Java GL4.glDrawArraysInstanced方法代码示例

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
private void renderFBO(GL4 gl4, int framebuffer) {

        gl4.glEnable(GL_DEPTH_TEST);

        gl4.glBindProgramPipeline(pipelineName.get(Program.THROUGH));
        gl4.glBindBufferRange(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM), 0,
                uniformBlockSize);

        gl4.glViewport(0, 0, FRAMEBUFFER_SIZE.x, FRAMEBUFFER_SIZE.y);

        gl4.glBindFramebuffer(GL_FRAMEBUFFER, framebuffer);
        float[] depth = {1.0f};
        gl4.glClearBufferfv(GL_DEPTH, 0, depth, 0);
        gl4.glClearBufferfv(GL_COLOR, 0, new float[]{1.0f, 0.5f, 0.0f, 1.0f}, 0);

        textureName.position(Texture.DIFFUSE);
        gl4.glBindTextures(0, 1, textureName);
        textureName.rewind();
        gl4.glBindVertexArray(vertexArrayName.get(0));

        gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 5);

        gl4.glDisable(GL_DEPTH_TEST);
    }
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    gl4.glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

    Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, (float) windowSize.x / windowSize.y, 0.1f, 100.0f);
    Mat4 model = new Mat4(1.0f);
    Mat4 mvp = projection.mul(viewMat4()).mul(model);

    gl4.glViewport(0, 0, windowSize.x, windowSize.y);
    gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 0).put(1, 0).put(2, 0).put(3, 0));

    gl4.glUseProgram(programName);
    gl4.glUniformMatrix4fv(uniformMvp, 1, false, mvp.toFa_(), 0);

    gl4.glBindVertexArray(vertexArrayName.get(0));
    gl4.glPatchParameteri(GL_PATCH_VERTICES, vertexCount);
    gl4.glPatchParameterfv(GL_PATCH_DEFAULT_INNER_LEVEL, patch.put(0, 16).put(1, 16));
    gl4.glPatchParameterfv(GL_PATCH_DEFAULT_OUTER_LEVEL, patch.put(0, 16).put(1, 16).put(2, 16).put(3, 16));
    gl4.glDrawArraysInstanced(GL_PATCHES, 0, vertexCount, 1);

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
private void resolveMultisampling(GL4 gl4) {

        gl4.glViewport(0, 0, windowSize.x, windowSize.y);
        gl4.glBindFramebuffer(GL_FRAMEBUFFER, 0);

        textureName.position(Texture.MULTISAMPLE_COLORBUFFER);
        gl4.glBindTextures(0, 1, textureName);
        textureName.rewind();
        gl4.glBindVertexArray(vertexArrayName.get(0));
        gl4.glBindBufferRange(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM),
                uniformBlockSize, uniformBlockSize);

        gl4.glEnable(GL_SCISSOR_TEST);

        // Box
        {
            gl4.glScissor(1, 1, windowSize.x / 2 - 2, windowSize.y - 2);

            gl4.glBindProgramPipeline(pipelineName.get(Program.RESOLVE_BOX));
            gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 5);
        }

        // Near
        {
            gl4.glScissor(windowSize.x / 2 + 1, 1, windowSize.x / 2 - 2, windowSize.y - 2);

            gl4.glBindProgramPipeline(pipelineName.get(Program.RESOLVE_NEAR));
            gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 5);
        }

        gl4.glDisable(GL_SCISSOR_TEST);
    }
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    Vec2i framebufferSize = new Vec2i(windowSize.x / FRAMEBUFFER_SIZE, windowSize.y / FRAMEBUFFER_SIZE);

    // Pass 1
    gl4.glBindFramebuffer(GL_FRAMEBUFFER, framebufferName.get(0));
    gl4.glViewport(0, 0, framebufferSize.x, framebufferSize.y);
    gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 1).put(1, 0).put(2, 0).put(3, 1));
    gl4.glClearBufferfv(GL_COLOR, 1, clearColor.put(0, 0).put(1, 1).put(2, 0).put(3, 1));
    gl4.glClearBufferfv(GL_COLOR, 2, clearColor.put(0, 0).put(1, 0).put(2, 1).put(3, 1));
    gl4.glClearBufferfv(GL_COLOR, 3, clearColor.put(0, 1).put(1, 1).put(2, 0).put(3, 1));

