Reactor ImGuiImplGl3

- Almost a 1:1 port of original C++ code
 - Fix for the OpenGL profiles >= 3.2

imgui-binding/src/main/java/imgui/ImDrawData.java

@@ -15,12 +15,12 @@ public final class ImDrawData implements ImDestroyable {
     public static final int SIZEOF_IM_DRAW_IDX = 2;
     public static final int SIZEOF_IM_DRAW_VERT = (4 + 1) * 4;
 
-    private static final int COUNT_FACTOR = 5_000;
+    private static final int FACTOR = 5_000;
 
     final long ptr;
 
-    private ByteBuffer idxBuffer = ByteBuffer.allocateDirect(SIZEOF_IM_DRAW_IDX * COUNT_FACTOR).order(ByteOrder.nativeOrder());
+    private ByteBuffer idxBuffer = ByteBuffer.allocateDirect(SIZEOF_IM_DRAW_IDX * FACTOR).order(ByteOrder.nativeOrder());
-    private ByteBuffer vtxBuffer = ByteBuffer.allocateDirect(SIZEOF_IM_DRAW_VERT * COUNT_FACTOR).order(ByteOrder.nativeOrder());
+    private ByteBuffer vtxBuffer = ByteBuffer.allocateDirect(SIZEOF_IM_DRAW_VERT * FACTOR).order(ByteOrder.nativeOrder());
 
     /**
      * This class will create a native structure.
@@ -121,7 +121,7 @@ public final class ImDrawData implements ImDestroyable {
     public ByteBuffer getCmdListIdxBufferData(final int cmdListIdx) {
         final int idxBufferCapacity = getCmdListIdxBufferSize(cmdListIdx) * SIZEOF_IM_DRAW_IDX;
         if (idxBuffer.capacity() < idxBufferCapacity) {
-            idxBuffer = ByteBuffer.allocateDirect(idxBufferCapacity + COUNT_FACTOR).order(ByteOrder.nativeOrder());
+            idxBuffer = ByteBuffer.allocateDirect(idxBufferCapacity + FACTOR).order(ByteOrder.nativeOrder());
         }
 
         nGetCmdListIdxBufferData(cmdListIdx, idxBuffer, idxBufferCapacity);
@@ -146,7 +146,7 @@ public final class ImDrawData implements ImDestroyable {
     public ByteBuffer getCmdListVtxBufferData(final int cmdListIdx) {
         final int vtxBufferCapacity = getCmdListVtxBufferSize(cmdListIdx) * SIZEOF_IM_DRAW_VERT;
         if (vtxBuffer.capacity() < vtxBufferCapacity) {
-            vtxBuffer = ByteBuffer.allocateDirect(vtxBufferCapacity + COUNT_FACTOR).order(ByteOrder.nativeOrder());
+            vtxBuffer = ByteBuffer.allocateDirect(vtxBufferCapacity + FACTOR).order(ByteOrder.nativeOrder());
         }
 
         nGetCmdListVtxBufferData(cmdListIdx, vtxBuffer, vtxBufferCapacity);

imgui-lwjgl3/src/main/java/imgui/gl3/ImGuiImplGl3.java

@@ -3,57 +3,60 @@ package imgui.gl3;
 import imgui.ImDrawData;
 import imgui.ImFontAtlas;
 import imgui.ImGui;
+import imgui.ImGuiIO;
 import imgui.ImInt;
 import imgui.ImVec2;
 import imgui.ImVec4;
+import imgui.enums.ImGuiBackendFlags;
 
-import java.io.BufferedReader;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
-import java.io.UncheckedIOException;
 import java.nio.ByteBuffer;
-import java.util.Objects;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import static org.lwjgl.opengl.GL32.*;
 
