1 files changed, 102 insertions, 0 deletions
diff --git a/src/mbgl/renderer/painter_debug.cpp b/src/mbgl/renderer/painter_debug.cpp
new file mode 100644
index 0000000000..c4d273aa47
--- /dev/null
+++ b/src/mbgl/renderer/painter_debug.cpp
@@ -0,0 +1,102 @@
+#include <mbgl/renderer/painter.hpp>
+#include <mbgl/renderer/debug_bucket.hpp>
+#include <mbgl/map/map.hpp>
+#include <mbgl/util/string.hpp>
+
+using namespace mbgl;
+
+void Painter::renderTileDebug(const Tile& tile) {
+    gl::group group(std::string { "debug " } + std::string(tile.id));
+    assert(tile.data);
+    if (debug) {
+        prepareTile(tile);
+        renderDebugText(tile.data->debugBucket, tile.matrix);
+        renderDebugFrame(tile.matrix);
+    }
+}
+
+void Painter::renderDebugText(DebugBucket& bucket, const mat4 &matrix) {
+    gl::group group("debug text");
+
+    glDisable(GL_DEPTH_TEST);
+
+    useProgram(plainShader->program);
+    plainShader->u_matrix = matrix;
+
+    // Draw white outline
+    plainShader->u_color = {{ 1.0f, 1.0f, 1.0f, 1.0f }};
+    lineWidth(4.0f * state.getPixelRatio());
+    bucket.drawLines(*plainShader);
+
+#ifndef GL_ES_VERSION_2_0
+    // Draw line "end caps"
+    glPointSize(2);
+    bucket.drawPoints(*plainShader);
+#endif
+
+    // Draw black text.
+    plainShader->u_color = {{ 0.0f, 0.0f, 0.0f, 1.0f }};
+    lineWidth(2.0f * state.getPixelRatio());
+    bucket.drawLines(*plainShader);
+
+    glEnable(GL_DEPTH_TEST);
+}
+
+void Painter::renderDebugFrame(const mat4 &matrix) {
+    gl::group group("debug frame");
+
+    // Disable depth test and don't count this towards the depth buffer,
+    // but *don't* disable stencil test, as we want to clip the red tile border
+    // to the tile viewport.
+    glDisable(GL_DEPTH_TEST);
+
+    useProgram(plainShader->program);
+    plainShader->u_matrix = matrix;
+
+    // draw tile outline
+    tileBorderArray.bind(*plainShader, tileBorderBuffer, BUFFER_OFFSET(0));
+    plainShader->u_color = {{ 1.0f, 0.0f, 0.0f, 1.0f }};
+    lineWidth(4.0f * state.getPixelRatio());
+    glDrawArrays(GL_LINE_STRIP, 0, (GLsizei)tileBorderBuffer.index());
+
+    glEnable(GL_DEPTH_TEST);
+}
+
+void Painter::renderDebugText(const std::vector<std::string> &strings) {
+    if (strings.empty()) {
+        return;
+    }
+
+    gl::group group("debug text");
+
+    glDisable(GL_DEPTH_TEST);
+    glStencilFunc(GL_ALWAYS, 0xFF, 0xFF);
+
+    useProgram(plainShader->program);
+    plainShader->u_matrix = nativeMatrix;
+
+    DebugFontBuffer debugFontBuffer;
+    int line = 25;
+    for (const std::string &str : strings) {
+        debugFontBuffer.addText(str.c_str(), 10, line, 0.75);
+        line += 20;
+    }
+
+    if (!debugFontBuffer.empty()) {
+        // draw debug info
+        VertexArrayObject debugFontArray;
+        debugFontArray.bind(*plainShader, debugFontBuffer, BUFFER_OFFSET(0));
+        plainShader->u_color = {{ 1.0f, 1.0f, 1.0f, 1.0f }};
+        lineWidth(4.0f * state.getPixelRatio());
+        glDrawArrays(GL_LINES, 0, (GLsizei)debugFontBuffer.index());
+    #ifndef GL_ES_VERSION_2_0
+        glPointSize(2);
+        glDrawArrays(GL_POINTS, 0, (GLsizei)debugFontBuffer.index());
+    #endif
+        plainShader->u_color = {{ 0.0f, 0.0f, 0.0f, 1.0f }};
+        lineWidth(2.0f * state.getPixelRatio());
+        glDrawArrays(GL_LINES, 0, (GLsizei)debugFontBuffer.index());
+    }
+
+    glEnable(GL_DEPTH_TEST);
+}