    // Pass 2
    gl4.glBindFramebuffer(GL_FRAMEBUFFER, 0);
    gl4.glViewport(0, 0, windowSize.x, windowSize.y);
    gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 1).put(1, .5f).put(2, 0).put(3, 1));

    gl4.glUseProgram(programName);
    gl4.glUniform1i(uniformDiffuse, 0);

    gl4.glActiveTexture(GL_TEXTURE0);
    gl4.glBindTexture(GL_TEXTURE_2D_ARRAY, textureName.get(0));
    gl4.glBindVertexArray(vertexArrayName.get(0));

    for (int i = 0; i < Texture.MAX; ++i) {
        gl4.glViewport((int) viewport[i].x, (int) viewport[i].y, (int) viewport[i].z, (int) viewport[i].w);
        gl4.glUniform1i(uniformLayer, i);

        gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 1);
    }

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, windowSize.x * 0.5f / windowSize.y, 0.1f, 100.0f);
    Mat4 model = new Mat4(1.0f);
    Mat4 mvp = projection.mul(viewMat4()).mul(model);

    gl4.glViewport(0, 0, windowSize.x, windowSize.y);
    gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 0).put(1, 0).put(2, 0).put(3, 1));

    gl4.glBindVertexArray(vertexArrayName.get(0));
    gl4.glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufferName.get(Buffer.ELEMENT));

    gl4.glViewport(0, 0, (int) (windowSize.x * 0.5f), windowSize.y);
    gl4.glUseProgram(programName[Program.TESS]);
    gl4.glUniformMatrix4fv(uniformMvp[Program.TESS], 1, false, mvp.toFa_(), 0);

    gl4.glPatchParameteri(GL_PATCH_VERTICES, vertexCount);
    gl4.glDrawArraysInstanced(GL_PATCHES, 0, vertexCount, 1);

    gl4.glViewport((int) (windowSize.x * 0.5f), 0, (int) (windowSize.x * 0.5f), windowSize.y);
    gl4.glUseProgram(programName[Program.SMOOTH]);
    gl4.glUniformMatrix4fv(uniformMvp[Program.SMOOTH], 1, false, mvp.toFa_(), 0);

    gl4.glDrawElementsInstancedBaseVertex(GL_TRIANGLES, elementCount, GL_UNSIGNED_SHORT, 0, 1, 0);

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    {
        float aspect = (windowSize.x * 0.33f) / (windowSize.y * 0.50f);
        Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, aspect, 0.1f, 100.0f);
        Mat4 mvp = projection.mul(viewMat4()).mul(new Mat4(1.0f));

        uniformPointer.asFloatBuffer().put(mvp.toFa_());
    }

    gl4.glClearBufferfv(GL_COLOR, 0, new float[]{1.0f, 0.5f, 0.0f, 1.0f}, 0);

    gl4.glBindProgramPipeline(pipelineName.get(0));
    bufferName.position(Buffer.TRANSFORM);
    gl4.glBindBuffersBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, 1, bufferName);
    gl4.glBindTextures(Semantic.Sampler.DIFFUSE, 1, textureName);
    gl4.glBindVertexArray(vertexArrayName.get(0));
    gl4.glBindVertexBuffer(Semantic.Buffer.STATIC, bufferName.get(Buffer.VERTEX), 0, Vertex_v2fv2f.SIZE);

    for (int index = 0; index < Viewport.MAX; ++index) {

        gl4.glViewportIndexedf(0,
                viewport[index].x,
                viewport[index].y,
                viewport[index].z,
                viewport[index].w);

        samplerName.position(index);
        gl4.glBindSamplers(0, 1, samplerName);
        gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 1);
    }

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    {
        // Compute the MVP (Model View Projection matrix)
        float aspect = (windowSize.x * 0.33f) / (windowSize.y * 0.50f);
        Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, aspect, 0.1f, 100.0f);
        Mat4 mvp = projection.mul(viewMat4()).mul(new Mat4(1.0f));

        uniformPointer.asFloatBuffer().put(mvp.toFa_());
    }

    gl4.glClearBufferfv(GL_COLOR, 0, new float[]{1.0f, 1.0f, 1.0f, 1.0f}, 0);

    gl4.glBindProgramPipeline(pipelineName.get(0));
    gl4.glBindBufferBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM));

    for (int index = 0; index < Viewport.MAX; ++index) {

        gl4.glViewportIndexedf(0,
                viewport[index].viewport.x,
                viewport[index].viewport.y,
                viewport[index].viewport.z,
                viewport[index].viewport.w);

        gl4.glBindVertexArray(vertexArrayName.get(viewport[index].vertexFormat));
        gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 1);
    }