 /**
- * This class mostly a straightforward port of the
+ * This class is a straightforward port of the
- * <a href="https://raw.githubusercontent.com/ocornut/imgui/v1.74/examples/imgui_impl_opengl3.cpp">imgui_impl_opengl3.cpp</a>
+ * <a href="https://raw.githubusercontent.com/ocornut/imgui/v1.76/examples/imgui_impl_opengl3.cpp">imgui_impl_opengl3.cpp</a>.
- * adapted for Java and LWJGL realms.
  * <p>
- * It do support a backup of the current GL state before rendering and restoring of its initial state after.
+ * It do support a backup and restoring of the GL state in the same way the original Dear ImGui code does.
- * But some specific state variables may be missed (all which are hidden under '#ifdef' macros in the original 'imgui_impl_opengl3.cpp' file).
+ * Some of the very specific OpenGL variables may be ignored here,
+ * yet you can copy-paste this class in your codebase and modify the rendering routine in the way you'd like.
  * <p>
- * This implementation uses shaders with 130 version of GLSL (OpenGL 3.0).
+ * This implementation has an ability to use a GLSL version provided during the initialization.
+ * Please read the documentation for the {@link #init(String)}.
  */
 @SuppressWarnings("MagicNumber")
 public final class ImGuiImplGl3 {
-    private int vboHandle = 0;
+    // OpenGL Data
-    private int elementsHandle = 0;
+    private int glVersion = 0;
+    private String glslVersion = "";
+    private int gVboHandle = 0;
+    private int gElementsHandle = 0;
+    private int gShaderHandle = 0;
+    private int gFragHandle = 0;
+    private int gVertHandle = 0;
+    private int gAttribLocationTex = 0;
+    private int gAttribLocationProjMtx = 0;
+    private int gAttribLocationVtxPos = 0;
+    private int gAttribLocationVtxUV = 0;
+    private int gAttribLocationVtxColor = 0;
+    private int gFontTexture = 0;
+    private int gVertexArrayObjectHandle = 0;
 
     // Used to store tmp renderer data
     private final ImVec2 displaySize = new ImVec2();
     private final ImVec2 framebufferScale = new ImVec2();
     private final ImVec2 displayPos = new ImVec2();
     private final ImVec4 clipRect = new ImVec4();
+    private final float[] orthoProjMatrix = new float[4 * 4];
 
-    // Shader stuff
+    // Variables used to backup GL state before and after the rendering of Dear ImGui
-    private int programId = 0;
-    private int fragmentShaderId = 0;
-    private int vertexShaderId = 0;
-
-    // Texture used by fonts
-    private int gFontTexture = 0;
-
-    // Projection matrix for ImGui
-    private final float[] projMatrix = new float[4 * 4];
-
-    // Variables used to backup GL state before and after rendering of ImGui
     private final int[] lastActiveTexture = new int[1];
     private final int[] lastProgram = new int[1];
     private final int[] lastTexture = new int[1];
     private final int[] lastArrayBuffer = new int[1];
+    private final int[] lastVertexArrayObject = new int[1];
     private final int[] lastViewport = new int[4];
     private final int[] lastScissorBox = new int[4];
     private final int[] lastBlendSrcRgb = new int[1];
@@ -68,27 +71,65 @@ public final class ImGuiImplGl3 {
     private boolean lastEnableScissorTest = false;
 
     /**
-     * This method SHOULD be called before calling of {@link ImGuiImplGl3#render(ImDrawData)} method.
+     * Method to do an initialization of the {@link ImGuiImplGl3} state.
+     * It SHOULD be called before calling of the {@link ImGuiImplGl3#render(ImDrawData)} method.
+     * <p>
+     * Unlike in the {@link #init(String)} method, here the glslVersion argument is omitted.
+     * Thus a "#version 130" string will be used instead.
      */
     public void init() {
-        prepareShader();
+        init(null);
-        prepareFont();
-        vboHandle = glGenBuffers();
-        elementsHandle = glGenBuffers();
     }
 
