitialize()
gl::OpenGLFunctions& gl = p->context_->gl();
gl.glDeleteVertexArrays(1, &p->vao_);
gl.glDeleteBuffers(1, &p->vbo_);
gl.glDeleteBuffers(2, p->vbo_.data());
}
void PlacefileIcons::SetIconFiles(
@ -279,8 +301,11 @@ void PlacefileIcons::Impl::Update()
if (dirty_)
{
static std::vector<float> buffer {};
static std::vector<GLint> thresholds {};
buffer.clear();
buffer.reserve(iconList_.size() * kBufferLength);
thresholds.clear();
thresholds.reserve(iconList_.size() * kVerticesPerRectangle);
numVertices_ = 0;
for (auto& di : iconList_)
@ -303,6 +328,10 @@ void PlacefileIcons::Impl::Update()
continue;
}
// TODO: nautical miles
GLint threshold =
static_cast<GLint>(std::roundf(di->threshold_.value() / 1852.0f));
// Latitude and longitude coordinates in degrees
const float lat = static_cast<float>(di->latitude_);
const float lon = static_cast<float>(di->longitude_);
@ -357,17 +386,33 @@ void PlacefileIcons::Impl::Update()
lat, lon, rx, ty, rs, tt, mc0, mc1, mc2, mc3, a, // TR
lat, lon, lx, ty, ls, tt, mc0, mc1, mc2, mc3, a // TL
});
thresholds.insert(thresholds.end(),
{threshold, //
threshold,
threshold,
threshold,
threshold,
threshold});
numVertices_ += 6;
}
gl::OpenGLFunctions& gl = context_->gl();
// Buffer vertex data
gl.glBindBuffer(GL_ARRAY_BUFFER, vbo_[0]);
gl.glBufferData(GL_ARRAY_BUFFER,
sizeof(float) * buffer.size(),
buffer.data(),
GL_DYNAMIC_DRAW);
// Buffer threshold data
gl.glBindBuffer(GL_ARRAY_BUFFER, vbo_[1]);
gl.glBufferData(GL_ARRAY_BUFFER,
sizeof(GLint) * thresholds.size(),
thresholds.data(),
GL_DYNAMIC_DRAW);
dirty_ = false;
}
}