ImGui API
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package imgui;
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import java.nio.Buffer;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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/**
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* All draw data to render a Dear ImGui frame.
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* BINDING NOTICE: DO NOT TRY TO MODIFY FIELDS OF THIS CLASS MANUALLY! You should only access their values after {@link ImGui#Render()} call.
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*/
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public final class ImDrawData {
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public static int V_BUFFER_SIZE = (4 + 1) * 4;
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public static int I_BUFFER_SIZE = 2;
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public static int CMD_BUFFER_SIZE = (1 + 4 + 1) * 4;
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public ByteBuffer vByteBuffer;
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public ByteBuffer iByteBuffer;
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public ByteBuffer cmdByteBuffer;
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public int totalIdxCount; // For convenience, sum of all ImDrawList's IdxBuffer.Size
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public int totalVtxCount; // For convenience, sum of all ImDrawList's VtxBuffer.Size
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public int cmdListsCount; // Number of ImDrawList* to render
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// Upper-left position of the viewport to render (== upper-left of the orthogonal projection matrix to use)
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//
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public float displayPosX;
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public float displayPosY;
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// Size of the viewport to render (== io.DisplaySize for the main viewport)
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// (DisplayPos+DisplaySize == lower-right of the orthogonal projection matrix to use)
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//
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public float displaySizeX;
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public float displaySizeY;
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// Amount of pixels for each unit of DisplaySize. Based on io.DisplayFramebufferScale. Generally (1,1) on normal display, (2,2) on OSX with Retina display.
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//
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public float framebufferScaleX;
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public float framebufferScaleY;
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ImDrawData(int maxVertices, int maxIndices, int maxCmd) {
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vByteBuffer = ByteBuffer.allocateDirect(maxVertices * V_BUFFER_SIZE).order(ByteOrder.nativeOrder());
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iByteBuffer = ByteBuffer.allocateDirect(maxIndices * I_BUFFER_SIZE).order(ByteOrder.nativeOrder());
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cmdByteBuffer = ByteBuffer.allocateDirect(maxCmd * CMD_BUFFER_SIZE).order(ByteOrder.nativeOrder());
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}
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/*JNI
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#include <imgui.h>
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jfieldID totalVtxCountID;
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jfieldID totalIdxCountID;
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jfieldID CmdListsCountID;
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jfieldID displayPosXID;
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jfieldID displayPosYID;
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jfieldID displaySizeXID;
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jfieldID displaySizeYID;
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jfieldID framebufferScaleXID;
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jfieldID framebufferScaleYID;
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*/
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static native void nInit(); /*
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jclass jDrawDataClass = env->FindClass("imgui/ImDrawData");
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totalVtxCountID = env->GetFieldID(jDrawDataClass, "totalVtxCount", "I");
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totalIdxCountID = env->GetFieldID(jDrawDataClass, "totalIdxCount", "I");
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CmdListsCountID = env->GetFieldID(jDrawDataClass, "cmdListsCount", "I");
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displayPosXID = env->GetFieldID(jDrawDataClass, "displayPosX", "F");
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displayPosYID = env->GetFieldID(jDrawDataClass, "displayPosY", "F");
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displaySizeXID = env->GetFieldID(jDrawDataClass, "displaySizeX", "F");
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displaySizeYID = env->GetFieldID(jDrawDataClass, "displaySizeY", "F");
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framebufferScaleXID = env->GetFieldID(jDrawDataClass, "framebufferScaleX", "F");
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framebufferScaleYID = env->GetFieldID(jDrawDataClass, "framebufferScaleY", "F");
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*/
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native void nFillDrawData(Buffer indexBuffer, Buffer vertexBuffer, Buffer cmdBuffer); /*
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ImDrawData* drawData = ImGui::GetDrawData();
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if (drawData == NULL) {
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return;
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}
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int cmdListsCount = drawData->CmdListsCount;
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// Set values
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env->SetIntField(object, totalVtxCountID, drawData->TotalVtxCount);
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env->SetIntField(object, totalIdxCountID, drawData->TotalIdxCount);
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env->SetIntField(object, CmdListsCountID, cmdListsCount);
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env->SetFloatField(object, displayPosXID, drawData->DisplayPos.x);
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env->SetFloatField(object, displayPosYID, drawData->DisplayPos.y);
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env->SetFloatField(object, displaySizeXID, drawData->DisplaySize.x);
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env->SetFloatField(object, displaySizeYID, drawData->DisplaySize.y);
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env->SetFloatField(object, framebufferScaleXID, drawData->FramebufferScale.x);
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env->SetFloatField(object, framebufferScaleYID, drawData->FramebufferScale.y);
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ImDrawList** drawLists = drawData->CmdLists;
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int verticesOffset = 0;
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int indicesOffset = 0;
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int cmdOffset = 0;
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for(int i = 0; i < cmdListsCount; i++) {
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ImDrawList& drawList = *drawLists[i];
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ImVector<ImDrawCmd>& imDrawCmdList = drawList.CmdBuffer;
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ImVector<ImDrawIdx>& idxBuffer = drawList.IdxBuffer;
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ImVector<ImDrawVert>& vtxBuffer = drawList.VtxBuffer;
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float* vertexArrayDest = (float*)vertexBuffer;
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short* indexArrayDest = (short*)indexBuffer;
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int colorSize = 1;
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int verticesItemSize = (4 + colorSize);
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vertexArrayDest[verticesOffset++] = vtxBuffer.Size;
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// copy vertices to Destination buffer
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for(int j = 0; j < vtxBuffer.Size; j++) {
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ImDrawVert v = vtxBuffer[j];
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float posX = v.pos.x;
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float posY = v.pos.y;
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float uvX = v.uv.x;
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float uvY = v.uv.y;
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int byteIndex = (j * verticesItemSize) + verticesOffset;
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float color = 0;
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memcpy(&color, &v.col, 4); // move unsigned int color to float
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vertexArrayDest[byteIndex + 0] = posX;
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vertexArrayDest[byteIndex + 1] = posY;
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vertexArrayDest[byteIndex + 2] = uvX;
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vertexArrayDest[byteIndex + 3] = uvY;
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vertexArrayDest[byteIndex + 4] = color;
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}
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verticesOffset += vtxBuffer.Size * verticesItemSize;
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// copy index to destination buffer
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indexArrayDest[indicesOffset++] = idxBuffer.Size;
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for(int j = 0; j < idxBuffer.Size; j++) {
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indexArrayDest[j + indicesOffset] = idxBuffer[j];
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}
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indicesOffset += idxBuffer.Size;
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float* cmdArrayDest = (float*)cmdBuffer;
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cmdArrayDest[cmdOffset++] = imDrawCmdList.Size;
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int bytesOffset = 0;
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int imDrawCmdSize = 1 + 4 + 1;
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for (int cmd_i = 0; cmd_i < imDrawCmdList.Size; cmd_i++) {
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const ImDrawCmd* pcmd = &imDrawCmdList[cmd_i];
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float textureID = (float)(intptr_t)pcmd->TextureId;
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float tempArray [6] = {
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pcmd->ElemCount,
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pcmd->ClipRect.x, pcmd->ClipRect.y,
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pcmd->ClipRect.z, pcmd->ClipRect.w,
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textureID
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};
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memcpy((cmdArrayDest + (cmd_i * imDrawCmdSize) + cmdOffset), tempArray, imDrawCmdSize * 4);
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bytesOffset = bytesOffset + imDrawCmdSize;
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}
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cmdOffset += imDrawCmdList.Size * imDrawCmdSize;
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}
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*/
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}
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