     /**
-     * Method which renders {@link ImDrawData} from ImGui.
+     * Method to do an initialization of the {@link ImGuiImplGl3} state.
-     *
+     * It SHOULD be called before calling of the {@link ImGuiImplGl3#render(ImDrawData)} method.
-     * @param drawData data used to draw ImGui interface to your current OpenGL context
+     * <p>
+     * Method takes an argument, which should be a valid GLSL string with the version to use.
+     * <pre>
+     * ----------------------------------------
+     * OpenGL    GLSL      GLSL
+     * version   version   string
+     * ---------------------------------------
+     *  2.0       110       "#version 110"
+     *  2.1       120       "#version 120"
+     *  3.0       130       "#version 130"
+     *  3.1       140       "#version 140"
+     *  3.2       150       "#version 150"
+     *  3.3       330       "#version 330 core"
+     *  4.0       400       "#version 400 core"
+     *  4.1       410       "#version 410 core"
+     *  4.2       420       "#version 410 core"
+     *  4.3       430       "#version 430 core"
+     * ---------------------------------------
+     * </pre>
+     * <p>
+     * If the argument is null, then a "#version 130" string will be used by default.
+     */
+    public void init(final String glslVersion) {
+        readGlVersion();
+        setupBackendCapabilitiesFlags();
+
+        if (glslVersion == null) {
+            this.glslVersion = "#version 130";
+        } else {
+            this.glslVersion = glslVersion;
+        }
+
+        createDeviceObjects();
+    }
+
+    /**
+     * Method to render {@link ImDrawData} into current OpenGL context.
      */
     public void render(final ImDrawData drawData) {
         if (drawData.getCmdListsCount() <= 0) {
             return;
         }
 
-        drawData.getDisplaySize(displaySize);
+        // Will project scissor/clipping rectangles into framebuffer space
-        drawData.getFramebufferScale(framebufferScale);
+        drawData.getDisplaySize(displaySize);           // (0,0) unless using multi-viewports
+        drawData.getFramebufferScale(framebufferScale); // (1,1) unless using retina display which are often (2,2)
 
         // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
         final int fbWidth = (int) (displaySize.x * framebufferScale.x);
@@ -125,9 +166,16 @@ public final class ImGuiImplGl3 {
                     final int textureId = drawData.getCmdListCmdBufferTextureId(cmdListIdx, cmdBufferIdx);
                     final int elemCount = drawData.getCmdListCmdBufferElemCount(cmdListIdx, cmdBufferIdx);
                     final int idxBufferOffset = drawData.getCmdListCmdBufferIdxOffset(cmdListIdx, cmdBufferIdx);
+                    final int vtxBufferOffset = drawData.getCmdListCmdBufferVtxOffset(cmdListIdx, cmdBufferIdx);
+                    final int indices = idxBufferOffset * ImDrawData.SIZEOF_IM_DRAW_IDX;
 
                     glBindTexture(GL_TEXTURE_2D, textureId);
-                    glDrawElements(GL_TRIANGLES, elemCount, GL_UNSIGNED_SHORT, idxBufferOffset * ImDrawData.SIZEOF_IM_DRAW_IDX);
+
+                    if (glVersion >= 320) {
+                        glDrawElementsBaseVertex(GL_TRIANGLES, elemCount, GL_UNSIGNED_SHORT, indices, vtxBufferOffset);
+                    } else {
+                        glDrawElements(GL_TRIANGLES, elemCount, GL_UNSIGNED_SHORT, indices);
+                    }
                 }
             }
         }
@@ -137,36 +185,22 @@ public final class ImGuiImplGl3 {
     }
 
     /**
-     * Call this method in the end of your app working state to dispose resources.
+     * Call this method in the end of your application cycle to dispose resources used by {@link ImGuiImplGl3}.
      */
     public void dispose() {
+        glDeleteBuffers(gVboHandle);
+        glDeleteBuffers(gElementsHandle);
+        glDetachShader(gShaderHandle, gVertHandle);
+        glDetachShader(gShaderHandle, gFragHandle);
+        glDeleteProgram(gShaderHandle);
         glDeleteTextures(gFontTexture);
-        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
-        glDeleteBuffers(elementsHandle);
-        glDeleteBuffers(vboHandle);
-        glDetachShader(programId, vertexShaderId);
-        glDetachShader(programId, fragmentShaderId);
-        glDeleteProgram(programId);
     }
 
