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Color radar image using a color table

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This commit is contained in:
Dan Paulat 2021-07-29 21:59:21 -05:00
parent f004c7aee0
commit c06230ed6c
6 changed files with 81 additions and 14 deletions
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30
scwx-qt/source/scwx/qt/map/radar_layer.cpp
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@ -36,6 +36,7 @@ public:
uMapScreenCoordLocation_(GL_INVALID_INDEX),
vbo_ {GL_INVALID_INDEX},
vao_ {GL_INVALID_INDEX},
texture_ {GL_INVALID_INDEX},
numVertices_ {0}
{
}
@ -49,6 +50,7 @@ public:
GLint uMapScreenCoordLocation_;
std::array<GLuint, 2> vbo_;
GLuint vao_;
GLuint texture_;
GLsizeiptr numVertices_;
};
@ -143,6 +145,11 @@ void RadarLayer::initialize()
gl.glEnableVertexAttribArray(1);
p->numVertices_ = vertices.size() / 2;
// Create color table
gl.glGenTextures(1, &p->texture_);
UpdateColorTable();
gl.glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
}
void RadarLayer::render(const QMapbox::CustomLayerRenderParameters& params)
@ -170,6 +177,8 @@ void RadarLayer::render(const QMapbox::CustomLayerRenderParameters& params)
gl.glUniformMatrix4fv(
p->uMVPMatrixLocation_, 1, GL_FALSE, glm::value_ptr(uMVPMatrix));
gl.glActiveTexture(GL_TEXTURE0);
gl.glBindTexture(GL_TEXTURE_1D, p->texture_);
gl.glBindVertexArray(p->vao_);
gl.glDrawArrays(GL_TRIANGLES, 0, p->numVertices_);
}
@ -186,6 +195,27 @@ void RadarLayer::deinitialize()
p->uMVPMatrixLocation_ = GL_INVALID_INDEX;
p->vao_ = GL_INVALID_INDEX;
p->vbo_ = {GL_INVALID_INDEX};
p->texture_ = GL_INVALID_INDEX;
}
void RadarLayer::UpdateColorTable()
{
OpenGLFunctions& gl = p->gl_;
const std::vector<boost::gil::rgba8_pixel_t>& colorTable =
p->radarView_->color_table();
gl.glActiveTexture(GL_TEXTURE0);
gl.glBindTexture(GL_TEXTURE_1D, p->texture_);
gl.glTexImage1D(GL_TEXTURE_1D,
0,
GL_RGBA,
(GLsizei) colorTable.size(),
0,
GL_RGBA,
GL_UNSIGNED_BYTE,
colorTable.data());
gl.glGenerateMipmap(GL_TEXTURE_1D);
}
static glm::vec2