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    {
        gl4.glBindBuffer(GL_UNIFORM_BUFFER, bufferName.get(Buffer.TRANSFORM));
        ByteBuffer pointer = gl4.glMapBufferRange(GL_UNIFORM_BUFFER, 0, Mat4.SIZE,
                GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);

        Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, (float) windowSize.x / windowSize.y, 0.1f, 100.0f);

        projection.mul(viewMat4()).toDbb(pointer);

        // Make sure the uniform buffer is uploaded
        gl4.glUnmapBuffer(GL_UNIFORM_BUFFER);
    }

    {
        gl4.glEnable(GL_DEPTH_TEST);
        gl4.glDepthFunc(GL_LESS);

        gl4.glViewport(0, 0, windowSize.x * framebufferScale, windowSize.y * framebufferScale);

        gl4.glBindFramebuffer(GL_FRAMEBUFFER, framebufferName.get(0));

        // Convert linear clear color to sRGB color space, FramebufferName is a sRGB FBO
        gl4.glEnable(GL_FRAMEBUFFER_SRGB);
        gl4.glClearBufferfv(GL_DEPTH, 0, clearDepth.put(0, 1.0f));
        gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 1.0f).put(1, 0.5f).put(2, 0.0f).put(3, 1.0f));

        // TextureName[texture::DIFFUSE] is a sRGB texture which sRGB conversion on fetch has been disabled
        // Hence in the shader, the value is stored as sRGB so we should not convert it to sRGB.
        gl4.glDisable(GL_FRAMEBUFFER_SRGB);
        gl4.glUseProgram(programName[Program.TEXTURE]);

        gl4.glActiveTexture(GL_TEXTURE0);
        gl4.glBindTexture(GL_TEXTURE_2D_ARRAY, textureName.get(Texture.DIFFUSE_RGB));
        gl4.glBindVertexArray(vertexArrayName.get(Program.TEXTURE));
        gl4.glBindBufferBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM));

        gl4.glDrawElementsInstancedBaseVertex(GL_TRIANGLES, elementCount, GL_UNSIGNED_SHORT, 0, 2, 0);
    }

    {
        gl4.glDisable(GL_DEPTH_TEST);

        gl4.glViewport(0, 0, windowSize.x, windowSize.y);

        gl4.glBindFramebuffer(GL_FRAMEBUFFER, 0);

        gl4.glUseProgram(programName[Program.SPLASH]);

        gl4.glActiveTexture(GL_TEXTURE0);
        gl4.glBindVertexArray(vertexArrayName.get(Program.SPLASH));
        gl4.glBindTexture(GL_TEXTURE_2D, textureName.get(Texture.COLORBUFFER));

        gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, 3, 1);
    }

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
    protected boolean render(GL gl) {

        GL4 gl4 = (GL4) gl;

        {
            gl4.glBindBuffer(GL_UNIFORM_BUFFER, bufferName.get(Buffer.TRANSFORM));
            ByteBuffer pointer = gl4.glMapBufferRange(GL_UNIFORM_BUFFER,
                    0, Mat4.SIZE, GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);

            Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, (float) windowSize.x / windowSize.y, 0.1f, 100.0f);
            Mat4 model = new Mat4(1.0f);

            pointer.asFloatBuffer().put(projection.mul(viewMat4()).mul(model).toFa_());

            gl4.glUnmapBuffer(GL_UNIFORM_BUFFER);
        }

        // Set the display viewport
        gl4.glViewport(0, 0, windowSize.x, windowSize.y);
        gl4.glBindBufferBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM));

        // Clear color buffer with black
        gl4.glClearBufferfv(GL_COLOR, 0, new float[]{0.0f, 0.0f, 0.0f, 1.0f}, 0);

        gl4.glBindProgramPipeline(pipelineName.get(0));
        gl4.glBindVertexArray(vertexArrayName.get(0));
        gl4.glBindBufferRange(GL_UNIFORM_BUFFER, Semantic.Uniform.MATERIAL, bufferName.get(Buffer.MATERIAL), 0, Vec4.SIZE);

        // The first orange quad is not written in the framebuffer.
//        gl4.glColorMaski(0, false, false, false, false);