-    private void prepareShader() {
+    /**
-        final CharSequence fragShaderSource = readFromResources("default.frag");
+     * Method rebuilds the font atlas for Dear ImGui. Could be used to update application fonts in runtime.
-        final CharSequence vertShaderSource = readFromResources("default.vert");
+     */
-
+    public void updateFontsTexture() {
-        fragmentShaderId = loadAndCompileShader(GL_FRAGMENT_SHADER, fragShaderSource);
+        glDeleteTextures(gFontTexture);
-        vertexShaderId = loadAndCompileShader(GL_VERTEX_SHADER, vertShaderSource);
-
-        programId = glCreateProgram();
-        glAttachShader(programId, fragmentShaderId);
-        glAttachShader(programId, vertexShaderId);
-        glLinkProgram(programId);
-
-        if (glGetProgrami(programId, GL_LINK_STATUS) != GL_TRUE) {
-            throw new IllegalStateException(glGetProgramInfoLog(programId));
-        }
-    }
-
-    private void prepareFont() {
         gFontTexture = glGenTextures();
 
         final ImFontAtlas fontAtlas = ImGui.getIO().getFonts();
@@ -184,11 +218,102 @@ public final class ImGuiImplGl3 {
         fontAtlas.setTexID(gFontTexture);
     }
 
+    private void readGlVersion() {
+        final int[] major = new int[1];
+        final int[] minor = new int[1];
+        glGetIntegerv(GL_MAJOR_VERSION, major);
+        glGetIntegerv(GL_MINOR_VERSION, minor);
+        glVersion = major[0] * 100 + minor[0] * 10;
+    }
+
+    private void setupBackendCapabilitiesFlags() {
+        final ImGuiIO io = ImGui.getIO();
+        io.setBackendRendererName("imgui_java_impl_opnegl3");
+
+        // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+        if (glVersion >= 320) {
+            io.setBackendFlags(io.getBackendFlags() | ImGuiBackendFlags.RendererHasVtxOffset);
+        }
+    }
+
+    private void createDeviceObjects() {
+        // Backup GL state
+        final int[] lastTexture = new int[1];
+        final int[] lastArrayBuffer = new int[1];
+        final int[] lastVertexArray = new int[1];
+        glGetIntegerv(GL_TEXTURE_BINDING_2D, lastTexture);
+        glGetIntegerv(GL_ARRAY_BUFFER_BINDING, lastArrayBuffer);
+        glGetIntegerv(GL_VERTEX_ARRAY_BINDING, lastVertexArray);
+
+        createShaders();
+
+        gAttribLocationTex = glGetUniformLocation(gShaderHandle, "Texture");
+        gAttribLocationProjMtx = glGetUniformLocation(gShaderHandle, "ProjMtx");
+        gAttribLocationVtxPos = glGetAttribLocation(gShaderHandle, "Position");
+        gAttribLocationVtxUV = glGetAttribLocation(gShaderHandle, "UV");
+        gAttribLocationVtxColor = glGetAttribLocation(gShaderHandle, "Color");
+
+        // Create buffers
+        gVboHandle = glGenBuffers();
+        gElementsHandle = glGenBuffers();
+
+        updateFontsTexture();
+
+        // Restore modified GL state
+        glBindTexture(GL_TEXTURE_2D, lastTexture[0]);
+        glBindBuffer(GL_ARRAY_BUFFER, lastArrayBuffer[0]);
+        glBindVertexArray(lastVertexArray[0]);
+    }
+
+    private void createShaders() {
+        final int glslVersionValue = parseGlslVersionString();
+
+        // Select shaders matching our GLSL versions
+        final CharSequence vertShaderSource;
+        final CharSequence fragShaderSource;
+
+        if (glslVersionValue < 130) {
+            vertShaderSource = getVertexShaderGlsl120();
+            fragShaderSource = getFragmentShaderGlsl120();
+        } else if (glslVersionValue >= 410) {
+            vertShaderSource = getVertexShaderGlsl410Core();
+            fragShaderSource = getFragmentShaderGlsl410Core();
+        } else {
+            vertShaderSource = getVertexShaderGlsl130();
+            fragShaderSource = getFragmentShaderGlsl130();
+        }
+
+        gVertHandle = createAndCompileShader(GL_VERTEX_SHADER, vertShaderSource);
+        gFragHandle = createAndCompileShader(GL_FRAGMENT_SHADER, fragShaderSource);
+
+        gShaderHandle = glCreateProgram();
+        glAttachShader(gShaderHandle, gVertHandle);
+        glAttachShader(gShaderHandle, gFragHandle);
+        glLinkProgram(gShaderHandle);
+
+        if (glGetProgrami(gShaderHandle, GL_LINK_STATUS) == GL_FALSE) {
+            throw new IllegalStateException("Failed to link shader program:\n" + glGetProgramInfoLog(gShaderHandle));
+        }
+    }
+
+    private int parseGlslVersionString() {
+        final Pattern p = Pattern.compile("\\d+");
+        final Matcher m = p.matcher(glslVersion);
+
+        if (m.find()) {
+            return Integer.parseInt(m.group());
+        } else {
+            throw new IllegalArgumentException("Invalid GLSL version string: " + glslVersion);
+        }
+    }
+
     private void backupGlState() {
         glGetIntegerv(GL_ACTIVE_TEXTURE, lastActiveTexture);
+        glActiveTexture(GL_TEXTURE0);
         glGetIntegerv(GL_CURRENT_PROGRAM, lastProgram);
         glGetIntegerv(GL_TEXTURE_BINDING_2D, lastTexture);
         glGetIntegerv(GL_ARRAY_BUFFER_BINDING, lastArrayBuffer);
+        glGetIntegerv(GL_VERTEX_ARRAY_BINDING, lastVertexArrayObject);
         glGetIntegerv(GL_VIEWPORT, lastViewport);
         glGetIntegerv(GL_SCISSOR_BOX, lastScissorBox);
         glGetIntegerv(GL_BLEND_SRC_RGB, lastBlendSrcRgb);
@@ -207,6 +332,7 @@ public final class ImGuiImplGl3 {
         glUseProgram(lastProgram[0]);
         glBindTexture(GL_TEXTURE_2D, lastTexture[0]);
         glActiveTexture(lastActiveTexture[0]);
+        glBindVertexArray(lastVertexArrayObject[0]);
         glBindBuffer(GL_ARRAY_BUFFER, lastArrayBuffer[0]);
         glBlendEquationSeparate(lastBlendEquationRgb[0], lastBlendEquationAlpha[0]);
         glBlendFuncSeparate(lastBlendSrcRgb[0], lastBlendDstRgb[0], lastBlendSrcAlpha[0], lastBlendDstAlpha[0]);
@@ -220,9 +346,13 @@ public final class ImGuiImplGl3 {
         glScissor(lastScissorBox[0], lastScissorBox[1], lastScissorBox[2], lastScissorBox[3]);
     }
 
