91 lines
2.3 KiB
C++
91 lines
2.3 KiB
C++
#ifndef MBGL_UTIL_GL_HELPER
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#define MBGL_UTIL_GL_HELPER
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#include <mbgl/platform/gl.hpp>
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#include <array>
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namespace {
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template <typename T, T (*Create)(), void (*Destroy)(const T&)>
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class Preserve {
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public:
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Preserve() : data(Create()) {}
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~Preserve() { Destroy(data); }
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private:
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const T data;
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};
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inline bool getBlend() {
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return glIsEnabled(GL_BLEND);
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}
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inline void setBlend(const bool& enabled) {
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enabled ? MBGL_CHECK_ERROR(glEnable(GL_BLEND)) : MBGL_CHECK_ERROR(glDisable(GL_BLEND));
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}
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inline std::array<float, 4> getClearColor() {
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std::array<float, 4> color;
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MBGL_CHECK_ERROR(glGetFloatv(GL_COLOR_CLEAR_VALUE, color.data()));
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return color;
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}
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inline void setClearColor(const std::array<float, 4>& color) {
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MBGL_CHECK_ERROR(glClearColor(color[0], color[1], color[2], color[3]));
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}
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inline std::array<GLenum, 2> getBlendFunc() {
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GLint func[2];
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glGetIntegerv(GL_BLEND_SRC_ALPHA, &func[0]);
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glGetIntegerv(GL_BLEND_DST_ALPHA, &func[1]);
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return {{ static_cast<GLenum>(func[0]), static_cast<GLenum>(func[1]) }};
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}
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inline void setBlendFunc(const std::array<GLenum, 2>& func) {
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MBGL_CHECK_ERROR(glBlendFunc(func[0], func[1]));
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}
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#ifndef GL_ES_VERSION_2_0
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inline std::array<double, 2> getPixelZoom() {
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std::array<double, 2> zoom;
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glGetDoublev(GL_ZOOM_X, &zoom[0]);
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glGetDoublev(GL_ZOOM_Y, &zoom[1]);
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return zoom;
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}
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inline void setPixelZoom(const std::array<double, 2>& func) {
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MBGL_CHECK_ERROR(glPixelZoom(func[0], func[1]));
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}
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inline std::array<double, 4> getRasterPos() {
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std::array<double, 4> pos;
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MBGL_CHECK_ERROR(glGetDoublev(GL_CURRENT_RASTER_POSITION, pos.data()));
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return pos;
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}
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inline void setRasterPos(const std::array<double, 4>& pos) {
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MBGL_CHECK_ERROR(glRasterPos4d(pos[0], pos[1], pos[2], pos[3]));
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}
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#endif
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} // end anonymous namespace
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namespace mbgl {
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namespace gl {
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using PreserveBlend = Preserve<bool, getBlend, setBlend>;
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using PreserveClearColor = Preserve<std::array<float, 4>, getClearColor, setClearColor>;
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using PreserveBlendFunc = Preserve<std::array<GLenum, 2>, getBlendFunc, setBlendFunc>;
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#ifndef GL_ES_VERSION_2_0
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using PreservePixelZoom = Preserve<std::array<double, 2>, getPixelZoom, setPixelZoom>;
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using PreserveRasterPos = Preserve<std::array<double, 4>, getRasterPos, setRasterPos>;
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#endif
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}
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}
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#endif
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