        // Beginning of the samples count query
        gl4.glBeginQuery(GL_ANY_SAMPLES_PASSED_CONSERVATIVE, queryName.get(0));
        {
            if (toggle) {
                // To test the condional rendering, comment this line, the next draw call won't happen.
                gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 1);
            }
        }// End of the samples count query
        gl4.glEndQuery(GL_ANY_SAMPLES_PASSED_CONSERVATIVE);

        // The second blue quad is written in the framebuffer only if a sample pass the occlusion query.
        gl4.glColorMaski(0, true, true, true, true);

        gl4.glBindBufferRange(GL_UNIFORM_BUFFER, Semantic.Uniform.MATERIAL, bufferName.get(Buffer.MATERIAL),
                uniformMaterialOffset, Vec4.SIZE);

        // Draw only if one sample went through the tests, 
        // we don't need to get the query result which prevent the rendering pipeline to stall.
        gl4.glBeginConditionalRender(queryName.get(0), GL_QUERY_WAIT);
        {
            // Clear color buffer with white
            gl4.glClearBufferfv(GL_COLOR, 0, new float[]{1.0f, 1.0f, 1.0f, 1.0f}, 0);

//            gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 1);
        }
        gl4.glEndConditionalRender();

        toggle = !toggle;

        return true;
    }
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    {
        gl4.glBindBuffer(GL_UNIFORM_BUFFER, bufferName.get(Buffer.TRANSFORM));
        ByteBuffer pointer = gl4.glMapBufferRange(GL_UNIFORM_BUFFER, 0, Mat4.SIZE,
                GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);

        Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, (float) windowSize.x / windowSize.y, 0.1f, 100.0f);
        Mat4 model = new Mat4(1.0f);

        pointer.asFloatBuffer().put(projection.mul(viewMat4()).mul(model).toFa_());

        gl4.glUnmapBuffer(GL_UNIFORM_BUFFER);
    }

    // Set the display viewport
    gl4.glViewport(0, 0, windowSize.x, windowSize.y);

    // Clear color buffer with black
    gl4.glClearBufferfv(GL_COLOR, 0, new float[]{0.0f, 0.0f, 0.0f, 1.0f}, 0);

    gl4.glBindProgramPipeline(pipelineName.get(0));
    gl4.glBindVertexArray(vertexArrayName.get(0));
    gl4.glBindBufferBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM));

    // Samples count query
    gl4.glBeginQuery(GL_ANY_SAMPLES_PASSED_CONSERVATIVE, queryName.get(0));
    {
        gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 1);
    }
    gl4.glEndQuery(GL_ANY_SAMPLES_PASSED_CONSERVATIVE);

    // Get the count of samples. 
    // If the result of the query isn't here yet, we wait here...
    int[] samplesCount = {0};
    gl4.glGetQueryObjectuiv(queryName.get(0), GL_QUERY_RESULT, samplesCount, 0);
    System.out.println("Samples count: " + (samplesCount[0] == GL_TRUE));

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    {
        Mat4 model = new Mat4(1.0f);
        Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, (float) windowSize.x / windowSize.y, 0.1f, 100.0f);
        Mat4 mvp = projection.mul(viewMat4()).mul(model);

        uniformPointer.asFloatBuffer().put(mvp.toFa_());
    }

    // Set the display viewport
    gl4.glViewportIndexedf(0, 0.0f, 0.0f, windowSize.x, windowSize.y);

    // Clear color buffer
    gl4.glClearBufferfv(GL_COLOR, 0, new float[]{0.0f, 0.0f, 0.0f, 1.0f}, 0);

    // First draw, capture the attributes
    // Disable rasterisation, vertices processing only!
    gl4.glEnable(GL_RASTERIZER_DISCARD);

    gl4.glBindProgramPipeline(pipelineName.get(Program.TRANSFORM));
    gl4.glBindBufferBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM));
    gl4.glBindVertexArray(vertexArrayName.get(Program.TRANSFORM));
    gl4.glBindVertexBuffer(Semantic.Buffer.STATIC, bufferName.get(Buffer.VERTEX), 0, Vec4.SIZE);

    gl4.glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, feedbackName.get(0));

    gl4.glBeginQueryIndexed(GL_TRANSFORM_FEEDBACK_STREAM_OVERFLOW_ARB, 0, queryName.get(0));
    gl4.glBeginTransformFeedback(GL_TRIANGLES);
    {
        gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 1);
    }
    gl4.glEndTransformFeedback();
    gl4.glEndQueryIndexed(GL_TRANSFORM_FEEDBACK_STREAM_OVERFLOW_ARB, 0);

    gl4.glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, 0);

    gl4.glDisable(GL_RASTERIZER_DISCARD);