+    // Setup desired GL state
     private void bind() {
-        glViewport(0, 0, (int) displaySize.x, (int) displaySize.y);
+        // Recreate the VAO every time (this is to easily allow multiple GL contexts to be rendered to. VAO are not shared among GL contexts)
-        glActiveTexture(GL_TEXTURE0);
+        // The renderer would actually work without any VAO bound, but then our VertexAttrib calls would overwrite the default one currently bound.
+        gVertexArrayObjectHandle = glGenVertexArrays();
+
+        // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, polygon fill
         glEnable(GL_BLEND);
         glBlendEquation(GL_FUNC_ADD);
         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
@@ -230,83 +360,142 @@ public final class ImGuiImplGl3 {
         glDisable(GL_DEPTH_TEST);
         glEnable(GL_SCISSOR_TEST);
 
+        // Setup viewport, orthographic projection matrix
+        // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right).
+        // DisplayPos is (0,0) for single viewport apps.
+        glViewport(0, 0, (int) displaySize.x, (int) displaySize.y);
         final float left = displayPos.x;
         final float right = displayPos.x + displaySize.x;
         final float top = displayPos.y;
         final float bottom = displayPos.y + displaySize.y;
 
         // Orthographic matrix projection
-        projMatrix[0] = 2.0f / (right - left);
+        orthoProjMatrix[0] = 2.0f / (right - left);
-        projMatrix[5] = 2.0f / (top - bottom);
+        orthoProjMatrix[5] = 2.0f / (top - bottom);
-        projMatrix[10] = -1.0f;
+        orthoProjMatrix[10] = -1.0f;
-        projMatrix[12] = (right + left) / (left - right);
+        orthoProjMatrix[12] = (right + left) / (left - right);
-        projMatrix[13] = (top + bottom) / (bottom - top);
+        orthoProjMatrix[13] = (top + bottom) / (bottom - top);
-        projMatrix[15] = 1.0f;
+        orthoProjMatrix[15] = 1.0f;
 
         // Bind shader
-        glUseProgram(programId);
+        glUseProgram(gShaderHandle);
-        glUniform1i(glGetUniformLocation(programId, "Texture"), 0);
+        glUniform1i(gAttribLocationTex, 0);
-        glUniformMatrix4fv(glGetUniformLocation(programId, "ProjMtx"), false, projMatrix);
+        glUniformMatrix4fv(gAttribLocationProjMtx, false, orthoProjMatrix);
+
+        glBindVertexArray(gVertexArrayObjectHandle);
 
         // Bind vertex/index buffers and setup attributes for ImDrawVert
-        glBindBuffer(GL_ARRAY_BUFFER, vboHandle);
+        glBindBuffer(GL_ARRAY_BUFFER, gVboHandle);
-        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, elementsHandle);
+        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, gElementsHandle);
-
+        glEnableVertexAttribArray(gAttribLocationVtxPos);
-        int location = glGetAttribLocation(programId, "Position");
+        glEnableVertexAttribArray(gAttribLocationVtxUV);
-        glEnableVertexAttribArray(location);
+        glEnableVertexAttribArray(gAttribLocationVtxColor);
-        glVertexAttribPointer(location, 2, GL_FLOAT, false, ImDrawData.SIZEOF_IM_DRAW_VERT, 0);
+        glVertexAttribPointer(gAttribLocationVtxPos, 2, GL_FLOAT, false, ImDrawData.SIZEOF_IM_DRAW_VERT, 0);
-
+        glVertexAttribPointer(gAttribLocationVtxUV, 2, GL_FLOAT, false, ImDrawData.SIZEOF_IM_DRAW_VERT, 8);
-        location = glGetAttribLocation(programId, "UV");
+        glVertexAttribPointer(gAttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, true, ImDrawData.SIZEOF_IM_DRAW_VERT, 16);
-        glEnableVertexAttribArray(location);
-        glVertexAttribPointer(location, 2, GL_FLOAT, false, ImDrawData.SIZEOF_IM_DRAW_VERT, 8);
-
-        location = glGetAttribLocation(programId, "Color");
-        glEnableVertexAttribArray(location);
-        glVertexAttribPointer(location, 4, GL_UNSIGNED_BYTE, true, ImDrawData.SIZEOF_IM_DRAW_VERT, 16);
     }
 
     private void unbind() {
-        // Unbind vertices
+        // Destroy the temporary VAO
-        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        glDeleteVertexArrays(gVertexArrayObjectHandle);
-
-        glDisableVertexAttribArray(glGetAttribLocation(programId, "Position"));
-        glDisableVertexAttribArray(glGetAttribLocation(programId, "UV"));
-        glDisableVertexAttribArray(glGetAttribLocation(programId, "Color"));
-
-        // Unbind index
-        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
-        glFlush();
-
-        // Unbind shader
-        glUseProgram(0);
     }
 
-    private int loadAndCompileShader(final int type, final CharSequence source) {
+    private int createAndCompileShader(final int type, final CharSequence source) {
         final int id = glCreateShader(type);
 
         glShaderSource(id, source);
         glCompileShader(id);
 
-        if (glGetShaderi(id, GL_COMPILE_STATUS) != GL_TRUE) {
+        if (glGetShaderi(id, GL_COMPILE_STATUS) == GL_FALSE) {
-            throw new IllegalStateException(glGetShaderInfoLog(id));
+            throw new IllegalStateException("Failed to compile shader:\n" + glGetShaderInfoLog(id));
         }
 
         return id;
     }
 
-    private CharSequence readFromResources(final String path) {
+    private String getVertexShaderGlsl120() {
-        final StringBuilder builder = new StringBuilder();
+        return glslVersion + "\n"
+            + "uniform mat4 ProjMtx;\n"
+            + "attribute vec2 Position;\n"
+            + "attribute vec2 UV;\n"
+            + "attribute vec4 Color;\n"
+            + "varying vec2 Frag_UV;\n"
+            + "varying vec4 Frag_Color;\n"
+            + "void main()\n"
+            + "{\n"
+            + "    Frag_UV = UV;\n"
+            + "    Frag_Color = Color;\n"
+            + "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+            + "}\n";
+    }
 