    IntBuffer streamOverflow = GLBuffers.newDirectIntBuffer(1);
    gl4.glGetQueryObjectuiv(queryName.get(0), GL_QUERY_RESULT, streamOverflow);

    if (streamOverflow.get(0) == 0) {

        // Second draw, reuse the captured attributes
        gl4.glBindProgramPipeline(pipelineName.get(Program.FEEDBACK));
        gl4.glBindVertexArray(vertexArrayName.get(Program.FEEDBACK));
        gl4.glBindVertexBuffer(Semantic.Buffer.STATIC, bufferName.get(Buffer.FEEDBACK), 0, glf.Vertex_v4fc4f.SIZE);

        gl4.glDrawTransformFeedback(GL_TRIANGLES, feedbackName.get(0));
    }
    BufferUtils.destroyDirectBuffer(streamOverflow);
    
    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    gl4.glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

    Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, (float) windowSize.x / windowSize.y, 0.1f, 100.0f);
    Mat4 model = new Mat4(1.0f);
    Mat4 mvp = projection.mul(viewMat4()).mul(model);

    gl4.glViewport(0, 0, windowSize.x, windowSize.y);

    gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 0).put(1, 0).put(2, 0).put(3, 0));

    gl4.glUseProgram(programName);
    gl4.glUniformMatrix4fv(uniformMvp, 1, false, mvp.toFa_(), 0);

    gl4.glBindVertexArray(vertexArrayName.get(0));
    gl4.glPatchParameteri(GL_PATCH_VERTICES, vertexCount);
    gl4.glDrawArraysInstanced(GL_PATCHES, 0, vertexCount, 1);

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    // Compute the MVP (Model View Projection matrix)
    {
        gl4.glBindBuffer(GL_UNIFORM_BUFFER, bufferName.get(Buffer.TRANSFORM0));
        ByteBuffer pointer = gl4.glMapBufferRange(GL_UNIFORM_BUFFER, 0,
                Mat4.SIZE, GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);

        Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, (float) windowSize.x / windowSize.y, 0.1f, 100.0f);
        Mat4 model = new Mat4(1.0f);

        pointer.asFloatBuffer().put(projection.mul(viewMat4()).mul(model).toFa_());

        gl4.glUnmapBuffer(GL_UNIFORM_BUFFER);
    }

    // Set the display viewport
    gl4.glViewport(0, 0, windowSize.x, windowSize.y);

    // Clear color buffer
    gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 0).put(1, 0).put(2, 0).put(3, 1));

    // First draw, capture the attributes
    // Disable rasterisation, vertices processing only!
    gl4.glEnable(GL_RASTERIZER_DISCARD);

    gl4.glUseProgram(transformProgramName);

    gl4.glBindVertexArray(vertexArrayName.get(VertexArray.TRANSFORM_FEEDBACK));
    gl4.glBindBufferBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM0));

    gl4.glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, feedbackName.get(0));
    gl4.glBeginTransformFeedback(GL_TRIANGLES);
    gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, vertexCount, 1);
    gl4.glEndTransformFeedback();
    gl4.glBindTransformFeedback(GL_TRANSFORM_FEEDBACK, 0);

    gl4.glDisable(GL_RASTERIZER_DISCARD);

    // Second draw, reuse the captured attributes
    gl4.glUseProgram(feedbackProgramName);

    gl4.glBindVertexArray(vertexArrayName.get(VertexArray.FEEDBACK));
    gl4.glDrawTransformFeedback(GL_TRIANGLES, feedbackName.get(0));

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    Vec2i framebufferSize = new Vec2i(windowSize.x / FRAMEBUFFER_SIZE, windowSize.y / FRAMEBUFFER_SIZE);

    // Update of the uniform buffer
    {
        gl4.glBindBuffer(GL_UNIFORM_BUFFER, bufferName.get(Buffer.TRANSFORM));
        ByteBuffer pointer = gl4.glMapBufferRange(
                GL_UNIFORM_BUFFER, 0, Mat4.SIZE,
                GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);

        Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, 4.0f / 3.0f, 0.1f, 100.0f);
        Mat4 model = new Mat4(1.0f);

        pointer.asFloatBuffer().put(projection.mul(viewMat4()).mul(model).toFa_());

        // Make sure the uniform buffer is uploaded
        gl4.glUnmapBuffer(GL_UNIFORM_BUFFER);
    }

    gl4.glEnable(GL_DEPTH_TEST);
    gl4.glDepthFunc(GL_LESS);

    gl4.glViewport(0, 0, framebufferSize.x, framebufferSize.y);
    gl4.glBindFramebuffer(GL_FRAMEBUFFER, framebufferName.get(0));
    
    gl4.glClearBufferfv(GL_DEPTH, 0, clearDepth.put(0,1));
    gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 0).put(1, 0).put(2, 0).put(3, 1));

    gl4.glUseProgram(programName[Program.TEXTURE]);
    gl4.glUniform1i(uniformDiffuse[Program.TEXTURE], 0);
    gl4.glUniformBlockBinding(programName[Program.TEXTURE], uniformTransform,
            Semantic.Uniform.TRANSFORM0);

    gl4.glActiveTexture(GL_TEXTURE0);
    gl4.glBindTexture(GL_TEXTURE_2D, textureName.get(Texture.DIFFUSE));
    gl4.glBindVertexArray(vertexArrayName.get(Program.TEXTURE));
    gl4.glBindBufferBase(GL_UNIFORM_BUFFER, Semantic.Uniform.TRANSFORM0, bufferName.get(Buffer.TRANSFORM));

    gl4.glEnable(GL_SCISSOR_TEST);
    {
        gl4.glScissor(0, 0, framebufferSize.x / 2, framebufferSize.y);
        gl4.glUniform1i(uniformUseGrad, 1);
        gl4.glDrawElementsInstancedBaseVertex(GL_TRIANGLES, elementCount, GL_UNSIGNED_SHORT, 0, 2, 0);

        gl4.glScissor(framebufferSize.x / 2, 0, framebufferSize.x / 2, framebufferSize.y);
        gl4.glUniform1i(uniformUseGrad, 0);
        gl4.glDrawElementsInstancedBaseVertex(GL_TRIANGLES, elementCount, GL_UNSIGNED_SHORT, 0, 2, 0);
    }
    gl4.glDisable(GL_SCISSOR_TEST);

    gl4.glDisable(GL_DEPTH_TEST);
    gl4.glViewport(0, 0, windowSize.x, windowSize.y);
    gl4.glBindFramebuffer(GL_FRAMEBUFFER, 0);
    gl4.glUseProgram(programName[Program.SPLASH]);
    gl4.glUniform1i(uniformDiffuse[Program.SPLASH], 0);
    gl4.glUniform1f(uniformFramebufferSize, FRAMEBUFFER_SIZE);

    gl4.glActiveTexture(GL_TEXTURE0);
    gl4.glBindVertexArray(vertexArrayName.get(Program.SPLASH));
    gl4.glBindTexture(GL_TEXTURE_2D, textureName.get(Texture.COLORBUFFER));

    gl4.glDrawArraysInstanced(GL_TRIANGLES, 0, 3, 1);

    return true;
}
 

import com.jogamp.opengl.GL4; //导入方法依赖的package包/类
@Override
protected boolean render(GL gl) {

    GL4 gl4 = (GL4) gl;

    gl4.glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

    Mat4 projection = glm.perspective_((float) Math.PI * 0.25f, (float) windowSize.x / windowSize.y, 0.1f, 100.0f);
    Mat4 model = new Mat4(1.0f);
    Mat4 mvp = projection.mul(viewMat4()).mul(model);

    gl4.glViewport(0, 0, windowSize.x, windowSize.y);
    gl4.glClearBufferfv(GL_COLOR, 0, clearColor.put(0, 0).put(1, 0).put(2, 0).put(3, 0));

    gl4.glUseProgram(programName);
    gl4.glUniformMatrix4fv(uniformMvp, 1, false, mvp.toFa_(), 0);

    gl4.glBindVertexArray(vertexArrayName.get(0));
    gl4.glPatchParameteri(GL_PATCH_VERTICES, vertexCount);

    gl4.glDrawArraysInstanced(GL_PATCHES, 0, vertexCount, 1);

    return true;
}