-        try (InputStream in = getClass().getClassLoader().getResourceAsStream(path);
+    private String getVertexShaderGlsl130() {
-             BufferedReader reader = new BufferedReader(new InputStreamReader(Objects.requireNonNull(in)))) {
+        return glslVersion + "\n"
-            String line;
+            + "uniform mat4 ProjMtx;\n"
-            while ((line = reader.readLine()) != null) {
+            + "in vec2 Position;\n"
-                builder.append(line).append('\n');
+            + "in vec2 UV;\n"
-            }
+            + "in vec4 Color;\n"
-        } catch (IOException ex) {
+            + "out vec2 Frag_UV;\n"
-            throw new UncheckedIOException("Failed to read from resources!", ex);
+            + "out vec4 Frag_Color;\n"
-        }
+            + "void main()\n"
+            + "{\n"
+            + "    Frag_UV = UV;\n"
+            + "    Frag_Color = Color;\n"
+            + "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+            + "}\n";
+    }
 
-        return builder.toString();
+    private String getVertexShaderGlsl410Core() {
+        return glslVersion + "\n"
+            + "layout (location = 0) in vec2 Position;\n"
+            + "layout (location = 1) in vec2 UV;\n"
+            + "layout (location = 2) in vec4 Color;\n"
+            + "uniform mat4 ProjMtx;\n"
+            + "out vec2 Frag_UV;\n"
+            + "out vec4 Frag_Color;\n"
+            + "void main()\n"
+            + "{\n"
+            + "    Frag_UV = UV;\n"
+            + "    Frag_Color = Color;\n"
+            + "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+            + "}\n";
+    }
+
+    private String getFragmentShaderGlsl120() {
+        return glslVersion + "\n"
+            + "#ifdef GL_ES\n"
+            + "    precision mediump float;\n"
+            + "#endif\n"
+            + "uniform sampler2D Texture;\n"
+            + "varying vec2 Frag_UV;\n"
+            + "varying vec4 Frag_Color;\n"
+            + "void main()\n"
+            + "{\n"
+            + "    gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st);\n"
+            + "}\n";
+    }
+
+    private String getFragmentShaderGlsl130() {
+        return glslVersion + "\n"
+            + "uniform sampler2D Texture;\n"
+            + "in vec2 Frag_UV;\n"
+            + "in vec4 Frag_Color;\n"
+            + "out vec4 Out_Color;\n"
+            + "void main()\n"
+            + "{\n"
+            + "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+            + "}\n";
+    }
+
+    private String getFragmentShaderGlsl410Core() {
+        return glslVersion + "\n"
+            + "in vec2 Frag_UV;\n"
+            + "in vec4 Frag_Color;\n"
+            + "uniform sampler2D Texture;\n"
+            + "layout (location = 0) out vec4 Out_Color;\n"
+            + "void main()\n"
+            + "{\n"
+            + "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+            + "}\n";
     }
 }

imgui-lwjgl3/src/main/resources/default.frag

@@ -1,14 +0,0 @@
-#version 130
-
-#ifdef GL_ES
-precision mediump float;
-#endif
-
-uniform sampler2D Texture;
-in vec2 Frag_UV;
-in vec4 Frag_Color;
-
-void main()
-{
-    gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st);
-}

imgui-lwjgl3/src/main/resources/default.vert

@@ -1,15 +0,0 @@
-#version 130
-
-uniform mat4 ProjMtx;
-in vec2 Position;
-in vec2 UV;
-in vec4 Color;
-out vec2 Frag_UV;
-out vec4 Frag_Color;
-
-void main()
-{
-    Frag_UV = UV;
-    Frag_Color = Color;
-    gl_Position = ProjMtx * vec4(Position.xy, 0, 1);
-}